{"id":33248,"date":"2025-04-27T02:53:06","date_gmt":"2025-04-26T18:53:06","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/33248.html"},"modified":"2025-04-27T02:53:06","modified_gmt":"2025-04-26T18:53:06","slug":"%e4%b8%80%e5%a4%a9%e5%ad%a6%e5%ae%8cservlet%ef%bc%81%ef%bc%81%ef%bc%81%ef%bc%88%e4%b8%87%e5%ad%97%e6%80%bb%e7%bb%93%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/33248.html","title":{"rendered":"\u4e00\u5929\u5b66\u5b8cServlet\uff01\uff01\uff01\uff08\u4e07\u5b57\u603b\u7ed3\uff09"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>Servlet\u6253\u5370Hello Servlet<\/li>\n<li>Servlet\u751f\u547d\u5468\u671f<\/li>\n<\/ul>\n<\/li>\n<li>HttpServletRequest\u5bf9\u8c61<\/li>\n<li>\n<ul>\n<li>\u5e38\u7528api\u65b9\u6cd5<\/li>\n<li>\u8bf7\u6c42\u4e71\u7801\u95ee\u9898<\/li>\n<li>\u8bf7\u6c42\u8f6c\u53d1<\/li>\n<li>request\u57df\u5bf9\u8c61<\/li>\n<\/ul>\n<\/li>\n<li>HttpServletResponse\u5bf9\u8c61<\/li>\n<li>\n<ul>\n<li>\u54cd\u5e94\u6570\u636e<\/li>\n<li>\u54cd\u5e94\u4e71\u7801\u95ee\u9898<\/li>\n<li>\u8bf7\u6c42\u91cd\u5b9a\u5411<\/li>\n<li>\u8bf7\u6c42\u8f6c\u53d1\u4e0e\u91cd\u5b9a\u5411\u533a\u522b<\/li>\n<\/ul>\n<\/li>\n<li>Cookie\u5bf9\u8c61<\/li>\n<li>\n<ul>\n<li>Cookie\u7684\u521b\u5efa\u4e0e\u83b7\u53d6<\/li>\n<li>Cookie\u8bbe\u7f6e\u5230\u671f\u65f6\u95f4<\/li>\n<li>Cookie\u6ce8\u610f\u70b9<\/li>\n<li>Cookie\u7684\u8def\u5f84<\/li>\n<\/ul>\n<\/li>\n<li>HttpSession\u5bf9\u8c61<\/li>\n<li>\n<ul>\n<li>Session\u5bf9\u8c61\u83b7\u53d6\u548c\u5e38\u7528Api<\/li>\n<li>\u6807\u8bc6\u7b26JSESSIONID<\/li>\n<li>session\u57df\u5bf9\u8c61<\/li>\n<li>session\u5bf9\u8c61\u7684\u9500\u6bc1<\/li>\n<\/ul>\n<\/li>\n<li>ServletContext\u5bf9\u8c61<\/li>\n<li>\n<ul>\n<li>\u5e38\u7528aip<\/li>\n<li>ServletContext\u57df\u5bf9\u8c61<\/li>\n<\/ul>\n<\/li>\n<li>Servlet\u4e09\u5927\u57df\u5bf9\u8c61\u603b\u7ed3<\/li>\n<li>Servlet\u6587\u4ef6\u4e0a\u4f20<\/li>\n<li>\n<ul>\n<li>\u524d\u7aef\u9875\u9762\u5b9e\u73b0<\/li>\n<li>\u540e\u53f0\u4ee3\u7801\u5b9e\u73b0<\/li>\n<\/ul>\n<\/li>\n<li>Servlet\u6587\u4ef6\u4e0b\u8f7d<\/li>\n<li>\n<ul>\n<li>\u8d85\u94fe\u63a5\u4e0b\u8f7d<\/li>\n<li>\u540e\u53f0\u4ee3\u7801\u4e0b\u8f7d<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u524d\u8a00<\/h3>\n<p>\u867d\u7136Servlet\u73b0\u5728\u5df2\u7ecf\u4e0d\u4f1a\u76f4\u63a5\u7528\u4e8e\u5f00\u53d1\u4e86&#xff0c;\u4f46\u662f\u4f5c\u4e3aSpringMVC\u7684\u524d\u7f6e\u77e5\u8bc6&#xff0c;\u8fd8\u662f\u9700\u8981\u5168\u9762\u4e86\u89e3\u4e00\u4e0b\u7684&#xff0c;\u6545\u505a\u6b64\u6587&#xff0c;\u7528\u4e8e\u603b\u7ed3\u3002<\/p>\n<h3>Servlet\u6253\u5370Hello Servlet<\/h3>\n<p>1\u3001\u524d\u7f6e\u914d\u7f6e<\/p>\n<p>\u4e0b\u8f7dTomcat : Tomcat\u4e0b\u8f7d\u8fde\u63a5<\/p>\n<p>idea2022 \u521b\u5efaServlet\u9879\u76ee\u6d41\u7a0b:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185259-680d2b8bd280a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185300-680d2b8cccff5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185302-680d2b8e014bc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Servlet01<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">service<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> resp<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u6253\u5370\u5185\u5bb9\u5728\u63a7\u5236\u53f0<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello servlet&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u901a\u8fc7\u6d41\u8f93\u51fa\u5230\u6d4f\u89c8\u5668<\/span><br \/>\n        resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWriter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello Servlet!!!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u6548\u679c&#xff1a; \u6d4f\u89c8\u5668: <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185302-680d2b8e97478.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u63a7\u5236\u53f0&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185302-680d2b8ed832a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>Servlet\u751f\u547d\u5468\u671f<\/h3>\n<p>\u751f\u547d\u5468\u671f\u7b80\u5355\u6765\u8bf4&#xff0c;\u5206\u4e3a3\u6b65&#xff0c; \u521d\u59cb\u5316(init()) &#061;&#061;&gt; \u8c03\u7528\u65b9\u6cd5(service()) &#061;&#061;&gt;\u9500\u6bc1\u65b9\u6cd5(destroy()) \u653e\u5230\u4ee3\u7801\u4e2d\u6765\u770b&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;WebServlet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/ser02&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> servlet02 <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">SimpleDateFormat<\/span> formatter <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SimpleDateFormat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;yyyy-MM-dd HH:mm:ss&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * \u7cfb\u7edf\u65b9\u6cd5&#xff0c;\u670d\u52a1\u5668\u81ea\u52a8\u8c03\u7528&#xff0c;\u53ea\u6267\u884c\u4e00\u6b21<br \/>\n     * &#064;throws ServletException<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet\u88ab\u521b\u5efa\u4e86&#8230;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> formatter<span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Date<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * \u6bcf\u6b21\u8c03\u7528\u90fd\u4f1a\u6267\u884c<br \/>\n     * &#064;param req<br \/>\n     * &#064;param resp<br \/>\n     * &#064;throws ServletException<br \/>\n     * &#064;throws IOException<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">service<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> resp<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet\u88ab\u8c03\u7528\u4e86&#8230;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> formatter<span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Date<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/**<br \/>\n     * \u7cfb\u7edf\u65b9\u6cd5&#xff0c;\u670d\u52a1\u5668\u81ea\u52a8\u8c03\u7528&#xff0c;\u53ea\u6267\u884c\u4e00\u6b21<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">destroy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet\u88ab\u9500\u6bc1\u4e86&#8230;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> formatter<span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Date<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185303-680d2b8f4b412.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa&#xff0c;\u4e0d\u7ba1\u6d4f\u89c8\u5668\u8bbf\u95ee\u8c03\u7528\u591a\u5c11\u6b21&#xff0c;\u521d\u59cb\u5316\u548c\u9500\u6bc1\u65b9\u6cd5\u53ea\u4f1a\u6267\u884c\u4e00\u6b21&#xff0c;\u4f46\u662fService\u5728\u6bcf\u6b21\u8bbf\u95ee\u90fd\u4f1a\u6267\u884c\u3002<\/p>\n<h2>HttpServletRequest\u5bf9\u8c61<\/h2>\n<p>\u7b80\u5355\u6765\u8bb2&#xff0c;HttpServletRequest\u5c31\u662f\u5c01\u88c5\u7528\u6237\u4f20\u8fc7\u6765\u7684\u8bf7\u6c42\u4fe1\u606f&#xff0c;\u5bf9\u8c61\u7531Tomcat\u5c01\u88c5\u597d\u4f20\u8fc7\u6765&#xff0c;\u540c\u65f6\u8be5\u5bf9\u8c61\u662f\u4e00\u4e2a\u63a5\u53e3\u3002service() \u65b9\u6cd5\u4e2d\u4f20\u9012\u7684HttpServletRequest\u5bf9\u8c61\u662f\u8be5\u63a5\u53e3\u7684\u5b9e\u4f8b\u5316\u5bf9\u8c61\u3002<\/p>\n<h3>\u5e38\u7528api\u65b9\u6cd5<\/h3>\n<p><span class=\"token annotation punctuation\">&#064;WebServlet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/ser01&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Servlet01<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">service<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> resp<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1. \u5b8c\u6574\u7684\u8bf7\u6c42url<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> url <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRequestURL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u83b7\u53d6\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u5b8c\u6574url: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> url<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2. \u90e8\u5206url(\u7ad9\u70b9\u540d\u5f00\u59cb&#xff0c;\u5230&#xff1f;\u524d\u9762\u7ed3\u675f)<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> uri <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRequestURI<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u90e8\u5206url: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> uri<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3. \u83b7\u53d6\u8bf7\u6c42\u884c\u4e2d\u7684\u53c2\u6570\u90e8\u5206<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> queryString <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getQueryString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u83b7\u53d6\u8bf7\u6c42\u884c\u4e2d\u7684\u53c2\u6570\u90e8\u5206: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> queryString<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 4. \u83b7\u53d6\u5ba2\u6237\u7aef\u8bf7\u6c42\u65b9\u5f0f<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> method <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMethod<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u65b9\u5f0f: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 5. \u83b7\u53d6http\u7248\u672c\u53f7<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> protocol <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProtocol<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;http\u7248\u672c\u53f7\u4e3a: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> protocol<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 6. \u83b7\u53d6webapp\u540d\u5b57<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> contextPath <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getContextPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;webapp\u540d\u5b57\u4e3a: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> contextPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 7. \u83b7\u53d6\u8bf7\u6c42\u53c2\u6570<\/span><br \/>\n            <span class=\"token comment\">\/\/ (1)\u3001\u83b7\u53d6\u6307\u5b9a\u540d\u79f0\u53c2\u6570<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> pwd <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pwd&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; pwd: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> pwd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ (2)\u3001\u83b7\u53d6\u6307\u5b9a\u540d\u79f0\u53c2\u6570\u7684\u6240\u6709\u503c<\/span><br \/>\n        <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> hobbys <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameterValues<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hobby&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hobbys: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span>hobbys<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>hobbys <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">&amp;&amp;<\/span> hobbys<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> hobby <span class=\"token operator\">:<\/span> hobbys<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7231\u597d: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> hobby<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bf7\u6c42url:<\/p>\n<p>http:\/\/localhost:8080\/s01\/ser01?username&#061;suxuchao&#038;pwd&#061;123456&#038;hobby&#061;sing&#038;hobby&#061;dance&#038;hobby&#061;computer<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>\u83b7\u53d6\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u5b8c\u6574url: http:\/\/localhost:8080\/s01\/ser01<br \/>\n\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u90e8\u5206url: \/s01\/ser01<br \/>\n\u83b7\u53d6\u8bf7\u6c42\u884c\u4e2d\u7684\u53c2\u6570\u90e8\u5206: username&#061;suxuchao&amp;pwd&#061;123456&amp;hobby&#061;sing&amp;hobby&#061;dance&amp;hobby&#061;computer<br \/>\n\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u65b9\u5f0f: GET<br \/>\nhttp\u7248\u672c\u53f7\u4e3a: HTTP\/1.1<br \/>\nwebapp\u540d\u5b57\u4e3a: \/s01<br \/>\nusername: suxuchao pwd: 123456<br \/>\nhobbys: [sing, dance, computer]<br \/>\n\u7231\u597d: sing<br \/>\n\u7231\u597d: dance<br \/>\n\u7231\u597d: computer<\/p>\n<h3>\u8bf7\u6c42\u4e71\u7801\u95ee\u9898<\/h3>\n<p>\u5728Tomcat8\u4ee5\u4e0a&#xff0c;GET\u8bf7\u6c42\u6709\u4e2d\u6587\u7684\u8bdd\u4e0d\u4f1a\u51fa\u73b0\u4e71\u7801&#xff0c;\u4f46\u662f\u4f7f\u7528POST\u8bf7\u6c42\u5c31\u4f1a\u51fa\u73b0\u4e71\u7801&#xff0c;\u5982\u4e0b&#xff1a;<\/p>\n<p>\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;WebServlet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/ser03&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Servlet03<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">service<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> resp<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u83b7\u53d6\u5ba2\u6237\u7aef\u4f20\u9012\u7684\u53c2\u6570<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> pwd <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pwd&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> method <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMethod<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u6c42\u65b9\u6cd5\u4e3a: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pwd: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> pwd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6d4f\u89c8\u5668\u8f93\u5165&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185303-680d2b8fea3bc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>\u8bf7\u6c42\u65b9\u6cd5\u4e3a: POST<br \/>\nusername: \u00e5\u00bc \u00e4\u00b8\u2030<br \/>\npwd: \u00e5\u00bc \u00e4\u00b8\u2030<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a; \u9996\u5148\u6211\u4eec\u9700\u8981\u77e5\u9053&#xff0c;\u4e71\u7801\u662f\u56e0\u4e3a\u5728\u89e3\u6790\u8fc7\u7a0b\u4e2d&#xff0c;request\u9ed8\u8ba4\u4f7f\u7528\u7684\u7f16\u7801\u662fISO-8859-1 &#xff08;\u6b64\u7f16\u7801\u4e0d\u652f\u6301\u4e2d\u6587&#xff09;&#xff0c;\u6240\u4ee5\u89e3\u6790\u4e00\u5b9a\u4f1a\u6709\u4e71\u7801<\/p>\n<p><span class=\"token comment\">\/\/\u8bbe\u7f6e\u7f16\u7801<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCharacterEncoding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5c06\u8be5\u4ee3\u7801\u653e\u5728\u65b9\u6cd5\u4e00\u5f00\u59cb&#xff0c;\u5373\u53ef\u89e3\u51b3\u4e2d\u6587\u4e71\u7801\u95ee\u9898<\/p>\n<p>\u66f4\u6b63\u540e\u7ed3\u679c&#xff1a;<\/p>\n<p>\u8bf7\u6c42\u65b9\u6cd5\u4e3a: POST<br \/>\nusername: \u5f20\u4e09<br \/>\npwd: \u5f20\u4e09<\/p>\n<h3>\u8bf7\u6c42\u8f6c\u53d1<\/h3>\n<p>\u8bf7\u6c42\u8f6c\u53d1\u6709\u51e0\u4e2a\u7279\u70b9<\/p>\n<li>\u670d\u52a1\u7aef\u884c\u4e3a<\/li>\n<li>\u5730\u5740\u680f\u7684url\u4e0d\u53d1\u751f\u53d8\u5316<\/li>\n<li>\u4ece\u59cb\u81f3\u7ec8\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42<\/li>\n<li>request\u6570\u636e\u53ef\u4ee5\u5171\u4eab<\/li>\n<li>\u4ee3\u7801\u4e2dgetRequestDispatcher\u53ea\u80fd\u8f6c\u53d1\u4e00\u6b21<\/li>\n<p>\u8bf7\u6c42url:<\/p>\n<p>http:\/\/localhost:8080\/s01\/ser03?username&#061;\u5f20\u4e09<\/p>\n<p>Servlet3\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet03: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u8bf7\u6c42\u8f6c\u53d1\u8df3\u8f6c\u5230Servlet04<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRequestDispatcher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ser04&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forward<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">,<\/span> resp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>Servlet4\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u63a5\u6536\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u53c2\u6570<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet04: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c:<\/p>\n<p>Servlet03: \u5f20\u4e09<br \/>\nServlet04: \u5f20\u4e09<\/p>\n<p>\u540c\u65f6&#xff0c;\u91cd\u5b9a\u5411\u53ef\u4ee5\u91cd\u5b9a\u5411.html\/.jsp\u6587\u4ef6\u7b49\u9875\u9762&#xff1a;<\/p>\n<p>req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRequestDispatcher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;login.jsp&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forward<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">,<\/span> resp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>request\u57df\u5bf9\u8c61<\/h3>\n<p>request\u57df\u5bf9\u8c61\u4e2d\u7684\u6570\u636e\u5728\u4e00\u6b21\u8bf7\u6c42\u4e2d\u6709\u6548&#xff0c;\u7ecf\u8fc7\u8bf7\u6c42\u8f6c\u53d1&#xff0c;request\u57df\u4e2d\u7684\u6570\u636e\u4ecd\u7136\u5b58\u5728&#xff0c;\u5728\u8bf7\u6c42\u8f6c\u53d1\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u901a\u8fc7request\u6765\u4f20\u8f93\/\u5171\u4eab\u6570\u636e\u3002<\/p>\n<p>Servlet05\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet05&#8230;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u8bbe\u7f6e\u57df\u5bf9\u8c61\u5185\u5bb9<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;admin&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;age&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;aaa&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bbb&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;list&#034;<\/span><span class=\"token punctuation\">,<\/span> list<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getRequestDispatcher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ser06&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forward<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">,<\/span> resp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>Servlet06\u4ee3\u7801&#xff1a;<\/p>\n<p> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet06&#8230;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u83b7\u53d6\u57df\u5bf9\u8c61\u5185\u5bb9<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">)<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Integer<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">)<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;age&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">)<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;list&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;age: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;list: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">.<\/span><span class=\"token function\">toArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8bf7\u6c42url:<\/p>\n<p>http:\/\/localhost:8080\/s01\/ser05<\/p>\n<p>\u8bbf\u95ee\u7ed3\u679c:<\/p>\n<p>Servlet05&#8230;<br \/>\nServlet06&#8230;<br \/>\nname: admin<br \/>\nage: 18<br \/>\nlist: [aaa, bbb]<\/p>\n<h2>HttpServletResponse\u5bf9\u8c61<\/h2>\n<p>\u7b80\u5355\u6765\u8bb2&#xff0c;HttpServletResponse\u5c31\u662f\u5c01\u88c5\u670d\u52a1\u5668\u5904\u7406\u540e&#xff0c;\u8981\u54cd\u5e94\u7ed9\u5ba2\u6237\u7aef\u7684\u6570\u636e&#xff0c;\u5c01\u88c5\u7684\u6570\u636e\u6709 (\u53d1\u9001\u6570\u636e&#xff0c;\u53d1\u9001\u54cd\u5e94\u5934&#xff0c;\u53d1\u9001\u54cd\u5e94\u72b6\u6001\u7801) \u7684\u65b9\u6cd5\u3002service() \u65b9\u6cd5\u4e2d\u4f20\u9012\u7684HttpServletResponse\u5bf9\u8c61\u662f\u8be5\u63a5\u53e3\u7684\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/p>\n<h3>\u54cd\u5e94\u6570\u636e<\/h3>\n<p>\u4f7f\u7528\u5b57\u7b26\u6d41&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6\u5b57\u7b26\u8f93\u51fa\u6d41<\/span><br \/>\n<span class=\"token class-name\">PrintWriter<\/span> writer <span class=\"token operator\">&#061;<\/span> resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWriter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa\u6570\u636e<\/span><br \/>\nwriter<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f7f\u7528\u5b57\u8282\u6d41:<\/p>\n<p><span class=\"token comment\">\/\/\u5b57\u8282\u8f93\u51fa\u6d41<\/span><br \/>\n    <span class=\"token class-name\">ServletOutputStream<\/span> outputStream <span class=\"token operator\">&#061;<\/span> resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    outputStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hi&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a; \u4e24\u4e2a\u6d41\u53ea\u80fd\u9009\u62e9\u4e00\u4e2a\u6765\u7528&#xff0c;\u5426\u5219\u5c31\u4f1a\u62a5\u9519\u3002<\/p>\n<h3>\u54cd\u5e94\u4e71\u7801\u95ee\u9898<\/h3>\n<p>s02\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token class-name\">PrintWriter<\/span> writer <span class=\"token operator\">&#061;<\/span> resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWriter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    writer<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&lt;h2&gt;\u4f60\u597d&lt;\/h2&gt;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>s03\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token class-name\">ServletOutputStream<\/span> os <span class=\"token operator\">&#061;<\/span> resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    os<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&lt;h2&gt;\u4f60\u597d&lt;\/h2&gt;&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>&lt;h2&gt;??&lt;\/h2&gt;<br \/>\n&lt;h2&gt;\u6d63\u72b2\u30bd&lt;\/h2&gt;<\/p>\n<p>\u89e3\u51b3\u65b9\u5f0f&#xff1a; \u5728\u4ee3\u7801\u6700\u5f00\u5934\u6dfb\u52a0\u4e00\u884c\u8fd9\u4e2a\u4ee3\u7801&#xff0c;\u7c7b\u6bd4request\u7684\u89e3\u51b3\u65b9\u6cd5<\/p>\n<p>resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCharacterEncoding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f46\u662f\u6211\u4eec\u53d1\u73b0\u6b64\u65f6\u4e24\u79cd\u8f93\u51fa\u6d41\u6253\u5370\u7684\u7ed3\u679c\u6700\u540e\u90fd\u53d8\u6210\u4e86\u76f8\u540c\u7684\u4e71\u7801&#xff0c;\u5982\u4e0b&#xff1a;<\/p>\n<p>&lt;h2&gt;\u6d63\u72b2\u30bd&lt;\/h2&gt;<\/p>\n<p>\u8fd9\u662f\u56e0\u4e3a\u6211\u4eec\u53ea\u8bbe\u7f6e\u4e86\u670d\u52a1\u7aef\u7684\u7f16\u7801&#xff0c;request\u8bf7\u6c42\u6570\u636e\u53ea\u5728\u670d\u52a1\u7aef\u4e4b\u95f4\u4f20\u9012&#xff0c;\u56e0\u6b64\u8fd9\u6837\u8bbe\u7f6e\u53ef\u4ee5\u89e3\u51b3\u95ee\u9898&#xff0c;\u4f46\u662fresponse\u683c\u5f0f\u7684\u8bdd&#xff0c;\u6211\u4eec\u4e0d\u4f46\u8981\u8bbe\u7f6e\u670d\u52a1\u7aef&#xff0c;\u8fd8\u6709\u8bbe\u7f6e\u5ba2\u6237\u7aef\u7684\u7f16\u7801&#xff0c;\u89e3\u51b3\u65b9\u6cd5\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u670d\u52a1\u7aef\u7684\u7f16\u7801<\/span><br \/>\n    resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCharacterEncoding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5ba2\u6237\u7aef\u7684\u7f16\u7801<\/span><br \/>\n    resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setHeader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;content-type&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6216\u8005\u66f4\u7b80\u5355\u7684\u89e3\u51b3\u65b9\u6cd5<\/p>\n<p><span class=\"token comment\">\/\/\u540c\u65f6\u8bbe\u7f6e\u7f16\u7801<\/span><br \/>\n    resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setContentType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u6837\u5c31\u53ef\u4ee5\u89e3\u51b3\u4e71\u7801\u548c\u65e0\u6cd5\u8bc6\u522bhtml\u7684\u95ee\u9898\u4e86\u3002<\/p>\n<h3>\u8bf7\u6c42\u91cd\u5b9a\u5411<\/h3>\n<li>\u91cd\u5b9a\u5411\u662f\u5ba2\u6237\u7aef\u884c\u4e3a&#xff0c;\u7531\u670d\u52a1\u7aef\u6307\u5bfc<\/li>\n<li>\u5730\u5740\u680furl\u4f1a\u53d1\u751f\u6539\u53d8<\/li>\n<li>\u5b58\u5728\u4e24\u6b21\u8bf7\u6c42<\/li>\n<li>\u4e24\u6b21\u8bf7\u6c42\u7684\u6570\u636e\u4e0d\u5171\u4eab<\/li>\n<p>Servlet04\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet04&#8230;.&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setContentType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">sendRedirect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;s05&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>Servlet05\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Servlet05&#8230;.&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setContentType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7b2c\u4e00\u6b21\u8bf7\u6c42url&#xff1a;<\/p>\n<p>http:\/\/localhost:8080\/s01\/s04?username&#061;zhangsan<\/p>\n<p>\u91cd\u5b9a\u5411\u540e\u7684url:<\/p>\n<p>http:\/\/localhost:8080\/s01\/s05<\/p>\n<p>\u6253\u5370\u7ed3\u679c&#xff1a;<\/p>\n<p>Servlet04&#8230;.<br \/>\nusername: zhangsan<br \/>\nServlet05&#8230;.<br \/>\nusername: null<\/p>\n<h3>\u8bf7\u6c42\u8f6c\u53d1\u4e0e\u91cd\u5b9a\u5411\u533a\u522b<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185304-680d2b90278bd.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>Cookie\u5bf9\u8c61<\/h2>\n<p>Cookie\u5c31\u662f\u901a\u8fc7\u6d4f\u89c8\u5668\u7684\u4e00\u4e9b\u7a0b\u5e8f&#xff0c;\u5c06\u53ea\u5728\u5ba2\u6237\u7aef\u8fdb\u884c\u64cd\u4f5c\u7684\u6570\u636e&#xff0c;\u5b58\u5728cookie\u4e2d&#xff0c;\u4ee5\u6b64\u6765\u51cf\u8f7b\u670d\u52a1\u5668\u7684\u538b\u529b&#xff0c;\u4f8b\u5982&#xff1a;\u8bb0\u4f4f\u5bc6\u7801\u7684\u64cd\u4f5c\u3002 cookie\u5c31\u662f\u7b80\u5355\u7684\u952e\u503c\u5bf9\u5f62\u5f0f\u5b58\u50a8&#xff0c;key\u548cvalue\u4e4b\u95f4\u7528&#034;&#061;&#034;\u8fde\u63a5&#xff0c;\u4e0d\u540ckv\u4e4b\u95f4\u7528\u201c;\u201d \u6765\u5206\u5272\u3002<\/p>\n<h3>Cookie\u7684\u521b\u5efa\u4e0e\u83b7\u53d6<\/h3>\n<p>\u521b\u5efaCookie\u5bf9\u8c61<\/p>\n<p><span class=\"token comment\">\/\/ Cookie\u7684\u521b\u5efa<\/span><br \/>\n    <span class=\"token class-name\">Cookie<\/span> cookie <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token comment\">\/\/ \u53d1\u9001(\u54cd\u5e94)Cookie\u5bf9\u8c61<\/span><br \/>\n     resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">addCookie<\/span><span class=\"token punctuation\">(<\/span>cookie<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185304-680d2b90b9266.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u83b7\u53d6Cookie\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6Cookie\u6570\u7ec4<\/span><br \/>\n    <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> cookies <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCookies<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5224\u65adCookie\u662f\u5426\u4e3a\u7a7a<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cookies <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">&amp;&amp;<\/span> cookies<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Cookie<\/span> cookie <span class=\"token operator\">:<\/span> cookies<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> cookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">String<\/span> value <span class=\"token operator\">&#061;<\/span> cookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;value: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>name: username<br \/>\nvalue: zhangsan<\/p>\n<h3>Cookie\u8bbe\u7f6e\u5230\u671f\u65f6\u95f4<\/h3>\n<p>\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5230\u671f\u65f6\u95f4\u4e3a\u8d1f\u6570&#xff08;\u6d4f\u89c8\u5668\u5173\u95ed\u5c31\u5931\u6548&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">Cookie<\/span> cookie1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username01&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cookie1<span class=\"token punctuation\">.<\/span><span class=\"token function\">setMaxAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    res<span class=\"token punctuation\">.<\/span><span class=\"token function\">addCookie<\/span><span class=\"token punctuation\">(<\/span>cookie1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5230\u671f\u65f6\u95f4\u4e3a\u6574\u6570&#xff08;cookie\u5b58\u5728\u6307\u5b9a\u65f6\u95f4&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">Cookie<\/span> cookie2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username02&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;lisi&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cookie2<span class=\"token punctuation\">.<\/span><span class=\"token function\">setMaxAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">30<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    res<span class=\"token punctuation\">.<\/span><span class=\"token function\">addCookie<\/span><span class=\"token punctuation\">(<\/span>cookie2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5230\u671f\u65f6\u95f4\u4e3a0&#xff08;\u5220\u9664cookie&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">Cookie<\/span> cookie3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username03&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;wangwu1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    cookie3<span class=\"token punctuation\">.<\/span><span class=\"token function\">setMaxAge<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    res<span class=\"token punctuation\">.<\/span><span class=\"token function\">addCookie<\/span><span class=\"token punctuation\">(<\/span>cookie3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>Cookie\u6ce8\u610f\u70b9<\/h3>\n<li>\n<p>Cookie\u53ea\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u6709\u7528&#xff0c;Cookie\u65e0\u6cd5\u8de8\u6d4f\u89c8\u5668,\u4e14\u53ea\u4fdd\u5b58\u5728\u5f53\u524d\u7535\u8111<\/p>\n<\/li>\n<li>\n<p>Cookie\u5b58\u4e2d\u6587\u95ee\u9898<\/p>\n<\/li>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528URLEncoder\u8fdb\u884c\u7f16\u7801<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u59d3\u540d&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> value <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        name <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">URLEncoder<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">encode<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        value <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">URLEncoder<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">encode<\/span><span class=\"token punctuation\">(<\/span>value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u521b\u5efaCookie\u5bf9\u8c61<\/span><br \/>\n        <span class=\"token class-name\">Cookie<\/span> cookie1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">addCookie<\/span><span class=\"token punctuation\">(<\/span>cookie1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u83b7\u53d6Cookie<\/span><br \/>\n        <span class=\"token class-name\">Cookie<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> cookies <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCookies<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cookies <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">&amp;&amp;<\/span> cookies<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Cookie<\/span> cookie <span class=\"token operator\">:<\/span> cookies<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> dname <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">URLDecoder<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">decode<\/span><span class=\"token punctuation\">(<\/span>cookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">String<\/span> dvalue <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">URLDecoder<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">decode<\/span><span class=\"token punctuation\">(<\/span>cookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">getValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;dname: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> dname<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;dvalue: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> dvalue<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b58\u50a8\u6548\u679c&#xff1a;<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185305-680d2b9110f5f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<li>\u540c\u540dCookie\u95ee\u9898<\/li>\n<p>\u5982\u679c\u670d\u52a1\u7aef\u53d1\u9001\u91cd\u590d\u7684Cookie&#xff0c;\u90a3\u4e48\u4f1a\u8986\u76d6\u539f\u6709\u7684Cookie.<\/p>\n<li>\u6d4f\u89c8\u5668\u5b58\u653eCookie\u7684\u6570\u91cf<\/li>\n<p>\u6d4f\u89c8\u5668\u5bf9\u4e8eCookie\u7684\u5b58\u653e\u6570\u91cf\u4e5f\u662f\u6709\u4e0a\u9650\u7684&#xff0c;Cookie\u5b58\u653e\u5728\u6d4f\u89c8\u5668&#xff0c;\u800c\u4e14\u4e00\u822c\u7531\u670d\u52a1\u7aef\u521b\u5efa\u548c\u8bbe\u5b9a&#xff0c;\u540e\u671f\u7ed3\u5408Session\u6765\u8fdb\u884c\u4f1a\u8bdd\u8ffd\u8e2a\u3002<\/p>\n<h3>Cookie\u7684\u8def\u5f84<\/h3>\n<p>\u7b80\u5355\u603b\u7ed3&#xff0c;\u5982\u679c\u8bbf\u95ee\u8def\u5f84\u4e2d\u5e26\u4e0a\u4e86Cookie\u8bbe\u7f6e\u7684\u8def\u5f84&#xff0c;\u5c31\u53ef\u4ee5\u8bbf\u95ee\u5230Cookie,\u5426\u5219\u5c31\u8bbf\u95ee\u4e0d\u5230\u3002<\/p>\n<p>http:\/\/localhost:8080\/s01\/cookie01<\/p>\n<p>\u5bf9\u4e8e\u4e0a\u8ff0url&#xff0c; \u5982\u679cCookie\u8bbe\u7f6e\u5982\u4e0b\u5c31\u53ef\u4ee5\u8bbf\u95ee\u5230<\/p>\n<p>cookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ncookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/s01&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ncookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/s01\/cookie01&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5982\u679c\u8bbe\u7f6e\u5982\u4e0b\u5c31\u8bbf\u95ee\u4e0d\u5230<\/p>\n<p>cookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/s02&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ncookie<span class=\"token punctuation\">.<\/span><span class=\"token function\">setPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/s01\/cookie02&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>HttpSession\u5bf9\u8c61<\/h2>\n<li>Session \u6570\u636e\u672c\u8eab\u53ea\u5b58\u50a8\u5728\u670d\u52a1\u7aef<\/li>\n<li>\u5ba2\u6237\u7aef\u4ec5\u6301\u6709\u7528\u4e8e\u67e5\u627e Session \u7684 ID&#xff08;\u76f8\u5f53\u4e8e\u94a5\u5319&#xff09;<\/li>\n<li>\u82e5\u5ba2\u6237\u7aef\u7981\u7528 Cookie&#xff0c;\u9700\u901a\u8fc7 URL \u53c2\u6570\u4f20\u9012 Session ID<\/li>\n<li>\u6bcf\u4e00\u4e2aSession\u53ea\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u4fdd\u5b58&#xff0c;\u5f00\u65b0\u6d4f\u89c8\u5668\u5c31\u65e0\u6cd5\u83b7\u5f97\u5f53\u524dSession<\/li>\n<h3>Session\u5bf9\u8c61\u83b7\u53d6\u548c\u5e38\u7528Api<\/h3>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6Session\u5bf9\u8c61<\/span><br \/>\n    <span class=\"token class-name\">HttpSession<\/span> session <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSession<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6Session\u7684\u4f1a\u8bdd\u6807\u8bc6\u7b26<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> id <span class=\"token operator\">&#061;<\/span> session<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6Session\u7684\u521b\u5efa\u65f6\u95f4<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>session<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCreationTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6\u6700\u540e\u4e00\u6b21\u8bbf\u95ee\u65f6\u95f4<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>session<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLastAccessedTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5224\u65ad\u662f\u5426\u662f\u65b0\u7684Session\u5bf9\u8c61<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>session<span class=\"token punctuation\">.<\/span><span class=\"token function\">isNew<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c:<\/p>\n<p>A07655B90CBD6033B4D2F4FCC3C5FBE3<br \/>\n1745488955622<br \/>\n1745488955622<br \/>\ntrue<\/p>\n<h3>\u6807\u8bc6\u7b26JSESSIONID<\/h3>\n<p>\u670d\u52a1\u5668\u6bcf\u6b21\u4f1a\u5148\u68c0\u67e5\u4ece\u5ba2\u6237\u7aef\u4f20\u8fc7\u6765\u6570\u636e\u4e2d\u6709\u6ca1\u6709JSESSIONID\u6807\u8bc6\u7b26&#xff0c;\u8be5\u6807\u8bc6\u7b26\u5b58\u653e\u4e8ecookie&#xff0c;\u670d\u52a1\u5668\u6536\u5230JSESSIONID\u4e4b\u540e\u4f1a\u5148\u67e5\u770b\u662f\u5426\u542b\u6709\u8be5\u503c\u7684Session\u5bf9\u8c61&#xff0c;\u5982\u679c\u6ca1\u6709&#xff0c;\u5219\u8ba4\u4e3a\u8fd9\u662f\u4e00\u6b21\u65b0\u5bf9\u8bdd&#xff0c;\u521b\u5efa\u4e00\u4e2a\u65b0Session\u5bf9\u8c61&#xff0c;\u5982\u679c\u7531&#xff0c;\u5c31\u8ba4\u4e3a\u662f\u6807\u5fd7\u8fc7\u7684\u4f1a\u8bdd&#xff0c;\u8fd4\u56de\u8be5Session\u5bf9\u8c61&#xff0c;\u5b9e\u73b0\u6570\u636e\u5171\u4eab\u3002<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250426185305-680d2b913a4b3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>session\u57df\u5bf9\u8c61<\/h3>\n<p>\u6574\u4f53\u4e0erequest\u7684\u57df\u5bf9\u8c61\u7684api\u662f\u4e00\u6837\u7684&#xff0c;\u4f46\u662f\u4e0erequest\u57df\u5bf9\u8c61\u7684\u533a\u522b\u662f&#xff0c;Session\u57df\u5bf9\u8c61\u53ea\u8981\u4f60\u8fd9\u6b21\u4f1a\u8bdd\u6ca1\u6709\u7ed3\u675f&#xff0c;\u5373\u6d4f\u89c8\u5668\u6ca1\u6709\u548c\u670d\u52a1\u5668\u65ad\u5f00&#xff0c;\u65e0\u8bba\u5f00\u591a\u5c11\u4e2a\u9875\u9762\u90fd\u80fd\u8bbf\u95ee\u5230Session\u4e2d\u7684\u6570\u636e&#xff0c;request\u5219\u662f\u53ea\u8981\u6362\u4e86\u4e00\u6b21\u8bf7\u6c42&#xff0c;\u5c31\u65e0\u6cd5\u5171\u4eab\u57df\u5bf9\u8c61\u6570\u636e\u3002<\/p>\n<p>        <span class=\"token comment\">\/\/ \u83b7\u53d6Session\u57df\u5bf9\u8c61<\/span><br \/>\n        <span class=\"token class-name\">HttpSession<\/span> session <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSession<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u57df\u5bf9\u8c61<\/span><br \/>\n        session<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        session<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pwd&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;123456&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u79fb\u9664\u57df\u5bf9\u8c61<\/span><br \/>\n        session<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;pwd&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/\u83b7\u53d6\u57df\u5bf9\u8c61<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">)<\/span> session<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>session\u5bf9\u8c61\u7684\u9500\u6bc1<\/h3>\n<li>\u9ed8\u8ba4\u9500\u6bc1\u65f6\u95f4 Tomcat\/config\/web.xml&#xff0c;\u5728\u8be5\u6587\u4ef6\u4e0b&#xff0c;\u9ed8\u8ba4session\u5728\u4e0d\u64cd\u4f5c\u7684\u60c5\u51b5\u4e0b&#xff0c;\u5b58\u6d3b\u65f6\u95f4\u4e3a30min\u3002<\/li>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>session-config<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>session-timeout<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>30<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>session-timeout<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>session-config<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<li>\u81ea\u5df1\u8bbe\u5b9a\u9500\u6bc1\u65f6\u95f4<\/li>\n<p><span class=\"token class-name\">HttpSession<\/span> session <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSession<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    session<span class=\"token punctuation\">.<\/span><span class=\"token function\">setMaxInactiveInterval<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 15\u79d2\u8fc7\u671f<\/span><\/p>\n<li>\u7acb\u5373\u9500\u6bc1<\/li>\n<p>        session<span class=\"token punctuation\">.<\/span><span class=\"token function\">invalidate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u7acb\u5373\u9500\u6bc1<\/span><\/p>\n<li>\u5173\u95ed\u6d4f\u89c8\u5668\u5931\u6548<\/li>\n<p>Session \u5e95\u5c42\u4f9d\u8d56Cookie\u6765\u5b9e\u73b0&#xff0c;\u800cCookie\u5b58\u5728\u6d4f\u89c8\u5668\u5185\u5b58\u4e2d&#xff0c;\u56e0\u6b64\u5173\u95ed\u6d4f\u89c8\u5668\u5bfc\u81f4Cookie\u5931\u6548&#xff0c;\u4e5f\u4f1a\u5bfc\u81f4Session\u5931\u6548\u3002<\/p>\n<h2>ServletContext\u5bf9\u8c61<\/h2>\n<li>\u6bcf\u4e2aweb\u7a0b\u5e8f&#xff0c;\u6709\u4e14\u4ec5\u6709\u4e00\u4e2aServlet Context\u5bf9\u8c61&#xff0c;\u53c8\u79f0Application\u5bf9\u8c61&#xff0c;\u5728WEB\u7a0b\u5e8f\u542f\u52a8\u540e&#xff0c;\u4e00\u822c\u4f1a\u521b\u5efa\u4e00\u4e2a\u5bf9\u5e94\u7684ServletContext\u5bf9\u8c61\u3002<\/li>\n<li>\u5bf9\u8c61\u4e2d\u4fdd\u5b58\u4e86\u5f53\u524d\u670d\u52a1\u5668\u7684\u4fe1\u606f\u8fd8\u6709getRealPath\u83b7\u53d6\u8d44\u6e90\u771f\u5b9e\u8def\u5f84\u7b49\u3002<\/li>\n<h3>\u5e38\u7528aip<\/h3>\n<p>\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6servletContext\u5bf9\u8c61<\/span><br \/>\n<span class=\"token comment\">\/\/ (1)\u3001\u901a\u8fc7request\u5bf9\u8c61\u83b7\u53d6<\/span><br \/>\n<span class=\"token class-name\">ServletContext<\/span> servletContext1 <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ (2)\u3001\u901a\u8fc7Session\u5bf9\u8c61\u83b7\u53d6<\/span><br \/>\n<span class=\"token class-name\">ServletContext<\/span> servletContext2 <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSession<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ (3)\u3001\u901a\u8fc7ServletConfig\u5bf9\u8c61\u83b7\u53d6<\/span><br \/>\n<span class=\"token class-name\">ServletConfig<\/span> servletConfig <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getServletConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">ServletContext<\/span> servletContext3 <span class=\"token operator\">&#061;<\/span> servletConfig<span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ (4)\u3001\u76f4\u63a5\u83b7\u53d6<\/span><br \/>\n<span class=\"token class-name\">ServletContext<\/span> servletContext4 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/\u5e38\u7528\u65b9\u6cd5<\/span><br \/>\n<span class=\"token comment\">\/\/1. \u83b7\u53d6\u5f53\u524d\u670d\u52a1\u5668\u7684\u7248\u672c\u4fe1\u606f<\/span><br \/>\n<span class=\"token class-name\">String<\/span> serverInfo <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getServerInfo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u83b7\u53d6\u5f53\u524d\u670d\u52a1\u5668\u7684\u7248\u672c\u4fe1\u606f: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> serverInfo<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/2. \u83b7\u53d6\u5f53\u524d\u9879\u76ee\u771f\u5b9e\u8def\u5f84<\/span><br \/>\n<span class=\"token class-name\">String<\/span> realPath <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getRealPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; \u83b7\u53d6\u5f53\u524d\u670d\u52a1\u5668\u7684\u771f\u5b9e\u8def\u5f84: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> realPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>\u83b7\u53d6\u5f53\u524d\u670d\u52a1\u5668\u7684\u7248\u672c\u4fe1\u606f: Apache Tomcat\/8.5.47<br \/>\n\u83b7\u53d6\u5f53\u524d\u670d\u52a1\u5668\u7684\u771f\u5b9e\u8def\u5f84: D:\\\\code_study\\\\servlet01\\\\target\\\\servlet01-1.0-SNAPSHOT\\\\<\/p>\n<h3>ServletContext\u57df\u5bf9\u8c61<\/h3>\n<p>\u8be5\u57df\u5bf9\u8c61\u6570\u636e\u4e0d\u5efa\u8bae\u5b58\u8fc7\u591a\u6570\u636e&#xff0c;\u56e0\u4e3a\u5982\u679c\u4e0d\u624b\u52a8\u79fb\u9664&#xff0c;\u670d\u52a1\u5668\u542f\u52a8\u540e\u4f1a\u4e00\u76f4\u5b58\u5728\u3002<\/p>\n<p><span class=\"token class-name\">ServletContext<\/span> servletContext <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8bbe\u7f6e\u57df\u5bf9\u8c61<\/span><br \/>\nservletContext<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u83b7\u53d6\u57df\u5bf9\u8c61<\/span><br \/>\n<span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">)<\/span> servletContext<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u79fb\u9664\u57df\u5bf9\u8c61<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name &#061; &#034;<\/span> <span class=\"token operator\">&#043;<\/span> name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nservletContext<span class=\"token punctuation\">.<\/span><span class=\"token function\">removeAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h2>Servlet\u4e09\u5927\u57df\u5bf9\u8c61\u603b\u7ed3<\/h2>\n<li>request\u57df\u5bf9\u8c61 \u5728\u4e00\u6b21request\u8bf7\u6c42\u4e2d\u751f\u6548\u3002<\/li>\n<li>Session\u57df\u5bf9\u8c61 \u5728\u4e00\u6b21\u4f1a\u8bdd\u4e2d\u751f\u6548\u3002<\/li>\n<li>ServletContext\u57df\u5bf9\u8c61 \u5728\u670d\u52a1\u5668\u542f\u52a8\u671f\u95f4\u4e00\u76f4\u751f\u6548&#xff0c;\u9664\u975e\u91cd\u542f\u670d\u52a1\u5668\u3002<\/li>\n<h2>Servlet\u6587\u4ef6\u4e0a\u4f20<\/h2>\n<h3>\u524d\u7aef\u9875\u9762\u5b9e\u73b0<\/h3>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span>DOCTYPE html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html lang<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;en&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>meta charset<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u4ef6\u4e0a\u4f20<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>title<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span><br \/>\n      \u6587\u4ef6\u4e0a\u4f20<br \/>\n        <span class=\"token number\">1.<\/span>\u51c6\u5907\u8868\u5355<br \/>\n        <span class=\"token number\">2.<\/span>\u8bbe\u7f6e\u8868\u5355\u7684\u63d0\u4ea4\u7c7b\u578b<br \/>\n        <span class=\"token number\">3.<\/span>\u8bbe\u7f6e\u8868\u5355\u7c7b\u578b\u95ee\u6587\u4ef6\u4e0a\u4f20\u8868\u5355 enctype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;multipart\/form-data&#034;<\/span><br \/>\n        <span class=\"token number\">4.<\/span>\u8bbe\u7f6e\u6587\u4ef6\u63d0\u4ea4\u7684\u5730\u5740<br \/>\n        <span class=\"token number\">5.<\/span>\u51c6\u5907\u8868\u5355\u5143\u7d20<br \/>\n          <span class=\"token number\">1.<\/span> \u666e\u901a\u7684\u8868\u5355\u9879 type<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text&#034;<\/span><br \/>\n          <span class=\"token number\">2.<\/span> \u6587\u4ef6\u9879 type<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;file&#034;<\/span><br \/>\n<span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>form method<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;post&#034;<\/span> enctype<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;multipart\/form-data&#034;<\/span> action<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;uploadServlet&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  \u59d3\u540d<span class=\"token operator\">:<\/span> <span class=\"token operator\">&lt;<\/span>input type<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text&#034;<\/span> name<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>br<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  \u6587\u4ef6<span class=\"token operator\">:<\/span> <span class=\"token operator\">&lt;<\/span>input type<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;file&#034;<\/span> name<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;myfile&#034;<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>br<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>button<span class=\"token punctuation\">&gt;<\/span><\/span>\u63d0\u4ea4<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>button<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>form<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>html<span class=\"token operator\">&gt;<\/span><\/p>\n<h3>\u540e\u53f0\u4ee3\u7801\u5b9e\u73b0<\/h3>\n<p><span class=\"token annotation punctuation\">&#064;WebServlet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/uploadServlet&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;MultipartConfig<\/span> <span class=\"token comment\">\/\/\u6587\u4ef6\u4e0a\u4f20\u8868\u5355\u4e00\u5b9a\u8981\u52a0\u8fd9\u4e2a\u6ce8\u91ca<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> uploadServlet <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">service<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> resp<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6587\u4ef6\u4e0a\u4f20&#8230;.&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u8bf7\u6c42\u7f16\u7801\u683c\u5f0f<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCharacterEncoding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u83b7\u53d6\u666e\u901a\u8868\u5355\u9879<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> username <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;username: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> username<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u83b7\u53d6Part\u5bf9\u8c61&#xff08;Serlet\u5c06mutipart\/form-data\u7684POST\u8bf7\u6c42\u5c01\u88c5\u6210Part\u5bf9\u8c61&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Part<\/span> part <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPart<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfile&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u901a\u8fc7part\u5bf9\u8c61\u5f97\u5230\u4e0a\u4f20\u7684\u6587\u4ef6\u540d<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> fileName <span class=\"token operator\">&#061;<\/span> part<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSubmittedFileName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e0a\u4f20\u6587\u4ef6\u540d: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> fileName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">String<\/span> realPath <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getServletContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getRealPath<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6587\u4ef6\u5b58\u653e\u8def\u5f84: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> realPath<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4e0a\u4f20\u6587\u4ef6\u5230\u6307\u5b9a\u76ee\u5f55<\/span><br \/>\n        part<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>realPath <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\/&#034;<\/span> <span class=\"token operator\">&#043;<\/span> fileName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6700\u540e\u6587\u4ef6\u4e0a\u4f20\u7684\u8def\u5f84\u53ef\u4ee5\u6539\u6210\u4f60\u60f3\u8981\u6307\u5b9a\u7684\u3002 \u6ce8\u610f&#xff1a;\u4e0a\u4f20\u6587\u4ef6\u4e00\u5b9a\u8981\u52a0&#064;MultipartConfig \u6ce8\u89e3&#xff0c;\u5426\u5219\u6587\u4ef6\u65e0\u6cd5\u4e0a\u4f20\u6210\u529f<\/p>\n<h2>Servlet\u6587\u4ef6\u4e0b\u8f7d<\/h2>\n<p>\u5c31\u662f\u5c06\u6d4f\u89c8\u5668\u4e0a\u7684\u6587\u4ef6\u4e0b\u8f7d\u5230\u672c\u5730<\/p>\n<h3>\u8d85\u94fe\u63a5\u4e0b\u8f7d<\/h3>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span>DOCTYPE html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html lang<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;en&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>head<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token operator\">&lt;<\/span>meta charset<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n    <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>title<span class=\"token punctuation\">&gt;<\/span><\/span>\u6587\u4ef6\u4e0b\u8f7d<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>title<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>body<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span><br \/>\n     \u6d4f\u89c8\u5668\u53ef\u8bc6\u522b\u7684\u6587\u4ef6\u53ef\u4ee5\u76f4\u63a5\u6d4f\u89c8\u5668\u4e2d\u67e5\u770b&#xff0c;<br \/>\n          \u4e0d\u53ef\u8bc6\u522b\u7684\u6587\u4ef6\u9700\u8981\u5148\u6d4f\u89c8\u5668\u4e0b\u8f7d\u3002<br \/>\n <span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span>\u6d4f\u89c8\u5668\u53ef\u4ee5\u8bc6\u522b\u7684\u8d44\u6e90<span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>a href<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;download\/hello.txt&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u6587\u672c\u6587\u4ef6<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>a<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>a href<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;download\/ai.jpg&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u56fe\u7247\u6587\u4ef6<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>a<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span>\u6d4f\u89c8\u5668\u4e0d\u53ef\u4ee5\u8bc6\u522b\u7684\u8d44\u6e90<span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>a href<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;download\/yasuo.zip&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u538b\u7f29\u6587\u4ef6<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>a<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span>hr<span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">!<\/span><span class=\"token operator\">&#8212;<\/span>\u6dfb\u52a0\u4e86download\u5c5e\u6027&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u5728\u6d4f\u89c8\u5668\u4e2d\u4e0b\u8f7d\u5bf9\u5e94\u6587\u4ef6<span class=\"token operator\">&#8212;<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>a href<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;download\/hello.txt&#034;<\/span> download<span class=\"token operator\">&gt;<\/span>\u6587\u672c\u6587\u4ef6<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>a<span class=\"token operator\">&gt;<\/span><br \/>\n  <span class=\"token operator\">&lt;<\/span>a href<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;download\/ai.jpg&#034;<\/span> download<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;ai.jpg&#034;<\/span><span class=\"token operator\">&gt;<\/span>\u56fe\u7247\u6587\u4ef6<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>a<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>html<span class=\"token operator\">&gt;<\/span><\/p>\n<h3>\u540e\u53f0\u4ee3\u7801\u4e0b\u8f7d<\/h3>\n<p><span class=\"token annotation punctuation\">&#064;WebServlet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/downloadServlet&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DownloadServlet<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpServlet<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">service<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> req<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpServletResponse<\/span> resp<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">ServletException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6587\u4ef6\u4e0b\u8f7d\u5f00\u59cb&#8230;.&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1. \u8bbe\u7f6e\u8bf7\u6c42\u7684\u7f16\u7801<\/span><br \/>\n        req<span class=\"token punctuation\">.<\/span><span class=\"token function\">setCharacterEncoding<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;UTF-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 2. \u83b7\u53d6\u53c2\u6570<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> fileName <span class=\"token operator\">&#061;<\/span> req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fileName&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3. \u53c2\u6570\u7684\u975e\u7a7a\u5224\u65ad<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fileName <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">||<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>fileName<span class=\"token punctuation\">.<\/span><span class=\"token function\">trim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setContentType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;text\/html;charset&#061;utf-8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getWriter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span 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punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5224\u65ad\u6587\u4ef6\u5bf9\u8c61\u662f\u5426\u5b58\u5728<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>file<span class=\"token punctuation\">.<\/span><span class=\"token function\">exists<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> file<span class=\"token punctuation\">.<\/span><span class=\"token function\">isFile<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u76f8\u5e94\u7c7b\u578b(\u6d4f\u89c8\u5668\u65e0\u6cd5\u5904\u7406\u6216\u6fc0\u6d3b\u67d0\u4e2a\u7a0b\u5e8f\u6765\u5904\u7406\u7684MIME\u7c7b\u578b)<\/span><br \/>\n            resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setContentType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;application\/x-msdownload&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u54cd\u5e94\u5934<\/span><br \/>\n            resp<span class=\"token punctuation\">.<\/span><span class=\"token function\">setHeader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;content-Disposition&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;attachment;filename&#034;<\/span> <span class=\"token operator\">&#043;<\/span> fileName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5f97\u5230file\u6587\u4ef6\u8f93\u5165\u6d41<\/span><br \/>\n            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punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> bytes <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/\u5b9a\u4e49\u957f\u5ea6<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5faa\u73af\u8f93\u51fa<\/span><br \/>\n            <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;<\/span> is<span class=\"token punctuation\">.<\/span><span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u8f93\u51fa<\/span><br \/>\n                os<span class=\"token punctuation\">.<\/span><span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>bytes<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token comment\">\/\/ 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