{"id":15903,"date":"2025-04-18T22:22:56","date_gmt":"2025-04-18T14:22:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/15903.html"},"modified":"2025-04-18T22:22:56","modified_gmt":"2025-04-18T14:22:56","slug":"%e3%80%90javaweb10%e3%80%91%e6%9c%8d%e5%8a%a1%e5%99%a8%e6%b8%b2%e6%9f%93%e6%8a%80%e6%9c%af-jsp","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/15903.html","title":{"rendered":"\u3010JavaWeb10\u3011\u670d\u52a1\u5668\u6e32\u67d3\u6280\u672f --- JSP"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142250-6802603a77c02.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li><font color=\"purple\">&#x1f30d;\u4e00. 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JSTL<\/font><\/li>\n<li>\n<ul>\n<li><font color=\"Deep purple\">\u2744\ufe0f1.JSTL \u6807\u7b7e\u5e93\u4ecb\u7ecd<\/font><\/li>\n<li><font color=\"Deep purple\">\u2744\ufe0f2. core \u6838\u5fc3\u5e93<\/font><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p> <font color=\"red\"> &#x1f64b;\u200d\u2642\ufe0f \u4f5c\u8005&#xff1a;&#064;whisperrr.&#x1f64b;\u200d\u2642\ufe0f &#x1f440; \u4e13\u680f&#xff1a;JavaWeb&#x1f440; &#x1f4a5; \u6807\u9898&#xff1a;\u3010JavaWeb10\u3011\u670d\u52a1\u5668\u6e32\u67d3\u6280\u672f \u2014 JSP&#x1f4a5; \u2763\ufe0f \u5bc4\u8bed&#xff1a;\u6bd4\u8f83\u662f\u5077\u8d70\u5e78\u798f\u7684\u5c0f\u5077\u2763\ufe0f<\/font> <\/p>\n<h3><font color=\"purple\">&#x1f30d;\u4e00. 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\u6280\u672f\u5141\u8bb8\u5728\u9875\u9762\u4e2d\u5d4c\u5957 java \u4ee3\u7801&#xff0c;\u4e3a\u7528\u6237\u63d0\u4f9b\u52a8\u6001\u6570\u636e \u25cf \u76f8\u6bd4 Servlet \u800c\u8a00&#xff0c;Servlet \u5f88\u96be\u5bf9\u6570\u636e\u8fdb\u884c\u6392\u7248&#xff0c;\u800c jsp \u9664\u4e86\u53ef\u4ee5\u7528 java \u4ee3\u7801\u4ea7 \u751f\u52a8\u6001\u6570\u636e\u7684\u540c\u65f6&#xff0c;\u4e5f\u5f88\u5bb9\u6613\u5bf9\u6570\u636e\u8fdb\u884c\u6392\u7248\u3002<\/p>\n<p>4.jsp \u6280\u672f\u57fa\u4e8e Servlet, \u4f60\u53ef\u4ee5\u7406\u89e3\u6210 JSP \u5c31\u662f\u5bf9 Servlet \u7684\u5305\u88c5. 5.\u4f1a\u4f7f\u7528 JSP \u7684\u7a0b\u5e8f\u5458, \u518d\u4f7f\u7528 thymeleaf \u662f\u975e\u5e38\u5bb9\u6613\u7684\u4e8b\u60c5, \u51e0\u4e4e\u662f\u65e0\u7f1d\u63a5\u8f68. 6.\u521b\u5efa hspedu_jsp WEB \u9879\u76ee&#xff0c;\u5e76\u5f15\u5165 jar <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142251-6802603b5bc68.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 7. jsp \u9875\u9762\u4e0d\u80fd\u50cf HTML \u9875\u9762, \u76f4\u63a5\u7528\u6d4f\u89c8\u5668\u8fd0\u884c\u3002\u53ea\u80fd\u901a\u8fc7\u6d4f\u89c8\u5668\u8bbf\u95ee Tomcat \u6765\u8bbf\u95eejsp \u9875\u9762<\/p>\n<h4><font color=\"Deep purple\">\u2744\ufe0f2.JSP \u8fd0\u884c\u539f\u7406<\/font><\/h4>\n<p>1.jsp \u9875\u9762\u672c\u8d28\u662f\u4e00\u4e2a Servlet \u7a0b\u5e8f, \u5176\u6027\u80fd\u662f\u548c java \u5173\u8054\u7684, \u53ea\u662f\u957f\u5f97\u4e11. 2. \u7b2c 1 \u6b21\u8bbf\u95ee jsp \u9875\u9762\u7684\u65f6\u5019\u3002Tomcat \u670d\u52a1\u5668\u4f1a\u628a jsp \u9875\u9762\u89e3\u6790\u6210\u4e3a\u4e00\u4e2a java \u6e90\u6587\u4ef6\u3002\u5e76 \u4e14 \u5bf9 \u5b83 \u8fdb \u884c \u7f16 \u8bd1 \u6210 \u4e3a .class \u5b57 \u8282 \u7801 \u7a0b \u5e8f \u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142251-6802603b75212.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5206\u6790\u4e0b cal_jsp.java \u7684\u6e90\u7801&#xff0c;\u53ef\u4ee5\u770b\u51fa\u672c\u8d28\u5c31\u662f Servlet, \u8981\u770b\u5230\u6e90\u7801\u548c\u5206\u6790\u7c7b\u56fe&#xff0c;\u9700\u8981\u52a0\u5165 jasper.jar \u8fd9\u4e2a\u5305[\u5728 tomcat\/lib \u4e0b\u62f7\u8d1d] <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142251-6802603bb0266.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\/20250418142251-6802603bc86ce.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4><font color=\"Deep purple\">\u2744\ufe0f3.page \u6307\u4ee4(\u5e38\u7528\u7684)<\/font><\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142252-6802603c0080c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<li>language \u8868\u793a jsp \u7ffb\u8bd1\u540e\u662f\u4ec0\u4e48\u8bed\u8a00\u6587\u4ef6, \u53ea\u652f\u6301 java<\/li>\n<li>contentType \u8868\u793a jsp \u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b&#xff0c;\u5bf9\u5e94\u6e90\u7801\u4e2d response.setContentType()\u53c2\u6570\u503c<\/li>\n<li>pageEncoding \u5c5e\u6027 \u8868\u793a\u5f53\u524d jsp \u9875\u9762\u6587\u4ef6\u672c\u8eab\u7684\u5b57\u7b26\u96c6<\/li>\n<li>import \u5c5e\u6027 \u8ddf java \u6e90\u4ee3\u7801\u4e2d\u4e00\u6837\u3002\u7528\u4e8e\u5bfc\u5305&#xff0c;\u5bfc\u7c7b<\/li>\n<h4><font color=\"Deep purple\">\u2744\ufe0f 4.JSP \u4e09\u79cd\u5e38\u7528\u811a\u672c<\/font><\/h4>\n<h5>1.\u58f0\u660e\u811a\u672c<\/h5>\n<p>1.\u58f0\u660e\u811a\u672c\u7684\u683c\u5f0f\u662f&#xff1a; &lt;%! \u58f0\u660e java \u4ee3\u7801 %&gt;<\/p>\n<p>\u4f5c\u7528&#xff1a;\u5b9a\u4e49 jsp \u7684\u9700\u8981\u5c5e\u6027\u3001\u65b9\u6cd5\u3001\u9759\u6001\u4ee3\u7801\u5757\u548c\u5185\u90e8\u7c7b\u7b49<\/p>\n<p>2.\u4ee3\u7801\u6f14\u793a<\/p>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span>&#064; page contentType<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span> language<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;java&#034;<\/span> <span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>title<span class=\"token operator\">&gt;<\/span>jsp \u58f0\u660e\u811a\u672c\u5e94\u7528\u5b9e\u4f8b<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 operator\">&lt;<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>h1<span class=\"token operator\">&gt;<\/span>jsp \u58f0\u660e\u811a\u672c\u5e94\u7528\u5b9e\u4f8b<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>h1<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span><span class=\"token operator\">!<\/span><br \/>\n<span class=\"token comment\">\/\/\u58f0\u660e\u5c5e\u6027 -&gt; \u8fd9\u4e2a\u5c5e\u6027\u5c31\u662f\u8be5 jsp \u6587\u4ef6\u751f\u6210\u7684 servlet statement_jsp \u7c7b\u7684<\/span><br \/>\n<span class=\"token keyword\">private<\/span> Integer id<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">private<\/span> String name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u8001\u97e9\u540c\u5b66&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">private<\/span> String job<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> String company<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">private<\/span> Double sal<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/\u9759\u6001\u4ee3\u7801\u5757<\/span><br \/>\n<span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span><br \/>\ncompany <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u5b57\u8282\u8df3\u52a8&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/\u58f0\u660e\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">public<\/span> String <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 keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>hr<span class=\"token operator\">\/<\/span><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<h5>2.\u8868\u8fbe\u5f0f\u811a\u672c<\/h5>\n<p>1.\u8868\u8fbe\u5f0f\u811a\u672c\u57fa\u672c\u8bed\u6cd5<\/p>\n<li>\u8868\u8fbe\u5f0f\u811a\u672c\u7684\u683c\u5f0f\u662f&#xff1a;&lt;%&#061;\u8868\u8fbe\u5f0f%&gt;<\/li>\n<li>\u8868\u8fbe\u5f0f\u811a\u672c\u7684\u4f5c\u7528\u662f&#xff1a;\u5728 jsp \u9875\u9762\u4e0a\u8f93\u51fa\u6570\u636e<\/li>\n<li>\u8868\u8fbe\u5f0f\u811a\u672c\u4e2d\u7684\u8868\u8fbe\u5f0f\u4e0d\u80fd\u4ee5\u5206\u53f7\u7ed3\u675f\u3002<\/li>\n<p>2.\u4ee3\u7801\u6f14\u793a<\/p>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span>&#064; page contentType<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span> language<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;java&#034;<\/span> <span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>title<span class=\"token operator\">&gt;<\/span>jsp \u8868\u8fbe\u5f0f\u811a\u672c<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 operator\">&lt;<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>h1<span class=\"token operator\">&gt;<\/span>jsp \u8868\u8fbe\u5f0f\u811a\u672c\u5e94\u7528\u5b9e\u4f8b<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>h1<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span><span class=\"token operator\">!<\/span><br \/>\nString name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u5b57\u8282\u8df3\u52a8&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>hr<span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>h1<span class=\"token operator\">&gt;<\/span>\u4e2a\u4eba\u4fe1\u606f<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>h1<span class=\"token operator\">&gt;<\/span><br \/>\n\u7528\u6237\u540d<span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%&#061;<\/span>name<span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span>br<span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token literal-property property\">\u5de5\u4f5c\u662f<\/span><span class=\"token operator\">:<\/span> <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%&#061;<\/span><span class=\"token string\">&#034;java \u5de5\u7a0b\u5e08&#034;<\/span><span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span>br<span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n\u5f97\u5230\u53c2\u6570<span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%&#061;<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getParameter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;sex&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token comment\">\/\/null<\/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<h5>3.\u4ee3\u7801\u811a\u672c<\/h5>\n<li>\u4ee3\u7801\u811a\u672c\u7684\u8bed\u6cd5\u662f&#xff1a;&lt;% java \u4ee3\u7801%&gt;<\/li>\n<li>\u4ee3\u7801\u811a\u672c\u7684\u4f5c\u7528\u662f&#xff1a;\u53ef\u4ee5\u5728 jsp \u9875\u9762\u4e2d&#xff0c;\u7f16\u5199\u6211\u4eec\u9700\u8981\u7684\u529f\u80fd&#xff08;\u4f7f\u7528 java &#xff09;<\/li>\n<li>\u53ef\u4ee5\u7531\u591a\u4e2a\u4ee3\u7801\u811a\u672c\u5757\u7ec4\u5408\u5b8c\u6210\u4e00\u4e2a\u5b8c\u6574\u7684 java \u8bed\u53e5\u3002<\/li>\n<li>\u4ee3\u7801\u811a\u672c\u8fd8\u53ef\u4ee5\u548c\u8868\u8fbe\u5f0f\u811a\u672c\u4e00\u8d77\u7ec4\u5408\u4f7f\u7528&#xff0c;\u5728 jsp \u9875\u9762\u4e0a\u8f93\u51fa\u6570\u636e<\/li>\n<h4><font color=\"Deep purple\">\u2744\ufe0f5.JSP \u5185\u7f6e\u5bf9\u8c61<\/font><\/h4>\n<p>\u25cf \u57fa\u672c\u4ecb\u7ecd [\u8bb2\u89e3] 1\u3001JSP \u5185\u7f6e\u5bf9\u8c61(\u5df2\u7ecf\u521b\u5efa\u597d\u7684\u5bf9\u8c61, \u76f4\u63a5\u4f7f\u7528 inbuild)&#xff0c;\u662f\u6307 Tomcat \u5728\u7ffb\u8bd1 jsp \u9875\u9762\u6210\u4e3aServlet \u540e&#xff0c;\u5185\u90e8\u63d0\u4f9b\u7684\u4e5d\u5927\u5bf9\u8c61&#xff0c;\u53eb\u5185\u7f6e\u5bf9\u8c61 2\u3001\u5185\u7f6e\u5bf9\u8c61&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528&#xff0c;\u4e0d\u9700\u8981\u624b\u52a8\u5b9a\u4e49<\/p>\n<p>\u25cf JSP \u4e5d\u5927\u5185\u7f6e\u5bf9\u8c61<\/p>\n<li>out \u5411\u5ba2\u6237\u7aef\u8f93\u51fa\u6570\u636e&#xff0c;out.println(&#034;&#034;);<\/li>\n<li>request \u5ba2\u6237\u7aef\u7684 http \u8bf7\u6c42<\/li>\n<li>response \u54cd\u5e94\u5bf9\u8c61<\/li>\n<li>session \u4f1a\u8bdd\u5bf9\u8c61<\/li>\n<li>application \u5bf9\u5e94 ServletContext<\/li>\n<li>pageContext jsp \u9875\u9762\u7684\u4e0a\u4e0b\u6587&#xff0c;\u662f\u4e00\u4e2a\u57df\u5bf9\u8c61&#xff0c;\u53ef\u4ee5 setAttribue(),\u4f5c\u7528\u8303\u56f4\u53ea\u662f\u672c\u9875\u9762<\/li>\n<li>exception \u5f02\u5e38\u5bf9\u8c61 , getMessage()<\/li>\n<li>page \u4ee3\u8868 jsp \u8fd9\u4e2a\u5b9e\u4f8b\u672c\u8eab<\/li>\n<li>config \u5bf9\u5e94 ServletConfig<\/li>\n<p>\u25cf \u5bf9\u7167 Servlet \u6765\u7406\u89e3\u5c31\u6bd4\u8f83\u8f7b\u677e\u4e86. (\u5b66\u6280\u672f\u7684\u601d\u8def: \u53ea\u8981\u53bb\u5b66\u67d0\u4e2a\u7c7b&#xff0c;\u5efa\u8bae\u719f\u7ec3\u8be5\u7c7b\u7684\u7ee7\u627f\u5173\u7cfb)<\/p>\n<p>\u4e00\u5f20\u56fe, \u5c55\u793a\u4e86 JSP \u7684\u7236\u7c7b HttpJspBase \u7ee7\u627f\u5173\u7cfb, \u8bf4\u660e JSP \u5185\u7f6e\u5bf9\u8c61\u7684\u6765\u6e90\u662f Servlet \u548cHttpJspPage <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142252-6802603c1d347.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4><font color=\"Deep purple\">\u2744\ufe0f6.JSP \u57df\u5bf9\u8c61<\/font><\/h4>\n<p>JSP \u56db\u5927\u57df\u5bf9\u8c61\u4ecb\u7ecd[\u4f5c\u7528&#xff1a;\u5b58\u53d6\u6570\u636e] 1.pageContext (\u57df\u5bf9\u8c61&#xff0c;\u5b58\u653e\u7684\u6570\u636e\u53ea\u80fd\u5728\u5f53\u524d\u9875\u9762\u4f7f\u7528),\u3010\u793a\u610f\u56fe\u3011\u5b66\u4e60\u6280\u672f\u5c0f\u6280\u5de7:\/\u81ea\u5df1\u5c1d\u8bd5\u53bb\u6839\u636e\u7406\u89e3\u753b\u51fa\u793a\u610f\u56fe <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142252-6802603c55ac3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 2. request (\u57df\u5bf9\u8c61&#xff0c;\u5b58\u653e\u7684\u6570\u636e\u5728\u4e00\u6b21 request \u8bf7\u6c42\u6709\u6548), \u3010\u793a\u610f\u56fe\u3011 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142252-6802603c8d7b0.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 3. session(\u57df\u5bf9\u8c61,\u5b58\u653e\u7684\u6570\u636e\u5728\u4e00\u6b21\u4f1a\u8bdd\u6709\u6548), \u3010\u793a\u610f\u56fe\u3011 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142252-6802603ccf5c4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 4. application(\u57df\u5bf9\u8c61,\u5b58\u653e\u7684\u6570\u636e\u5728\u6574\u4e2a web \u5e94\u7528\u8fd0\u884c\u671f\u95f4\u6709\u6548, \u8303\u56f4\u66f4\u5927), \u3010\u793a\u610f\u56fe\u3011 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142253-6802603d3de73.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\/20250418142253-6802603d9b45d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> JSP \u8bf7\u6c42\u8f6c\u53d1\u6807\u7b7e<\/p>\n<p><span class=\"token operator\">&lt;<\/span>jsp<span class=\"token operator\">:<\/span>forward page<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;\/bb.jsp&#034;<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">\/<\/span>jsp<span class=\"token operator\">:<\/span>forwar<\/p>\n<h3><font color=\"purple\">&#x1f30d;\u4e8c. EL<\/font><\/h3>\n<h4><font color=\"Deep purple\">\u2744\ufe0f1.EL \u8868\u8fbe\u5f0f\u4ecb\u7ecd<\/font><\/h4>\n<li>\n<p>EL \u8868\u8fbe\u5f0f\u5168\u79f0&#xff1a;Expression Language&#xff0c;\u662f\u8868\u8fbe\u5f0f\u8bed\u8a00<\/p>\n<\/li>\n<li>\n<p>EL \u8868\u8fbe\u5f0f\u4e3b\u8981\u662f\u4ee3\u66ff jsp \u9875\u9762\u7684\u8868\u8fbe\u5f0f\u811a\u672c&lt;%&#061;request.getAttribute(&#034;xx&#034;)%&gt;<\/p>\n<\/li>\n<li>\n<p>EL \u8868\u8fbe\u5f0f\u8f93\u51fa\u6570\u636e\u7684\u65f6&#xff0c;\u6bd4 jsp \u7684\u8868\u8fbe\u5f0f\u811a\u672c\u7b80\u6d01<\/p>\n<\/li>\n<li>\n<p>EL \u8868\u8fbe\u5f0f\u57fa\u672c\u8bed\u6cd5&#xff1a; ${key1}, \u4f60\u53ef\u4ee5\u7406\u89e3\u5c31\u662f\u4e00\u4e2a\u8bed\u6cd5\u7cd6<\/p>\n<\/li>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span>&#064; page contentType<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span> language<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;java&#034;<\/span> <span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>html<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>head<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span>title<span class=\"token operator\">&gt;<\/span>el \u8868\u8fbe\u5f0f\u5feb\u901f\u5165\u95e8<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 operator\">&lt;<\/span>body<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;key&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;key \u503c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\njsp \u8868 \u8fbe \u5f0f \u811a \u672c &#xff1a; <span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%&#061;<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;key&#034;<\/span><span class=\"token punctuation\">)<\/span> <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 operator\">:<\/span><br \/>\nrequest<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;key&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&lt;<\/span>br<span class=\"token operator\">\/<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token constant\">EL<\/span> \u8868\u8fbe\u5f0f&#xff1a;$<span class=\"token punctuation\">{<\/span>key<span class=\"token punctuation\">}<\/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<li>EL \u8868\u8fbe\u5f0f\u5728\u8f93\u51fa null \u65f6&#xff0c;\u8f93\u51fa\u7684\u662f \u201c\u201d 3. jsp \u8868\u8fbe\u5f0f\u811a\u672c\u8f93\u51fa null \u7684\u65f6&#xff0c;\u8f93\u51fa\u7684\u662f \u201cnull\u201d \u5b57\u7b26\u4e32<\/li>\n<li>EL \u8868\u8fbe\u5f0f\u5e38\u7528\u8f93\u51fa Bean \u7684\u666e\u901a\u5c5e\u6027\u3001 \u6570\u7ec4\u5c5e\u6027\u3001List \u96c6\u5408\u5c5e\u6027\u548c map \u96c6\u5408\u5c5e\u6027<\/li>\n<h4><font color=\"Deep purple\">\u2744\ufe0f2.EL \u8fd0\u7b97\u64cd\u4f5c<\/font><\/h4>\n<li>\u57fa\u672c\u8bed\u6cd5\u8bed\u6cd5&#xff1a;${ \u8fd0\u7b97\u8868\u8fbe\u5f0f } \u8bed\u6cd5&#xff1a;${ \u8fd0\u7b97\u8868\u8fbe\u5f0f }<\/li>\n<li>\u5173\u7cfb\u8fd0\u7b97 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142253-6802603de6cf6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<li>\u903b\u8f91\u8fd0\u7b97 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142254-6802603e1a219.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<li>\u7b97\u6570\u8fd0\u7b97 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142254-6802603e40e4e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<p>EL \u7684 empty \u8fd0\u7b97<\/p>\n<p>empty \u8fd0\u7b97\u53ef\u4ee5\u5224\u65ad\u4e00\u4e2a\u6570\u636e\u662f\u5426\u4e3a\u7a7a&#xff0c;\u5982\u679c\u4e3a\u7a7a&#xff0c;\u8fd4\u56de true&#xff0c;\u5426\u5219\u8fd4\u56de false \u4ee5\u4e0b\u51e0\u79cd\u60c5\u51b5\u4e3a\u7a7a<\/p>\n<p>\u25cf \u503c\u4e3a null \u25cf \u503c\u4e3a\u7a7a\u4e32\u7684\u65f6 \u25cf \u503c\u662f Object \u7c7b\u578b\u6570\u7ec4&#xff0c;\u957f\u5ea6\u4e3a\u96f6 \u25cf list \u96c6\u5408&#xff0c;\u5143\u7d20\u4e2a\u6570\u4e3a\u96f6 \u25cf map \u96c6\u5408&#xff0c;\u5143\u7d20\u4e2a\u6570\u4e3a\u96f6<\/p>\n<h4><font color=\"Deep purple\">\u2744\ufe0f3.EL \u7684 11 \u4e2a\u9690\u542b\u5bf9\u8c61<\/font><\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142254-6802603e73b39.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> EL \u56db\u4e2a\u7279\u5b9a\u57df\u53d8\u91cf <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142254-6802603ecec8e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> pageContext \u5bf9\u8c61\u4ecb\u7ecd \u534f\u8bae&#xff1a; ${ pageContext.request.scheme } \u670d\u52a1\u5668 ip&#xff1a;${ pageContext.request.serverName } \u670d\u52a1\u5668\u7aef\u53e3&#xff1a;${ pageContext.request.serverPort } \u5de5\u7a0b\u8def\u5f84&#xff1a;${ pageContext.request.contextPath } \u8bf7\u6c42\u65b9\u6cd5&#xff1a;${ pageContext.request.method } \u5ba2\u6237\u7aef ip \u5730\u5740&#xff1a;${ pageContext.request.remoteHost } \u4f1a\u8bdd id &#xff1a;${ pageContext.session.id }<\/p>\n<h3><font color=\"purple\">&#x1f30d;\u4e09. JSTL<\/font><\/h3>\n<h4><font color=\"Deep purple\">\u2744\ufe0f1.JSTL \u6807\u7b7e\u5e93\u4ecb\u7ecd<\/font><\/h4>\n<li>JSTL \u6807\u7b7e\u5e93 \u662f\u6307 JSP Standard Tag Library JSP \u6807\u51c6\u6807\u7b7e\u5e93<\/li>\n<li>EL \u8868\u8fbe\u5f0f\u662f\u4e3a\u4e86\u66ff\u6362 jsp \u4e2d\u7684\u8868\u8fbe\u5f0f\u811a\u672c&#xff0c;JSTL \u662f\u4e3a\u4e86\u66ff\u6362\u4ee3\u7801\u811a\u672c\u3002\u8fd9\u6837 jsp \u9875\u9762 \u53d8\u5f97\u66f4\u4f73\u7b80\u6d01<\/li>\n<li>JSTL \u7531\u4e94\u4e2a\u6807\u7b7e\u5e93\u7ec4\u6210 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142255-6802603f115da.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<li>\u4f7f\u7528 JSTL&#xff0c;\u9700\u8981\u5bfc\u5165\u76f8\u5173\u7684 jar \u5305 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418142255-6802603f43f05.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<p>\u4ee3\u7801\u6f14\u793a<\/p>\n<p><span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span>&#064;taglib prefix<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;c&#034;<\/span> uri<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;http:\/\/java.sun.com\/jsp\/jstl\/core&#034;<\/span> <span class=\"token operator\">%<\/span><span class=\"token operator\">&gt;<\/span><br \/>\n\u97e9\u987a\u5e73 Java \u5de5\u7a0b\u5e08<br \/>\n<span class=\"token operator\">&lt;<\/span><span class=\"token operator\">%<\/span>&#064; page contentType<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text\/html;charset&#061;UTF-8&#034;<\/span> language<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;java&#034;<\/span> <span class=\"token operator\">%<\/span><span class=\"token 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