{"id":117842,"date":"2026-10-25T16:56:24","date_gmt":"2026-10-25T08:56:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/117842.html"},"modified":"2026-10-25T16:56:24","modified_gmt":"2026-10-25T08:56:24","slug":"%e3%80%90javaee%e3%80%91springboot-%e7%bb%9f%e4%b8%80%e5%8a%9f%e8%83%bd%e5%a4%84%e7%90%86-%e6%8b%a6%e6%88%aa%e5%99%a8%e3%80%81%e7%bb%9f%e4%b8%80%e8%bf%94%e5%9b%9e%e4%b8%8e%e5%85%a8%e5%b1%80%e5%bc%82","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/117842.html","title":{"rendered":"\u3010JavaEE\u3011SpringBoot \u7edf\u4e00\u529f\u80fd\u5904\u7406: \u62e6\u622a\u5668\u3001\u7edf\u4e00\u8fd4\u56de\u4e0e\u5168\u5c40\u5f02\u5e38"},"content":{"rendered":"<p>\u901a\u8fc7\u672c\u6587\u6211\u4eec\u5c06&#xff1a;<\/p>\n<ul>\n<li class=\"task-list-item\"> \u638c\u63e1\u62e6\u622a\u5668\u7684\u4f7f\u7528\u53ca\u5176\u539f\u7406<\/li>\n<li class=\"task-list-item\"> \u5b66\u4e60\u7edf\u4e00\u6570\u636e\u8fd4\u56de\u683c\u5f0f\u548c\u7edf\u4e00\u5f02\u5e38\u5904\u7406\u7684\u64cd\u4f5c<\/li>\n<li class=\"task-list-item\"> \u4e86\u89e3\u4e00\u4e9b Spring \u7684\u6e90\u7801<\/li>\n<\/ul>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>1. \u62e6\u622a\u5668&#xff1a;\u628a\u767b\u5f55\u6821\u9a8c\u4ece\u6bcf\u4e2a\u63a5\u53e3\u91cc\u62bd\u51fa\u6765<\/li>\n<li>\n<ul>\n<li>1.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u62e6\u622a\u5668<\/li>\n<li>1.2 \u5feb\u901f\u5165\u95e8&#xff1a;\u5b9e\u73b0 HandlerInterceptor<\/li>\n<li>1.3 \u6ce8\u518c\u62e6\u622a\u5668\u4e0e\u8def\u5f84\u63a7\u5236<\/li>\n<li>1.4 \u5b9e\u6218&#xff1a;\u7528\u62e6\u622a\u5668\u5b8c\u6210\u767b\u5f55\u6821\u9a8c<\/li>\n<\/ul>\n<\/li>\n<li>2. \u7edf\u4e00\u6570\u636e\u8fd4\u56de\u683c\u5f0f&#xff1a;\u8ba9\u6240\u6709\u63a5\u53e3\u8bf4\u540c\u4e00\u79cd\u201c\u8bed\u8a00\u201d<\/li>\n<li>\n<ul>\n<li>2.1 \u624b\u52a8\u5305\u88c5\u7684\u75db\u70b9<\/li>\n<li>2.2 &#064;ControllerAdvice &#043; ResponseBodyAdvice<\/li>\n<li>2.3 \u4e3a\u4ec0\u4e48\u8fd4\u56de String \u65f6\u4f1a\u62a5 ClassCastException<\/li>\n<li>2.4 \u4e00\u4e2a\u503c\u5f97\u77e5\u9053\u7684\u6743\u8861<\/li>\n<\/ul>\n<\/li>\n<li>3. \u7edf\u4e00\u5f02\u5e38\u5904\u7406&#xff1a;\u4e0d\u8ba9\u5f02\u5e38\u201c\u88f8\u5954\u201d\u5230\u524d\u7aef<\/li>\n<li>\n<ul>\n<li>3.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u5168\u5c40\u5f02\u5e38\u5904\u7406<\/li>\n<li>3.2 \u5feb\u901f\u5165\u95e8&#xff1a;&#064;ControllerAdvice &#043; &#064;ExceptionHandler<\/li>\n<li>3.3 \u5206\u5c42\u6355\u83b7&#xff1a;\u7cbe\u786e\u5f02\u5e38\u4f18\u5148&#xff0c;Exception \u515c\u5e95<\/li>\n<\/ul>\n<\/li>\n<li>4. \u6e90\u7801\u8109\u7edc&#xff1a;DispatcherServlet \u4e0e &#064;ControllerAdvice \u7684\u534f\u4f5c<\/li>\n<li>5. \u524d\u7aef Ajax \u914d\u5408\u6539\u9020<\/li>\n<li>\u603b\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<p>\u5728\u771f\u5b9e\u7684 Web \u9879\u76ee\u4e2d&#xff0c;\u6211\u4eec\u5f88\u5feb\u4f1a\u9047\u5230\u4e09\u7c7b \u201c\u91cd\u590d\u4e14\u5206\u6563\u201d \u7684\u95ee\u9898&#xff1a;<\/p>\n<li>\u6bcf\u4e2a\u63a5\u53e3\u90fd\u8981\u624b\u5199\u767b\u5f55\u6821\u9a8c<\/li>\n<li>\u6bcf\u4e2a Controller \u90fd\u8981\u624b\u52a8\u5305\u88c5\u8fd4\u56de\u7ed3\u679c<\/li>\n<li>\u6bcf\u4e2a\u65b9\u6cd5\u91cc\u90fd\u8981 try-catch \u5904\u7406\u5f02\u5e38\u3002<\/li>\n<p>SpringBoot \u63d0\u4f9b\u4e86\u4e00\u5957\u7edf\u4e00\u7684\u673a\u5236&#xff0c;\u8ba9\u6211\u4eec\u628a\u8fd9\u4e9b\u6a2a\u5207\u903b\u8f91\u4ece\u4e1a\u52a1\u4ee3\u7801\u4e2d\u62bd\u79bb\u51fa\u6765\u3002<\/p>\n<p>\u672c\u6587\u6309\u7167\u62e6\u622a\u5668 \u2192 \u7edf\u4e00\u6570\u636e\u8fd4\u56de \u2192 \u7edf\u4e00\u5f02\u5e38\u5904\u7406 \u2192 \u6e90\u7801\u8109\u7edc \u2192 \u524d\u7aef\u914d\u5408\u7684\u987a\u5e8f&#xff0c;\u5e26\u4f60\u4ece\u96f6\u7406\u89e3\u5e76\u843d\u5730\u8fd9\u4e09\u9879\u80fd\u529b\u3002<\/p>\n<h2>1. \u62e6\u622a\u5668&#xff1a;\u628a\u767b\u5f55\u6821\u9a8c\u4ece\u6bcf\u4e2a\u63a5\u53e3\u91cc\u62bd\u51fa\u6765<\/h2>\n<h3>1.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u62e6\u622a\u5668<\/h3>\n<p>\u5728\u6ca1\u6709\u62e6\u622a\u5668\u4e4b\u524d&#xff0c;\u5b9e\u73b0\u5f3a\u5236\u767b\u5f55\u6700\u5e38\u89c1\u7684\u5199\u6cd5\u662f\u5728\u6bcf\u4e2a\u63a5\u53e3\u65b9\u6cd5\u91cc\u90fd\u68c0\u67e5\u4e00\u904d Session&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;RequestMapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/getListByPage&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Result<\/span> <span class=\"token function\">getListByPage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PageRequest<\/span> pageRequest<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpSession<\/span> session<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/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 constant\">SESSION_USER_KEY<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">unlogin<\/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 comment\">\/\/ \u771f\u6b63\u7684\u4e1a\u52a1\u903b\u8f91\u2026\u2026<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u95ee\u9898\u5f88\u660e\u663e&#xff1a;\u63a5\u53e3\u6709\u591a\u5c11\u4e2a&#xff0c;\u8fd9\u6bb5\u91cd\u590d\u4ee3\u7801\u5c31\u8981\u5199\u591a\u5c11\u904d&#xff1b;\u5c06\u6765\u767b\u5f55\u89c4\u5219\u4e00\u53d8&#xff0c;\u6240\u6709\u63a5\u53e3\u90fd\u5f97\u8ddf\u7740\u6539\u3002\u62e6\u622a\u5668\u6b63\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u7c7b \u201c\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u8981\u505a\u540c\u4e00\u4ef6\u4e8b\u201d \u7684\u573a\u666f\u800c\u8bbe\u8ba1\u7684\u3002\u5b83\u5728\u8bf7\u6c42\u8fdb\u5165 Controller \u4e4b\u524d\u3001Controller \u6267\u884c\u4e4b\u540e\u3001\u8bf7\u6c42\u5b8c\u5168\u7ed3\u675f\u4e4b\u540e&#xff0c;\u63d0\u4f9b\u4e86\u4e09\u4e2a\u53ef\u63d2\u5165\u81ea\u5b9a\u4e49\u903b\u8f91\u7684\u65f6\u673a\u3002<\/p>\n<p>\u540e\u7aef\u6b63\u5e38\u7684\u8c03\u7528\u987a\u5e8f&#xff1a;<\/p>\n<p>   \u7528\u6237<br \/>\n\u2193 \u8c03\u7528<br \/>\nController\u63a7\u5236\u5c42<br \/>\n\u2193<br \/>\nService\u670d\u52a1\u5c42<br \/>\n\u2193<br \/>\nMapper\u6570\u636e\u6301\u4e45\u5c42<br \/>\n\u2193 \u8c03\u7528<br \/>\nDataBase\u6570\u636e\u5e93<\/p>\n<p>\u52a0\u5165\u62e6\u622a\u5668\u4e4b\u540e\u7684\u8c03\u7528\u987a\u5e8f&#xff1a;<\/p>\n<p>   \u7528\u6237<br \/>\n\u2193 \u8c03\u7528<br \/>\nInterceptor\u62e6\u622a\u5668 \u2192 false:\u62e6\u622a<br \/>\n\u2193 true:\u653e\u884c<br \/>\nController\u63a7\u5236\u5c42<br \/>\n\u2193<br \/>\nService\u670d\u52a1\u5c42<br \/>\n\u2193<br \/>\nMapper\u6570\u636e\u6301\u4e45\u5c42<br \/>\n\u2193 \u8c03\u7528<br \/>\nDataBase\u6570\u636e\u5e93<\/p>\n<p>\u6dfb\u52a0\u62e6\u622a\u5668\u540e&#xff0c;\u5728\u6267\u884c Controller \u7684\u65b9\u6cd5\u4e4b\u524d\u8bf7\u6c42\u4f1a\u5148\u88ab\u62e6\u622a\u5668\u62e6\u622a\u4f4f\u5e76\u6267\u884c preHandle \u65b9\u6cd5&#xff0c;\u8fd9\u4e2a\u65b9\u6cd5\u9700\u8981\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u7c7b\u578b\u7684\u503c&#xff1a;\u5982\u679c\u8fd4\u56de true&#xff0c;\u5c31\u8868\u793a\u653e\u884c\u672c\u6b21\u8bf7\u6c42&#xff0c;\u7ee7\u7eed\u8bbf\u95ee Controller \u4e2d\u7684\u65b9\u6cd5&#xff1b;\u5982\u679c\u8fd4\u56de false&#xff0c;\u5219\u4e0d\u4f1a\u653e\u884c&#xff0c;Controller \u4e2d\u7684\u65b9\u6cd5\u4e5f\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n<h3>1.2 \u5feb\u901f\u5165\u95e8&#xff1a;\u5b9e\u73b0 HandlerInterceptor<\/h3>\n<p>\u81ea\u5b9a\u4e49\u62e6\u622a\u5668\u53ea\u9700\u5b9e\u73b0 HandlerInterceptor \u63a5\u53e3&#xff0c;\u91cd\u5199\u4e09\u4e2a\u65b9\u6cd5&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Slf4j<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoginInterceptor<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">HandlerInterceptor<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">preHandle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> request<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token class-name\">HttpServletResponse<\/span> response<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token class-name\">Object<\/span> handler<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Exception<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;preHandle&#xff1a;\u76ee\u6807\u65b9\u6cd5\u6267\u884c\u524d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <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\">postHandle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> request<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token class-name\">HttpServletResponse<\/span> response<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token class-name\">Object<\/span> handler<span class=\"token punctuation\">,<\/span><br \/>\n                           <span class=\"token class-name\">ModelAndView<\/span> modelAndView<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Exception<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;postHandle&#xff1a;\u76ee\u6807\u65b9\u6cd5\u6267\u884c\u540e&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <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\">afterCompletion<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> request<span class=\"token punctuation\">,<\/span><br \/>\n                                <span class=\"token class-name\">HttpServletResponse<\/span> response<span class=\"token punctuation\">,<\/span><br \/>\n                                <span class=\"token class-name\">Object<\/span> handler<span class=\"token punctuation\">,<\/span><br \/>\n                                <span class=\"token class-name\">Exception<\/span> ex<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Exception<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;afterCompletion&#xff1a;\u89c6\u56fe\u6e32\u67d3\u5b8c\u6bd5\u540e\u6267\u884c&#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>\u4e09\u4e2a\u65b9\u6cd5\u7684\u804c\u8d23\u548c\u8fd4\u56de\u503c\u542b\u4e49\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>preHandle &#xff1a;\u5728 Handler \u6267\u884c\u524d\u8c03\u7528&#xff0c;\u8fd4\u56de\u503c\u662f\u5e03\u5c14\u7c7b\u578b\u3002\u8fd4\u56de true \u8868\u793a\u653e\u884c&#xff0c;\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u62e6\u622a\u5668\u548c Controller&#xff1b;\u8fd4\u56de false \u5219\u4e2d\u65ad\u6574\u4e2a\u8bf7\u6c42&#xff0c;Controller \u4e0d\u4f1a\u88ab\u6267\u884c\u3002<\/li>\n<li>postHandle &#xff1a;\u5728 Controller \u65b9\u6cd5\u6b63\u5e38\u6267\u884c\u5b8c\u6bd5\u540e\u3001\u89c6\u56fe\u6e32\u67d3\u4e4b\u524d\u8c03\u7528\u3002\u5982\u679c Controller \u629b\u51fa\u4e86\u5f02\u5e38&#xff0c;\u8fd9\u4e2a\u65b9\u6cd5\u4e0d\u4f1a\u6267\u884c\u3002<\/li>\n<li>afterCompletion &#xff1a;\u5728\u6574\u4e2a\u8bf7\u6c42\u5904\u7406\u5b8c\u6210\u540e\u8c03\u7528&#xff0c;\u4e3b\u8981\u4efb\u52a1\u662f\u91ca\u653e\u6267\u884c preHandle \u65f6\u7533\u8bf7\u7684\u8d44\u6e90\u3002\u5f53\u67d0\u4e2a\u62e6\u622a\u5668\u7684 preHandle \u8fd4\u56de false \u5bfc\u81f4\u8bf7\u6c42\u4e2d\u65ad\u65f6&#xff0c;DispatcherServlet \u6846\u67b6\u4f1a\u9006\u5e8f\u8c03\u7528\u6b64\u524d\u5df2\u7ecf\u6210\u529f\u6267\u884c\u8fc7 preHandle \u5e76\u8fd4\u56de true \u7684\u62e6\u622a\u5668\u7684 afterCompletion&#xff1b;\u5f53\u524d\u8fd4\u56de false \u7684\u62e6\u622a\u5668\u81ea\u8eab\u7684 afterCompletion \u4e0d\u4f1a\u6267\u884c&#xff0c;\u5b83\u540e\u9762\u7684\u62e6\u622a\u5668\u4e5f\u4e0d\u4f1a\u6267\u884c\u3002\u8fd9\u662f\u6e05\u7406\u8d44\u6e90\u3001\u8bb0\u5f55\u6700\u7ec8\u8017\u65f6\u6700\u5408\u9002\u7684\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n<p>\u6b63\u5e38\u8bf7\u6c42\u4e0b\u4e09\u4e2a\u65b9\u6cd5\u7684\u6267\u884c\u987a\u5e8f\u662f&#xff1a;<\/p>\n<p>preHandle<br \/>\n \u2193<br \/>\nController \u65b9\u6cd5<br \/>\n \u2193<br \/>\npostHandle<br \/>\n \u2193<br \/>\nafterCompletion<\/p>\n<p>\u5982\u679c\u628a preHandle \u7684\u8fd4\u56de\u503c\u6539\u6210 false&#xff0c;\u65e5\u5fd7\u4f1a\u505c\u5728 preHandle&#xff0c;\u8bf7\u6c42\u4e0d\u4f1a\u518d\u8fdb\u5165 Controller&#xff0c;\u54cd\u5e94\u4e5f\u4e0d\u4f1a\u6b63\u5e38\u6e32\u67d3\u3002<\/p>\n<ul>\n<li>\u4e00\u4e2a\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u7ec6\u8282&#xff1a;\u5f02\u6b65\u8bf7\u6c42\u3002&#xff1a;\n<ul>\n<li>\u5f53 Controller \u8fd4\u56de Callable \u6216\u4f7f\u7528 DeferredResult \u65f6&#xff0c;Servlet \u4e3b\u7ebf\u7a0b\u4f1a\u5148\u9000\u51fa&#xff0c;\u6b64\u65f6 postHandle \u548c afterCompletion \u4e0d\u4f1a\u5728\u672c\u6b21\u7ebf\u7a0b\u4e2d\u6267\u884c\u3002\u7b49\u5f02\u6b65\u5904\u7406\u5b8c\u6210\u3001\u8bf7\u6c42\u91cd\u65b0 dispatch \u56de\u6765\u65f6&#xff0c;\u6846\u67b6\u4f1a\u518d\u6b21\u8c03\u7528 preHandle \u548c postHandle\u3002\u5982\u679c\u4f60\u7684\u62e6\u622a\u5668\u4f9d\u8d56 postHandle \u505a\u6536\u5c3e\u5de5\u4f5c&#xff0c;\u5728\u5f02\u6b65\u573a\u666f\u4e0b\u9700\u8981\u6539\u7528 AsyncHandlerInterceptor \u7684 afterConcurrentHandlingStarted&#xff0c;\u6216\u8005\u786e\u4fdd\u903b\u8f91\u653e\u5728 afterCompletion \u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1.3 \u6ce8\u518c\u62e6\u622a\u5668\u4e0e\u8def\u5f84\u63a7\u5236<\/h3>\n<p>\u5b9a\u4e49\u597d\u62e6\u622a\u5668\u540e&#xff0c;\u9700\u8981\u901a\u8fc7 WebMvcConfigurer \u7684 addInterceptors \u628a\u5b83\u6ce8\u518c\u8fdb\u53bb&#xff0c;\u5e76\u6307\u5b9a\u62e6\u622a\u8303\u56f4\u548c\u6392\u9664\u8303\u56f4&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Configuration<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">WebConfig<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">WebMvcConfigurer<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">LoginInterceptor<\/span> loginInterceptor<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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\">addInterceptors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterceptorRegistry<\/span> registry<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        registry<span class=\"token punctuation\">.<\/span><span class=\"token function\">addInterceptor<\/span><span class=\"token punctuation\">(<\/span>loginInterceptor<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">addPathPatterns<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/**&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">excludePathPatterns<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                        <span class=\"token string\">&#034;\/user\/login&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token string\">&#034;\/**\/*.js&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token string\">&#034;\/**\/*.css&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token string\">&#034;\/**\/*.png&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token string\">&#034;\/**\/*.html&#034;<\/span><br \/>\n                <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>\u8def\u5f84\u6a21\u5f0f\u4e2d&#xff0c;\/* \u53ea\u5339\u914d\u4e00\u7ea7\u8def\u5f84&#xff08;\u5982 \/user\u3001\/book&#xff09;&#xff0c;\/** \u5339\u914d\u4efb\u610f\u5c42\u7ea7\u8def\u5f84\u3002\u5b9e\u9645\u9879\u76ee\u4e2d\u6700\u5bb9\u6613\u8e29\u7684\u5751\u662f \u9759\u6001\u8d44\u6e90\u6ca1\u6709\u88ab\u6b63\u786e\u6392\u9664\u3002\u4e00\u65e6\u4f60\u5728 addPathPatterns(&#034;\/**&#034;) \u7684\u540c\u65f6\u6ca1\u6709\u6392\u9664 \/**\/*.js\u3001\/**\/*.css \u7b49&#xff0c;\u6d4f\u89c8\u5668\u52a0\u8f7d\u524d\u7aef\u9875\u9762\u65f6\u4f1a\u8fde JS \u548c CSS \u90fd\u88ab\u62e6\u622a\u5668\u62e6\u4f4f&#xff0c;\u9875\u9762\u76f4\u63a5\u767d\u5c4f\u3002\u63a8\u8350\u7684\u6392\u9664\u5217\u8868\u4e2d\u81f3\u5c11\u5e94\u5305\u542b \/**\/*.js\u3001\/**\/*.css\u3001\/**\/*.png\u3001\/**\/*.html&#xff0c;\u5982\u679c\u9879\u76ee\u6709 Swagger&#xff0c;\u8fd8\u8981\u6392\u9664 \/swagger-ui\/** \u548c \/v3\/api-docs\/**\u3002<\/p>\n<h3>1.4 \u5b9e\u6218&#xff1a;\u7528\u62e6\u622a\u5668\u5b8c\u6210\u767b\u5f55\u6821\u9a8c<\/h3>\n<p>\u628a Session \u6821\u9a8c\u903b\u8f91\u642c\u8fdb preHandle&#xff0c;\u6240\u6709\u63a5\u53e3\u5c31\u81ea\u52a8\u62e5\u6709\u4e86\u767b\u5f55\u4fdd\u62a4&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Slf4j<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoginInterceptor<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">HandlerInterceptor<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">preHandle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HttpServletRequest<\/span> request<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token class-name\">HttpServletResponse<\/span> response<span class=\"token punctuation\">,<\/span><br \/>\n                             <span class=\"token class-name\">Object<\/span> handler<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Exception<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">HttpSession<\/span> session <span class=\"token operator\">&#061;<\/span> request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSession<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>session <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><br \/>\n                <span class=\"token operator\">&amp;&amp;<\/span> session<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAttribute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Constants<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">SESSION_USER_KEY<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        response<span class=\"token punctuation\">.<\/span><span class=\"token function\">setStatus<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">401<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u91cc\u8bbe\u7f6e HTTP \u72b6\u6001\u7801 401 Unauthorized &#xff0c;\u8bed\u4e49\u662f \u201c\u8bf7\u6c42\u9700\u8981\u8eab\u4efd\u8ba4\u8bc1&#xff0c;\u4e14\u5f53\u524d\u672a\u63d0\u4f9b\u6216\u8ba4\u8bc1\u5931\u8d25\u201d\u3002\u524d\u7aef Ajax \u7684 error \u56de\u8c03\u53ef\u4ee5\u901a\u8fc7\u5224\u65ad error.status &#061;&#061;&#061; 401 \u7edf\u4e00\u8df3\u8f6c\u5230\u767b\u5f55\u9875&#xff0c;\u800c\u4e0d\u9700\u8981\u89e3\u6790\u54cd\u5e94\u4f53\u4e2d\u7684\u4e1a\u52a1\u7801\u3002\u8fd9\u662f\u62e6\u622a\u5668\u4e0e\u524d\u7aef\u914d\u5408\u7684\u4e00\u4e2a\u5173\u952e\u7ea6\u5b9a\u3002<\/p>\n<h2>2. \u7edf\u4e00\u6570\u636e\u8fd4\u56de\u683c\u5f0f&#xff1a;\u8ba9\u6240\u6709\u63a5\u53e3\u8bf4\u540c\u4e00\u79cd\u201c\u8bed\u8a00\u201d<\/h2>\n<h3>2.1 \u624b\u52a8\u5305\u88c5\u7684\u75db\u70b9<\/h3>\n<p>\u5728\u62e6\u622a\u5668\u89e3\u51b3\u767b\u5f55\u95ee\u9898\u4e4b\u540e&#xff0c;\u53e6\u4e00\u4e2a\u91cd\u590d\u52b3\u52a8\u6d6e\u51fa\u6c34\u9762&#xff1a;\u6bcf\u4e2a Controller \u65b9\u6cd5\u90fd\u8981\u624b\u52a8\u5199 return Result.success(data)\u3002\u4e00\u65e6\u67d0\u4e2a\u63a5\u53e3\u5fd8\u8bb0\u5305\u88c5&#xff0c;\u524d\u7aef\u62ff\u5230\u7684\u5c31\u662f\u88f8\u6570\u636e&#xff0c;\u89e3\u6790\u903b\u8f91\u7acb\u523b\u5d29\u6e83\u3002\u7406\u60f3\u7684\u72b6\u6001\u662f&#xff1a;Controller \u53ea\u7ba1\u8fd4\u56de\u4e1a\u52a1\u6570\u636e\u672c\u8eab&#xff0c;\u6846\u67b6\u81ea\u52a8\u5957\u4e0a\u7edf\u4e00\u7684\u5916\u58f3\u3002<\/p>\n<h3>2.2 &#064;ControllerAdvice &#043; ResponseBodyAdvice<\/h3>\n<p>SpringMVC \u63d0\u4f9b\u4e86 ResponseBodyAdvice \u63a5\u53e3&#xff0c;\u5141\u8bb8\u5728\u54cd\u5e94\u4f53\u88ab HttpMessageConverter \u5199\u51fa\u4e4b\u524d\u8fdb\u884c\u62e6\u622a\u548c\u4fee\u6539\u3002\u914d\u5408 &#064;ControllerAdvice&#xff0c;\u5c31\u53ef\u4ee5\u5bf9\u6240\u6709 Controller \u7684\u8fd4\u56de\u503c\u7edf\u4e00\u52a0\u5de5&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;ControllerAdvice<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ResponseAdvice<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">ResponseBodyAdvice<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ObjectMapper<\/span> mapper <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectMapper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">supports<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MethodParameter<\/span> returnType<span class=\"token punctuation\">,<\/span><br \/>\n                            <span class=\"token class-name\">Class<\/span> converterType<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">beforeBodyWrite<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> body<span class=\"token punctuation\">,<\/span><br \/>\n                                  <span class=\"token class-name\">MethodParameter<\/span> returnType<span class=\"token punctuation\">,<\/span><br \/>\n                                  <span class=\"token class-name\">MediaType<\/span> selectedContentType<span class=\"token punctuation\">,<\/span><br \/>\n                                  <span class=\"token class-name\">Class<\/span> selectedConverterType<span class=\"token punctuation\">,<\/span><br \/>\n                                  <span class=\"token class-name\">ServerHttpRequest<\/span> request<span class=\"token punctuation\">,<\/span><br \/>\n                                  <span class=\"token class-name\">ServerHttpResponse<\/span> response<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>body <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> body<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>body <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> mapper<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeValueAsString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">success<\/span><span class=\"token punctuation\">(<\/span>body<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span>e<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 keyword\">return<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">success<\/span><span class=\"token punctuation\">(<\/span>body<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>supports \u8fd4\u56de true \u8868\u793a&#xff1a;\u5bf9\u4e8e\u88ab &#064;ControllerAdvice \u8986\u76d6\u3001\u4e14\u901a\u8fc7 HttpMessageConverter \u5199\u51fa\u54cd\u5e94\u4f53\u7684 Controller \u65b9\u6cd5&#xff0c;\u5141\u8bb8\u8c03\u7528 beforeBodyWrite \u8fdb\u884c\u5305\u88c5&#xff1b;\u8fd4\u56de false \u5219\u8df3\u8fc7\u8be5 Advice\u3002\u8fd4\u56de true \u53ea\u662f\u201c\u5141\u8bb8\u8c03\u7528\u201d&#xff0c;\u662f\u5426\u771f\u6b63\u5305\u88c5\u8fd8\u7531 beforeBodyWrite \u5185\u90e8\u903b\u8f91\u51b3\u5b9a\u3002<\/p>\n<p>\u8981\u8ba9 supports \u8fd4\u56de true \u771f\u6b63\u8d77\u5230 \u201c\u7edf\u4e00\u5305\u88c5\u201d\u7684\u6548\u679c&#xff0c;\u4e0b\u9762\u4e09\u4ef6\u4e8b\u5f97\u540c\u65f6\u6210\u7acb&#xff1a;<\/p>\n<li>\u8fd9\u4e2a Controller \u65b9\u6cd5\u5728 &#064;ControllerAdvice \u7684\u8986\u76d6\u8303\u56f4\u5185\u3002&#064;ControllerAdvice \u9ed8\u8ba4\u8986\u76d6\u6240\u6709 Controller&#xff1b;\u4e00\u65e6\u914d\u7f6e\u4e86 basePackages\u3001assignableTypes\u3001annotations \u8fd9\u4e9b\u5c5e\u6027&#xff0c;\u8986\u76d6\u8303\u56f4\u5c31\u53d8\u5c0f\u4e86\u3002<\/li>\n<p><span class=\"token annotation punctuation\">&#064;Target<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ElementType<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">TYPE<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Retention<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RetentionPolicy<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">RUNTIME<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Documented<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token annotation punctuation\">&#064;interface<\/span> <span class=\"token class-name\">ControllerAdvice<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * basePackages \u5c5e\u6027\u7684\u522b\u540d\u3002<br \/>\n * \u5141\u8bb8\u66f4\u7b80\u6d01\u7684\u6ce8\u91ca\u58f0\u660e\u2014\u2014\u4f8b\u5982&#xff0c;&#064;ControllerAdvice(\u201corg.my.pkg\u201d) \u7b49\u6548\u4e8e &#064;ControllerAdvices(basePackages&#061;\u201corg.my.pkg\u201d)<br \/>\n * &#064;since 4.0<br \/>\n *\/<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;AliasFor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;basePackages&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">value<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;AliasFor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;value&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">basePackages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">assignableTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Annotation<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">annotations<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">default<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<li>\u8fd9\u4e2a\u8fd4\u56de\u503c\u662f\u901a\u8fc7 HttpMessageConverter \u5199\u51fa\u54cd\u5e94\u4f53\u7684\u3002&#064;ResponseBody\u3001&#064;RestController\u3001ResponseEntity \u8fd9\u7c7b\u8fd4\u56de\u503c\u4f1a\u8d70\u8fd9\u6761\u94fe\u8def&#xff1b;\u5982\u679c Controller \u8fd4\u56de\u7684\u662f ModelAndView \u6216\u8005\u89c6\u56fe\u540d&#xff0c;\u538b\u6839\u4e0d\u7ecf\u8fc7 ResponseBodyAdvice&#xff0c;\u81ea\u7136\u4e5f\u4e0d\u4f1a\u88ab\u5305\u88c5\u3002<\/li>\n<p><span class=\"token comment\">\/**<br \/>\n * \u7528\u4e8e\u5728HTTP\u8bf7\u6c42\u548c\u54cd\u5e94\u4e4b\u95f4\u8fdb\u884c\u8f6c\u6362\u7684\u7b56\u7565\u63a5\u53e3\u3002<br \/>\n *<br \/>\n * &#064;author Arjen Poutsma<br \/>\n * &#064;author Juergen Hoeller<br \/>\n * &#064;author Rossen Stoyanchev<br \/>\n * &#064;since 3.0<br \/>\n * &#064;param &lt;T&gt; \u8f6c\u6362\u540e\u7684\u5bf9\u8c61\u7c7b\u578b<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">HttpMessageConverter<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6307\u793a\u6b64\u8f6c\u6362\u5668\u662f\u5426\u53ef\u4ee5\u8bfb\u53d6\u7ed9\u5b9a\u7684\u7c7b\u3002<br \/>\n * &#064;param clazz \u6d4b\u8bd5\u53ef\u8bfb\u6027\u7684\u7c7b<br \/>\n * &#064;param mediaType \u8981\u8bfb\u53d6\u7684\u5a92\u4f53\u7c7b\u578b(\u5982\u679c\u672a\u6307\u5b9a&#xff0c;\u53ef\u4ee5\u662fnull)&#xff1b;\u901a\u5e38\u662f\u62a5\u5934\u4e2d Content-Type \u5c5e\u6027\u7684\u503c\u3002<br \/>\n * &#064;return \u5982\u679c\u53ef\u8bfb&#xff0c;\u5219\u4e3atrue&#xff1b;\u5426\u5219\u4e3afalse<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">boolean<\/span> <span class=\"token function\">canRead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> clazz<span class=\"token punctuation\">,<\/span> <span class=\"token annotation punctuation\">&#064;Nullable<\/span> <span class=\"token class-name\">MediaType<\/span> mediaType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6307\u660e\u7ed9\u5b9a\u7684\u7c7b\u662f\u5426\u53ef\u4ee5\u7531\u6b64\u8f6c\u6362\u5668\u7f16\u5199\u3002<br \/>\n * &#064;param clazz \u6d4b\u8bd5\u53ef\u5199\u6027\u7684\u7c7b<br \/>\n * &#064;param mediaType \u8981\u5199\u5165\u7684\u5a92\u4f53\u7c7b\u578b&#xff08;\u5982\u679c\u672a\u6307\u5b9a&#xff0c;\u5219\u53ef\u4ee5\u4e3anull&#xff09;&#xff1b;\u901a\u5e38\u662f\u62a5\u5934\u4e2d Accept \u5c5e\u6027\u7684\u503c\u3002<br \/>\n * &#064;return \u5982\u679c\u53ef\u5199&#xff0c;\u5219\u4e3atrue&#xff1b;\u5426\u5219\u4e3afalse<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">boolean<\/span> <span class=\"token function\">canWrite<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> clazz<span class=\"token punctuation\">,<\/span> <span class=\"token annotation punctuation\">&#064;Nullable<\/span> <span class=\"token class-name\">MediaType<\/span> mediaType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u8fd4\u56de\u6b64\u8f6c\u6362\u5668\u652f\u6301\u7684\u5a92\u4f53\u7c7b\u578b\u5217\u8868\u3002\u8be5\u5217\u8868\u53ef\u80fd\u4e0d\u9002\u7528\u4e8e\u6240\u6709\u53ef\u80fd\u7684\u76ee\u6807\u5143\u7d20\u7c7b\u578b&#xff0c;\u56e0\u6b64\u901a\u5e38\u5e94\u901a\u8fc7canWrite(clazz, null)\u65b9\u6cd5\u6765\u4fdd\u62a4\u5bf9\u6b64\u65b9\u6cd5\u7684\u8c03\u7528\u3002\u8be5\u5217\u8868\u53ef\u80fd\u8fd8\u4f1a\u6392\u9664\u4ec5\u7279\u5b9a\u7c7b\u652f\u6301\u7684MIME\u7c7b\u578b\u3002\u6216\u8005&#xff0c;\u4f7f\u7528getSupportedMediaTypes(Class)\u83b7\u53d6\u66f4\u7cbe\u786e\u7684\u5217\u8868\u3002<br \/>\n * &#064;return \u652f\u6301\u7684\u5a92\u4f53\u7c7b\u578b\u5217\u8868<br \/>\n *\/<\/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\">MediaType<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">getSupportedMediaTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u8fd4\u56de\u6b64\u8f6c\u6362\u5668\u9488\u5bf9\u7ed9\u5b9a\u7c7b\u652f\u6301\u7684\u5a92\u4f53\u7c7b\u578b\u5217\u8868\u3002\u5982\u679c\u8f6c\u6362\u5668\u4e0d\u652f\u6301\u7ed9\u5b9a\u7684\u7c7b&#xff0c;\u6216\u8005\u4ec5\u652f\u6301\u5176\u4e2d\u7684\u4e00\u90e8\u5206\u5a92\u4f53\u7c7b\u578b&#xff0c;\u5219\u8be5\u5217\u8868\u53ef\u80fd\u4e0egetSupportedMediaTypes()\u8fd4\u56de\u7684\u5217\u8868\u4e0d\u540c\u3002<br \/>\n * &#064;param clazz \u6307\u5b9a\u7684\u7c7b<br \/>\n * &#064;return \u7ed9\u5b9a\u7c7b\u652f\u6301\u7684\u5a92\u4f53\u7c7b\u578b\u5217\u8868<br \/>\n * &#064;since 5.3.4<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">default<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">MediaType<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">getSupportedMediaTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> clazz<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">canRead<\/span><span class=\"token punctuation\">(<\/span>clazz<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token function\">canWrite<\/span><span class=\"token punctuation\">(<\/span>clazz<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span><br \/>\n<span class=\"token function\">getSupportedMediaTypes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">emptyList<\/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 * \u4ece\u7ed9\u5b9a\u7684\u8f93\u5165\u6d88\u606f\u4e2d\u8bfb\u53d6\u7ed9\u5b9a\u7c7b\u578b\u7684\u5bf9\u8c61&#xff0c;\u5e76\u8fd4\u56de\u8be5\u5bf9\u8c61\u3002<br \/>\n * &#064;param clazz \u8981\u8fd4\u56de\u7684\u5bf9\u8c61\u7c7b\u578b\u3002\u6b64\u7c7b\u578b\u5fc5\u987b\u4e4b\u524d\u5df2\u4f20\u9012\u7ed9\u6b64\u63a5\u53e3\u7684canRead\u65b9\u6cd5&#xff0c;\u4e14\u8be5\u65b9\u6cd5\u5fc5\u987b\u8fd4\u56detrue\u3002<br \/>\n * &#064;param inputMessage \u8981\u8bfb\u53d6\u7684HTTP\u8f93\u5165\u6d88\u606f<br \/>\n * &#064;return \u8f6c\u6362\u540e\u7684\u5bf9\u8c61<br \/>\n * &#064;throws IOException \u5728\u53d1\u751fI\/O\u9519\u8bef\u7684\u60c5\u51b5\u4e0b<br \/>\n * &#064;throws HttpMessageNotReadableException \u4ee5\u9632\u51fa\u73b0\u8f6c\u6362\u9519\u8bef<br \/>\n *\/<\/span><br \/>\n<span class=\"token class-name\">T<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> clazz<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpInputMessage<\/span> inputMessage<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpMessageNotReadableException<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u5c06\u7ed9\u5b9a\u5bf9\u8c61\u5199\u5165\u7ed9\u5b9a\u7684\u8f93\u51fa\u6d88\u606f\u4e2d\u3002<br \/>\n * &#064;param t \u8981\u5199\u5165\u8f93\u51fa\u6d88\u606f\u7684\u5bf9\u8c61\u3002\u6b64\u5bf9\u8c61\u7684\u7c7b\u578b\u5fc5\u987b\u4e4b\u524d\u5df2\u4f20\u9012\u7ed9\u6b64\u63a5\u53e3\u7684canWrite\u65b9\u6cd5&#xff0c;\u4e14\u8be5\u65b9\u6cd5\u5fc5\u987b\u8fd4\u56detrue\u3002<br \/>\n * &#064;param contentType \u5199\u5165\u65f6\u8981\u4f7f\u7528\u7684\u5185\u5bb9\u7c7b\u578b\u3002\u53ef\u4ee5\u4e3a null&#xff0c;\u8868\u793a\u5fc5\u987b\u4f7f\u7528\u8f6c\u6362\u5668\u7684\u9ed8\u8ba4\u5185\u5bb9\u7c7b\u578b\u3002\u5982\u679c\u975e null&#xff0c;\u5219\u6b64\u5a92\u4f53\u7c7b\u578b\u5fc5\u987b\u4e4b\u524d\u5df2\u4f20\u9012\u7ed9\u6b64\u63a5\u53e3\u7684 canWrite \u65b9\u6cd5&#xff0c;\u4e14\u8be5\u65b9\u6cd5\u5fc5\u987b\u8fd4\u56de true\u3002<br \/>\n * &#064;param outputMessage \u8981\u5199\u7684\u4fe1\u606f<br \/>\n * &#064;throws IOException \u5728\u53d1\u751fI\/O\u9519\u8bef\u7684\u60c5\u51b5\u4e0b<br \/>\n * &#064;throws HttpMessageNotWritableException \u4ee5\u9632\u51fa\u73b0\u8f6c\u6362\u9519\u8bef<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">T<\/span> t<span class=\"token punctuation\">,<\/span> <span class=\"token annotation punctuation\">&#064;Nullable<\/span> <span class=\"token class-name\">MediaType<\/span> contentType<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpOutputMessage<\/span> outputMessage<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">HttpMessageNotWritableException<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<li>beforeBodyWrite \u5185\u90e8\u6ca1\u6709\u4e3b\u52a8\u8df3\u8fc7\u8fd9\u4e2a body\u3002supports \u53ea\u51b3\u5b9a\u201c\u5141\u4e0d\u5141\u8bb8\u8c03\u7528\u201d&#xff0c;\u4e0d\u51b3\u5b9a \u201c\u4e00\u5b9a\u4f1a\u6539\u5199\u201d\u3002<\/li>\n<p><span class=\"token comment\">\/**<br \/>\n * \u5141\u8bb8\u5728\u6267\u884c&#064;ResponseBody\u6216 ResponseEntity\u63a7\u5236\u5668\u65b9\u6cd5\u4e4b\u540e&#xff0c;<br \/>\n * \u4f46\u5728\u4f7f\u7528HttpMessageConverter\u5199\u5165\u54cd\u5e94\u4f53\u4e4b\u524d&#xff0c;\u81ea\u5b9a\u4e49\u54cd\u5e94\u3002<br \/>\n * \u5b9e\u73b0\u7c7b\u53ef\u4ee5\u76f4\u63a5\u6ce8\u518c\u5230 RequestMappingHandlerAdapter\u548c ExceptionHandlerExceptionResolver\u4e2d&#xff0c;<br \/>\n * \u6216\u8005\u66f4\u5e38\u89c1\u7684\u662f\u4f7f\u7528 &#064;ControllerAdvice\u8fdb\u884c\u6ce8\u89e3&#xff0c;\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b&#xff0c;\u5b83\u4eec\u5c06\u88ab\u4e24\u8005\u81ea\u52a8\u68c0\u6d4b\u5230\u3002<br \/>\n * &#064;author Rossen Stoyanchev<br \/>\n * &#064;since 4.1<br \/>\n * &#064;param &lt;T&gt; \u54cd\u5e94\u4f53\u7c7b\u578b<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">ResponseBodyAdvice<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u6b64\u7ec4\u4ef6\u662f\u5426\u652f\u6301\u7ed9\u5b9a\u7684Controller\u65b9\u6cd5\u8fd4\u56de\u7c7b\u578b\u548c\u6240\u9009\u7684 HttpMessageConverter\u7c7b\u578b\u3002<br \/>\n * &#064;param returnType \u8fd4\u56de\u7684\u7c7b\u578b<br \/>\n * &#064;param converterType \u6240\u9009\u7684 HttpMessageConverter\u7c7b\u578b<br \/>\n * &#064;return \u5982\u679c\u5e94\u8be5\u8c03\u7528beforeBodyWrite&#xff0c;\u5219\u4e3atrue&#xff1b;\u5426\u5219\u4e3afalse<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">boolean<\/span> <span class=\"token function\">supports<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MethodParameter<\/span> returnType<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpMessageConverter<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> converterType<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/**<br \/>\n * \u5728\u9009\u62e9\u4e86HttpMessageConverter\u4e4b\u540e&#xff0c;\u4e14\u5728\u5176write\u65b9\u6cd5\u88ab\u8c03\u7528\u4e4b\u524d\u8c03\u7528\u3002<br \/>\n * &#064;param body \u8981\u88ab\u5199\u5165\u7684\u54cd\u5e94\u4f53<br \/>\n * &#064;param returnType Controller\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b<br \/>\n * &#064;param selectedContentType \u901a\u8fc7\u5185\u5bb9\u534f\u5546\u9009\u62e9\u7684\u5185\u5bb9\u7c7b\u578b<br \/>\n * &#064;param selectedConverterType \u9009\u62e9\u5199\u5165\u54cd\u5e94\u7684\u8f6c\u6362\u5668\u7c7b\u578b<br \/>\n * &#064;param request \u5f53\u524d\u8bf7\u6c42<br \/>\n * &#064;param response \u5f53\u524d\u54cd\u5e94<br \/>\n * &#064;return \u88ab\u4f20\u5165\u7684\u5b9e\u4f53\u6216\u4e00\u4e2a\u4fee\u6539\u540e\u7684&#xff08;\u53ef\u80fd\u662f\u65b0\u7684&#xff09;\u5b9e\u4f8b<br \/>\n *\/<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Nullable<\/span><br \/>\n<span class=\"token class-name\">T<\/span> <span class=\"token function\">beforeBodyWrite<\/span><span class=\"token punctuation\">(<\/span><span class=\"token annotation punctuation\">&#064;Nullable<\/span> <span class=\"token class-name\">T<\/span> body<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">MethodParameter<\/span> returnType<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">MediaType<\/span> selectedContentType<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">HttpMessageConverter<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> selectedConverterType<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token class-name\">ServerHttpRequest<\/span> request<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ServerHttpResponse<\/span> response<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.3 \u4e3a\u4ec0\u4e48\u8fd4\u56de String \u65f6\u4f1a\u62a5 ClassCastException<\/h3>\n<p>\u5982\u679c\u4f60\u76f4\u63a5\u8ba9 beforeBodyWrite \u65e0\u5dee\u522b\u5730 return Result.success(body)&#xff0c;\u8bbf\u95ee\u4e00\u4e2a\u8fd4\u56de String \u7684\u63a5\u53e3\u65f6&#xff0c;\u4f1a\u9047\u5230&#xff1a;<\/p>\n<p>java.lang.ClassCastException: Result cannot be cast to java.lang.String<\/p>\n<p>\u539f\u56e0\u85cf\u5728 SpringMVC \u7684 HttpMessageConverter \u94fe\u91cc\u3002\u9ed8\u8ba4\u6ce8\u518c\u7684\u8f6c\u6362\u5668\u987a\u5e8f\u4e2d&#xff0c;StringHttpMessageConverter \u6392\u5728 MappingJackson2HttpMessageConverter \u4e4b\u524d\u3002\u5f53\u539f\u59cb\u8fd4\u56de\u7c7b\u578b\u662f String \u65f6&#xff0c;Spring \u4f1a\u9009\u4e2d StringHttpMessageConverter \u6765\u5199\u51fa\u54cd\u5e94&#xff1b;\u800c\u8fd9\u4e2a\u8f6c\u6362\u5668\u5728 addDefaultHeaders \u4e2d\u671f\u671b\u6536\u5230\u7684\u662f String \u7c7b\u578b\u3002\u4f60\u7684 beforeBodyWrite \u5374\u628a String \u5305\u88c5\u6210\u4e86 Result&#xff0c;\u4e8e\u662f\u7c7b\u578b\u4e0d\u5339\u914d&#xff0c;\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n<p>\u4fee\u590d\u65b9\u5f0f\u5c31\u662f\u4e0a\u9762\u7684\u4ee3\u7801&#xff1a; \u5728 beforeBodyWrite \u4e2d\u5355\u72ec\u5224\u65ad body instanceof String&#xff0c;\u5148\u7528 Jackson \u624b\u52a8\u628a Result \u5e8f\u5217\u5316\u6210 JSON \u5b57\u7b26\u4e32\u518d\u8fd4\u56de&#xff0c;\u8fd9\u6837 StringHttpMessageConverter \u62ff\u5230\u7684\u4ecd\u7136\u662f\u5408\u6cd5\u7684 String\u3002\u540c\u65f6\u589e\u52a0 body instanceof Result \u7684\u5224\u65ad&#xff0c;\u907f\u514d\u5bf9\u5df2\u7ecf\u624b\u52a8\u5305\u88c5\u8fc7\u7684\u8fd4\u56de\u503c\u8fdb\u884c\u4e8c\u6b21\u5305\u88c5&#xff08;\u5426\u5219\u524d\u7aef\u4f1a\u6536\u5230 {&#034;status&#034;:&#034;SUCCESS&#034;,&#034;data&#034;:{&#034;status&#034;:&#034;SUCCESS&#034;,&#034;data&#034;:&#8230;}} \u8fd9\u6837\u7684\u5d4c\u5957\u7ed3\u6784&#xff09;\u3002<\/p>\n<h3>2.4 \u4e00\u4e2a\u503c\u5f97\u77e5\u9053\u7684\u6743\u8861<\/h3>\n<p>ResponseBodyAdvice \u81ea\u52a8\u5305\u88c5\u7684\u4f18\u70b9\u662f \u201c\u96f6\u4fb5\u5165\u201d&#xff1a;Controller \u5b8c\u5168\u4e0d\u9700\u8981\u611f\u77e5 Result \u7684\u5b58\u5728\u3002\u4f46\u5b83\u4e5f\u6709\u4ee3\u4ef7\u2014\u2014Controller \u7684\u65b9\u6cd5\u7b7e\u540d\u4e2d\u770b\u4e0d\u51fa\u6765\u6700\u7ec8\u8fd4\u56de\u7ed3\u6784&#xff0c;\u5bf9\u4e8e\u9700\u8981\u6587\u4ef6\u4e0b\u8f7d\u3001\u6d41\u5f0f\u54cd\u5e94\u3001Swagger \u6587\u6863\u7b49\u573a\u666f&#xff0c;\u81ea\u52a8\u5305\u88c5\u53cd\u800c\u4f1a\u9020\u6210\u5e72\u6270\u3002\u5728\u4e2d\u5c0f\u578b\u9879\u76ee\u4e2d&#xff0c;\u81ea\u52a8\u5305\u88c5\u662f\u9ad8\u6548\u7684&#xff1b;\u5728\u5927\u578b\u6216\u5bf9\u5916 API \u9879\u76ee\u4e2d&#xff0c;\u4e0d\u5c11\u56e2\u961f\u4f1a\u9009\u62e9\u624b\u52a8\u8fd4\u56de Result&lt;T&gt;&#xff0c;\u4ee5\u83b7\u5f97\u66f4\u5f3a\u7684\u7c7b\u578b\u53ef\u89c1\u6027\u548c\u63a7\u5236\u529b\u3002<\/p>\n<h2>3. \u7edf\u4e00\u5f02\u5e38\u5904\u7406&#xff1a;\u4e0d\u8ba9\u5f02\u5e38\u201c\u88f8\u5954\u201d\u5230\u524d\u7aef<\/h2>\n<h3>3.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u5168\u5c40\u5f02\u5e38\u5904\u7406<\/h3>\n<p>\u6ca1\u6709\u7edf\u4e00\u5f02\u5e38\u5904\u7406\u65f6&#xff0c;Controller \u91cc\u4efb\u4f55\u4e00\u4e2a\u672a\u6355\u83b7\u7684\u5f02\u5e38\u90fd\u4f1a\u8ba9\u524d\u7aef\u6536\u5230\u4e00\u4e2a 500 \u54cd\u5e94&#xff0c;\u54cd\u5e94\u4f53\u53ef\u80fd\u662f Spring \u9ed8\u8ba4\u7684\u9519\u8bef\u9875\u6216\u4e00\u957f\u4e32 Java \u5806\u6808\u3002\u8fd9\u4e0d\u4ec5\u4e0d\u53cb\u597d&#xff0c;\u8fd8\u53ef\u80fd\u628a\u5185\u90e8\u7c7b\u540d\u3001SQL \u7247\u6bb5\u7b49\u654f\u611f\u4fe1\u606f\u66b4\u9732\u7ed9\u5916\u90e8\u3002\u7edf\u4e00\u5f02\u5e38\u5904\u7406\u7684\u76ee\u6807\u662f&#xff1a;\u6240\u6709\u5f02\u5e38\u90fd\u88ab\u8f6c\u6362\u6210\u4e0e\u6b63\u5e38\u8fd4\u56de\u7ed3\u6784\u4e00\u81f4\u7684 Result \u5bf9\u8c61&#xff0c;\u524d\u7aef\u53ea\u9700\u6309\u540c\u4e00\u5957\u903b\u8f91\u89e3\u6790\u3002<\/p>\n<h3>3.2 \u5feb\u901f\u5165\u95e8&#xff1a;&#064;ControllerAdvice &#043; &#064;ExceptionHandler<\/h3>\n<p><span class=\"token annotation punctuation\">&#064;RestControllerAdvice<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">GlobalExceptionHandler<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;ExceptionHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Result<\/span> <span class=\"token function\">handleException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">fail<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/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>&#064;RestControllerAdvice \u7b49\u4ef7\u4e8e &#064;ControllerAdvice &#043; &#064;ResponseBody&#xff0c;\u8fd9\u610f\u5473\u7740\u5904\u7406\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u4f1a\u81ea\u52a8\u88ab\u5e8f\u5217\u5316\u4e3a JSON&#xff0c;\u9002\u5408\u524d\u540e\u7aef\u5206\u79bb\u9879\u76ee\u3002\u5982\u679c\u4f60\u8fd4\u56de\u7684\u662f\u89c6\u56fe\u9875\u9762\u800c\u4e0d\u662f JSON&#xff0c;\u624d\u9700\u8981\u4f7f\u7528 &#064;ControllerAdvice \u5e76\u5728\u65b9\u6cd5\u4e0a\u5355\u72ec\u52a0 &#064;ResponseBody\u3002<\/p>\n<h3>3.3 \u5206\u5c42\u6355\u83b7&#xff1a;\u7cbe\u786e\u5f02\u5e38\u4f18\u5148&#xff0c;Exception \u515c\u5e95<\/h3>\n<p>\u4e00\u4e2a\u5065\u58ee\u7684\u5f02\u5e38\u5904\u7406\u5668\u4e0d\u4f1a\u53ea\u6709\u4e00\u4e2a \u201c\u4e07\u80fd\u201d \u65b9\u6cd5\u3002&#064;ExceptionHandler \u7684\u5339\u914d\u89c4\u5219\u662f\u5f53\u524d\u5f02\u5e38\u7c7b\u578b\u53ca\u5176\u5b50\u7c7b\u5411\u4e0a\u5339\u914d&#xff1a;\u5982\u679c\u629b\u51fa\u7684\u5f02\u5e38\u540c\u65f6\u80fd\u88ab\u591a\u4e2a\u65b9\u6cd5\u5904\u7406&#xff0c;Spring \u4f1a\u9009\u62e9\u58f0\u660e\u7c7b\u578b\u4e0e\u629b\u51fa\u7c7b\u578b\u6700\u201c\u8fd1\u201d\u7684\u90a3\u4e2a\u3002\u4f8b\u5982\u629b\u51fa\u4e00\u4e2a NullPointerException&#xff0c;handler(NullPointerException e) \u7684\u5339\u914d\u6df1\u5ea6\u4e3a 0&#xff0c;handler(Exception e) \u7684\u5339\u914d\u6df1\u5ea6\u4e3a 2&#xff0c;\u56e0\u6b64\u7cbe\u786e\u5339\u914d\u7684\u65b9\u6cd5\u4f18\u5148\u6267\u884c\u3002<\/p>\n<p>\u57fa\u4e8e\u8fd9\u4e2a\u89c4\u5219&#xff0c;\u63a8\u8350\u7684\u7ec4\u7ec7\u65b9\u5f0f\u662f&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;RestControllerAdvice<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Slf4j<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">GlobalExceptionHandler<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4e1a\u52a1\u5f02\u5e38&#xff1a;\u53ef\u9884\u671f&#xff0c;\u8fd4\u56de\u5177\u4f53\u63d0\u793a<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;ExceptionHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BusinessException<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Result<\/span> <span class=\"token function\">handleBusiness<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BusinessException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">warn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e1a\u52a1\u5f02\u5e38: code&#061;{}, msg&#061;{}&#034;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/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 keyword\">return<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">fail<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMessage<\/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\">\/\/ \u53c2\u6570\u6821\u9a8c\u5f02\u5e38<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;ExceptionHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MethodArgumentNotValidException<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Result<\/span> <span class=\"token function\">handleValidation<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MethodArgumentNotValidException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> msg <span class=\"token operator\">&#061;<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBindingResult<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getFieldError<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getDefaultMessage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">fail<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;PARAM_INVALID&#034;<\/span><span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u515c\u5e95&#xff1a;\u975e\u9884\u671f\u5f02\u5e38&#xff0c;\u9690\u85cf\u7ec6\u8282&#xff0c;\u8bb0\u5f55\u5b8c\u6574\u5806\u6808<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;ExceptionHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Result<\/span> <span class=\"token function\">handleUnexpected<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u672a\u9884\u671f\u5f02\u5e38&#034;<\/span><span class=\"token punctuation\">,<\/span> e<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">fail<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7cfb\u7edf\u7e41\u5fd9&#xff0c;\u8bf7\u7a0d\u540e\u518d\u8bd5&#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>\u4e1a\u52a1\u5f02\u5e38&#xff08;\u5982\u201c\u7528\u6237\u4e0d\u5b58\u5728\u201d\u201c\u4f59\u989d\u4e0d\u8db3\u201d&#xff09;\u5e94\u8be5\u8fd4\u56de\u7ed9\u7528\u6237\u53ef\u8bfb\u7684\u63d0\u793a&#xff1b;\u975e\u9884\u671f\u7684\u7cfb\u7edf\u5f02\u5e38\u5219\u53ea\u8bb0\u5f55\u65e5\u5fd7&#xff0c;\u5bf9\u5916\u8fd4\u56de\u6a21\u7cca\u7684\u53cb\u597d\u4fe1\u606f&#xff0c;\u907f\u514d\u4fe1\u606f\u6cc4\u9732\u3002\u8fd9\u4e0e\u524d\u7aef\u7684\u914d\u5408\u4e5f\u5f88\u5173\u952e&#xff1a;\u524d\u7aef\u53ea\u9700\u8981\u5224\u65ad result.status \u662f\u5426\u6210\u529f&#xff0c;\u5931\u8d25\u65f6\u5c55\u793a errorMessage&#xff0c;\u4e0d\u9700\u8981\u533a\u5206\u80cc\u540e\u662f\u4e1a\u52a1\u5f02\u5e38\u8fd8\u662f\u7cfb\u7edf\u5f02\u5e38\u3002<\/p>\n<h2>4. \u6e90\u7801\u8109\u7edc&#xff1a;DispatcherServlet \u4e0e &#064;ControllerAdvice \u7684\u534f\u4f5c<\/h2>\n<p>\u7406\u89e3\u4e0a\u9762\u4e09\u9879\u529f\u80fd\u5171\u4eab\u540c\u4e00\u4e2a\u6838\u5fc3\u5165\u53e3\u2014\u2014DispatcherServlet&#xff0c;\u6709\u52a9\u4e8e\u4f60\u5728\u9047\u5230 \u201c\u62e6\u622a\u5668\u6ca1\u751f\u6548\u201d\u3001\u201c\u5f02\u5e38\u5904\u7406\u6ca1\u89e6\u53d1\u201d \u65f6\u5feb\u901f\u5b9a\u4f4d\u95ee\u9898\u3002<\/p>\n<p>\u6240\u6709\u8bf7\u6c42\u90fd\u4f1a\u5148\u8fdb\u5165 DispatcherServlet \u7684 doDispatch \u65b9\u6cd5\u3002\u5b83\u7684\u4e3b\u5e72\u6d41\u7a0b\u662f&#xff1a;<\/p>\n<li>\u901a\u8fc7 HandlerMapping \u627e\u5230\u5f53\u524d\u8bf7\u6c42\u5bf9\u5e94\u7684 HandlerExecutionChain&#xff08;\u5305\u542b Handler \u548c\u62e6\u622a\u5668\u94fe&#xff09;&#xff1b;<\/li>\n<li>\u901a\u8fc7 HandlerAdapter \u9002\u914d\u5e76\u51c6\u5907\u6267\u884c Handler&#xff1b;<\/li>\n<li>\u6267\u884c applyPreHandle&#xff0c;\u4f9d\u6b21\u8c03\u7528\u62e6\u622a\u5668\u7684 preHandle&#xff1b;<\/li>\n<li>\u6267\u884c Controller \u65b9\u6cd5&#xff1b;<\/li>\n<li>\u6267\u884c\u62e6\u622a\u5668\u7684 postHandle&#xff1b;<\/li>\n<li>\u5904\u7406\u89c6\u56fe\u6216\u54cd\u5e94&#xff0c;\u6700\u540e\u89e6\u53d1 afterCompletion\u3002<\/li>\n<p>&#064;ControllerAdvice \u7684\u4e24\u4e2a\u5206\u652f\u5206\u522b\u6302\u5728\u8fd9\u6761\u4e3b\u5e72\u7684\u7279\u5b9a\u73af\u8282\u4e0a&#xff1a;<\/p>\n<li>ResponseBodyAdvice \u5206\u652f&#xff1a;RequestMappingHandlerAdapter \u5728\u542f\u52a8\u65f6\u4f1a\u626b\u63cf\u6240\u6709 &#064;ControllerAdvice Bean&#xff0c;\u628a\u5b9e\u73b0\u4e86 ResponseBodyAdvice \u7684 Bean \u6536\u96c6\u5230 requestResponseBodyAdvice \u5217\u8868\u4e2d\u3002\u5f53 Controller \u8fd4\u56de\u503c\u9700\u8981\u5199\u51fa\u65f6&#xff0c;AbstractMessageConverterMethodProcessor.writeWithMessageConverters \u4f1a\u904d\u5386\u8fd9\u4e9b Advice&#xff0c;\u8c03\u7528 beforeBodyWrite&#xff0c;\u8fd9\u6b63\u662f\u81ea\u52a8\u5305\u88c5\u7684\u5207\u5165\u70b9\u3002<\/li>\n<li>ExceptionHandler \u5206\u652f&#xff1a;DispatcherServlet \u521d\u59cb\u5316\u65f6\u4f1a\u521b\u5efa ExceptionHandlerExceptionResolver&#xff0c;\u5b83\u540c\u6837\u626b\u63cf &#064;ControllerAdvice Bean&#xff0c;\u5e76\u901a\u8fc7 ExceptionHandlerMethodResolver \u5efa\u7acb \u201c\u5f02\u5e38\u7c7b\u578b \u2192 \u5904\u7406\u65b9\u6cd5\u201d \u7684\u6620\u5c04\u3002\u5f53 Controller \u629b\u51fa\u5f02\u5e38\u65f6&#xff0c;Resolver \u6309\u5339\u914d\u6df1\u5ea6\u6392\u5e8f&#xff0c;\u9009\u51fa\u6700\u7cbe\u786e\u7684 &#064;ExceptionHandler \u65b9\u6cd5\u6267\u884c\u3002<\/li>\n<p>\u8fd9\u4e24\u4e2a\u5206\u652f\u7684\u89e6\u53d1\u65f6\u673a\u4e0d\u540c&#xff1a;ResponseBodyAdvice \u5728 \u6b63\u5e38\u8fd4\u56de\u8def\u5f84 \u4e0a\u751f\u6548&#xff0c;&#064;ExceptionHandler \u5728 \u5f02\u5e38\u8def\u5f84 \u4e0a\u751f\u6548\u3002\u5982\u679c\u4f60\u7684\u7edf\u4e00\u5f02\u5e38\u5904\u7406\u8fd4\u56de\u7684 Result \u53c8\u88ab ResponseBodyAdvice \u5305\u88c5\u4e86\u4e00\u5c42&#xff0c;\u5c31\u4f1a\u4ea7\u751f\u5d4c\u5957\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48 beforeBodyWrite \u4e2d\u9700\u8981\u5224\u65ad body instanceof Result \u5e76\u76f4\u63a5\u8fd4\u56de\u2014\u2014\u6b63\u5e38\u8def\u5f84\u548c\u5f02\u5e38\u8def\u5f84\u7684\u8fd4\u56de\u503c\u6700\u7ec8\u6c47\u5165\u540c\u4e00\u4e2a\u5199\u51fa\u73af\u8282&#xff0c;\u5fc5\u987b\u907f\u514d\u91cd\u590d\u5305\u88c5\u3002<\/p>\n<h2>5. \u524d\u7aef Ajax \u914d\u5408\u6539\u9020<\/h2>\n<p>\u540e\u7aef\u7edf\u4e00\u4e4b\u540e&#xff0c;\u524d\u7aef\u4e5f\u9700\u8981\u505a\u76f8\u5e94\u8c03\u6574\u3002\u6838\u5fc3\u53d8\u5316\u53ea\u6709\u4e24\u70b9&#xff1a;\u54cd\u5e94\u4f53\u7ed3\u6784\u53d8\u4e86&#xff0c;\u4ee5\u53ca\u672a\u767b\u5f55\u65f6 HTTP \u72b6\u6001\u7801\u662f 401\u3002<\/p>\n<p>\u5bf9\u4e8e 401&#xff0c;Ajax \u7684 error \u56de\u8c03\u7edf\u4e00\u5904\u7406&#xff1a;<\/p>\n<p><span class=\"token function-variable function\">error<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">xhr<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>xhr<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token number\">401<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u767b\u5f55\u5df2\u5931\u6548&#xff0c;\u8bf7\u91cd\u65b0\u767b\u5f55&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        location<span class=\"token punctuation\">.<\/span>href <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;login.html&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5bf9\u4e8e \u6210\u529f\u54cd\u5e94&#xff0c;\u524d\u7aef\u4e0d\u518d\u76f4\u63a5\u4ece\u9876\u5c42\u5b57\u6bb5\u8bfb\u53d6\u4e1a\u52a1\u6570\u636e&#xff0c;\u800c\u662f\u5148\u5224\u65ad result.status&#xff0c;\u518d\u4ece result.data \u4e2d\u53d6\u6570\u636e&#xff1a;<\/p>\n<p><span class=\"token function-variable function\">success<\/span><span class=\"token operator\">:<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token parameter\">result<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>status <span class=\"token operator\">&#061;&#061;&#061;<\/span> <span class=\"token string\">&#034;SUCCESS&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">var<\/span> bookList <span class=\"token operator\">&#061;<\/span> result<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u771f\u6b63\u7684\u4e1a\u52a1\u6570\u636e\u5728 data \u91cc<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6e32\u67d3\u9875\u9762\u2026\u2026<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">.<\/span>errorMessage<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>\u767b\u5f55\u63a5\u53e3\u7684\u8fd4\u56de\u503c\u4e5f\u4f1a\u88ab\u7edf\u4e00\u5305\u88c5&#xff0c;\u56e0\u6b64\u524d\u7aef\u5224\u65ad\u767b\u5f55\u662f\u5426\u6210\u529f\u7684\u6761\u4ef6\u4ece\u539f\u6765\u7684 result &#061;&#061;&#061; true \u53d8\u4e3a result.status &#061;&#061;&#061; &#034;SUCCESS&#034; &amp;&amp; result.data &#061;&#061;&#061; true\u3002\u8fd9\u4e00\u6b65\u770b\u8d77\u6765\u5fae\u5c0f&#xff0c;\u5374\u662f\u524d\u540e\u7aef\u5951\u7ea6\u5bf9\u9f50\u7684\u5173\u952e&#xff1a;\u540e\u7aef\u6240\u6709\u63a5\u53e3\u65e0\u8bba\u6b63\u5e38\u8fd8\u662f\u5f02\u5e38&#xff0c;\u524d\u7aef\u6c38\u8fdc\u9762\u5bf9\u540c\u4e00\u79cd JSON \u7ed3\u6784\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u672c\u6587\u8986\u76d6\u7684\u4e09\u9879\u80fd\u529b&#xff0c;\u672c\u8d28\u4e0a\u662f\u5728\u89e3\u51b3\u540c\u4e00\u4e2a\u95ee\u9898&#xff1a;\u628a\u4e0e\u4e1a\u52a1\u65e0\u5173\u7684\u6a2a\u5207\u5173\u6ce8\u70b9\u4ece Controller \u4e2d\u62bd\u79bb&#xff0c;\u7528\u6846\u67b6\u7684\u7edf\u4e00\u5165\u53e3\u96c6\u4e2d\u5904\u7406\u3002<\/p>\n<li>\u62e6\u622a\u5668&#xff1a;\u5728 preHandle \u4e2d\u5b8c\u6210\u767b\u5f55\u6821\u9a8c&#xff0c;\u7528 excludePathPatterns \u7cbe\u786e\u63a7\u5236\u653e\u884c\u8303\u56f4&#xff1b;\u6ce8\u610f\u5f02\u6b65\u8bf7\u6c42\u4e0b postHandle\/afterCompletion \u7684\u8c03\u7528\u65f6\u673a\u5dee\u5f02\u3002<\/li>\n<li>\u7edf\u4e00\u6570\u636e\u8fd4\u56de &#xff1a;&#064;ControllerAdvice &#043; ResponseBodyAdvice \u5728\u54cd\u5e94\u5199\u51fa\u524d\u81ea\u52a8\u5305\u88c5&#xff0c;\u4f46\u5fc5\u987b\u5355\u72ec\u5904\u7406 String \u7c7b\u578b&#xff0c;\u5426\u5219\u4f1a\u56e0 StringHttpMessageConverter 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