\u4eca\u5929\u6211\u4eec\u5c06\u7814\u7a76Servlet\u5f02\u5e38\u548c\u9519\u8bef\u5904\u7406\u3002\u4e4b\u524d\u6211\u5199\u8fc7\u4e00\u7bc7\u5173\u4e8eJava\u5f02\u5e38\u5904\u7406\u7684\u6587\u7ae0\uff0c\u4f46\u5728\u5904\u7406Web\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u9700\u8981\u66f4\u591a\u7684\u5f02\u5e38\u5904\u7406\u5de5\u4f5c\u3002<\/p>\n
\u5982\u679c\u4f60\u6ce8\u610f\u5230\u7684\u8bdd\uff0cdoGet()\u548cdoPost()\u65b9\u6cd5\u4f1a\u629b\u51fajavax.servlet.ServletException\u548cIOException\u5f02\u5e38\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u5f53\u6211\u4eec\u4ece\u5e94\u7528\u7a0b\u5e8f\u4e2d\u629b\u51fa\u8fd9\u4e9b\u5f02\u5e38\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002\u6211\u5c06\u7f16\u5199\u4e00\u4e2a\u7b80\u5355\u7684servlet\u6765\u629b\u51faServletException\u3002<\/p>\n
package com.Olivia.servlet.exception;\r\n\r\nimport java.io.IOException;\r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.annotation.WebServlet;\r\nimport javax.servlet.http.HttpServlet;\r\nimport javax.servlet.http.HttpServletRequest;\r\nimport javax.servlet.http.HttpServletResponse;\r\n\r\n@WebServlet(\"\/MyExceptionServlet\")\r\npublic class MyExceptionServlet extends HttpServlet {\r\n\tprivate static final long serialVersionUID = 1L;\r\n\r\n\tprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\t\tthrow new ServletException(\"GET method is not supported.\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u73b0\u5728\u5f53\u6211\u4eec\u901a\u8fc7\u6d4f\u89c8\u5668\u4f7f\u7528GET\u65b9\u6cd5\u8c03\u7528\u8fd9\u4e2aservlet\u65f6\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u5982\u4e0b\u56fe\u6240\u793a\u7684\u54cd\u5e94\u3002\u7531\u4e8e\u6d4f\u89c8\u5668\u53ea\u80fd\u7406\u89e3HTML\uff0c\u5f53\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u629b\u51fa\u5f02\u5e38\u65f6\uff0cservlet\u5bb9\u5668\u4f1a\u5904\u7406\u8fd9\u4e2a\u5f02\u5e38\u5e76\u751f\u6210\u4e00\u4e2aHTML\u54cd\u5e94\u3002\u8fd9\u4e2a\u903b\u8f91\u662f\u7279\u5b9a\u4e8eservlet\u5bb9\u5668\u7684\u3002\u6211\u6b63\u5728\u4f7f\u7528Tomcat\u5e76\u6536\u5230\u8fd9\u4e2a\u9519\u8bef\u9875\u9762\u3002\u5982\u679c\u60a8\u4f7f\u7528\u5176\u4ed6\u670d\u52a1\u5668\uff0c\u5982JBoss\u6216Glassfish\uff0c\u60a8\u53ef\u80fd\u4f1a\u5f97\u5230\u4e0d\u540c\u7684\u9519\u8befHTML\u54cd\u5e94\u3002\u8fd9\u4e2a\u54cd\u5e94\u7684\u95ee\u9898\u662f\u5b83\u5bf9\u7528\u6237\u6765\u8bf4\u6ca1\u6709\u4efb\u4f55\u4ef7\u503c\u3002\u5b83\u5411\u7528\u6237\u5c55\u793a\u4e86\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u7c7b\u548c\u670d\u52a1\u5668\u8be6\u7ec6\u4fe1\u606f\uff0c\u5bf9\u7528\u6237\u6765\u8bf4\u6beb\u65e0\u610f\u4e49\uff0c\u4ece\u5b89\u5168\u7684\u89d2\u5ea6\u6765\u770b\u4e5f\u4e0d\u597d\u3002<\/p>\n
Servlet\u9519\u8bef<\/h3>\n
\u6211\u786e\u5b9a\u4f60\u5728\u5c1d\u8bd5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684URL\u65f6\u4e00\u5b9a\u89c1\u8fc7404\u9519\u8bef\u3002\u8ba9\u6211\u4eec\u770b\u770b\u6211\u4eec\u7684Servlet\u5bb9\u5668\u5bf9404\u9519\u8bef\u505a\u51fa\u7684\u54cd\u5e94\u3002\u5982\u679c\u6211\u4eec\u53d1\u9001\u5bf9\u4e00\u4e2a\u65e0\u6548URL\u7684\u8bf7\u6c42\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u7c7b\u4f3c\u4e0b\u65b9\u56fe\u7247\u6240\u793a\u7684\u54cd\u5e94HTML\u3002\u518d\u6b21\u5f3a\u8c03\uff0c\u8fd9\u662f\u670d\u52a1\u5668\u6839\u636e\u6211\u4eec\u7684\u5e94\u7528\u751f\u6210\u7684\u901a\u7528HTML\uff0c\u5bf9\u7528\u6237\u6765\u8bf4\u51e0\u4e4e\u6ca1\u6709\u4ec0\u4e48\u4ef7\u503c\u3002<\/p>\n
Servlet\u5f02\u5e38\u548c\u9519\u8bef\u5904\u7406<\/h3>\n
Servlet API\u63d0\u4f9b\u4e86\u5bf9\u81ea\u5b9a\u4e49\u5f02\u5e38\u548c\u9519\u8bef\u5904\u7406servlet\u7684\u652f\u6301\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u90e8\u7f72\u63cf\u8ff0\u7b26\u4e2d\u8fdb\u884c\u914d\u7f6e\u3002\u8fd9\u4e9bservlet\u7684\u6574\u4e2a\u76ee\u7684\u662f\u5904\u7406\u5e94\u7528\u7a0b\u5e8f\u5f15\u53d1\u7684\u5f02\u5e38\u6216\u9519\u8bef\uff0c\u5e76\u5411\u7528\u6237\u53d1\u9001\u6709\u7528\u7684HTML\u54cd\u5e94\u3002\u6211\u4eec\u53ef\u4ee5\u63d0\u4f9b\u5e94\u7528\u7a0b\u5e8f\u4e3b\u9875\u7684\u94fe\u63a5\u6216\u4e00\u4e9b\u8be6\u7ec6\u4fe1\u606f\uff0c\u8ba9\u7528\u6237\u77e5\u9053\u51fa\u4e86\u4ec0\u4e48\u95ee\u9898\u3002\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5f02\u5e38\u548c\u9519\u8bef\u5904\u7406servlet\u3002\u6211\u4eec\u53ef\u4ee5\u4e3a\u5e94\u7528\u7a0b\u5e8f\u521b\u5efa\u591a\u4e2a\u5f02\u5e38\u548c\u9519\u8bef\u5904\u7406servlet\uff0c\u4f46\u4e3a\u4e86\u7b80\u5355\u8d77\u89c1\uff0c\u6211\u5c06\u521b\u5efa\u4e00\u4e2a\u5355\u72ec\u7684servlet\u5e76\u5c06\u5176\u7528\u4e8e\u5f02\u5e38\u548c\u9519\u8bef\u3002AppExceptionHandler.java<\/p>\n
package com.Olivia.servlet.exception;\r\n\r\nimport java.io.IOException;\r\nimport java.io.PrintWriter;\r\n\r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.annotation.WebServlet;\r\nimport javax.servlet.http.HttpServlet;\r\nimport javax.servlet.http.HttpServletRequest;\r\nimport javax.servlet.http.HttpServletResponse;\r\n\r\n@WebServlet(\"\/AppExceptionHandler\")\r\npublic class AppExceptionHandler extends HttpServlet {\r\n\tprivate static final long serialVersionUID = 1L;\r\n\r\n\tprotected void doGet(HttpServletRequest request,\r\n\t\t\tHttpServletResponse response) throws ServletException, IOException {\r\n\t\tprocessError(request, response);\r\n\t}\r\n\r\n\tprotected void doPost(HttpServletRequest request,\r\n\t\t\tHttpServletResponse response) throws ServletException, IOException {\r\n\t\tprocessError(request, response);\r\n\t}\r\n\r\n\tprivate void processError(HttpServletRequest request,\r\n\t\t\tHttpServletResponse response) throws IOException {\r\n\t\t\/\/ Analyze the servlet exception\r\n\t\tThrowable throwable = (Throwable) request\r\n\t\t\t\t.getAttribute(\"javax.servlet.error.exception\");\r\n\t\tInteger statusCode = (Integer) request\r\n\t\t\t\t.getAttribute(\"javax.servlet.error.status_code\");\r\n\t\tString servletName = (String) request\r\n\t\t\t\t.getAttribute(\"javax.servlet.error.servlet_name\");\r\n\t\tif (servletName == null) {\r\n\t\t\tservletName = \"Unknown\";\r\n\t\t}\r\n\t\tString requestUri = (String) request\r\n\t\t\t\t.getAttribute(\"javax.servlet.error.request_uri\");\r\n\t\tif (requestUri == null) {\r\n\t\t\trequestUri = \"Unknown\";\r\n\t\t}\r\n\t\t\r\n\t\t\/\/ Set response content type\r\n\t response.setContentType(\"text\/html\");\r\n\t \r\n\t PrintWriter out = response.getWriter();\r\n\t out.write(\"<html><head><title>Exception\/Error Details<\/title><\/head><body>\");\r\n\t if(statusCode != 500){\r\n\t \t out.write(\"<h3>Error Details<\/h3>\");\r\n\t \t out.write(\"<strong>Status Code<\/strong>:\"+statusCode+\"<br>\");\r\n\t \t out.write(\"<strong>Requested URI<\/strong>:\"+requestUri);\r\n\t }else{\r\n\t \t out.write(\"<h3>Exception Details<\/h3>\");\r\n\t \t out.write(\"<ul><li>Servlet Name:\"+servletName+\"<\/li>\");\r\n\t \t out.write(\"<li>Exception Name:\"+throwable.getClass().getName()+\"<\/li>\");\r\n\t \t out.write(\"<li>Requested URI:\"+requestUri+\"<\/li>\");\r\n\t \t out.write(\"<li>Exception Message:\"+throwable.getMessage()+\"<\/li>\");\r\n\t \t out.write(\"<\/ul>\");\r\n\t }\r\n\t \r\n\t out.write(\"<br><br>\");\r\n\t out.write(\"<a href=\\\"index.html\\\">Home Page<\/a>\");\r\n\t out.write(\"<\/body><\/html>\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n\u8ba9\u6211\u4eec\u6765\u770b\u770b\u6211\u4eec\u5982\u4f55\u5728\u90e8\u7f72\u63cf\u8ff0\u7b26\u4e2d\u914d\u7f6e\u5b83\uff0c\u7136\u540e\u6211\u4eec\u5c31\u4f1a\u4e86\u89e3\u5b83\u7684\u5b9e\u65bd\u65b9\u5f0f\u548c\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<web-app xmlns:xsi=\"https:\/\/www.w3.org\/2001\/XMLSchema-instance\" xmlns=\"https:\/\/java.sun.com\/xml\/ns\/javaee\" xsi:schemaLocation=\"https:\/\/java.sun.com\/xml\/ns\/javaee https:\/\/java.sun.com\/xml\/ns\/javaee\/web-app_3_0.xsd\" version=\"3.0\">\r\n <display-name>ServletExceptionHandling<\/display-name>\r\n <welcome-file-list>\r\n <welcome-file>index.html<\/welcome-file>\r\n <\/welcome-file-list>\r\n \r\n <error-page>\r\n \t<error-code>404<\/error-code>\r\n \t<location>\/AppExceptionHandler<\/location>\r\n <\/error-page>\r\n \r\n <error-page>\r\n <exception-type>javax.servlet.ServletException<\/exception-type>\r\n <location>\/AppExceptionHandler<\/location>\r\n <\/error-page>\r\n<\/web-app>\r\n<\/code><\/pre>\n\u6b63\u5982\u60a8\u6240\u89c1\uff0c\u4f7f\u7528\u9519\u8bef\u9875\u9762\u5143\u7d20\u53ef\u4ee5\u975e\u5e38\u7b80\u5355\u5730\u4e3a\u5e94\u7528\u7a0b\u5e8f\u6307\u5b9a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8fservlet\u3002\u6bcf\u4e2a\u9519\u8bef\u9875\u9762\u5143\u7d20\u5e94\u8be5\u5177\u6709error-code\u6216exception-type\u5143\u7d20\u4e2d\u7684\u4e00\u4e2a\u3002\u6211\u4eec\u5728location\u5143\u7d20\u4e2d\u5b9a\u4e49\u5f02\u5e38\u5904\u7406\u7a0b\u5e8fservlet\u3002\u6839\u636e\u4ee5\u4e0a\u914d\u7f6e\uff0c\u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u629b\u51fa404\u9519\u8bef\u6216ServletException\uff0c\u5c06\u7531AppExceptionHandler servlet\u5904\u7406\u3002\u5f53\u51fa\u73b0\u8fd9\u6837\u7684\u5f02\u5e38\u548c\u9519\u8bef\u60c5\u51b5\u65f6\uff0cservlet\u5bb9\u5668\u5c06\u8c03\u7528\u5f02\u5e38\u5904\u7406\u7a0b\u5e8fservlet\u7684\u76f8\u5e94HTTP\u65b9\u6cd5\uff0c\u5e76\u4f20\u9012\u8bf7\u6c42\u548c\u54cd\u5e94\u5bf9\u8c61\u3002\u8bf7\u6ce8\u610f\uff0c\u6211\u63d0\u4f9b\u4e86doGet()\u548cdoPost()\u65b9\u6cd5\u7684\u5b9e\u73b0\uff0c\u4ee5\u4fbf\u5b83\u53ef\u4ee5\u5904\u7406GET\u548cPOST\u8bf7\u6c42\uff0c\u5e76\u4f7f\u7528\u4e00\u4e2a\u516c\u5171\u65b9\u6cd5\u6765\u5904\u7406\u5b83\u4eec\u3002\u5728servlet\u5bb9\u5668\u8c03\u7528servlet\u5904\u7406\u5f02\u5e38\u4e4b\u524d\uff0c\u5b83\u5728\u8bf7\u6c42\u4e2d\u8bbe\u7f6e\u4e00\u4e9b\u5c5e\u6027\uff0c\u4ee5\u83b7\u53d6\u6709\u5173\u5f02\u5e38\u7684\u6709\u7528\u4fe1\u606f\uff0c\u5176\u4e2d\u4e00\u4e9b\u5c5e\u6027\u662fjavax.servlet.error.exception\u3001javax.servlet.error.status_code\u3001javax.servlet.error.servlet_name\u548cjavax.servlet.error.request_uri\u3002\u5bf9\u4e8e\u5f02\u5e38\uff0c\u72b6\u6001\u7801\u59cb\u7ec8\u4e3a500\uff0c\u5bf9\u5e94\u4e8e\u201c\u5185\u90e8\u670d\u52a1\u5668\u9519\u8bef\u201d\uff0c\u5bf9\u4e8e\u5176\u4ed6\u7c7b\u578b\u7684\u9519\u8bef\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u4e0d\u540c\u7684\u9519\u8bef\u4ee3\u7801\uff0c\u5982404\u3001403\u7b49\u3002\u4f7f\u7528\u72b6\u6001\u7801\uff0c\u6211\u4eec\u7684\u5b9e\u73b0\u5411\u7528\u6237\u5448\u73b0\u4e0d\u540c\u7c7b\u578b\u7684HTML\u54cd\u5e94\u3002\u5b83\u8fd8\u63d0\u4f9b\u4e00\u4e2a\u6307\u5411\u5e94\u7528\u7a0b\u5e8f\u4e3b\u9875\u7684\u8d85\u94fe\u63a5\u3002\u73b0\u5728\uff0c\u5f53\u6211\u4eec\u8bbf\u95ee\u629b\u51faServletException\u7684servlet\u65f6\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u5982\u4e0b\u56fe\u50cf\u6240\u793a\u7684\u54cd\u5e94\u3002\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u65e0\u6548\u7684URL\uff0c\u5c06\u5bfc\u81f4404\u54cd\u5e94\uff0c\u6211\u4eec\u4f1a\u5f97\u5230\u5982\u4e0b\u56fe\u50cf\u6240\u793a\u7684\u54cd\u5e94\u3002\u8fd9\u770b\u8d77\u6765\u4e0d\u9519\uff0c\u5e2e\u52a9\u7528\u6237\u8f7b\u677e\u7406\u89e3\u53d1\u751f\u4e86\u4ec0\u4e48\uff0c\u5e76\u4e3a\u4ed6\u4eec\u63d0\u4f9b\u4e86\u524d\u5f80\u6b63\u786e\u4f4d\u7f6e\u7684\u9014\u5f84\u3002\u5b83\u8fd8\u907f\u514d\u5411\u7528\u6237\u53d1\u9001\u5e94\u7528\u7a0b\u5e8f\u654f\u611f\u4fe1\u606f\u3002\u6211\u4eec\u5e94\u8be5\u59cb\u7ec8\u4e3a\u6211\u4eec\u7684Web\u5e94\u7528\u7a0b\u5e8f\u8bbe\u7f6e\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u3002\u5982\u679c\u8981\u5728\u5355\u4e2a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u4e2d\u5904\u7406\u8fd0\u884c\u65f6\u5f02\u5e38\u548c\u6240\u6709\u5176\u4ed6\u5f02\u5e38\uff0c\u53ef\u4ee5\u5c06exception-type\u8bbe\u7f6e\u4e3aThrowable\u3002<\/p>\n
<error-page>\r\n <exception-type>java.lang.Throwable<\/exception-type>\r\n <location>\/AppExceptionHandler<\/location>\r\n<\/error-page>\r\n<\/code><\/pre>\n\u5982\u679c\u6709\u591a\u4e2a\u9519\u8bef\u9875\u9762\u6761\u76ee\uff0c\u5047\u8bbe\u4e00\u4e2a\u662f\u9488\u5bf9Throwable\u7684\uff0c\u4e00\u4e2a\u662f\u9488\u5bf9IOException\u7684\uff0c\u800c\u5e94\u7528\u7a0b\u5e8f\u629b\u51fa\u4e86FileNotFoundException\uff0c\u90a3\u4e48\u5b83\u5c06\u88abIOException\u7684\u9519\u8bef\u5904\u7406\u7a0b\u5e8f\u5904\u7406\u3002\u60a8\u4e5f\u53ef\u4ee5\u4f7f\u7528JSP\u9875\u9762\u4f5c\u4e3a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\uff0c\u53ea\u9700\u63d0\u4f9bjsp\u6587\u4ef6\u7684\u4f4d\u7f6e\u800c\u4e0d\u662fservlet\u6620\u5c04\u3002\u8fd9\u5c31\u662fWeb\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684Servlet\u5f02\u5e38\u5904\u7406\uff0c\u5e0c\u671b\u60a8\u559c\u6b22\u3002<\/p>\n
\u4e0b\u8f7d Servlet \u5f02\u5e38\u5904\u7406\u793a\u4f8b\u9879\u76ee<\/p>\n
\u8bf7\u67e5\u9605\u672c\u7cfb\u5217\u7684\u5176\u4ed6\u6587\u7ae0\u3002<\/p>\n
Java \u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f
\nJava Servlet \u6559\u7a0b
\nJava \u4e2d\u7684\u4f1a\u8bdd\u7ba1\u7406
\nServlet \u8fc7\u6ee4\u5668
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