JAVA WEB專案異常處理提示頁
阿新 • • 發佈:2019-01-09
最近一直感到困惑,為啥我的後臺報錯就赤果果的將程式中的錯誤列印在頁面,這樣在專案上線後,如果遇到500,java.lang.Exception等錯誤時,會提示很尷尬的資訊
感謝http://blog.csdn.net/zhangxin09/article/details/50644694
1.web.xml中配置
<error-page> <exception-type>java.lang.Exception</exception-type> <location>/error/error_500.jsp</location> </error-page> <error-page> <error-code>403</error-code> <location>/error/error_404.jsp</location> </error-page> <error-page> <error-code>404</error-code> <location>/error/error_404.jsp</location> </error-page> <error-page> <error-code>500</error-code> <location>/error/error_500.jsp</location> </error-page> <error-page> <error-code>503</error-code> <location>/error/error_500.jsp</location> </error-page> <error-page> <exception-type>java.lang.NullPointException</exception-type> <location>/error/error_500.jsp</location> </error-page>
2.在util頁面中COPY
http://blog.csdn.net/zhangxin09/article/details/50644694 中的寫法如下
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@page import="java.io.*"%> <%@page import="java.util.*"%> <%! class ErrorHandler { // 全部內容先寫到記憶體,然後分別從兩個輸出流再輸出到頁面和檔案 private ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); private PrintStream printStream = new PrintStream(byteArrayOutputStream); /** * 收集錯誤資訊 * @param request * @param exception * @param out */ public ErrorHandler(HttpServletRequest request, Throwable exception, JspWriter out) { setRequest(request); setException(exception); if(out != null) { try { out.print(byteArrayOutputStream); // 輸出到網頁 } catch (IOException e) { e.printStackTrace(); } } log(request); if(byteArrayOutputStream != null) try { byteArrayOutputStream.close(); } catch (IOException e) { e.printStackTrace(); } if(printStream != null) printStream.close(); } /** * * @param request */ private void setRequest(HttpServletRequest request) { HttpSession session = request.getSession(); String username=(String)session.getAttribute("edu.yale.its.tp.cas.client.filter.user"); printStream.println(); printStream.println("使用者賬號:" + username); // printStream.println("使用者賬號:" + request.getSession().getAttribute("userName")); printStream.println("訪問的路徑: " + getInfo(request, "javax.servlet.forward.request_uri", String.class)); printStream.println("出錯頁面地址: " + getInfo(request, "javax.servlet.error.request_uri", String.class)); printStream.println("錯誤程式碼: " + getInfo(request, "javax.servlet.error.status_code", int.class)); printStream.println("異常的型別: " + getInfo(request, "javax.servlet.error.exception_type", Class.class)); printStream.println("異常的資訊: " + getInfo(request, "javax.servlet.error.message", String.class)); printStream.println("異常servlet: " + getInfo(request, "javax.servlet.error.servlet_name", String.class)); printStream.println(); // 另外兩個物件 getInfo(request, "javax.servlet.jspException", Throwable.class); getInfo(request, "javax.servlet.forward.jspException", Throwable.class); Map<String, String[]> map = request.getParameterMap(); for (String key : map.keySet()) { printStream.println("請求中的 Parameter 包括:"); printStream.println(key + "=" + request.getParameter(key)); printStream.println(); } for (Cookie cookie : request.getCookies()){ // cookie.getValue() printStream.println("請求中的 Cookie 包括:"); printStream.println(cookie.getName() + "=" + cookie.getValue()); printStream.println(); } } /** * * @param exception */ private void setException(Throwable exception) { if (exception != null) { printStream.println("異常資訊"); printStream.println(exception.getClass() + " : " + exception.getMessage()); printStream.println(); printStream.println("堆疊資訊"); exception.printStackTrace(printStream); printStream.println(); } } /** * * @param request */ private void log(HttpServletRequest request) { File dir = new File(request.getSession().getServletContext().getRealPath("/errorLog")); if (!dir.exists()) { dir.mkdir(); } String timeStamp = new java.text.SimpleDateFormat("yyyyMMddhhmmssS").format(new Date()); File file = new File(dir.getAbsolutePath() + File.separatorChar + "error-" + timeStamp + ".txt"); } /** * * @param request * @param key * @param type * @return */ @SuppressWarnings("unchecked") private <T> T getInfo(HttpServletRequest request, String key, Class<T> type){ Object obj = request.getAttribute(key); return obj == null ? null : (T) obj; } } %>
3.在error_500.jsp中引入
<%@ page language="java" pageEncoding="UTF-8" isErrorPage="true"%> <%@ page import="java.io.PrintStream" %> <%@ include file="../error/util.jsp"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path; if (!path.endsWith("/")) { basePath = basePath + "/"; } %> <!doctype html> <html> <head> <meta charset="UTF-8"> <title>新版BMS支撐系統</title> <link rel="stylesheet" type="text/css" href="<%=basePath%>css/common.css"/> <link rel="stylesheet" type="text/css" href="<%=basePath%>css/main.css"/> <style> textarea { width: 100%; min-height: 300px; } </style> <script type="text/javascript" src="<%=basePath%>js/libs/modernizr.min.js"></script> </head> <body> <div class="crumb-wrap"> <div class="crumb-list"><i class="icon-font"></i><a href="#">首頁</a><span class="crumb-step">></span><span class="crumb-name">系統錯誤提示505</span></div> </div> <div class="result-wrap"> <div class="config-items"> <div class="result-content"> <table width="100%" align="center" class="insert-tab"> <tbody> <tr> <td><img src="images/icon_cry.png"/><br/> <h3>500或者503或者java.lang.NullPointException或者java.lang.Exception</h3> <span style="font-size:14px;color:red;">親愛的同事:<br/> 您好!<br/> 我們致力打造更好的運營後臺,但人算不如天算,有些錯誤發生了,希望是在控制範圍內的...<br/> 如果錯誤重複出現,請向咱們的碼農同事反饋。<br/> 錯誤資訊如下:<br/></span> </td> </tr> <tr> <td> <textarea> <% new ErrorHandler(request, exception, out); %> </textarea> </td> </tr> <tr> <td> <input type="button" value="返回" onclick="history.go(-1)" class="btn btn6"> </td> </tr> </tbody></table> </div> </div> </div> </body> </html>
到此完結,看效果
一定注意<%@ page language="java" pageEncoding="UTF-8" isErrorPage="true"%>將isErrorPage="true"設定為TRUE