web.xml中配置error-page标签
1、WEB工程中打开 web.xml 文件
修改web.xml文件
404错误时显示/error/404error.jsp页面，500错误时显示/error/500error.jsp页面
1<?xml version="1.0" encoding="UTF-8"?>2<web-appxmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID"version="3.0">3<display-name>web01</display-name>4<welcome-file-list>5<welcome-file>index.html</welcome-file>6<welcome-file>index.htm</welcome-file>7<welcome-file>index.jsp</welcome-file>8<welcome-file>default.html</welcome-file>9<welcome-file>default.htm</welcome-file>10<welcome-file>default.jsp</welcome-file>11</welcome-file-list>1213<error-page>14<error-code>404</error-code>15<location>/error/404error.jsp</location>16</error-page>17<error-page>18<error-code>500</error-code>19<location>/error/500error.jsp</location>20</error-page>2122<servlet>23<servlet-name>empController</servlet-name>24<servlet-class>com.test.controller.EmpController</servlet-class>25</servlet>2627<servlet-mapping>28<servlet-name>empController</servlet-name>29<url-pattern>/empController</url-pattern>30</servlet-mapping>3132</web-app>
2、建立/error/404error.jsp
1<%@ page language="java"contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>2<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">3<html>4<head>5<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">6<title>404错误</title>7</head>8<body>9<h1>访问路径错误或已删除此页面</h1>10<%1112response.setStatus(HttpServletResponse.SC_OK);1314%>15</body>16</html>
3、建立/error/500error.jsp
1<%@ page language="java"contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>2<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">3<html>4<head>5<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">6<title>500错误</title>7</head>8<body>9<h1>此页面在维护中</h1>10<%1112response.setStatus(HttpServletResponse.SC_OK);1314%>15</body>16</html>
4、测试404错误，访问没有资源的路径，如：http://localhost:8081/web01/test/aa
5、测试500错误，访问代码有问题的页面，如：在jsp页面中没有导入Date对象的情况下使用了Date d = new Date();语句
1<%@ page language="java"contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>2<%@ taglib uri="http://java.sun.com/jsp/jstl/core"PRefix="c"%>3<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">4<html>5<head>6<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">7<title>web01</title>89<styletype="text/CSS">10body11{12margin-left:100px;13}14table, th, td15{16border:1px solid black;17}18</style>19<%20Dated=newDate();21%>22</head>23<body>24<formaction="/web01/empController"method="get">25员工姓名：<inputtype="text"name="searchTxt">26<inputtype="submit"value="Search">27<table>28<tr>29<th>员工号</th>30<th>员工姓名</th>31<th>职位</th>32<th>领导号</th>33<th>雇佣日期</th>34<th>工资</th>35<th>奖金</th>36<th>部门编号</th>37</tr>38<c:forEachitems="${requestScope.empBean}"var="emp">39<tr>40<td>${emp.empNo }</td>41<td>${emp.ename }</td>42<td>${emp.job }</td>43<td>${emp.mgr }</td>44<td>${emp.hiredate }</td>45<td>${emp.sal }</td>46<td>${emp.comm }</td>47<td>${emp.deptno }</td>48</tr>49</c:forEach>50</table>51</form>52</body>53</html>