方法：
1.web.xml中添加 如下代码
<!-- 400错误 请求无效 -->
<error-page>
<error-code>400</error-code>
<location>/error.jsp</location>
</error-page>
<!-- 404 页面不存在错误 -->
<error-page>
<error-code>404</error-code>
<location>/error.jsp</location>
</error-page>
<!-- 500 服务器内部错误 -->
<error-page>
<error-code>500</error-code>
<location>/error.jsp</location>
</error-page>
<!-- java.lang.Exception异常错误,依据这个标记可定义多个类似错误提示 -->
<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>/error.jsp</location>
</error-page>
<!-- java.lang.NullPointerException异常错误,依据这个标记可定义多个类似错误提示 -->
<error-page>
<exception-type>java.lang.NullPointerException</exception-type>
<location>/error.jsp</location>
</error-page>
<error-page>
<exception-type>javax.servlet.ServletException</exception-type>
<location>/error.jsp</location>
</error-page>
2.error.jsp代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>JSP Page</title>
</head>
<body>
页面异常<br>
请联系管理员
</body>
</html>
3.测试页面 errorPageTest.jsp
这里故意设置 1/0 为了测试
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>testErrorPage</title>
</head>
<body>
<%
int i=1/0;
%>
</body>
</html>
4.测试
1).访问测试页面 转到error.jsp 则证明成功
2).浏览器地址栏中输入项目中一个不存在的页面 转到error.jsp 则证明成功
5.其它
若不在web.xml配置错误页面，
则需要在error.jsp中指定
<%@page isErrorPage="true"%>
且需要有可能出错的页面 设置
<%@page errorPage="error.jsp" %>
6.注意：
有时候error.jsp页面无效 可能是浏览器设置造成的
解决方案：
1).在IE【工具】->【Internet选项】->【高级】中勾掉【显示友好http错误提示】；
2).确保error.jsp的大小>1024字节。
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