在web.xml配置404和500错误及异常

Web.xml：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- 配置错误处理 -->

    <error-page>

       <error-code>404</error-code>

       <location>/404.html</location>

    </error-page>

    <error-page>

       <error-code>505</error-code>                             

       <location>/505.html</location>

    </error-page>

    <!-- 配置异常处理 -->

    <error-page>

       <exception-type>javax.servle.ServletException</exception-type>

       <location>/error.html</location>

    </error-page>

    <error-page>

       <exception-type>java.lang.NullPointerException</exception-type>

       <location>/error.html</location>

    </error-page>

</web-app>

 

JSP页面的关键在于：

1、isErrorPage="true"

2、response.setStatus(HttpServletResponse.SC_OK);

<%@ page language="java" contentType="text/html; charset=GBK" isErrorPage="true" pageEncoding="GBK"%>
<%response.setStatus(HttpServletResponse.SC_OK);%>