问答详情
源自:5-2 [Java Web] 过滤器的分类2

用eclipse配置ErrorFilter看过来

//创建ErrorFilter
package com.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class ErrorFilter implements Filter {

	@Override
	public void destroy() {

	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
			throws IOException, ServletException {
		arg2.doFilter(arg0, arg1);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {

	}
}

//页面index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<h1>这是一个JSP</h1>
</body>
</html>

//页面error.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
	<%
		response.setStatus(200);//想在eclipse自带的浏览器看到错误就加上这句
	%>
<body>
	<h1>抱歉,您输入的路径有误!</h1>
</body>
</html>

//写web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns: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">
  <display-name>JavaWeb_001_fistFilter</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list> 
  
  <filter>
  	<filter-name>ErrorFilter</filter-name>
  	<filter-class>com.filter.ErrorFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>ErrorFilter</filter-name>
  	<url-pattern>/index.jsp</url-pattern>
  	<dispatcher>ERROR</dispatcher>    //记得加上这个,不然是默认的
  </filter-mapping>
  <error-page>        
  	<error-code>404</error-code>
  	<location>/error.jsp</location>
  </error-page>
  
</web-app>


提问者:往惜如梦 2018-03-08 15:44

个回答

  • qq_努力看书中_03720576
    2019-02-14 17:52:37

    <url-pattern>/index.jsp</url-pattern>

    这个写错了你这个变成了当请求index.jsp的时候才会调用errorfilter

    应该是

    <url-pattern>/error.jsp</url-pattern>


  • 往惜如梦
    2018-03-08 15:44:41

    这样就是正确的了