使用Filter解决中文乱码问题

来源：互联网发布：笑之大学知乎编辑：程序博客网时间：2024/06/04 19:39

在使用jsp的时候，总会遇到中文乱码问题，几天不会的Filter 解决中文乱码的问题，今天解决了。。。也不知到什么原因，以前的400,错误消失啦，赶紧记录下。。。

1.index.jsp

<!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><body><h1>用Filter解决中文乱码问题</h1><hr/><form action="display" method="post">姓名:<input type="text" name="name"/><input type="submit" value="Submit"/></form></body></html>

2.接下来则是，对于提交的到display的表单，添加servlet，新建cn.edu.hpu.servlet包，在包下创建DispalyServlet的Servlet

DispalyServlet.java

package cn.edu.hpu.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class DispalyServlet */@WebServlet("/display")<span style="background-color: rgb(204, 0, 0);">//注意这里的url</span>public class DispalyServlet extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public DispalyServlet() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubSystem.out.println("Message from display servlet.");response.setCharacterEncoding("utf8");request.getRequestDispatcher("/display.jsp").forward(request, response);}}

3.接收页面 display.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><body>您输入的姓名是:<%=request.getParameter("name") %></body></html>

4.这里是最重要的，添加过滤Filter

package cn.hpu.edu.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;import javax.servlet.annotation.WebFilter;/** * Servlet Filter implementation class FilterServlet */@WebFilter("/*")public class FilterServlet implements Filter {private FilterConfig config = null;    /**     * Default constructor.      */    public FilterServlet() {        // TODO Auto-generated constructor stub    }/** * @see Filter#destroy() */public void destroy() {// TODO Auto-generated method stub}/** * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain) */public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {// TODO Auto-generated method stub// place your code here// pass the request along the filter chain<span style="background-color: rgb(255, 153, 102);">System.out.println("Message from before encoding filter.");String encoding = config.getInitParameter("encoding");request.setCharacterEncoding(encoding);response.setCharacterEncoding(encoding);chain.doFilter(request, response);System.out.println("Message after before encoding filter.");</span>}/** * @see Filter#init(FilterConfig) */public void init(FilterConfig config) throws ServletException {// TODO Auto-generated method stubthis.config = config;}}

同时要在web.xml中配置Filter的初始化内容

 <filter>    <filter-name>endodingFilter</filter-name>    <filter-class>cn.hpu.edu.filter.FilterServlet</filter-class>    <init-param>    <param-name>encoding</param-name>    <param-value>UTF-8</param-value>    </init-param>  </filter>  <filter-mapping>    <filter-name>endodingFilter</filter-name>    <url-pattern>/*</url-pattern>   <!-- 我们要过滤所有的文件，解决所有的中文呢乱码问题，所以url设置为/* -->  </filter-mapping>

到这里，我们就实现了用Filter解决中文乱码问题

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