Filter 解决全站中文乱码问题

来源：互联网发布：linux stat文件编辑：程序博客网时间：2024/05/16 05:44

/*----------------------Demo1.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><title>Insert title here</title></head><body>能别报错嘛!!?<form action="${pageContext.request.contextPath }/servlet/ServletDemo1" method="post"><input type="text" name="username"><input type="submit" value="提交"></form></body></html>

/*----------------------------------servlet----------------------------------------------------------------------------------------*/

import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ServletDemo1 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println(request.getParameter("username"));}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

/*---------------------------------过滤器----------------------------------------------------------------------------------------*/

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.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;//解决全站编码统一问题//请求编码，响应编码public class CharacterEncodingFilter implements Filter {private FilterConfig filterConfig;private String defaultEncoding = "utf-8";public void destroy() {}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {//用户请求至浏览器，请求是带HTTP协议，需要强转HttpServletRequest req = (HttpServletRequest) request;HttpServletResponse res =  (HttpServletResponse) response;//获取XML里的配置信息编码String encode = filterConfig.getInitParameter("encodeing");//判断配置文件里是否有配置,没有的话就把默认定义的编码指定给encodeif(encode==null)encode = defaultEncoding;//设置request.setCharacterEncoding(encode); response.setContentType("text/html;charset="+encode);//把增强的request传给servlet层MyRequest myreq = new MyRequest(req);chain.doFilter(myreq, response);//chain.doFilter(new MyRequest(req), res);//简写}public void init(FilterConfig filterConfig) throws ServletException {this.filterConfig = filterConfig;}}

/*---------------------------------增强request----------------------------------------------------------------------------------------*/

import java.io.UnsupportedEncodingException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;public class MyRequest extends HttpServletRequestWrapper {private HttpServletRequest request;public MyRequest(HttpServletRequest request) {super(request);this.request = request;}public String getParameter(String name){//获取用户提交的数据String value = request.getParameter(name);//判断是否为空if( value==null )return value;try {//判断是否为GET提交方式if(request.getMethod().equalsIgnoreCase("get")){value = new String(value.getBytes("ISO-8859-1"),request.getCharacterEncoding());}return value;} catch (UnsupportedEncodingException e) {throw new RuntimeException();}}}