import java.io.IOException;

import java.io.PrintWriter;

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.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.util.*;

public class EncodingFilter extends HttpServlet implements Filter {

private FilterConfig filterConfig;

private String trargetEncoding=null;

public void init(FilterConfig filterConfig)throws ServletException{

   this.filterConfig=filterConfig;

   this.trargetEncoding=this.filterConfig.getInitParameter("encoding");

}

public void doFilter(ServletRequest request, ServletResponse response,

    FilterChain filterChain) {

   // TODO Auto-generated method stub

   try{

    //在控制台输出目标编码

    System.out.println("trargetEncoding:"+trargetEncoding+"\\n");

    //执行编码，实际的处理内容

    request.setCharacterEncoding(trargetEncoding);

    filterChain.doFilter(request,response);

   }

   catch (ServletException sx)

   {

    filterConfig.getServletContext().log(sx.getMessage());

   }

   catch (IOException iox){

    filterConfig.getServletContext().log(iox.getMessage());

   }

} 

public void destroy() {

   //清空资源

   this.filterConfig=null;

   this.trargetEncoding=null;

}

}

2.在web.xml中把下面的代码插到与中间，

encodingfilter

xiaogu.EncodingFilter//xiaogu为你的Java程序的包名，EncodingFilter是你的java的类名。

encode to UTF-8//UTF-8表示中文编码

encoding

UTF-8

encodingfilter

/*

ok中文乱码问题全部解决。整了一下，分享给大家。下载本文