用过滤器解决jsp中文乱码

1jsp页头设置为UTF-8   如下：
Java代码
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


2
过滤器，，也就一个java类而已：代码如下：
Java代码
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 SetCharacterEncodingFilter implements Filter {  
     private String encoding;  
     public void init(FilterConfig filterConfig) throws ServletException {  
      // TODO Auto-generated method stub  
      this.encoding=filterConfig.getInitParameter("encoding");  
     }  
 
     public void doFilter(ServletRequest request, ServletResponse response,  
       FilterChain chain) throws IOException, ServletException {  
      // TODO Auto-generated method stub  
      request.setCharacterEncoding(this.encoding);  
      response.setCharacterEncoding(this.encoding);  
      chain.doFilter(request,response);  
     }  
 
     public void destroy() {  
      // TODO Auto-generated method stub  
 
     }  
 
    } 

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 SetCharacterEncodingFilter implements Filter {
     private String encoding;
     public void init(FilterConfig filterConfig) throws ServletException {
      // TODO Auto-generated method stub
      this.encoding=filterConfig.getInitParameter("encoding");
     }

     public void doFilter(ServletRequest request, ServletResponse response,
       FilterChain chain) throws IOException, ServletException {
      // TODO Auto-generated method stub
      request.setCharacterEncoding(this.encoding);
      response.setCharacterEncoding(this.encoding);
      chain.doFilter(request,response);
     }

     public void destroy() {
      // TODO Auto-generated method stub

     }

    }

3web.xml中添加过滤器的配置：
Java代码
<filter>  
<filter-name>SetCharacterEncodingFilter</filter-name>  
<filter-class>SetCharacterEncodingFilter</filter-class>  
<init-param>  
  <param-name>encoding</param-name>  
  <param-value>utf-8</param-value>  
</init-param>  
</filter>  
<filter-mapping>  
<filter-name>SetCharacterEncodingFilter</filter-name>  
<url-pattern>/*</url-pattern>  
</filter-mapping>