JSP页面传值乱码过滤方法

package com.token.t1;
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 CharacterEncodingFilter implements Filter {
  public void destroy() {
  }
  public void doFilter(ServletRequest request, ServletResponse response,
      FilterChain chain) throws IOException, ServletException {
　　　　 request.setCharacterEncoding("gbk");
    chain.doFilter(request, response);
  }
  public void init(FilterConfig arg0) throws ServletException {
  }
}

?xml version="1.0" encoding="UTF-8"?>
web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
!--过滤器配置-->
　　filter>
    filter-name>CharacterEncodingFilter/filter-name>   !--此名字与filter-mapping>下filter-name>相同即可 -->
    filter-class>com.token.t1.CharacterEncodingFilter/filter-class>
  /filter>
  filter-mapping>
    filter-name>CharacterEncodingFilter/filter-name>
    url-pattern> /* /url-pattern>
  /filter-mapping>
  display-name>/display-name>
  welcome-file-list>
    welcome-file>index.jsp/welcome-file>
  /welcome-file-list>
/web-app>