java中的乱码处理

1. 编写filter
package com.chinasofti.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;

public class CharacterEncodingFilter implements Filter {

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

 }

 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  
  request.setCharacterEncoding("UTF-8");
  response.setContentType("text/html; charset=UTF-8");
  response.setCharacterEncoding("UTF-8");
  
  chain.doFilter(request, response);
 }

 public void init(FilterConfig arg0) throws ServletException {

 }

}

2. 配置filter 在web.xml中添加
  <filter>
     <filter-name>cf</filter-name>
     <filter-class>com.chinasofti.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
     <filter-name>cf</filter-name>
     <url-pattern>/*</url-pattern>
    </filter-mapping>