<filter>
       <filter-name>encodeFilter</filter-name>
       <filter-class>com.pkpm.houseManager.filter.CharacterEncodingFilter</filter-class>
       <init-param>
          <param-name>encoding</param-name>
          <param-value>gb2312</param-value>
       </init-param>
       <init-param>
          <param-name>ignore</param-name>
          <param-value>true</param-value>
       </init-param>
       
    </filter>
    
    <filter-mapping> 
       <filter-name>encodeFilter</filter-name> 
       <url-pattern>/company/*</url-pattern> 
    </filter-mapping>
    <filter-mapping>
        <filter-name>encodeFilter</filter-name>
        <url-pattern>/*.jsp</url-pattern>
    </filter-mapping>
    <filter-mapping> 
       <filter-name>encodeFilter</filter-name> 
       <url-pattern>/servlet/*</url-pattern> 
    </filter-mapping>

package com.pkpm.houseManager.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 {

     protected String encoding = null;  

     protected FilterConfig filterConfig = null;  

     protected boolean ignore = true;  

     public void destroy() {  
         this.encoding = null;  
         this.filterConfig = null;  
     }  

     public void doFilter(ServletRequest request, ServletResponse response,  FilterChain chain) throws IOException, ServletException {  
         // Conditionally select and set the character encoding to be used  
         if (ignore || (request.getCharacterEncoding() == null)) {  
             String encoding = selectEncoding(request);  
             if (encoding == null) { 
                 request.setCharacterEncoding(encoding);  
             }
         }  
        chain.doFilter(request, response);  
     }  

    public void init(FilterConfig filterConfig) throws ServletException {  
         
         this.filterConfig = filterConfig;  
         this.encoding = filterConfig.getInitParameter("encoding");  
         String value = filterConfig.getInitParameter("ignore");  
         if (value == null) {
             this.ignore = true;  
         } else if (value.equalsIgnoreCase("true")) {
             this.ignore = true;  
         } else if (value.equalsIgnoreCase("yes")) {
             this.ignore = true;  
         } else {
             this.ignore = false;  
         }
     }  

     protected String selectEncoding(ServletRequest request) {  
         return (this.encoding);  
     }  

}