struts actionform乱码过滤器

package com.gprs.enfant.struts.filters;

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);  
   chain.doFilter(request,response);  
}  
 
public void destroy() {  
   // TODO Auto-generated method stub  
 encoding=null;
}  
 
} 

========web xml file config============

<!-- ActionForm Filter -->
   <filter>  
    <filter-name>SetCharacterEncodingFilter</filter-name>  
    <filter-class>com.gprs.enfant.struts.filters.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>

 

值得注意的是提交到Action的页面表单默认method=get 这个时候也有可能造成乱码。