处理中文的过滤器

package 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;

/**
 * 处理中文的过滤器
 * @author Administrator
 *
 */
public class GbkFilter implements Filter {
    
    private String charcode;
    
    public void init(FilterConfig config) throws ServletException {
        System.out.println("gbk init ....");
        
        charcode=config.getInitParameter("charcode");
        
        //得到容器   config.getServletContext();
        
     

    }

    public void destroy() {
        System.out.println("gbk destroy ....");

    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        System.out.println("gbk 服务 ....");     
        
        request.setCharacterEncoding(charcode);
        response.setCharacterEncoding(charcode);
        
        //放行   有两种情况     下面可能是下一个过滤器   也有可能是资源  servlet ,jsp ,html,jpg....
        chain.doFilter(request, response);  
        
        
        

    }

    

}