过滤器Filter

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;

public class GbkFilter implements Filter {

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

    }

    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        System.out.println("过滤器   doFilter()...");
        
        //放行
        chain.doFilter(req, res);
    }

    public void init(FilterConfig arg0) throws ServletException {
        System.out.println("过滤器 init...");

    }

}