simplefilter.java

运用过滤器对请求和响应进行替换

package org.sunxin.ch16.filter;

import java.io.*;
import javax.servlet.*;

public class SimpleFilter implements Filter
{
    public void init(FilterConfig filterConfig) throws ServletException {}
   
    public void doFilter(ServletRequest request,
                         ServletResponse response,
                         FilterChain chain)
                  throws IOException, ServletException
    {
        response.setContentType("text/html;charset=GB2312");
        PrintWriter out=response.getWriter();
        out.println("before doFilter()");
        chain.doFilter(request, response);
        out.println("after doFilter()");
        out.close();
    }
    
    public void destroy(){}
}