response.setContentType("text/html;charset=UTF-8");         
         System.out.println("HTTP头信息");
         修改为:
         out.println("HTTP头信息");  
         
        while(headers.hasMoreElements()){
        String header=(String)headers.nextElement();
        System.out.println(header+"="+request.getHeader(header));
        修改为:
        out.println(header+"="+request.getHeader(header));
        }