新手问个servlet小问题 求高手指教

代码 ：
package com.login.servlet;
import javax.servlet.http.*;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import java.io.*;
public class HelloServlet extends HttpServlet {
   public void init ( ServletConfig config ) throws ServletException{
   super.init(config);
   }
   public void doGet(HttpServletRequest req, 
           HttpServletResponse resp)
   throws ServletException, IOException {
   resp.setContentType("text/html;charset=GB2312");
      System.out.println("<html>");
      System.out.println("<head><title>CN2=HelloServlet</title><head>");
      System.out.println("<body>");
      System.out.println("hello XXXXX <br>");
      System.out.println("大家好");
      System.out.println("</body>");
      System.out.println("</html>");
      System.out.close();
   }
   public String getServletInfo(){
   return "com.login.servlet Information";
   }
   public void destory(){}
}
web.xml<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
   <servlet>
  <servlet-name>HelloServlet</servlet-name>
   <servlet-class>com.login.servlet.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>HelloServlet</servlet-name>
  <url-pattern>/HelloServlet</url-pattern>
  </servlet-mapping>
</web-app>
浏览器打开窗口:http://localhost:8080\Hello_Web\HelloServlet页面为什么是空白的。但Console下输出这个：
<html>
<head><title>CN2=HelloServlet</title><head>
<body>
hello XXXXX <br>
大家好
</body>
</html>