jsp里面实现asp.net的Global文件内容。

 1 import javax.servlet.ServletContext;
 2 import javax.servlet.ServletContextEvent;
 3 import javax.servlet.ServletContextListener;
 4 import javax.servlet.http.HttpServlet;
 5 import javax.servlet.http.HttpSession;
 6 import javax.servlet.http.HttpSessionEvent;
 7 import javax.servlet.http.HttpSessionListener;
 8 
 9 
10 public class Global extends HttpServlet implements ServletContextListener,
11         HttpSessionListener {
12 
13     public void contextInitialized(ServletContextEvent arg0) {
14         // TODO Auto-generated method stub
15         System.out.println("网站启动");
16         ServletContext application = arg0.getServletContext();
17         application.setAttribute("count", 10);
18     }
19 
20     public void contextDestroyed(ServletContextEvent arg0) {
21         // TODO Auto-generated method stub
22         System.out.println("网站停止");
23         ServletContext application = arg0.getServletContext();
24         application.setAttribute("count", 0);
25     }
26 
27     public void sessionCreated(HttpSessionEvent arg0) {
28         // TODO Auto-generated method stub
29         System.out.println("创建一个session");
30         HttpSession session = arg0.getSession();
31         session.setAttribute("count", 10);
32         
33         ServletContext application = session.getServletContext();
34         Object obj = application.getAttribute("count");
35         if(obj instanceof Integer){
36             Integer appCount = (Integer)obj;
37             application.setAttribute("count", appCount);
38         }
39     }
40 
41     public void sessionDestroyed(HttpSessionEvent arg0) {
42         // TODO Auto-generated method stub
43         System.out.println("销毁一个session");
44     }
45 
46 }

1 <?xml version="1.0" encoding="UTF-8"?>
2 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
3  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">
4  <listener>
5   <listener-class>Global</listener-class>
6  </listener>
7 </web-app>