jsp里面实现asp.net的Global文件内容。

Global.java文件：

 import javax.servlet.ServletContext;
 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletRequestEvent;
 import javax.servlet.ServletRequestListener;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
 import javax.servlet.http.HttpSessionEvent;
 import javax.servlet.http.HttpSessionListener;

 public class Global implements ServletContextListener, HttpSessionListener,
         ServletRequestListener {

     @Override
     public void contextInitialized(ServletContextEvent sce) {
         // TODO Auto-generated method stub
         System.out.println("网站启动");
         ServletContext application = sce.getServletContext();
         application.setAttribute("count", 10);
     }

     @Override
     public void contextDestroyed(ServletContextEvent sce) {
         // TODO Auto-generated method stub
         ServletContext application = sce.getServletContext();
         application.setAttribute("count", 0);
         System.out.println("网站停止");
     }

     @Override
     public void requestInitialized(ServletRequestEvent arg0) {
         // TODO Auto-generated method stub
         System.out.println("服务器接收一个请求");
         ServletRequest request = arg0.getServletRequest();
         if (request instanceof HttpServletRequest) {
             HttpServletRequest httpRequest = (HttpServletRequest) request;
             String url = httpRequest.getRequestURI();
             System.out.println(url);
         }
     }

     @Override
     public void requestDestroyed(ServletRequestEvent arg0) {
         // TODO Auto-generated method stub
         System.out.println("服务器销毁一个请求");
     }

     @Override
     public void sessionCreated(HttpSessionEvent arg0) {
         // TODO Auto-generated method stub
         System.out.println("服务器创建一个会话");
         HttpSession session = arg0.getSession();
         session.setAttribute("count", 10);

         ServletContext application = session.getServletContext();
         Object obj = application.getAttribute("count");
         if (obj instanceof Integer) {
             Integer appCount = (Integer) obj;
             appCount += 1;
             application.setAttribute("count", appCount);
         }
     }

     @Override
     public void sessionDestroyed(HttpSessionEvent arg0) {
         // TODO Auto-generated method stub
         System.out.println("服务器销毁一个会话");
         HttpSession session = arg0.getSession();
         ServletContext application = session.getServletContext();
         Object obj = application.getAttribute("count");
         if (obj instanceof Integer) {
             Integer appCount = (Integer) obj;
             appCount -= 1;
             application.setAttribute("count", appCount);
         }
     }
 }

Global

web.xml文件：

 <?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">
  <listener>
   <listener-class>Global</listener-class>
  </listener>
 </web-app>

web.xml