jsp里面实现asp.net的Global文件内容。

Global.java文件：

 1 import javax.servlet.ServletContext;

 2 import javax.servlet.ServletContextEvent;

 3 import javax.servlet.ServletContextListener;

 4 import javax.servlet.ServletRequest;

 5 import javax.servlet.ServletRequestEvent;

 6 import javax.servlet.ServletRequestListener;

 7 import javax.servlet.http.HttpServletRequest;

 8 import javax.servlet.http.HttpSession;

 9 import javax.servlet.http.HttpSessionEvent;

10 import javax.servlet.http.HttpSessionListener;

11 

12 public class Global implements ServletContextListener, HttpSessionListener,

13         ServletRequestListener {

14 

15     @Override

16     public void contextInitialized(ServletContextEvent sce) {

17         // TODO Auto-generated method stub

18         System.out.println("网站启动");

19         ServletContext application = sce.getServletContext();

20         application.setAttribute("count", 10);

21     }

22 

23     @Override

24     public void contextDestroyed(ServletContextEvent sce) {

25         // TODO Auto-generated method stub

26         ServletContext application = sce.getServletContext();

27         application.setAttribute("count", 0);

28         System.out.println("网站停止");

29     }

30 

31     @Override

32     public void requestInitialized(ServletRequestEvent arg0) {

33         // TODO Auto-generated method stub

34         System.out.println("服务器接收一个请求");

35         ServletRequest request = arg0.getServletRequest();

36         if (request instanceof HttpServletRequest) {

37             HttpServletRequest httpRequest = (HttpServletRequest) request;

38             String url = httpRequest.getRequestURI();

39             System.out.println(url);

40         }

41     }

42 

43     @Override

44     public void requestDestroyed(ServletRequestEvent arg0) {

45         // TODO Auto-generated method stub

46         System.out.println("服务器销毁一个请求");

47     }

48 

49     @Override

50     public void sessionCreated(HttpSessionEvent arg0) {

51         // TODO Auto-generated method stub

52         System.out.println("服务器创建一个会话");

53         HttpSession session = arg0.getSession();

54         session.setAttribute("count", 10);

55 

56         ServletContext application = session.getServletContext();

57         Object obj = application.getAttribute("count");

58         if (obj instanceof Integer) {

59             Integer appCount = (Integer) obj;

60             appCount += 1;

61             application.setAttribute("count", appCount);

62         }

63     }

64 

65     @Override

66     public void sessionDestroyed(HttpSessionEvent arg0) {

67         // TODO Auto-generated method stub

68         System.out.println("服务器销毁一个会话");

69         HttpSession session = arg0.getSession();

70         ServletContext application = session.getServletContext();

71         Object obj = application.getAttribute("count");

72         if (obj instanceof Integer) {

73             Integer appCount = (Integer) obj;

74             appCount -= 1;

75             application.setAttribute("count", appCount);

76         }

77     }

78 }

Global

web.xml文件：

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>

web.xml