zoukankan html css js c++ java

监听器的使用

1.首页面

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <script type="text/javascript" src="../js/jquery-1.7.2.js"></script>
10 <body>
11 <form action="../SessionServlet">
12 用户：<input type="text" name="userName"/><br/>
13   <button type="submit">提交</button>
14   <button type="button">退出</button>
15 </form>
16 </body>
17 <script type="text/javascript">
18  $(":button").click(function(){
19     
20     location.href="../DestroySession";
21 }) 
22 
23 
24 </script>
25 </html>

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2.监听器（HttpServletListener）

 1 package com.zdsofe.work;
 2 
 3 import java.io.FileNotFoundException;
 4 import java.io.FileOutputStream;
 5 import java.io.PrintWriter;
 6 import java.text.SimpleDateFormat;
 7 import java.util.Date;
 8 
 9 import javax.servlet.http.HttpSessionEvent;
10 import javax.servlet.http.HttpSessionListener;
11 
12 public class Listener1 implements HttpSessionListener {
13 
14     @Override
15     public void sessionCreated(HttpSessionEvent arg0) {
16         
17      String mess="创建成功";
18      writeLog(mess);
19     }
20 
21     @Override
22     public void sessionDestroyed(HttpSessionEvent arg0) {
23         
24     String mess="销毁OK";
25      writeLog(mess);
26     }
27     
28     
29     public void writeLog(String message)
30     {
31         PrintWriter out=null;
32         try {
33              out=new PrintWriter(new FileOutputStream("D://log.txt", true));
34              try {
35                 out.print(new SimpleDateFormat("yyyy-MM-dd").format(Date.class.newInstance()));
36                 out.println(message);
37             } catch (InstantiationException e) {
38                 // TODO Auto-generated catch block
39                 e.printStackTrace();
40             } catch (IllegalAccessException e) {
41                 // TODO Auto-generated catch block
42                 e.printStackTrace();
43             }
44         } catch (FileNotFoundException e) {
45             // TODO Auto-generated catch block
46             e.printStackTrace();
47         }
48         out.flush();
49         out.close();
50     }
51 }

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3.创建session的servlet

 1 package com.zdsofe.work;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.annotation.WebServlet;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 import javax.servlet.http.HttpSession;
11 
12 /**
13  * Servlet implementation class SessionServlet
14  */
15 @WebServlet("/SessionServlet")
16 public class SessionServlet extends HttpServlet {
17     private static final long serialVersionUID = 1L;
18        
19     /**
20      * @see HttpServlet#HttpServlet()
21      */
22     public SessionServlet() {
23         super();
24         // TODO Auto-generated constructor stub
25     }
26 
27     /**
28      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
29      */
30     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
31          HttpSession session= request.getSession();
32          session.setAttribute("name", request.getParameter("userName"));
33          
34          
35     }
36 
37     /**
38      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
39      */
40     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
41         // TODO Auto-generated method stub
42     }
43 
44 }

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4.销毁session的servlet

 1 package com.zdsofe.work;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.ServletException;
 5 import javax.servlet.annotation.WebServlet;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 /**
11  * Servlet implementation class DestroySession
12  */
13 @WebServlet("/DestroySession")
14 public class DestroySession extends HttpServlet {
15     private static final long serialVersionUID = 1L;
16        
17     /**
18      * @see HttpServlet#HttpServlet()
19      */
20     public DestroySession() {
21         super();
22         // TODO Auto-generated constructor stub
23     }
24 
25     /**
26      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
27      */
28     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
29         request.getSession().invalidate();
30     }
31 
32     /**
33      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
34      */
35     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
36         
37     }
38 
39 }

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5.在web.xml中配置监听器

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 3   <display-name>webProject5</display-name>
 4   <listener>
 5     <listener-class>com.zdsofe.work.Listener1</listener-class>
 6   </listener>
 7   <welcome-file-list>
 8     <welcome-file>index.html</welcome-file>
 9     <welcome-file>index.htm</welcome-file>
10     <welcome-file>index.jsp</welcome-file>
11     <welcome-file>default.html</welcome-file>
12     <welcome-file>default.htm</welcome-file>
13     <welcome-file>default.jsp</welcome-file>
14   </welcome-file-list>
15 </web-app>

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6.监听器（ServletContextListener）

 1 package com.zdsofe.work;
 2 
 3 import javax.servlet.ServletContext;
 4 import javax.servlet.ServletContextEvent;
 5 import javax.servlet.ServletContextListener;
 6 
 7 public class Listener2 implements ServletContextListener {
 8 
 9     @Override
10     public void contextDestroyed(ServletContextEvent event) {
11         System.out.println("杀驴逼");
12     
13     }
14    
15     
16     @Override
17     public void contextInitialized(ServletContextEvent event) {
18         
19      //加载监听的时候获得项目名称
20      ServletContext context= event.getServletContext();
21      String name= context.getServletContextName();
22      context.setAttribute("name", name);
23      //获取初始化参数
24      String s=  context.getInitParameter("lister");
25      System.out.println(s);
26      
27     }
28 
29 }

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7.web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 3   <display-name>webProject5</display-name>
 4   <listener>
 5     <listener-class>com.zdsofe.work.Listener2</listener-class>
 6   </listener>
 7   <context-param>
 8   <param-name>lister</param-name>
 9   <param-value>utf-8</param-value>
10   </context-param>
11   <welcome-file-list>
12     <welcome-file>index.html</welcome-file>
13     <welcome-file>index.htm</welcome-file>
14     <welcome-file>index.jsp</welcome-file>
15     <welcome-file>default.html</welcome-file>
16     <welcome-file>default.htm</welcome-file>
17     <welcome-file>default.jsp</welcome-file>
18   </welcome-file-list>
19 </web-app>

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原文地址：https://www.cnblogs.com/zclqian/p/7267839.html