session并不是浏览器关闭时销毁的,而是在session失效的时候销毁下列代码就是监测session创建、销毁
package com.my.count;
import javax.servlet.http.*;
public class SessionCounter implements HttpSessionListener { private static int activeSessions = 0; //session创建时执行 public void sessionCreated(HttpSessionEvent se) { activeSessions++; } //session销毁时执行 public void sessionDestroyed(HttpSessionEvent se) { if (activeSessions > 0) activeSessions--; } //获取活动的session个数(在线人数) public static int getActiveSessions() { return activeSessions; } }
接下来就是配置web.xml
<listener>
<listener-class>
com.my.count.SessionCounter //这里是包名加类名 </listener-class> </listener>
接下来就可以在jsp页面中使用
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ page import="com.my.count.SessionCounter"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'ApplicationTest.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
在线人数为:<%=SessionCounter.getActiveSessions() %>
</body>
</html>
不用jsp页面 写成接口代码如下:
package com.wangyun.web.controllers;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
public class SessionCounter implements HttpSessionListener { static int activeSessions = 0; //session创建时执行 public void sessionCreated(HttpSessionEvent se) { activeSessions++; } //session销毁时执行 public void sessionDestroyed(HttpSessionEvent se) { if (activeSessions > 0) activeSessions--; } //获取活动的session个数(在线人数) public static int getActiveSessions() { return activeSessions; } }
/**
* 在线用户人数
* @throws IOException
* @throws ServletException
*/
@RequestMapping(value="user_online", method=RequestMethod.POST, produces="text/json;charset=utf-8") @ResponseBody public Object user_online() throws ServletException, IOException { JSONObject data = new JSONObject(); int number=SessionCounter.activeSessions; data.put("msg",number); return data.toString(); }