HttpSessionListener实现统计在线人数

来源：互联网发布：java 所有数据类型编辑：程序博客网时间：2024/05/16 14:37

HttpSessionListener主类：

package com.httpSessionListener;import javax.servlet.http.HttpSessionEvent;import javax.servlet.http.HttpSessionListener;public class OnlineNum implements HttpSessionListener{    //静态变量累计count,这个过程中每一个用户将new一个OnlineNum实例出来private static int count;public static int getCount() {return count;}    //session创建时将创建对象并调用此方法public void sessionCreated(HttpSessionEvent arg0) {// TODO Auto-generated method stubSystem.out.println("增加了");count++;}    //浏览器关闭或手动关闭session时将调用该方法public void sessionDestroyed(HttpSessionEvent arg0) {// TODO Auto-generated method stubcount--;}}

2，创建session的类

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.getSession().setAttribute("user", "user");System.out.println(request.getSession().getAttribute("user"));request.getRequestDispatcher("index.jsp").forward(request, response);//response.sendRedirect(request.getContextPath()+"/index.jsp");}