studentlistener.java

jsp 信息管理系统 jsp 信息管理系统 jsp 信息管理系统

package com.test.listener;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class StudentListener implements ServletContextListener,
		HttpSessionListener {

	private int count = 1;
	ServletContext application;

	public void contextInitialized(ServletContextEvent ctx) {
		application = ctx.getServletContext();
		System.out.println("init......");
	}

	public void contextDestroyed(ServletContextEvent arg0) {
		application = null;
		System.out.println("destroy......");
	}

	public void sessionCreated(HttpSessionEvent arg0) {
		count++;
		System.out.println(count);
		application.setAttribute("onlineUser", count);
		System.out.println("create.....");
	}

	public void sessionDestroyed(HttpSessionEvent arg0) {
		count--;
		application.setAttribute("onlineUser", count);
		System.out.println("session....destroy....");
	}

}