sessionlistener.java

一个J2EE 做的 网上图书销售管理系统

package com.briup.web.listener;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import com.briup.bean.Orderline;
import com.briup.bean.ShoppingCart;

public class SessionListener implements HttpSessionListener {

	public void sessionCreated(HttpSessionEvent arg0) {
		// TODO Auto-generated method stub
		
		HttpSession session = arg0.getSession();
		ShoppingCart cart = new ShoppingCart();
		session.setAttribute("cart", cart);
		
		List list=new ArrayList();
		session.setAttribute("list", list);
//		要求开启页面以后只能注册一次,防止网速慢或其它原因引起恶意注册
		//判断当前session中的令牌值和请求参数中的
		//令牌值是否匹配RegisterAction类中
		session.setAttribute("reg","1");
		
	}

	public void sessionDestroyed(HttpSessionEvent arg0) {
		// TODO Auto-generated method stub
		HttpSession session = arg0.getSession();
		session.removeAttribute("cart");
		session.removeAttribute("list");
		session.removeAttribute("reg");
	}

}