shoppingcartsessionlistener.java

使用servlet写的简单网上书店

package listener;

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

import entity.ShoppingCart;

public class ShoppingCartSessionListener implements HttpSessionListener{
	private ShoppingCart cart;
	public void sessionCreated(HttpSessionEvent event) {
		cart=new ShoppingCart();
		event.getSession().setAttribute("cart", cart);
		System.out.println("session is created");
	}

	public void sessionDestroyed(HttpSessionEvent event) {
		event.getSession().getAttribute("cart");
		cart=null;
		System.out.println("session is destroyed");
	}

}