cartsessionlistener.java

想学习EJB的同学

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package cart.servlet;

import ejb3.day2.ShoppingCart;
import javax.ejb.EJB;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

/**
 * Web application lifecycle listener.
 * @author user
 */
@EJB(name="ejb/cart", beanInterface=ShoppingCart.class, beanName="ShoppingCartBean")
public class CartSessionListener implements HttpSessionListener {

    public void sessionCreated(HttpSessionEvent arg0) {
       try{
           Context ctx = new InitialContext();
           ShoppingCart cart = (ShoppingCart)ctx.lookup("java:comp/env/ejb/cart");
           HttpSession ses = arg0.getSession();
           ses.setAttribute("cart", cart);
       }catch(Exception e){
        throw new RuntimeException(e);
       }
        
    }

    public void sessionDestroyed(HttpSessionEvent arg0) {
        HttpSession ses = arg0.getSession();
        ses.removeAttribute("cart");
    }
}