addcartmoreaction.java

一个很适合初学者的网上书店系统

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.ascent.struts.action;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.ascent.bean.Book;
import com.ascent.util.ShoppingCart;
import com.ascent.util.ShoppingCartItem;

/**
 * MyEclipse Struts Creation date: 07-31-2006
 * 
 * XDoclet definition:
 * 
 * @struts.action input="/morebookin.jsp" validate="true"
 */
public class AddCartMoreAction extends BaseAction {
	/*
	 * Generated Methods
	 */

	/**
	 * Method execute
	 * 
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		int bookId = Integer.parseInt(request.getParameter("bookId"));
		ShoppingCart cart = null;
		ShoppingCartItem cartItem = null;
		/**
		 * 当用户在更多书籍浏览时购书，把书籍加到购物车中
		 */
		HttpSession session = request.getSession();
		List l = this.getBookService().findBookById(bookId);// 根据id获得要购买的图书信息
		Book book = (Book) l.iterator().next();
		cartItem = new ShoppingCartItem();
		cartItem.setBook(book);
		if (session.getAttribute("items") == null) {
			cart = new ShoppingCart();
		} else {
			cart = (ShoppingCart) session.getAttribute("cart");
		}
		cart.addItem(cartItem);
		List items = cart.getItems();
		session.setAttribute("items", items);
		session.setAttribute("cart", cart);
		return mapping.findForward("viewcart");

	}
}