additemtocartaction.java

这是一个网上购物店的源码

package org.digitstore.web.struts.action;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.digitstore.service.*;
import org.digitstore.domain.Cart;
import org.digitstore.domain.Item;
import org.digitstore.web.struts.form.CartActionForm;

public class AddItemToCartAction extends BaseAction {

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        CartActionForm cartForm = (CartActionForm) form;
        Cart cart = cartForm.getCart();
        String workingItemId = cartForm.getWorkingItemId();
        if (cart.containsItemId(workingItemId)) {
            cart.incrementQuantityByItemId(workingItemId);
        } else {
            // isInStock is a "real-time" property that must be updated
            // every time an item is added to the cart, even if other
            // item details are cached.
            ProductManager manager = ManagerFactory.createProductManager();
            boolean isInStock = manager.isItemInStock(workingItemId);
            Item item = manager.getItem(workingItemId);
            cartForm.getCart().addItem(item, isInStock);
        }
        return mapping.findForward("success");
    }

}