package com.rmeng.shoppingCart.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;import com.rmeng.shoppingCart.biz.SystemBiz;import com.rmeng.shoppingCart.javabean.entity.Cart;import com.rmeng.shoppingCart.javabean.entity.Item;import com.rmeng.shoppingCart.javabean.entity.Product;public class AddItemToCartAction extends Action					{	public ActionForward execute(ActionMapping mapping, ActionForm form, 			HttpServletRequest request, HttpServletResponse response)throws Exception					{					SystemBiz systemBiz=new SystemBiz();										String[] s=request.getParameterValues("item");										HttpSession session=request.getSession();										Cart cart=(Cart) session.getAttribute("cart");										double cost = 0;										for(int i=0;i<s.length;i++){										int pid=Integer.parseInt(s[i]);																		if(cart.getItems().get(pid)!=null)					{						session.setAttribute("cart",cart);									}else					{						Product product=systemBiz.findProductById(pid);															cart.addItem(new Item(product,1,product.getPrice()));												cost+=product.getPrice();												cart.setCost(cost);												session.setAttribute("cart",cart);					}																	}					return mapping.findForward("success");				}			}