additemtocartaction.java

网上购物车的JAVA代码实现版

package feng.shoppingcart.web.action;
import org.apache.struts.action.*;
import javax.servlet.*;
import javax.servlet.http.*;

import feng.shoppingcart.biz.*;
import feng.shoppingcart.entity.*;
import feng.shoppingcart.util.*;
public class AddItemToCartAction extends Action{
	@Override 
	public ActionForward execute(ActionMapping mapping,ActionForm form,
							HttpServletRequest request,HttpServletResponse response)throws Exception{
		UserBiz biz=UtilContext.getUserBiz();
		Cart cart=(Cart)request.getSession(true).getAttribute("cart");
		Integer id=Integer.valueOf(request.getParameter("id"));

		
		try{
			
			Product product=biz.queryProductById(id);
			Item item=new Item();
			item.setProduct(product);
			if(cart==null)	{
				cart=new Cart();
			}
			if(cart.getItems().get(id)!=null){
				return mapping.findForward("addItemOk");
			}
			cart.addItem(item);
			request.getSession(true).setAttribute("cart", cart);
			return mapping.findForward("addItemOk"); 
		}catch(Exception e){
			e.printStackTrace();
			return mapping.findForward("addItemError");
		}
	}
}