cartaction.java

这是一个购物车的源码

package com.tarena.shoppingcart.action;
import org.apache.struts.actions.*;
import org.apache.struts.action.*;

import com.tarena.shoppingcart.dao.ShoppingCartHibernateImpl;
import com.tarena.shoppingcart.entity.*;
import javax.servlet.http.*;
import javax.servlet.*;
import java.util.*;

public class CartAction extends MappingDispatchAction{
	public ActionForward modifyNumber(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response)throws Exception
	{
		ActionForward forward =null;
		try{
			HttpSession session = request.getSession(false);
			Cart cart =(Cart)session.getAttribute("cart");
			String productId=request.getParameter("productId");
			String number=request.getParameter("number");
			cart.modifyNumberByProductId(Integer.valueOf(productId), Integer.parseInt(number));
			forward=mapping.findForward("cart");
		}catch(Exception e){
			e.printStackTrace();
			forward=mapping.findForward("error");
		}
		return forward;
	}
	public ActionForward deleteSelectedItem(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response) throws Exception
	{
		ActionForward forward=null;
		try{
			HttpSession session=request.getSession(false);
			Cart cart=(Cart)session.getAttribute("cart");
			String id=request.getParameter("productId");
			Integer productId=Integer.valueOf(id);
			cart.deleteItemByProductId(productId);
			if(cart.isEmpty())
				cart.setCost(0);
			forward=mapping.findForward("cart");
		}catch(Exception e){
			e.printStackTrace();
			forward=mapping.findForward("error");
		}
		return forward;
	}
	public ActionForward clearCart(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response) throws Exception
	{
		ActionForward forward =null;
		try{
			HttpSession session =request.getSession(false);
			Cart  cart=(Cart) session.getAttribute("cart");
			cart=new Cart();
			session.setAttribute("cart", cart);
			forward=mapping.findForward("cart");
		}catch(Exception e){
			e.printStackTrace();
			forward=mapping.findForward("error");
		}
		return forward;
	}
	public ActionForward submitOrder(ActionMapping mapping, ActionForm form, HttpServletRequest request,HttpServletResponse response) throws Exception
	{
		ActionForward forward = null;
		try{
			HttpSession session = request.getSession(false);
			Cart cart = (Cart)session.getAttribute("cart");
			User user=(User)session.getAttribute("user");
			if(user==null){
				forward=mapping.findForward("toLogin");
				
			}
			else if(!cart.isEmpty()){
					forward=mapping.findForward("toConfirmOrder");
			}
			else forward=mapping.findForward("cart");
		}catch(Exception e){
			e.printStackTrace();
			forward=mapping.findForward("error");
		}
		return forward;
	}
	public ActionForward generateOrder(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response) throws Exception{
		ActionForward forward=null;
		ShoppingCartHibernateImpl service=new ShoppingCartHibernateImpl();
		try{
			HttpSession session =request.getSession(false);
			User user=(User)session.getAttribute("user");
			Cart cart=(Cart)session.getAttribute("cart");
			HashSet<Item> items=cart.getValue();
			Order order=new Order();
			order.setUser(user);
			order.setItems(items);
			order.setStatus(0);
			order.setCost(cart.getCost());
			int preview =service.generateOrder(order);
			request.setAttribute("message", preview);
			session.setAttribute("cart", null);
			forward=mapping.findForward("generateOrder");
		}catch(Exception e){
			e.printStackTrace();
			forward= mapping.findForward("error");
		}
		return forward;
	}
}