?? listproductaction.java
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package com.tarena.shoppingcart.action;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.util.*;import com.tarena.shoppingcart.entity.*;import com.tarena.shoppingcart.dao.ShoppingCartHibernateImpl;import org.apache.struts.action.*;public class ListProductAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { ActionForward forward=null; ShoppingCartHibernateImpl service=new ShoppingCartHibernateImpl(); try{ List list=(List)service.listProducts(); Cart cart=new Cart(); if(list!=null){ //疑問:根本就沒有分配Session,哪來的? HttpSession session=request.getSession(false); if(session.getAttribute("cart")==null){ session.setAttribute("cart",cart); } session.setAttribute("products",list); forward=mapping.findForward("list"); } }catch(Exception e){ e.printStackTrace(); forward=mapping.findForward("error"); } return forward; }}
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