/** 查看购物车 */
 public String myShoppingCart() {
   HttpServletRequest request = ServletActionContext.getRequest();
   // 获取用户ID
   Users user = (Users) request.getSession().getAttribute("users");
   String userId = user.getId();
   // 购物车商品列表map
   Map<Commodity, Integer> cartmap =
       (Map<Commodity, Integer>) request.getSession().getAttribute("cartmap");
   // 根据userid查询购物车表的commodity
   String hql = "from ShoppingCart s where s.usersId = ? ";
   List<ShoppingCart> list = commonService.findListByHQL(hql, userId);
   // 购物车中的商品数量
   int count = 0;
   // 购物车商品总价
   float money = 0;
   if (list.size() > 0) {
     for (int i = 0; i < list.size(); i++) {
       ShoppingCart shoppingCart = list.get(i);
       commodity = commonService.findById(shoppingCart.getCommodityId(), new Commodity());
       FileSource fileSource = commonService.findById(commodity.getPicId(), new FileSource());
       commodity.setFileSource(fileSource);
       cartmap.put(commodity, shoppingCart.getCount());
       money += commodity.getPrice() * shoppingCart.getCount();
       count += shoppingCart.getCount();
     }
   }
   request.setAttribute("count", count);
   request.setAttribute("money", money);
   request.setAttribute("cartmap", cartmap);
   return "myShoppingCart";
 }
  /** 加入购物车 */
  public String addToShoppingCart() {
    HttpServletRequest request = ServletActionContext.getRequest();
    Timestamp creTime = Utils.date2Stamp(new Date());
    // 获取用户ID
    Users user = (Users) request.getSession().getAttribute("users");
    String userId = user.getId();

    // 获取页面传的商品ID
    String id = request.getParameter("commodity.id");
    System.out.println(id);

    Map<Commodity, Integer> cartmap =
        (Map<Commodity, Integer>) request.getSession().getAttribute("cartmap");
    // 根据userid查询购物车表有无该用户对应的commodityID
    String hql = "from ShoppingCart s where s.usersId = ? ";
    List<ShoppingCart> list = commonService.findListByHQL(hql, userId);
    // 购物车商品总价
    int money = 0;
    // 购物车商品总数
    int count = 0;
    boolean flag = false; // 记录查询时是否有对应的commodityId对应上

    for (int i = 0; i < list.size(); i++) {
      ShoppingCart shoppingCart = list.get(i);
      if (id.equals(shoppingCart.getCommodityId().toString())) {
        // 更新shoppingcart表的count值
        shoppingCart.setCount(shoppingCart.getCount() + 1);
        commonService.saveOrUpdate(shoppingCart);
        flag = true;
      }
      commodity = commonService.findById(shoppingCart.getCommodityId(), new Commodity());
      FileSource fileSource = commonService.findById(commodity.getPicId(), new FileSource());
      commodity.setFileSource(fileSource);
      cartmap.put(commodity, shoppingCart.getCount());
      // 更新购物车商品总数
      count = count + shoppingCart.getCount();
      // 更新购物车商品总价
      money = (int) (money + shoppingCart.getCount() * commodity.getPrice());
    }
    // 设置属性并保存新的shoppingcart实体
    if (flag == false) {
      shoppingCart.setCommodityId(id);
      shoppingCart.setCreateTime(creTime);
      shoppingCart.setUpdateTime(creTime);
      shoppingCart.setId(Utils.getUUID());
      shoppingCart.setUsersId(userId);
      shoppingCart.setCount(1);
      commonService.save(shoppingCart);
      // 取得新增的商品信息并放入cartmap
      commodity = commonService.findById(shoppingCart.getCommodityId(), new Commodity());
      FileSource fileSource = commonService.findById(commodity.getPicId(), new FileSource());
      commodity.setFileSource(fileSource);
      cartmap.put(commodity, shoppingCart.getCount());
      // 更新购物车商品总数
      count = count + shoppingCart.getCount();
      // 更新购物车商品总价
      money = (int) (money + shoppingCart.getCount() * commodity.getPrice());
    }

    request.setAttribute("cartmap", cartmap);
    request.setAttribute("money", money);
    request.setAttribute("count", count);

    return "addToShoppingCart";
  }