03更新购物车

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/**
     * 更新购物车商品的数量
     */
    @RequestMapping("/cart/update/num/{itemId}/{num}")
    @ResponseBody
    public E3Result updateCatNum(@PathVariable Long itemId,@PathVariable Integer num,
            HttpServletRequest request,HttpServletResponse response){
        //1.取出购物车的列表
        List<TbItem> itemList = getCartListFromCookie(request);
        //2.遍历列表,找到对应的商品
        for(TbItem item :itemList){
            if(item.getId().longValue() == itemId){
                //3.更新数量
                item.setNum(num);
                break;
            }
        }
        //4.把购物车列表写回Cookie
        CookieUtils.setCookie(request, response,"cart",JsonUtils.objectToJson(itemList),COOKIE_CART_EXPIRE,true);
        //5.返回成功
        return E3Result.ok();
        
    }

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