秒杀第十五节：秒杀模型管理--活动模型创建（与订单结合）

在前面的“秒杀第十三节：交易模型管理-交易模型创建”的订单创建中新增秒杀信息
在OrderService的创建订单接口createOrder中增加秒杀活动id

OrderModel createOrder(Integer userId,Integer itemId,Integer promoId,Integer amount) throws BussinessException;

在OrderServiceImpl实现createOrder中也新增promoId参数增加下单查询秒杀活动

@Override
    @Transactional
    public OrderModel createOrder(Integer userId, Integer itemId,Integer promoId, Integer amount) throws BussinessException {
        //1.校验下单状态（用户是否合法，下单商品是否存在，购买数量是否正确）
        ItemModel itemModel = itemService.getItemById(itemId);
        if(itemModel == null) {
            throw new BussinessException((EmBusinessError.PARAMETER_VALIDATION_ERROR),"商品不存在");
        }
        UserModel userModel = userService.getUserById(userId);
        if(userId == null) {
            throw new BussinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR,"用户不存在");
        }
        if(amount <= 0 || amount > 99){
            throw new BussinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR,"数量信息不正确");
        }

        // 校验活动信息
        if(promoId != null && itemModel.getPromoModel() != null) {
            // 1. 校验对应活动是否存在对应商品
            if(promoId.intValue() != itemModel.getPromoModel().getId()) {
                throw new BussinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR,"活动信息不正确");
            } else if(itemModel.getPromoModel().getStatus().intValue() != 2){
                // 2。校验活动是否在进行中
                throw new BussinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR,"活动未开始");
            }
        }

        //2.落单减库存，
        boolean result = itemService.decreaseStock(itemId,amount);
        if(!result) {
            throw new BussinessException(EmBusinessError.STOCK_NOT_ENOUGH);
        }

        //3.订单入库
        OrderModel orderModel = new OrderModel();
        orderModel.setUserId(userId);
        orderModel.setItemId(itemId);
        orderModel.setAmount(amount);
        if(promoId != null) {
            orderModel.setItemPrice(itemModel.getPromoModel().getPromoItemPrice());
        } else {
            orderModel.setItemPrice(itemModel.getPrice());
        }
        orderModel.setPromoId(promoId);
        orderModel.setOrderPrice(orderModel.getItemPrice().multiply(BigDecimal.valueOf(amount)));

        //生成交易流水号，订单号
        orderModel.setId(generatorOrderNo());
        OrderDO orderDO = convertFromOrderModel(orderModel);
        orderDOMapper.insertSelective(orderDO);
        //商品销量增加
        itemService.increaseSales(itemId,amount);
        //返回前端
        return orderModel;
    }

修改OrderController中创建订单方法

//封装下单请求
    @RequestMapping(value = "/createorder", method = {RequestMethod.POST}, consumes = {CONTENT_TYPE_FORMED})
    @ResponseBody
    public CommonReturnType createOrder(@RequestParam(name="itemId")Integer itemId,
                                        @RequestParam(name="promoId",required = false)Integer promoId,
                                        @RequestParam(name="amount")Integer amount) throws BussinessException {

        //获取登录信息（Boolean)
        Boolean isLogin = (Boolean) this.httpServletRequest.getSession().getAttribute("IS_LOGIN");

        if(isLogin == null || !isLogin.booleanValue()){
            throw new BussinessException(EmBusinessError.USER_NOT_LOGIN,"用户还未登陆，不能下单");
        }
        UserModel userModel = (UserModel) this.httpServletRequest.getSession().getAttribute("LOGIN_USER");
        OrderModel orderModel = orderService.createOrder(userModel.getId(),itemId,promoId,amount);
        return CommonReturnType.create(null);

    }

秒杀测试参数：http://localhost:8080/order/createorder?itemId=40&amount=2&promoId=2
测试结果：