黑马瑞吉用户下单代码实现

今天依旧学习了黑马的瑞吉外卖，以下是我跟着视频学习写的代码，关于用户下单：

@Override
@Transactional
public void submit(Orders orders) {
    //获得当前用户id
    Long currentId = BaseContext.getCurrentId();

    //查询当前用户的购物车数据
    LambdaQueryWrapper<ShoppingCart> lqw = new LambdaQueryWrapper<>();
    lqw.eq(ShoppingCart::getUserId,currentId);
    List<ShoppingCart> list = shoppingCartService.list(lqw);

    if(list == null || list.size() == 0){
        throw new CustomException("购物车为空，无法完成订单");
    }

    //查询用户数据
    User user = userService.getById(currentId);

    //查询地址数据
    Long addressBookId = orders.getAddressBookId();
    AddressBook addressBook = addressBookService.getById(addressBookId);

    if(addressBook == null){
        throw new CustomException("用户地址信息有误，无法完成订单");
    }

    //生成订单号
    long orderId = IdWorker.getId();

    //原子操作，线程安全，多线程不会算错
    AtomicInteger amount = new AtomicInteger(0);

    List<OrderDetail> orderDetails = list.stream().map((item) -> {
        OrderDetail orderDetail = new OrderDetail();
        orderDetail.setOrderId(orderId);
        orderDetail.setNumber(item.getNumber());
        orderDetail.setDishFlavor(item.getDishFlavor());
        orderDetail.setDishId(item.getDishId());
        orderDetail.setSetmealId(item.getSetmealId());
        orderDetail.setName(item.getName());
        orderDetail.setImage(item.getImage());
        orderDetail.setAmount(item.getAmount());
        amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
        return orderDetail;
    }).collect(Collectors.toList());

    //向订单表插入数据，一条数据
    orders.setId(orderId);
    orders.setOrderTime(LocalDateTime.now());
    orders.setCheckoutTime(LocalDateTime.now());
    orders.setStatus(2);
    orders.setAmount(new BigDecimal(amount.get()));//总金额
    orders.setUserId(currentId);
    orders.setNumber(String.valueOf(orderId));
    orders.setUserName(user.getName());
    orders.setConsignee(addressBook.getConsignee());
    orders.setPhone(addressBook.getPhone());
    orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
            + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
            + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
            + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

    this.save(orders);

    //向订单明细表插入数据，多条数据
    orderDetailService.saveBatch(orderDetails);

    //清空购物车数据
    shoppingCartService.remove(lqw);
}
欢迎大家一起学习，有不足的地方还请指出。