订单处理-cnblog

4.5 代码开发

在OrderController中创建submit方法,处理用户下单的逻辑 :

/**
* 用户下单
* @param orders
* @return
*/
@PostMapping("/submit")
public R<String> submit(@RequestBody Orders orders){
log.info("订单数据:{}",orders);
orderService.submit(orders);
return R.success("下单成功");
}

由于下单的逻辑相对复杂,我们可以在OrderService中定义submit方法,来处理下单的具体逻辑:

/**
* 用户下单
* @param orders
*/
public void submit(Orders orders);

然后在OrderServiceImpl中完成下单功能的具体实现,下单功能的具体逻辑如下:

A. 获得当前用户id, 查询当前用户的购物车数据

B. 根据当前登录用户id, 查询用户数据

C. 根据地址ID, 查询地址数据

D. 组装订单明细数据, 批量保存订单明细

E. 组装订单数据, 批量保存订单数据

F. 删除当前用户的购物车列表数据

具体代码实现如下:

@Autowired
private ShoppingCartService shoppingCartService;
@Autowired
private UserService userService;
@Autowired
private AddressBookService addressBookService;
@Autowired
private OrderDetailService orderDetailService;
/**
* 用户下单
* @param orders
*/
@Transactional
public void submit(Orders orders) {
//获得当前用户id
Long userId = BaseContext.getCurrentId();
//查询当前用户的购物车数据
LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
wrapper.eq(ShoppingCart::getUserId,userId);
List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);
if(shoppingCarts == null || shoppingCarts.size() == 0){
throw new CustomException("购物车为空,不能下单");
}
//查询用户数据
User user = userService.getById(userId);
//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,不能下单");
}
long orderId = IdWorker.getId();//订单号
AtomicInteger amount = new AtomicInteger(0);
//组装订单明细信息
List<OrderDetail> orderDetails = shoppingCarts.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());
//组装订单数据
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(userId);
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()));
//向订单表插入数据,一条数据
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(wrapper);
}

备注:

​ 上述逻辑处理中,计算购物车商品的总金额时,为保证我们每一次执行的累加计算是一个原子操作,我们这里用到了JDK中提供的一个原子类 AtomicInteger

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