优化下单流程
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docs/backend-order-service-example.java
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248
docs/backend-order-service-example.java
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/**
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* 订单服务实现类示例
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* 展示如何保存订单商品信息的业务逻辑
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*/
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@Service
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@Transactional(rollbackFor = Exception.class)
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public class ShopOrderServiceImpl implements ShopOrderService {
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@Autowired
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private ShopOrderMapper shopOrderMapper;
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@Autowired
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private OrderGoodsMapper orderGoodsMapper;
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@Autowired
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private ShopGoodsService shopGoodsService;
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@Autowired
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private ShopUserAddressService addressService;
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@Autowired
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private WxPayService wxPayService;
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/**
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* 创建订单
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*/
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@Override
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@Transactional(rollbackFor = Exception.class)
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public Map<String, String> createOrder(OrderCreateRequest request, User loginUser) {
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// 1. 参数校验
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validateOrderRequest(request, loginUser);
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// 2. 构建订单对象
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ShopOrder shopOrder = buildShopOrder(request, loginUser);
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// 3. 应用业务规则
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applyBusinessRules(shopOrder, loginUser);
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// 4. 保存订单主表
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boolean saved = shopOrderMapper.insert(shopOrder) > 0;
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if (!saved) {
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throw new BusinessException("订单保存失败");
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}
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// 5. 保存订单商品明细 - 核心业务逻辑
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saveOrderGoods(shopOrder, request.getGoodsItems());
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// 6. 创建微信支付订单
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try {
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return wxPayService.createWxOrder(shopOrder);
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} catch (Exception e) {
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log.error("创建微信支付订单失败，订单号：{}", shopOrder.getOrderNo(), e);
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throw new BusinessException("创建支付订单失败：" + e.getMessage());
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}
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}
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/**
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* 保存订单商品明细 - 核心实现
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*/
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private void saveOrderGoods(ShopOrder shopOrder, List<OrderGoodsItem> goodsItems) {
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List<OrderGoods> orderGoodsList = new ArrayList<>();
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BigDecimal totalPrice = BigDecimal.ZERO;
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int totalQuantity = 0;
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List<String> goodsNames = new ArrayList<>();
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for (OrderGoodsItem item : goodsItems) {
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// 1. 获取商品最新信息进行校验
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ShopGoods goods = shopGoodsService.getById(item.getGoodsId());
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if (goods == null) {
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throw new BusinessException("商品不存在：" + item.getGoodsId());
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}
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// 2. 商品状态校验
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if (goods.getIsShow() != 1) {
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throw new BusinessException("商品已下架：" + goods.getName());
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}
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// 3. 库存校验
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if (goods.getStock() < item.getQuantity()) {
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throw new BusinessException("商品库存不足：" + goods.getName());
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}
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// 4. 价格计算（以数据库中的价格为准）
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BigDecimal itemPrice = new BigDecimal(goods.getPrice());
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BigDecimal itemTotalPrice = itemPrice.multiply(new BigDecimal(item.getQuantity()));
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// 5. 构建订单商品记录
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OrderGoods orderGoods = new OrderGoods();
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orderGoods.setOrderId(shopOrder.getOrderId());
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orderGoods.setGoodsId(item.getGoodsId());
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orderGoods.setTotalNum(item.getQuantity());
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orderGoods.setPayPrice(itemTotalPrice.toString());
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orderGoods.setType(0); // 0商城
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orderGoods.setPayStatus("0"); // 0未付款
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orderGoods.setOrderStatus(0); // 0未完成
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orderGoods.setUserId(shopOrder.getUserId());
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orderGoods.setTenantId(shopOrder.getTenantId());
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orderGoods.setCreateTime(LocalDateTime.now());
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// 6. SKU信息处理（如果有规格）
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if (item.getSkuId() != null) {
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// 处理SKU相关逻辑
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// orderGoods.setSkuId(item.getSkuId());
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// orderGoods.setSpecInfo(item.getSpecInfo());
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}
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orderGoodsList.add(orderGoods);
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// 7. 累计计算
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totalPrice = totalPrice.add(itemTotalPrice);
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totalQuantity += item.getQuantity();
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goodsNames.add(goods.getName());
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// 8. 扣减库存（根据业务需求，可能在支付成功后扣减）
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if (goods.getDeductStockType() == 10) { // 10下单减库存
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goods.setStock(goods.getStock() - item.getQuantity());
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shopGoodsService.updateById(goods);
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}
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}
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// 9. 批量保存订单商品
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if (!orderGoodsList.isEmpty()) {
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orderGoodsMapper.insertBatch(orderGoodsList);
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}
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// 10. 更新订单总价和数量
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shopOrder.setTotalPrice(totalPrice.toString());
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shopOrder.setPayPrice(totalPrice.toString()); // 暂时不考虑优惠
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shopOrder.setTotalNum(totalQuantity);
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// 11. 生成订单标题（限制30个汉字）
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String title = generateOrderTitle(goodsNames);
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shopOrder.setTitle(title);
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// 12. 更新订单主表
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shopOrderMapper.updateById(shopOrder);
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}
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/**
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* 生成订单标题，限制长度不超过30个汉字
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*/
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private String generateOrderTitle(List<String> goodsNames) {
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if (goodsNames.isEmpty()) {
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return "商品订单";
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}
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String title;
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if (goodsNames.size() == 1) {
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title = goodsNames.get(0);
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} else {
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title = goodsNames.get(0) + "等" + goodsNames.size() + "件商品";
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}
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// 限制标题长度最多30个汉字
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if (title.length() > 30) {
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title = title.substring(0, 30);
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}
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return title;
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}
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/**
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* 参数校验
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*/
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private void validateOrderRequest(OrderCreateRequest request, User loginUser) {
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if (request.getGoodsItems() == null || request.getGoodsItems().isEmpty()) {
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throw new BusinessException("商品信息不能为空");
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}
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if (request.getAddressId() == null) {
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throw new BusinessException("收货地址不能为空");
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}
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// 校验收货地址是否属于当前用户
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ShopUserAddress address = addressService.getById(request.getAddressId());
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if (address == null || !address.getUserId().equals(loginUser.getUserId())) {
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throw new BusinessException("收货地址不存在或不属于当前用户");
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}
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// 校验商品数量
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for (OrderGoodsItem item : request.getGoodsItems()) {
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if (item.getGoodsId() == null || item.getQuantity() <= 0) {
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throw new BusinessException("商品信息不正确");
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}
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}
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}
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/**
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* 构建订单对象
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*/
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private ShopOrder buildShopOrder(OrderCreateRequest request, User loginUser) {
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ShopOrder shopOrder = new ShopOrder();
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// 基础信息
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shopOrder.setOrderNo(generateOrderNo());
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shopOrder.setType(0); // 0商城订单
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shopOrder.setChannel(0); // 0小程序
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shopOrder.setUserId(loginUser.getUserId());
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shopOrder.setTenantId(loginUser.getTenantId());
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// 用户信息
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shopOrder.setRealName(loginUser.getRealName());
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shopOrder.setPhone(loginUser.getPhone());
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// 地址信息
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ShopUserAddress address = addressService.getById(request.getAddressId());
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shopOrder.setAddressId(request.getAddressId());
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shopOrder.setAddress(address.getProvince() + address.getCity() +
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address.getRegion() + address.getAddress());
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// 支付信息
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shopOrder.setPayType(request.getPayType());
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shopOrder.setPayStatus(0); // 0未付款
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shopOrder.setOrderStatus(0); // 0未使用
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// 配送信息
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shopOrder.setDeliveryType(request.getDeliveryType());
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if (request.getSelfTakeMerchantId() != null) {
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shopOrder.setSelfTakeMerchantId(request.getSelfTakeMerchantId());
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}
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// 其他信息
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shopOrder.setComments(request.getComments());
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shopOrder.setCreateTime(LocalDateTime.now());
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return shopOrder;
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}
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/**
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* 应用业务规则
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*/
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private void applyBusinessRules(ShopOrder shopOrder, User loginUser) {
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// 设置默认标题（如果没有设置）
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if (shopOrder.getTitle() == null) {
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shopOrder.setTitle("商品订单");
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}
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// 其他业务规则...
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}
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/**
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* 生成订单号
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*/
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private String generateOrderNo() {
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return "SO" + System.currentTimeMillis() +
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String.format("%04d", new Random().nextInt(10000));
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}
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}
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