Day8：用户下单、微信支付

a. 用户下单

创建OrderController并提供用户下单方法：

/**
 * 用户下单
 * @param ordersSubmitDTO
 * @return
 */
@PostMapping("/submit")
@ApiOperation("用户下单")
public Result<OrderSubmitVO> submit(@RequestBody OrdersSubmitDTO ordersSubmitDTO){
    log.info("用户下单，参数为：{}",ordersSubmitDTO);
    OrderSubmitVO orderSubmitVO = orderService.submit(ordersSubmitDTO);
    return Result.success(orderSubmitVO);
}

创建OrderServiceImpl，并实现用户下单方法，及其父类接口

@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {

        // 处理各种业务异常（地址为空，购物车数据为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        // 查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        // 向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        // 向订单明细表插入n条数据
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail(); // 订单明细
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId()); // 设置当前订单明细关联的订单id
            orderDetailList.add(orderDetail);
        }
        
        orderDetailMapper.insertBatch(orderDetailList);

        // 下单成功，清空用户购物车
        shoppingCartMapper.deleteByUserId(userId);

        // 封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();
        
        return orderSubmitVO;
    }
}

创建OrderMapper接口和对应的xml映射文件：

// OrderMapper.java
@Mapper
public interface OrderMapper {

    /**
     * 插入订单数据
     * @param orders
     */
    void insert(Orders orders);
}

// OrderMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sky.mapper.OrderDetailMapper">
    <insert id="insertBatch">
        insert into order_detail (name, image, order_id, dish_id, setmeal_id, dish_flavor, number, amount)
        VALUES
        <foreach collection="orderDetailList" item="od" separator=",">
            (#{od.name}, #{od.image}, #{od.orderId}, #{od.dishId}, #{od.setmealId}, #{od.dishFlavor}, #{od.number}, #{od.amount})
        </foreach>
    </insert>
</mapper>

创建OrderDetailMapper接口和对应的xml映射文件：

// OrderDetailMapper.java
@Mapper
public interface OrderDetailMapper {
    /**
     * 批量插入订单明细数据
     * @param orderDetailList
     */
    void insertBatch(List<OrderDetail> orderDetailList);
}

// OrderDetailMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sky.mapper.OrderDetailMapper">
    <insert id="insertBatch">
        insert into order_detail (name, image, order_id, dish_id, setmeal_id, dish_flavor, number, amount)
        VALUES
        <foreach collection="orderDetailList" item="od" separator=",">
            (#{od.name}, #{od.image}, #{od.orderId}, #{od.dishId}, #{od.setmealId}, #{od.dishFlavor}, #{od.number}, #{od.amount})
        </foreach>
    </insert>
</mapper>

b. 微信支付

注意：个人小程序无法申请微信支付功能

获取微信支付平台证书、商户私钥文件：
这两个文件需在小程序网站上下载

微信支付相关配置：


在application.yml中，写入相关读取配置，并在application-dev.yml中写入具体参数

# application.yml
sky:  
    wechat:
        appid: ${sky.wechat.appid}
        secret: ${sky.wechat.secret}
        mchid: ${sky.wechat.mchid}
        mchSerialNo: ${sky.wechat.mchSerialNo}
        privateKeyFilePath: ${sky.wechat.privateKeyFilePath}
        apiV3Key: ${sky.wechat.apiV3Key}
        weChatPayCertFilePath: ${sky.wechat.weChatPayCertFilePath}
        notifyUrl: ${sky.wechat.notifyUrl}
        refundNotifyUrl: ${sky.wechat.refundNotifyUrl}