Spring注解之Service用法及示例详解

public interface OrderService {
    Order createOrder(Order order);
    Order getOrderDetails(String orderId);
}

@Service
public class OrderServiceImpl implements OrderService {
    @Override
    public Order createOrder(Order order) {
        // 在这里执行创建订单的业务逻辑
        return order;
    }
    @Override
    public Order getOrderDetails(String orderId) {
        // 在这里执行查询订单详情的业务逻辑
        return new Order();
    }
}
}

@RestController
public class OrderController {
    @Autowired
    private OrderService orderService;
    @PostMapping("/orders")
    public Order createOrder(@RequestBody Order order) {
        return orderService.createOrder(order);
    }
    @GetMapping("/orders/{orderId}")
    public Order getOrderDetails(@PathVariable String orderId) {
        return orderService.getOrderDetails(orderId);
    }
}

public class OrderController {
    private OrderService orderService = new OrderServiceImpl();
    public Order createOrder(Order order) {
        return orderService.createOrder(order);
    }
    public Order getOrderDetails(String orderId) {
        return orderService.getOrderDetails(orderId);
    }
}

@Service
public class PaymentService {
    @Autowired
    private OrderService orderService;
    public void processPayment(long orderId) {
        // 调用订单服务以获取订单详细信息
        Order order = orderService.getOrderById(orderId);
        // 执行付款操作
        ...
    }
}