微服务根据业务模块拆分服务，并通过远程调用进行交互

package cn.itcast.order.service; import cn.itcast.order.mapper.OrderMapper; import cn.itcast.order.pojo.Order; import cn.itcast.order.pojo.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Service; import org.springframework.web.client.RestTemplate; @Service public class OrderService { @Autowired private OrderMapper orderMapper; @Autowired private RestTemplate restTemplate; public Order queryOrderById(Long orderId) { // 1.查询订单 Order order = orderMapper.findById(orderId); // 2.用户服务请求路径 String url = "http://localhost:8081/user/" + order.getUserId(); // 3.根据id查询用户信息 ResponseEntity<User> user = restTemplate.getForEntity(url, User.class); order.setUser(user.getBody()); // 4.返回 return order; } }