在orderservice子工程中

  <!--feign的远程-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

启动类加上这个注解

@EnableFeignClients //自动装配的开关

@MapperScan("cn.itcast.order.mapper")
@SpringBootApplication
@EnableFeignClients //自动装配的开关
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }

}

在orderservice中华编写接口加上调用服务的名称@FeignClient(“userservice”) 调用userservice

@FeignClient("userservice")
public interface UserClient {

  @GetMapping("/user/{id}")
  User findById(@PathVariable("id") Long id);

}

@Service
public class OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired

    private UserClient userClient;

    public Order queryOrderById(Long orderId) {
        // 1.查询订单
        Order order = orderMapper.findById(orderId);
       User user= userClient.findById(order.getUserId());
        order.setUser(user);
        System.out.println(user);
        // 4.返回
        return order;
    }
}