微服务 Eureka 服务发现/拉取

代码示例：

1. 修改service层代码：

@Service
public class OrderService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private RestTemplate restTemplate;

    public Order queryOrderById(Long orderId) {
        //查询订单
        Order order = orderMapper.findById(orderId);

        //String url = "http://localhost:8081/user/"+order.getUserId();
        String url = "http://userservice/user/" + order.getUserId();
        User user = restTemplate.getForObject(url, User.class);

        order.setUser(user);
        return order;
    }
}

2. 加 @LoadBalanced 注解

@SpringBootApplication
public class OrderServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderServiceApplication.class, args);
    }

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }

}