微服务之Feign的介绍与使用小结

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

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

@EnableFeignClients
@MapperScan("cn.itcast.order,mapper")
@SpringBootApplication
public class OrderApplication
public static void main(String[] args) [
SpringApplication.run(OrderApplication.class,args)

package cn.itcast.order.client;​
import cn.itcast.order.pojo.User;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.WEB.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
​@FeignClient("userservice")
public interface UserClient {   
  @GetMapping("/user/{id}")   
  User findById(@PathVariable("id") Long id);
 }

@Autowired
private UserClient userClient;
public Order query0rderById(Long orderId) 
//1.查询订单
Order order = orderMapper.findById(orderId);
//2. 利用Feign发起http请求 查询用户
Useruser = userClient.findById(order.getUserId());
//3.封装user到0rder
order.setUser(user);
// 4.返回
return order;