[SpringCloud系列008] SpringCloud之Feign

你的名字 2024-02-18 21:12 87阅读 0赞

**添加依赖**

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

**启动类**

@EnableDiscoveryClient
    @SpringBootApplication
    @EnableFeignClients
    public class ConsumerOrderApplication {
      public static void main(String[] args) {
        SpringApplication.run(ConsumerOrderApplication.class, args);
      }
    }

**OrderController**

@RestController
    public class OrderController {
      @Autowired
      private UserFeignClient userFeignClient;
      @Autowired
      private RefactorUserService refactorUserService;
    
      @GetMapping("/user/{id}")
      public User findById(@PathVariable Long id) {
        return userFeignClient.findById(id);
      }
      
      @GetMapping("/user-extends/{id}")
      public User findById2(@PathVariable Long id) {
    	  return refactorUserService.getUser(id);
      }
      
    }

**feign**

@FeignClient(name = "microservice-provider-user")
    public interface UserFeignClient {
      @RequestMapping(value = "/{id}", method = RequestMethod.GET)
      public User findById(@PathVariable("id") Long id);
    }

**user服务端配置**

server:
      port: 8010
    spring:
      application:
        name: microservice-consumer-order
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
      instance:
        prefer-ip-address: true

**Eureka配置**

server:
      port: 8761                    # 指定该Eureka实例的端口
    eureka:
      client:
        registerWithEureka: false
        fetchRegistry: false
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
    
    # 参考文档：http://projects.spring.io/spring-cloud/docs/
                1.0.3/spring-cloud.html#_standalone_mode
    # 参考文档：http://my.oschina.net/buwei/blog/618756

**使用feign建立抽象接口工程**

//另外的工程,先构建,后引入
    public interface UserService {
      @GetMapping("/user/{id}")
      public User getUser(@PathVariable(value = "id") Long id);
    }

**主工程引入**

import com.tuling.cloud.study.service.UserService;
    import org.springframework.cloud.netflix.feign.FeignClient;
    @FeignClient(name = "microservice-provider-user")
    public interface RefactorUserService extends UserService {
    
    }