//value中对应服务提供方的名字（value值表示调用服务的名称）
@FeignClient(value = "SPRINGCLOUD-PROVIDER-DEPT")
@Component //注入到容器中
public interface DeptClientService {
    /**
     * 接口中的三个方法对应服务提供者的三个方法
     * 这里面的接口对应服务提供者的controller接口，名称必须一致，然后接口的Mapping映射url必须一致
     * @param dept
     * @return
     */
    @PostMapping("/dept/add")
    public boolean addDept(Dept dept);
    @GetMapping("/dept/queryById/{id}")
    public Dept queryById(@PathVariable("id") Long id);
    @GetMapping("/dept/queryAll")
    public List<Dept> queryAll();
}

 <!--引入feign：版本和ribbon相同-->
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-feign</artifactId>
     <version>1.4.6.RELEASE</version>
 </dependency>
 <!--引入Ribbon相关：ribbon->eureka->config-->
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-ribbon</artifactId>
     <version>1.4.6.RELEASE</version>
 </dependency>
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-config</artifactId>
 </dependency>
 <!--微服务provider方引入eureka-->
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <!--没有带sever表示就是client客户端-->
     <artifactId>spring-cloud-starter-eureka</artifactId>
     <version>1.4.6.RELEASE</version>
 </dependency>
<dependency>
    <groupId>com.fengye</groupId>
    <artifactId>springcloud-api</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

server:
  port: 81
#spring的配置
spring:
  application:
    name: springcloud-consumer-dept  #默认注册进eureka中的实例名称（显示大写）
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/springcloud_db01?useUnicode=true&characterEncoding=utf-8
    username: root
    password: admin
#eureka的配置，确定客户端服务注册到eureka服务列表内
eureka:
  client:
    register-with-eureka: false  #表示是否向Eureka注册中心注册自己，false表示不注册自己
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/

@RestController
public class DeptConsumerController {
    @Autowired
    private DeptClientService deptClientService;  //注入api中公共接口，面向接口调用服务
    @RequestMapping("/consumer/dept/add")
    public boolean add(Dept dept){
        return deptClientService.addDept(dept);
    }
    @RequestMapping("/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id){
        Dept result = deptClientService.queryById(id);
        System.out.println("客户端请求：data from port= " + result.getDname());
        return result;
    }
    @RequestMapping("/consumer/dept/list")
    public List<Dept> list(){
        return deptClientService.queryAll();
    }
}

@SpringBootApplication
@EnableEurekaClient  //标识这是一个eureka的client客户端
@EnableFeignClients(basePackages = {"com.fengye.springcloud"})  //扫描哪个包下面的Feign注解
public class DeptServiceFeignConsumer {
    public static void main(String[] args) {
        SpringApplication.run(DeptServiceFeignConsumer.class, args);
    }
}