服务发现(Feign)

1. 【服务中心】集群，Eureka Server

2. 【服务提供者】集群，Eureka Client

3. 【服务消费者】，Eureka Discovery Client(Feign)
   3.1 pom文件:

    
        org.springframework.boot
        spring-boot-starter-web
    
    
        org.springframework.cloud
        spring-cloud-starter-openfeign
    
    
        org.springframework.cloud
        spring-cloud-starter-netflix-eureka-client
    
   

   3.2 启动类&&Service层&&控制层

   启动类:

    @SpringBootApplication
    @EnableFeignClients         //启动Feign
    @EnableDiscoveryClient      //启动Eureka服务发现
    public class EurekaFeignApplication {
        public static void main(String[] args) {
            SpringApplication.run(EurekaFeignApplication.class, args);
        }
    }
   

   Service层:

    @FeignClient(value = "eureka-client")   //调用的服务名称
    public interface EurekaFeignService {
        @RequestMapping("/info")
        String getInfo();
    }
   

   控制层:

    @RestController
    public class EurekaFeignController {
        @Resource
        private EurekaFeignService eurekaFeignService;
        @RequestMapping("/feignInfo")
        public String feignInfo() {
            String message = eurekaFeignService.getInfo();
            return "获取的信息:  " + message;
        }
    }
   

   3.3 配置文件yml

    server:
      port: 52620
    spring:
      application:
        name: eureka-discovery-feign
    eureka:
      instance:
        hostname: localhost
        lease-renewal-interval-in-seconds: 5
        lease-expiration-duration-in-seconds: 10
      client:
        service-url:
          defaultZone:  http://localhost:8081/eureka,http://localhost:8082/eureka,http://localhost:803/eureka
   

4. 启动【服务消费者】工程

5. 访问服务中心,查看注册实例

6. 访问地址http://localhost:52620/feignInfo，多刷新几次，查看变化
   【服务消费者】完成！！！