服务发现Discovery

对于注册进eureka里面的微服务，可以通过服务发现来获得该服务的信息

1、修改cloud-provider-payment8001的controller


import com.my.springcloud.utils.RestResponse;
import com.my.springcloud.entities.Payment;
import com.my.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.TimeUnit;@RestController
@Slf4j
public class PaymentController {@Resourceprivate DiscoveryClient discoveryClient;/*** Discovery服务发现*/@GetMapping(value = "/payment/discovery")public Object discovery() {// 第一种方式：获取所有服务List<String> services = discoveryClient.getServices();// 遍历每一个服务for (String element : services) {log.info("*****element: " + element);}// 第二种方式：获取键名下的所有服务List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");// 遍历每一个服务for (ServiceInstance instance : instances) {log.info(instance.getServiceId() + "\t" + instance.getHost() + "\t" + instance.getPort() + "\t" + instance.getUri());}return this.discoveryClient;}}

2、主启动类上加上@EnableDiscoveryClient注解

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;@SpringBootApplication
@EnableEurekaClient   //Eureka客户端
@EnableDiscoveryClient //启动服务发现
public class PaymentMain8001 {public static void main(String[] args) {SpringApplication.run(PaymentMain8001.class, args);}
}