<!-- 需要確定 Spring Cloud 版本 -->
<dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
 <groupId>org.springframework.cloud</groupId>
 <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <packaging>pom</packaging>
 <modules>
 <module>eureka</module>
 </modules>
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.2.10.RELEASE</version>
 <relativePath/> <!-- lookup parent from repository -->
 </parent>
 <groupId>com.software</groupId>
 <artifactId>spring-cloud</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <name>spring-cloud</name>
 <description>Demo project for Spring Boot</description>

 <properties>
 <java.version>1.8</java.version>
 <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
 </properties>

 <dependencies>
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
 </dependency>
 <!-- 演示就不使用數(shù)據(jù)庫(kù)了 -->
		<!--<dependency>-->
		<!--<groupId>org.springframework.boot</groupId>-->
		<!--<artifactId>spring-boot-starter-data-jpa</artifactId>-->
		<!--</dependency>-->
 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <!-- H 版 Spring Cloud 將 server 與 client 分開了，需要導(dǎo)入兩個(gè)坐標(biāo) -->
 <dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
 </dependency>
 <dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
 </dependency>
 </dependencies>

 <dependencyManagement>
 <dependencies>
  <dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-dependencies</artifactId>
  <version>${spring-cloud.version}</version>
  <type>pom</type>
  <scope>import</scope>
  </dependency>
 </dependencies>
 </dependencyManagement>

 <build>
 <plugins>
  <plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
  </plugin>
 </plugins>
 </build>

</project>

/**
 * Created with IntelliJ IDEA.
 *
 * @author Demo_Null
 * @date 2020/10/29
 * @description Eureka 啟動(dòng)類
 */
@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
 public static void main(String[] args) {
 SpringApplication.run(EurekaApplication.class, args);
 }
}

server:
 port: 8081

spring:
 application:
 name: eurekaServer # 應(yīng)用名稱，在 Eureka 中作為 id 標(biāo)識(shí)

eureka:
 client:
 register-with-eureka: false # 不注冊(cè)自己
 fetch-registry: false # 不拉取自己
 service-url:
 defaultZone: http://127.0.0.1:8081/eureka/ # EurekaServer 的地址，如果是集群，需要加上其它 Server 的地址

/**
 * Created with IntelliJ IDEA.
 *
 * @author Demo_Null
 * @date 2020/10/29
 * @description 服務(wù)提供者啟動(dòng)類
 */
@SpringBootApplication
@EnableDiscoveryClient
public class ProviderApplication {
 public static void main(String[] args) {
 SpringApplication.run(ProviderApplication.class, args);
 }
}

server:
 port: 8082

spring:
 application:
 name: ProviderServer # 應(yīng)用名稱，在 Eureka 中作為 id 標(biāo)識(shí)

eureka:
 client:
 service-url:
 defaultZone: http://127.0.0.1:8081/eurake/

/**
 * Created with IntelliJ IDEA.
 *
 * @author Demo_Null
 * @date 2020/10/29
 * @description
 */

@RestController
@RequestMapping("/provider")
public class ProviderController {

 @GetMapping("/get")
 public Object get() {
 return "你已經(jīng)消費(fèi)了";
 }
}

/**
 * Created with IntelliJ IDEA.
 *
 * @author Demo_Null
 * @date 2020/10/29
 * @description 消費(fèi)者啟動(dòng)類
 */
@SpringBootApplication
@EnableDiscoveryClient
public class ConsumerApplication {
 public static void main(String[] args) {
 SpringApplication.run(ConsumerApplication.class, args);
 }
	
	// 將 RestTemplate 交由容器管理
 @Bean
 public RestTemplate getRestTemplate() {
 return new RestTemplate();
 }
}

server:
 port: 8083

spring:
 application:
 name: ConsumerServer # 應(yīng)用名稱，在 Eureka 中作為 id 標(biāo)識(shí)

eureka:
 client:
 service-url:
 defaultZone: http://127.0.0.1:8081/eureka

/**
 * Created with IntelliJ IDEA.
 *
 * @author gaohu9712@163.com
 * @date 2020/10/29
 * @description
 */
@RestController
@RequestMapping("/consumer")
public class ConsumerController {

 @Autowired
 private DiscoveryClient discoveryClient;


 @GetMapping("/go")
 public void go() {
 List<ServiceInstance> providerServer = discoveryClient.getInstances("ProviderServer");

 if (0 == providerServer.size()) {
  return;
 }

 ServiceInstance serviceInstance = providerServer.get(0);
 String host = serviceInstance.getHost();
 int port = serviceInstance.getPort();
 URI uri = serviceInstance.getUri();
 System.out.println("主機(jī)：" + host);
 System.out.println("端口：" + port);
 System.out.println("uri：" + uri);

 RestTemplate restTemplate = new RestTemplate();
 String str = restTemplate.getForObject(uri + "/provider/get", String.class);
 System.out.println(str);
 }
}

eureka:
 instance:
 # 實(shí)例名稱
 instance-id: consumer-01
 # 地址中顯示 ip 
 prefer-ip-address: true

# Eureka Server 配置
eureka:
 server:
 # 關(guān)閉自我保護(hù)模式, 默認(rèn)為打開
 enable-self-preservation: false 
 # 續(xù)期時(shí)間，即掃描失效服務(wù)的間隔時(shí)間 
 eviction-interval-timer-in-ms: 5000 


# Eureka Client 配置
eureka:
 instance:
 # Eureka Client 給 Eureka Server 發(fā)送心跳的時(shí)間間隔，默認(rèn) 30 單位是 s
 lease-renewal-interval-in-seconds: 1
 # Eureka Server 最后一次收到心跳的等待上限，超時(shí)剔除服務(wù)，默認(rèn) 90 單位是 s
 lease-expiration-duration-in-seconds: 2

server:
 port: 8081

spring:
 application:
 name: eurekaServer

eureka:
 client:
 register-with-eureka: false
 fetch-registry: false
 service-url:
 defaultZone: http://127.0.0.1:8082/eureka
 server:
 enable-self-preservation: false
 eviction-interval-timer-in-ms: 5000

server:
 port: 8082

spring:
 application:
 name: eurekaServer_back

eureka:
 client:
 register-with-eureka: false
 fetch-registry: false
 service-url:
 defaultZone: http://127.0.0.1:8081/eureka
 server:
 enable-self-preservation: false
 eviction-interval-timer-in-ms: 5000

server:
 port: 8091

spring:
 application:
 name: ProviderServer # 應(yīng)用名稱，在 Eureka 中作為 id 標(biāo)識(shí)

eureka:
 client:
 service-url:
 defaultZone: http://127.0.0.1:8081/eureka, http://127.0.0.1:8082/eureka
 instance:
 instance-id: provider-prim
 prefer-ip-address: true
 lease-renewal-interval-in-seconds: 1
 lease-expiration-duration-in-seconds: 2

server:
 port: 8092

spring:
 application:
 name: ProviderServer

eureka:
 client:
 service-url:
 defaultZone: http://127.0.0.1:8081/eureka, http://127.0.0.1:8082/eureka
 instance:
 instance-id: provider-back
 prefer-ip-address: true
 lease-renewal-interval-in-seconds: 1
 lease-expiration-duration-in-seconds: 2

/**
 * Created with IntelliJ IDEA.
 *
 * @author Demo_Null
 * @date 2020/10/29
 * @description
 */
@RestController
@RequestMapping("/consumer")
public class ConsumerController {

 @Autowired
 private DiscoveryClient discoveryClient;


 @GetMapping("/go")
 public void go() {
 List<ServiceInstance> providerServer = discoveryClient.getInstances("ProviderServer");

 if (0 == providerServer.size()) {
  return;
 }

 RestTemplate restTemplate = new RestTemplate();

 for (ServiceInstance instance : providerServer) {
  System.out.print(instance.getUri() + "---");
  String url = instance.getUri() + "/provider/get";
  System.out.println(restTemplate.getForObject(url, String.class));
 }
 }
}