一、準備工作，eclipse執行兩個例項

1、修改  eurekaclient1 中 application.yml 檔案

server:
  port: 8762
spring:
  application:
    name: eurekaclient
eureka:
  instance:
     instance-id: eurekaclient1
     appname: ${spring.application.name}
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
 

 

2、同級目錄下複製一份 application.yml 檔案 命名為  application-two.yml

server:
  port: 8763
spring:
  application:
    name: eurekaclient
eureka:
  instance:
     instance-id: eurekaclient2
     appname: ${spring.application.name}
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
 

3、啟動  EurekaClientApplication.java （第一個例項）

4、啟動 EurekaClientApplication.java  （第二個例項）

右鍵->Run As  -> Run Configurations.. ->Arguments-> Programe Arguments 輸入 --spring.profiles.active=two   點選 run

5、檢視 多個例項

6、http://localhost:8761

 

二、新建maven 工程 service-ribbon （服務消費者 ）

1、修改pom.xml

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>wg</groupId>
  <artifactId>service-ribbon</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>service-ribbon</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    <java.version>1.8</java.version>
  </properties>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <dependencies>
	<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </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>
</project>

2、建立啟動類（位於所有類的上級包下）

package wg;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

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

    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

3、建立application.yml

server:
  port: 8764
spring:
  application:
    name: service-ribbon
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

4、建立service 

package wg.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class HelloService {
	@Autowired
    RestTemplate restTemplate;

    public String helloService() {
        return restTemplate.getForObject("http://EUREKACLIENT/",String.class);
    }
}

5、建立controller

package wg.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import wg.service.HelloService;

@RestController
public class HelloController {
	@Autowired
    HelloService helloService;

    @RequestMapping(value = "/hello")
    public String hi() {
        return helloService.helloService( );
    }
}

6、啟動專案，多次訪問：http://localhost:8764/hello

交替出現

7、訪問 http://localhost:8761/

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