这篇文章主要介绍了SpringCloud搭建netflix-eureka微服务集群的过程详解,本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
目录
1.打开官网稍微学习一下，了解一下spring cloud是个什么东西，大概有哪些组件等
2.新建项目
3.更改项目结构
4.新建相应的测试类和配置文件
4.1 register-center模块
4.2 provider模块
4.3 consumer配置
5.运行测试
5.1本机hosts配置
5.2 编辑运行配置
5.3 运行程序
1.打开官网稍微学习一下，了解一下spring cloud是个什么东西，大概有哪些组件等
https://spring.io/projects/spring-cloud
https://docs.spring.io/spring-cloud-netflix/docs/current/reference/html/
2.新建项目
打开网址：https://start.spring.io/
选择需要引入的组件，然后下载下来即可
3.更改项目结构
为了测试的方便，需将项目结构更改为多模块的项目。
步骤如下：
(1) 依次新建子模块register-center/provider/consumer，删除父模块中多余的src、target等文件夹
(2) 修改父模块的pom文件：仅保留配置节，配置节全部注释掉，因为可在子模块按需添加依赖。
(3) 修改register-center的pom中的依赖配置
org.springframework.cloudspring-cloud-starter-netflix-eureka-server
(4) 修改provider和consumer的pom中依赖配置
org.springframework.bootspring-boot-starter-weborg.springframework.cloudspring-cloud-starter-netflix-eureka-client
4.新建相应的测试类和配置文件
4.1 register-center模块
启动类
package com.hdwang.springcloudtest.registercenter; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @SpringBootApplication @EnableEurekaServer public class Application { /** * 运行点对点模式（集群模式）时，通过添加VM参数启动不同的注册中心节点实例 * 例如：-Dspring.profiles.active=peer2 * * @param args */ public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
spring: application: #应用名 name: register-center freemarker: template-loader-path: classpath:/templates/ prefer-file-system-access: false #激活的配置，可运行时添加参数进行修改 -Dspring.profiles.active=peer2 profiles: active: peer1 # #Eureka独立模式配置，仅有一个注册中心节点 #server: # port: 8090 #eureka: # instance: # hostname: localhost # client: # #仅仅作为注册中心，既不提供服务也不订阅服务 # registerWithEureka: false # fetchRegistry: false # #注册中心地址 # serviceUrl: # defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ # Eureka点对点模式，保证注册中心高可用，注册的实例信息会在点与点之间相互同步 eureka: client: serviceUrl: defaultZone: http://peer1.com:8091/eureka/,http://peer2.com:8092/eureka/,http://peer3.com:8093/eureka/ --- #每个注册中心节点不同的配置 spring: profiles: peer1 server: port: 8091 eureka: instance: #在本机hosts中配置即可 hostname: peer1.com --- spring: profiles: peer2 server: port: 8092 eureka: instance: hostname: peer2.com --- spring: profiles: peer3 server: port: 8093 eureka: instance: hostname: peer3.com
4.2 provider模块
启动类
package com.hdwang.springcloudtest.provider; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { /** * 运行时添加VM参数: -Dserver.port=8082可以启动多个provider实例 * * @param args */ public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
服务注册类
package com.hdwang.springcloudtest.provider.restservice; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * 注册的服务 */ @RestController public class RestService { /** * 日志 */ private static final Logger LOG = LoggerFactory.getLogger(RestService.class); @RequestMapping("/sayHello") public String sayHello(String name) { LOG.info("sayHello was called"); return "hello, " + name; } }
spring: application: #应用名，也是eureka的服务名 name: provider freemarker: template-loader-path: classpath:/templates/ prefer-file-system-access: false server: #运行时，添加参数-Dserver.port=8082运行新的provider实例 port: 8081 eureka: client: #注册中心地址 serviceUrl: #注册中心独立模式 #defaultZone: http://localhost:8090/eureka/ #注册中心点对点模式 defaultZone: http://peer1.com:8091/eureka/,http://peer2.com:8092/eureka/,http://peer3.com:8093/eureka/
4.3 consumer配置
启动类
package com.hdwang.springcloudtest.consumer; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }
服务调用测试类
package com.hdwang.springcloudtest.consumer.controller; import com.netflix.appinfo.InstanceInfo; import com.netflix.discovery.EurekaClient; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.httpentity; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.util.LinkedMultiValueMap; import org.springframework.util.MultiValueMap; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate; import java.util.*; /** * 测试 */ @RestController public class TestController { /** * 使用服务名才能负载均衡，不能使用直接使用地址 */ private static final String REST_URL_PREFIX = "http://provider"; @Autowired private EurekaClient discoveryClient; @Autowired private RestTemplate restTemplate; @GetMapping("/testGet") public String testGet() { ResponseEntity res = restTemplate.getForEntity(REST_URL_PREFIX + "/sayHello?name={1}", String.class, getName()); return res.getBody(); } @GetMapping("/testPost") public String testPost() { MultiValueMap params = new LinkedMultiValueMap(); params.add("name", getName()); // HttpHeaders headers = new HttpHeaders(); // headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED); httpentity> request = new httpentity(params, null); ResponseEntity res = restTemplate.postForEntity(REST_URL_PREFIX + "/sayHello", request, String.class); return res.getBody(); } private String getName() { List greetings = Arrays.asList("Bob", "Alice", "Jack"); Random rand = new Random(); int randomNum = rand.nextInt(greetings.size()); return greetings.get(randomNum); } }
RestTemplate负责均衡配置类
package com.hdwang.springcloudtest.consumer.config; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.client.RestTemplate; @Configuration public class RestTemplateConfig { /** * 构建有负载均衡功能的RestTemplate实例对象 * * @return RestTemplate实例对象 */ @Bean @LoadBalanced RestTemplate restTemplate() { return new RestTemplate(); } }
spring: application: #应用名，也是Eureka的服务名 name: cosumer server: port: 8088 eureka: client: #注册中心地址 serviceUrl: #注册中心独立模式 #defaultZone: http://localhost:8090/eureka/ #注册中心点对点模式 defaultZone: http://peer1.com:8091/eureka/,http://peer2.com:8092/eureka/,http://peer3.com:8093/eureka/
5.运行测试
5.1本机hosts配置
127.0.0.1 peer1.com
127.0.0.1 peer2.com
127.0.0.1 peer3.com
5.2 编辑运行配置
三个注册中心节点运行配置
两个服务提供者的运行配置
5.3 运行程序
(1) 启动注册中心
依次启动RegisterCenter1->RegisterCenter2->RegisterCenter3，启动成功后，可访问http://localhost:8091/ 或http://localhost:8092/ 或http://localhost:8093/ 查看是否启动成功
(2)启动服务提供者provider
依次启动Provider1->Provider2, 随便访问一个注册中心地址首页即可查看状态，如下图
(3) 启动消费者cosumer
(4) 在浏览器中进行测试
测试地址：http://localhost:8088/testPost / http://localhost:8088/testGet
(5) 在Provider1/Provider2的控制台中可以看到输出结果
2021-04-07 15:26:56.043 INFO 8796 --- [nio-8081-exec-1] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:26:58.860 INFO 8796 --- [nio-8081-exec-2] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:26:59.535 INFO 8796 --- [nio-8081-exec-3] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:26:59.925 INFO 8796 --- [nio-8081-exec-4] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:27:00.266 INFO 8796 --- [nio-8081-exec-5] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:27:00.663 INFO 8796 --- [nio-8081-exec-6] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:27:00.938 INFO 8796 --- [nio-8081-exec-7] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:26:58.602 INFO 17828 --- [nio-8082-exec-1] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:26:59.194 INFO 17828 --- [nio-8082-exec-2] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:26:59.737 INFO 17828 --- [nio-8082-exec-3] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:27:00.109 INFO 17828 --- [nio-8082-exec-4] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:27:00.414 INFO 17828 --- [nio-8082-exec-5] c.h.s.provider.restservice.RestService : sayHello was called
2021-04-07 15:27:00.815 INFO 17828 --- [nio-8082-exec-6] c.h.s.provider.restservice.RestService : sayHello was called
恭喜！至此，Spring Clound 微服务集群框架您已经搭建成功！
附录
github地址：https://github.com/hdwang123/springcloudtest
参考文章：
https://www.zhihu.com/question/283286745/answer/763040709
https://www.cnblogs.com/qdhxhz/p/9357502.html
https://www.cnblogs.com/cjsblog/p/8005766.html
https://blog.csdn.net/weixin_44448094/article/details/88535475
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