SpringCloud搭建netflix-eureka微服務(wù)集群的過程詳解
1.打開官網(wǎng)稍微學(xué)習(xí)一下,了解一下spring cloud是個什么東西,大概有哪些組件等
https://spring.io/projects/spring-cloud
https://docs.spring.io/spring-cloud-netflix/docs/current/reference/html/
2.新建項目
打開網(wǎng)址:https://start.spring.io/
選擇需要引入的組件,然后下載下來即可

3.更改項目結(jié)構(gòu)
為了測試的方便,需將項目結(jié)構(gòu)更改為多模塊的項目。

步驟如下:
(1) 依次新建子模塊register-center/provider/consumer,刪除父模塊中多余的src、target等文件夾
(2) 修改父模塊的pom文件:僅保留<dependencyManagement>配置節(jié),<dependencies>配置節(jié)全部注釋掉,因為可在子模塊按需添加依賴。

(3) 修改register-center的pom中的依賴配置
<dependencies>
<!-- Eureka注冊中心 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
</dependencies>
(4) 修改provider和consumer的pom中依賴配置
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
</dependencies>
4.新建相應(yīng)的測試類和配置文件
4.1 register-center模塊

啟動類
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 {
/**
* 運行點對點模式(集群模式)時,通過添加VM參數(shù)啟動不同的注冊中心節(jié)點實例
* 例如:-Dspring.profiles.active=peer2
*
* @param args
*/
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
yml配置
spring:
application:
#應(yīng)用名
name: register-center
freemarker:
template-loader-path: classpath:/templates/
prefer-file-system-access: false
#激活的配置,可運行時添加參數(shù)進行修改 -Dspring.profiles.active=peer2
profiles:
active: peer1
# #Eureka獨立模式配置,僅有一個注冊中心節(jié)點
#server:
# port: 8090
#eureka:
# instance:
# hostname: localhost
# client:
# #僅僅作為注冊中心,既不提供服務(wù)也不訂閱服務(wù)
# registerWithEureka: false
# fetchRegistry: false
# #注冊中心地址
# serviceUrl:
# defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
# Eureka點對點模式,保證注冊中心高可用,注冊的實例信息會在點與點之間相互同步
eureka:
client:
serviceUrl:
defaultZone: http://peer1.com:8091/eureka/,http://peer2.com:8092/eureka/,http://peer3.com:8093/eureka/
---
#每個注冊中心節(jié)點不同的配置
spring:
profiles: peer1
server:
port: 8091
eureka:
instance:
#在本機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模塊

啟動類
package com.hdwang.springcloudtest.provider;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
/**
* 運行時添加VM參數(shù): -Dserver.port=8082可以啟動多個provider實例
*
* @param args
*/
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
服務(wù)注冊類
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;
/**
* 注冊的服務(wù)
*/
@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;
}
}
yml配置
spring:
application:
#應(yīng)用名,也是eureka的服務(wù)名
name: provider
freemarker:
template-loader-path: classpath:/templates/
prefer-file-system-access: false
server:
#運行時,添加參數(shù)-Dserver.port=8082運行新的provider實例
port: 8081
eureka:
client:
#注冊中心地址
serviceUrl:
#注冊中心獨立模式
#defaultZone: http://localhost:8090/eureka/
#注冊中心點對點模式
defaultZone: http://peer1.com:8091/eureka/,http://peer2.com:8092/eureka/,http://peer3.com:8093/eureka/
4.3 consumer配置

啟動類
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);
}
}
服務(wù)調(diào)用測試類
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.*;
/**
* 測試
*/
@RestController
public class TestController {
/**
* 使用服務(wù)名才能負(fù)載均衡,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<String> res = restTemplate.getForEntity(REST_URL_PREFIX + "/sayHello?name={1}", String.class, getName());
return res.getBody();
}
@GetMapping("/testPost")
public String testPost() {
MultiValueMap<String, Object> params = new LinkedMultiValueMap<String, Object>();
params.add("name", getName());
// HttpHeaders headers = new HttpHeaders();
// headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
HttpEntity< MultiValueMap<String, Object>> request = new HttpEntity<>(params, null);
ResponseEntity<String> res = restTemplate.postForEntity(REST_URL_PREFIX + "/sayHello", request, String.class);
return res.getBody();
}
private String getName() {
List<String> greetings = Arrays.asList("Bob", "Alice", "Jack");
Random rand = new Random();
int randomNum = rand.nextInt(greetings.size());
return greetings.get(randomNum);
}
}
RestTemplate負(fù)責(zé)均衡配置類
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 {
/**
* 構(gòu)建有負(fù)載均衡功能的RestTemplate實例對象
*
* @return RestTemplate實例對象
*/
@Bean
@LoadBalanced
RestTemplate restTemplate() {
return new RestTemplate();
}
}
yml配置
spring:
application:
#應(yīng)用名,也是Eureka的服務(wù)名
name: cosumer
server:
port: 8088
eureka:
client:
#注冊中心地址
serviceUrl:
#注冊中心獨立模式
#defaultZone: http://localhost:8090/eureka/
#注冊中心點對點模式
defaultZone: http://peer1.com:8091/eureka/,http://peer2.com:8092/eureka/,http://peer3.com:8093/eureka/
5.運行測試
5.1本機hosts配置
127.0.0.1 peer1.com
127.0.0.1 peer2.com
127.0.0.1 peer3.com
5.2 編輯運行配置

三個注冊中心節(jié)點運行配置



兩個服務(wù)提供者的運行配置


5.3 運行程序
(1) 啟動注冊中心
依次啟動RegisterCenter1->RegisterCenter2->RegisterCenter3,啟動成功后,可訪問http://localhost:8091/ 或http://localhost:8092/ 或http://localhost:8093/ 查看是否啟動成功

(2)啟動服務(wù)提供者provider
依次啟動Provider1->Provider2, 隨便訪問一個注冊中心地址首頁即可查看狀態(tài),如下圖

(3) 啟動消費者cosumer
(4) 在瀏覽器中進行測試
測試地址:http://localhost:8088/testPost / http://localhost:8088/testGet
(5) 在Provider1/Provider2的控制臺中可以看到輸出結(jié)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 微服務(wù)集群框架您已經(jīng)搭建成功!
附錄
github地址:https://github.com/hdwang123/springcloudtest
參考文章:
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
到此這篇關(guān)于SpringCloud搭建netflix-eureka微服務(wù)集群的過程詳解的文章就介紹到這了,更多相關(guān)SpringCloud搭建netflix-eureka集群內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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