springboot + springCloud搭建简单集群

绝地灬酷狼 2023-02-16 06:44 61阅读 0赞

源码：  
[https://github.com/LM917178900/spring-boot-hello][https_github.com_LM917178900_spring-boot-hello]  
[https://github.com/LM917178900/eureka-server][https_github.com_LM917178900_eureka-server]  
[https://github.com/LM917178900/ribbon-consumer][https_github.com_LM917178900_ribbon-consumer]

### 1 搭建client集群 ###

#### 1.1新建springboot微服务，spring-boot-hello ####

#### 1.2 pom ####

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka-server</artifactId>
            </dependency>
        </dependencies>
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Brixton.SR5</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>

#### 1.3 aplication.properties ####

client即是服务端也是消费端，将client注册到两台注册中心。

spring.application.name=hello-service
    # 注册到两台注册中心
    eureka.client.service-url.defaultZone=http://peer1:1111/eureka/,http://peer2:1112/eureka

#### 1.4 启动类 ####

package com.didispace.springboothello;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    /** * 能够被发现为客户端 */
    @EnableDiscoveryClient
    @SpringBootApplication
    public class SpringBootHelloApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringBootHelloApplication.class, args);
        }
    
    }

#### 1.5 controller ####

package com.didispace.springboothello.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cloud.client.ServiceInstance;
    import org.springframework.cloud.client.discovery.DiscoveryClient;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.logging.Logger;
    
    /** * @Author: leimin * @Description: new class * @Date: 2020/6/8 9:08 * @Version: 1.0 */
    @RestController
    public class HelloController { 
    
        /** * xx */
        private final Logger logger = Logger.getLogger(String.valueOf(getClass()));
    
        /** * xx */
        @Autowired
        private DiscoveryClient client;
    
        /** * xx * @return xx */
        @RequestMapping(value = "/hello",method = RequestMethod.GET)
        public String index(){ 
    
            ServiceInstance instance = client.getLocalServiceInstance();
            logger.info("/hello,host:" + instance.getHost()+", service_id:" +instance.getServiceId());
    
            return "hello World !";
        }
    }

#### 1.6 启动 ####

不同shell窗口，同时启动两个实例

java -jar ./spring-boot-hello-0.0.1.SANPSHOT.jar --server.port=8081
    java -jar ./spring-boot-hello-0.0.1.SANPSHOT.jar --server.port=8082

### 2 搭建eureka集群 ###

#### 2.1 新建springboot微服务，eureka-server ####

#### 2.2 pom ####

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka-server</artifactId>
            </dependency>
        </dependencies>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Brixton.SR5</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>

#### 2.3 application.properties ####

配置两个application，相互注册检索，实现注册同步和高可用，分别是：  
application-peer1.properties

# 自己是注册中心，当成客户端
    eureka.client.register-with-eureka=true
    # 需要去检索服务
    eureka.client.fetch-registry=true
    
    spring.application.name=eureka-server
    server.port=1111
    
    eureka.instance.hostname=peer1
    eureka.client.service-url.defaultZone=http://peer2:1112/eureka/

application-peer2.properties

# 自己是注册中心，被当成客户端
    eureka.client.register-with-eureka=true
    # 需要去检索服务
    eureka.client.fetch-registry=true
    
    spring.application.name=eureka-server
    server.port=1112
    
    eureka.instance.hostname=peer2
    eureka.client.service-url.defaultZone=http://peer1:1111/eureka/

#### 2.4 启动类 ####

package com.huahua.demo;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    /** * 能够被发现为服务端 */
    @EnableEurekaServer
    @SpringBootApplication
    public class EurekaServerApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(EurekaServerApplication.class, args);
        }
    }

#### 2.5 启动 ####

在不同shell窗口，同时启动两个注册中心。

java -jar ./demo-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer1
    java -jar ./demo-0.0.1-SNAPSHOT.jar --spring.profiles.active=peer2

### 3 ribbon实现消费者负载均衡 ###

#### 3.1 新建springboot微服务，ribbon-consumer ####

#### 3.2 pom ####

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-ribbon</artifactId>
            </dependency>
        </dependencies>
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Brixton.SR5</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>

#### 3.3 application ####

spring.application.name=ribbon-consumer
    server.port=9000
    
    # 配置一个就行了，负载均衡
    eureka.client.service-url.defaultZone=http://localhost:1111/eureka/

#### 3.4 启动类 ####

package com.example.lei;
    
    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.context.annotation.Bean;
    import org.springframework.web.client.RestTemplate;
    
    @EnableDiscoveryClient
    @SpringBootApplication
    public class RibbonConsumerApplication { 
    
        @Bean
        @LoadBalanced
        RestTemplate restTemplate(){ 
            return new RestTemplate();
        }
        public static void main(String[] args) { 
            SpringApplication.run(RibbonConsumerApplication.class, args);
        }
    
    }

#### 3.5 controller ####

package com.example.lei.controller;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    /** * @Author: leimin * @Description: new class * @Date: 2020/6/8 16:04 * @Version: 1.0 */
    @RestController
    public class ConsumerController { 
    
        /** * xx */
        @Autowired
        RestTemplate restTemplate;
    
        /** * yyy * @return rr */
        @RequestMapping(value = "/ribbon-consumer", method = RequestMethod.GET)
        private String helloConsumer(){ 
    
            return restTemplate.getForEntity("http://HELLO-SERVICE/hello",String.class).getBody();
        }
    }

#### 3.6 直接启功 ####

然后就开始使用，通过consumer调用spring-boot-hello中的接口。

[https_github.com_LM917178900_spring-boot-hello]: https://github.com/LM917178900/spring-boot-hello
[https_github.com_LM917178900_eureka-server]: https://github.com/LM917178900/eureka-server
[https_github.com_LM917178900_ribbon-consumer]: https://github.com/LM917178900/ribbon-consumer