SpringCloud搭建Eureka集群(三)

第三部分：Eureka Client添加ribbon负载均衡应用---消费者服务

Step1：新建工程，引入依赖

注意，这里我们要引入新的依赖ribbon。

Eureka消费者的pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.cloud</groupId> <artifactId>consumer-srv</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>consumer-srv</name> <description>consumer-srv</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Finchley.SR2</spring-cloud.version> </properties> <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> <!--增加ribbon的依赖--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-ribbon</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 修改后立即生效, 热部署 --> <dependency> <groupId>org.springframework</groupId> <artifactId>springloaded</artifactId> <version>1.2.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</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> <configuration> <!-- 没有该配置，devtools 不生效 --> <fork>true</fork> <addResources>true</addResources> </configuration> </plugin> <!-- spring Boot在编译的时候，是有默认JDK版本的，这里自定义指定JDK版本 --> <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jar-plugin</artifactId> <configuration> <archive> <manifest> <addClasspath>true</addClasspath> <classpathPrefix>lib/</classpathPrefix> <mainClass>com.yame.Application</mainClass> <useUniqueVersions>false</useUniqueVersions> </manifest> <manifestEntries> <Class-Path>./</Class-Path> </manifestEntries> </archive> </configuration> </plugin> </plugins> </build> <!--远程仓库--> <repositories> <repository> <id>spring-snapshots</id> <name>Spring Snapshots</name> <url>https://repo.spring.io/snapshot</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>

Step2：配置消费者(跟生产者类似)

#用于开发环境 spring: application: name: consumer #ServiceId server: port: 8090 eureka: client: service-url: defaultZone: http://peer1:8000/eureka/,http://peer2:8001/eureka/,http://peer3:8002/eureka/

Step3：启用发现服务并开启客户端负载均衡

package com.cloud; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; 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; @EnableEurekaClient @SpringBootApplication public class MicroConsumerSrvApp { public static void main(String[] args) { SpringApplication.run(MicroConsumerSrvApp.class, args); } @Bean @LoadBalanced // 让restTemplate具备Ribbon负载均衡的能力。 RestTemplate restTemplate() { return new RestTemplate(); } }

Step4：编写消费者实例

package com.cloud.hello; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate; /** * @author Administrator 2018/10/29 */ @RestController @RequestMapping(value = "consumer") public class ConsumerController { @Autowired RestTemplate restTemplate; @RequestMapping("hello") public String hello() { // producer1: 使用的是服务提供者的ServiceId,也就是application.name return restTemplate.getForEntity("http://producer1/hello", String.class).getBody(); } }

Step5：验证Eureka注册中心

 Step6：验证请求

参考文档：

  《SpringCloud 微服务实践》

源码：https://github.com/iprometheus/spring-cloud-eureka-test