SpringCloud搭建Eureka集群(三)

版权声明：lpf https://blog.csdn.net/justlpf/article/details/83382885

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