Eureka微服务实战-客户端ribbon负载均衡

1.核心主启动类 ConsumerDiscoveryApplication.java

@SpringBootApplication
@EnableDiscoveryClient //发现注册中心的客户端
public class ConsumerDiscoveryApplication {

    @Bean
    @LoadBalanced //负载均衡
    RestTemplate restTemplate(){
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(ConsumerDiscoveryApplication.class, args);
    }
}

2.rest控制器 ConsumerController.java

@RestController
public class ConsumerController {

    private final Logger log = LoggerFactory.getLogger(ConsumerController.class);


    @Autowired
    private RestTemplate restTemplate;//eureka服务发现接口

    @RequestMapping(value = "/ribbon-consumer",method = RequestMethod.GET)
    public String index(){
        //获取负载均衡注解的实例，进行分发
        return restTemplate.getForEntity("http://hello-server/hello",String.class).getBody();
    }

}

3.application配置文件

spring:
    application:
        name: ribbon-consumer

server:
    port: 7001
eureka:
    instance:
        lease-expiration-duration-in-seconds: 30
        lease-renewal-interval-in-seconds: 10
        hostname: localhost
    client:
        service-url:
            defaultZone: http://peer1:8761/eureka/
        enabled: true
        register-with-eureka: true

4.依赖pom.xml 文件

<?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.hnair</groupId>
    <artifactId>discovery</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>discovery</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.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.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <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-server</artifactId>
        </dependency>

        <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>
    </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>
            </plugin>
        </plugins>
    </build>


</project>

说明：通过启动上一篇博客多个服务提供者在不同的端口，请求ribbon-consumer地址，可以实现服务的负载均衡。