Ribbon快速开始

1、引入必要的maven依赖：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath />
</parent>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Edgware.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
    <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>

2、创建springboot的启动类：

@SpringBootApplication
@EnableDiscoveryClient
public class HelloApplicaton {

    //这里就是创建一个负载均衡的RestTemplate Bean
    @LoadBalanced
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }


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

3、resource下配置启动文件：application.yml或者application.properties

server:
  port: 9091
spring:
  application:
    name: post-service
eureka:
  instance:
    hostname: localhost
  client:
    serviceUrl:
        defaultZone: http://localhost:1111/eureka/

4、创建消费者请求接口:

@RestController
public class HelloController {

   //注入前面创建的负载均衡的RestTemplate
    @Autowired
    public RestTemplate restTemplate;

    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    public String postHello(){
     //使用有负载均衡能力的RestTemplate请求微服务
     return   restTemplate.getForEntity("http://HELLO-SERVICE/hello"
                ,String.class,"").getBody();
    }
}

注：这里的HELLO-SERVICE就是注册中心存在的微服务的名称，这个大家应该都很清楚；

这样一个具有负载均衡能力的消费者接口就创建成功了！