另外创建一个服务用来远程调用多个服务，对调用的服务进行负载均衡 （1）pom.xml
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.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> </properties> <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> <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> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Dalston.RC1</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> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories>（2）application.yml
eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/ server: port: 8764 spring: application: name: greeting-service（3）Application
// @EnableDiscoveryClient，向eureka注册自己作为一个服务的调用client // 之前的服务，EnableEurekaClient，代表的是向eureka注册自己，将自己作为一个服务 @SpringBootApplication @EnableDiscoveryClient public class GreetingServiceApplication { public static void main(String[] args) { SpringApplication.run(GreetingServiceApplication.class, args); } // 在spring容器中注入一个bean，RestTemplate，作为rest服务接口调用的客户端 // @LoadBalanced标注，代表对服务多个实例调用时开启负载均衡 @Bean @LoadBalanced public RestTemplate restTemplate() { return new RestTemplate(); } }（4）调用say-hello-service
// 写一个服务，注入RestTemplate服务调用客户端 @Service public class GreetingService { @Autowired private RestTemplate restTemplate; // 用SAY-HELLO-SERVICE这个服务名替代实际的ip地址 // ribbon负载在多个服务实例之间负载均衡，每次调用随机挑选一个实例，然后替换服务名 public String greeting(String name) { return restTemplate.getForObject("http://SAY-HELLO-SERVICE/sayHello?name="+name, String.class); } }（5）controller
@RestController public class GreetingControler { @Autowired private GreetingService greetingService; @RequestMapping(value = "/greeting") public String greeting(@RequestParam String name){ return greetingService.greeting(name); } }（6）多次访问http://localhost:8764/greeting?name=leo，发现每次访问的端口都不一样，在多个服务实例之间负载均衡了
