Spring Cloud Ribbon实现客户端负载均衡的示例

<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>
</dependencies>

spring.application.name=consumer
server.port=30001
eureka.client.service-url.defaultZone=http://localhost:10001/eureka/,http://localhost:10002/eureka/

@Controller
@RequestMapping("user")
public class UserController {
 
 @Bean
 @LoadBalanced
 RestTemplate initRestTemplate(){
  return new RestTemplate();
 }
 
 @Autowired
 private RestTemplate restTemplate;
 
 @RequestMapping("add")
 @ResponseBody
 public String add(String userName, String age){
  return restTemplate.getForEntity("http://PRODUCER/user/add",String.class,userName,age).getBody();
 }
}

@EnableEurekaClient
@SpringBootApplication
public class ConsumerApplication {
 public static void main(String[] args) {
  SpringApplication.run(ConsumerApplication.class,args);
 }
}

spring.application.name=producer
server.port=20001
eureka.client.service-url.defaultZone=http://localhost:10001/eureka/,http://localhost:10002/eureka/

spring.application.name=producer
server.port=20002
eureka.client.service-url.defaultZone=http://localhost:10001/eureka/,http://localhost:10002/eureka/

@Controller
@RequestMapping("user")
public class UserController {
 private Logger logger = LoggerFactory.getLogger(getClass());
 
 @Autowired
 private DiscoveryClient client;
 @RequestMapping("add")
 @ResponseBody
 public String addUser(String userName, String age) {
  return "Success from " + client.getLocalServiceInstance().getHost() + ":" + client.getLocalServiceInstance().getPort() ;
 }
}