SpringCloud Ribbon 负载均衡的实现

 <!-- Ribbon -->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
    </dependency>

@EnableEurekaClient
@RibbonClient(name = "RibbonConfig", configuration = RibbonConfig.class)
@SpringBootApplication
public class SpringbootSpringdataJpaApplication{

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

@Configuration
class RibbonConfig {

  @Bean
  public IRule ribbonRule(){
    return new RandomRule(); //分配策略：随机选择一个server
//    return new BestAvailableRule(); //分配策略：选择一个最小的并发请求的server，逐个考察Server，如果Server被tripped了，则忽略
//    return new RoundRobinRule(); //分配策略：轮询选择，轮询index，选择index对应位置的server
//    return new WeightedResponseTimeRule(); //分配策略：根据响应时间分配一个weight(权重)，响应时间越长，weight越小，被选中的可能性越低
//    return new ZoneAvoidanceRule(); //分配策略：复合判断server所在区域的性能和server的可用性选择server
//    return new RetryRule(); //分配策略：对选定的负载均衡策略机上重试机制，在一个配置时间段内当选择server不成功，则一直尝试使用subRule的方式选择一个可用的server
  }

  @Bean
  public IPing ribbonPing() {
    return new PingUrl();
  }

  @Bean
  public ServerListSubsetFilter serverListFilter() {
    ServerListSubsetFilter filter = new ServerListSubsetFilter();
    return filter;
  }

}

@RestController
@RequestMapping("/user")
public class UserController {

  @RequestMapping("/ribbon")
  public String ribbon() {
    return "springdatejpa -- 我的端口是：10088";
  }

}

@FeignClient(name = "springdatejpa", path = "/user/")
public interface MyspringbootFeign {

  @RequestMapping("/ribbon")
  String ribbon();
}

/**
   * feign调用
   */
  @GetMapping("feign/ribbon")
  String ribbon(){
    return myspringbootFeign.ribbon();
  }