SpringCloudAlibaba之Nacos實現服務註冊與發現

上一篇：SpringCloudAlibaba之Nacos環境搭建

Maven依賴信息

<parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
     <version>2.0.0.RELEASE</version>
 </parent>
<dependencies>
    <!--  springboot 整合web組件-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        <version>0.2.2.RELEASE</version>
    </dependency>
</dependencies>

 

 

 

會員服務(生產者)

@RestController
public class MemberService {
    @Value("${server.port}")
    private String serverPort;

    /**
     * 會員服務提供的接口
     *
     * @param userId
     * @return
     */
    @RequestMapping("/getUser")
    public String getUser(Integer userId) {
        return "每特教育,端口號:" + serverPort;
    }
}

 

 

配置文件

application.yml文件

spring:
  cloud:
    nacos:
      discovery:
        ###服務註冊地址
        server-addr: 127.0.0.1:8848
  application:
    name: mayikt-member
server:
  port: 8081

 

訂單服務(消費者)

@RestController
public class OrderService {

    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private DiscoveryClient discoveryClient;
    @Autowired
    private LoadBalancer loadBalancer;

  
    @RequestMapping("/orderToMember")
    public String orderToMember() {
        // 從註冊中心上獲取該註冊服務列表
        List<ServiceInstance> serviceInstanceList = discoveryClient.getInstances("mayikt-member");
        ServiceInstance serviceInstance = loadBalancer.getSingleAddres(serviceInstanceList);
        URI rpcMemberUrl = serviceInstance.getUri();
        // 使用本地rest形式實現rpc調用
        String result = restTemplate.getForObject(rpcMemberUrl + "/getUser", String.class);
        return "訂單調用會員獲取結果:" + result;
    }
}

 

application.yml文件

spring:
  cloud:
    nacos:
      discovery:
        ###服務註冊地址
        server-addr: 127.0.0.1:8848
  application:
    name: mayikt-order
server:
  port: 8082

 

負載均衡算法

public interface LoadBalancer {


    /**
     * 根據多個不同的地址 返回單個調用rpc地址
     *
     * @param serviceInstances
     * @return
     */
    ServiceInstance getSingleAddres(List<ServiceInstance> serviceInstances);
}

 

@Component
public class RotationLoadBalancer implements LoadBalancer {
    private AtomicInteger atomicInteger = new AtomicInteger(0);

    @Override
    public ServiceInstance getSingleAddres(List<ServiceInstance> serviceInstances) {
        int index = atomicInteger.incrementAndGet() % 2;
        ServiceInstance serviceInstance = serviceInstances.get(index);
        return serviceInstance;
    }
}

 

 

以上內容學習來源於每特教育螞蟻課堂 http://www.mayikt.com/front/couinfo/247/0#
 

史上最全的SpringCloudAlibaba課程

https://pan.baidu.com/s/1OHX3B2Q97gn1K6wfZsURLw
密碼：00yk