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1、provider
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2、?手寫LoadBalancer
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3、實例
? ? ? ? ? ? ? ?1)、provider2004
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? ? ? ?2)、consumer2018? ??手寫LoadBalancer? ?
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? ? ? ? ?i)、pom.xml
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<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
? ? ???ii)、application.properties
? ? ? #?應用名稱
spring.application.name=consumer2018
#?應用服務?WEB?訪問端口
server.port=2018
#?Nacos幫助文檔:?https://nacos.io/zh-cn/docs/concepts.html
#?Nacos認證信息
spring.cloud.nacos.discovery.username=nacos
spring.cloud.nacos.discovery.password=nacos
#?Nacos?服務發現與注冊配置，其中子屬性?server-addr?指定?Nacos?服務器主機和端口
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
#?注冊到?nacos?的指定?namespace，默認為?public
spring.cloud.nacos.discovery.namespace=public
? ? ? ?iii)、LoadBalancer?
public interface LoadBalancer {
ServiceInstance getSingleAddres(List<ServiceInstance> serviceInstances);
}
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? ? ? ?iiii)、RotationLoadBalancer?
@Component
public class RotationLoadBalancer implements LoadBalancer{
private AtomicInteger atomicInteger=new AtomicInteger(0);
@Override
public ServiceInstance getSingleAddres(List<ServiceInstance> serviceInstances) {
int index=atomicInteger.incrementAndGet()%serviceInstances.size();
return serviceInstances.get(index);
}
}
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? ? ? ? iiiii)、Consumer2018Application?
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@SpringBootApplication
public class Consumer2018Application {
public static void main(String[] args) {
SpringApplication.run(Consumer2018Application.class, args);
}
@Bean
public RestTemplate restTemplate(){
return new RestTemplate();
}
}
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? ? ???iiiiii)、OrderService
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@RestController
public class OrderService {
@Autowired
private DiscoveryClient discoveryClient;
@Autowired
private RestTemplate restTemplate;
@Autowired
private LoadBalancer loadBalancer;
@RequestMapping("/orderToMember")
public String orderToMember(){
List<ServiceInstance> instances=discoveryClient.getInstances("provider2004");
ServiceInstance serviceInstance=instances.get(0);
String rpcMemberUrl2=serviceInstance.getUri().toString();
String result2=restTemplate.getForObject(rpcMemberUrl2+"/hello/123131321312",String.class);
String rpcMemberUrl=loadBalancer.getSingleAddres(instances).getUri().toString();
String result=restTemplate.getForObject(rpcMemberUrl+"/hello/123131321312",String.class);
return "調用provider2004 返回結果:"+result;
}
}
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本文摘自 ：https://blog.51cto.com/s
