springcloud+nacos服务之间调用的几种方式

1. springcloud内置的负载均衡客户端获取服务ip和端口

    @Autowiredprivate LoadBalancerClient loadBalancerClient;//通过服务名获取到服务的ip和端口，随后通过restTemplate或者okhttp等请求public void test() {ServiceInstance choose = loadBalancerClient.choose("jzhy-order");String url = "http://" + choose.getServiceId() + ":" + choose.getPort();System.out.println(url);System.out.println(choose.getHost());System.out.println(choose.getUri());}

2. nacos通过服务名称获取服务ip和端口

	//获取nacos管理，由于nacos的bug，只能注入一下两个类来实现@Autowiredprivate NacosServiceManager nacosServiceManager;@Autowiredprivate NacosDiscoveryProperties nacosDiscoveryProperties;public void test(){String url = "";try {NamingService namingService = nacosServiceManager.getNamingService(nacosDiscoveryProperties.getNacosProperties());Instance instance = namingService.selectOneHealthyInstance(ServiceNameConstants.JZHY_FILE_SERVICE);url = StrUtil.format("http://{}:{}/upload", instance.getIp(), instance.getPort());} catch (NacosException e) {e.printStackTrace();throw new CustomException("从注册中心获取文件服务异常", e);}}//同样根据服务名称获取到服务ip和端口，直接发起http请求

3. FeignClient 远程调用

// 先写个客户端@FeignClient(contextId = "remoteOrderService", value = ServiceNameConstants.JZHY_ORDER, fallbackFactory = RemoteOrderFallbackFactory.class)
public interface RemoteOrderService
{@GetMapping("/test")public String getUserInfo();
}// 再来个Factory
@Component
public class RemoteOrderFallbackFactory implements FallbackFactory<RemoteOrderService>
{private static final Logger log = LoggerFactory.getLogger(RemoteOrderFallbackFactory.class);@Overridepublic RemoteOrderService create(Throwable throwable){log.error("order服务调用失败:{}", throwable.getMessage());return new RemoteOrderService(){@Overridepublic String getUserInfo() {return "获取失败:" + throwable.getMessage();}};}
}// 继续在 META-INF/spring.factories 文件中声明Factory

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