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NacosDiscoveryClient的使用方法

发表于：2025-02-03 作者：千家信息网编辑

千家信息网最后更新 2025年02月03日，本篇内容主要讲解"NacosDiscoveryClient的使用方法"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"NacosDiscoveryClient

千家信息网最后更新 2025年02月03日NacosDiscoveryClient的使用方法

本篇内容主要讲解"NacosDiscoveryClient的使用方法"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"NacosDiscoveryClient的使用方法"吧!

序

本文主要研究一下NacosDiscoveryClient

NacosDiscoveryClient

spring-cloud-alibaba-0.9.0.RELEASE/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosDiscoveryClient.java

public class NacosDiscoveryClient implements DiscoveryClient {        private static final Logger log = LoggerFactory.getLogger(NacosDiscoveryClient.class);        public static final String DESCRIPTION = "Spring Cloud Nacos Discovery Client";        private NacosDiscoveryProperties discoveryProperties;        public NacosDiscoveryClient(NacosDiscoveryProperties discoveryProperties) {                this.discoveryProperties = discoveryProperties;        }        @Override        public String description() {                return DESCRIPTION;        }        @Override        public List getInstances(String serviceId) {                try {                        List instances = discoveryProperties.namingServiceInstance()                                        .selectInstances(serviceId, true);                        return hostToServiceInstanceList(instances, serviceId);                }                catch (Exception e) {                        throw new RuntimeException(                                        "Can not get hosts from nacos server. serviceId: " + serviceId, e);                }        }        private static ServiceInstance hostToServiceInstance(Instance instance,                        String serviceId) {                NacosServiceInstance nacosServiceInstance = new NacosServiceInstance();                nacosServiceInstance.setHost(instance.getIp());                nacosServiceInstance.setPort(instance.getPort());                nacosServiceInstance.setServiceId(serviceId);                Map metadata = new HashMap<>();                metadata.put("nacos.instanceId", instance.getInstanceId());                metadata.put("nacos.weight", instance.getWeight() + "");                metadata.put("nacos.healthy", instance.isHealthy() + "");                metadata.put("nacos.cluster", instance.getClusterName() + "");                metadata.putAll(instance.getMetadata());                nacosServiceInstance.setMetadata(metadata);                if (metadata.containsKey("secure")) {                        boolean secure = Boolean.parseBoolean(metadata.get("secure"));                        nacosServiceInstance.setSecure(secure);                }                return nacosServiceInstance;        }        private static List hostToServiceInstanceList(                        List instances, String serviceId) {                List result = new ArrayList<>(instances.size());                for (Instance instance : instances) {                        result.add(hostToServiceInstance(instance, serviceId));                }                return result;        }        @Override        public List getServices() {                try {                        ListView services = discoveryProperties.namingServiceInstance()                                        .getServicesOfServer(1, Integer.MAX_VALUE);                        return services.getData();                }                catch (Exception e) {                        log.error("get service name from nacos server fail,", e);                        return Collections.emptyList();                }        }}

NacosDiscoveryClient实现了org.springframework.cloud.client.discovery.DiscoveryClient接口；其getInstances方法从discoveryProperties获取NamingService，然后通过NamingService.selectInstances获取实例信息，然后转换为org.springframework.cloud.client.ServiceInstance类型；getServices方法通过NamingService.getServicesOfServer获取services信息

NacosDiscoveryClientAutoConfiguration

spring-cloud-alibaba-0.9.0.RELEASE/spring-cloud-alibaba-nacos-discovery/src/main/java/org/springframework/cloud/alibaba/nacos/discovery/NacosDiscoveryClientAutoConfiguration.java

@Configuration@ConditionalOnNacosDiscoveryEnabled@AutoConfigureBefore({ SimpleDiscoveryClientAutoConfiguration.class,                CommonsClientAutoConfiguration.class })public class NacosDiscoveryClientAutoConfiguration {        @Bean        @ConditionalOnMissingBean        public NacosDiscoveryProperties nacosProperties() {                return new NacosDiscoveryProperties();        }        @Bean        public DiscoveryClient nacosDiscoveryClient(                        NacosDiscoveryProperties discoveryProperties) {                return new NacosDiscoveryClient(discoveryProperties);        }        @Bean        @ConditionalOnMissingBean        @ConditionalOnProperty(value = "spring.cloud.nacos.discovery.watch.enabled", matchIfMissing = true)        public NacosWatch nacosWatch(NacosDiscoveryProperties nacosDiscoveryProperties) {                return new NacosWatch(nacosDiscoveryProperties);        }}

NacosDiscoveryClientAutoConfiguration注册了NacosDiscoveryClient

小结

NacosDiscoveryClient实现了org.springframework.cloud.client.discovery.DiscoveryClient接口；其getInstances方法从discoveryProperties获取NamingService，然后通过NamingService.selectInstances获取实例信息，然后转换为org.springframework.cloud.client.ServiceInstance类型；getServices方法通过NamingService.getServicesOfServer获取services信息

到此，相信大家对"NacosDiscoveryClient的使用方法"有了更深的了解，不妨来实际操作一番吧！这里是网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！

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