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SpringCloud如何根據(jù)服務(wù)名獲取服務(wù)運行實例并進行負載均衡

更新時間：2025年01月20日 17:28:08 作者：DanceDonkey

文章介紹了SpringCloud中使用Nacos作為注冊中心時,服務(wù)注冊和發(fā)現(xiàn)的過程,以及如何通過DiscoveryClient接口和LoadBalancerClient類進行服務(wù)的負載均衡,感興趣的朋友跟隨小編一起看看吧

Nacos注冊中心

每個服務(wù)啟動之后都要向注冊中心發(fā)送服務(wù)注冊請求，注冊中心可以和各個注冊客戶端自定義協(xié)議實現(xiàn)服務(wù)注冊和發(fā)現(xiàn)。

pom.xml

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

啟動服務(wù)

獲取服務(wù)實例測試

@EnableDiscoveryClient
@SpringBootApplication
public class Main83
{
    public static void main(String[] args)
    {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(Main83.class, args);
        DiscoveryClient discoveryClient = applicationContext.getBean(DiscoveryClient.class);
        List<ServiceInstance> instances = discoveryClient.getInstances("nacos-payment-provider");
        for (ServiceInstance instance : instances) {
            System.out.println("instance.getHost() = " + instance.getHost());
            System.out.println("instance.getPort() = " + instance.getPort());
        }
        NacosDiscoveryClient nacosDiscoveryClient = applicationContext.getBean(NacosDiscoveryClient.class);
        List<ServiceInstance> serviceInstances = nacosDiscoveryClient.getInstances("nacos-payment-provider");
        for (ServiceInstance instance : serviceInstances) {
            System.out.println("Nacos instance.getHost() = " + instance.getHost());
            System.out.println("instance.getPort() = " + instance.getPort());
        }
        LoadBalancerClient balancerClient = applicationContext.getBean(LoadBalancerClient.class);
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
    }
}

在引入注冊中心相關(guān)的依賴后，注冊中心的相關(guān)API會實現(xiàn)SpringCloud規(guī)范，自動給容器中存入DiscoveryClient對象，引入了Nacos，就是NacosDiscoveryClient。通過DiscoveryClient接口提供的能力可以從注冊中心實時拉取服務(wù)列表。

負載均衡實現(xiàn)

微服務(wù)在自動進行服務(wù)發(fā)現(xiàn)后，進行的是客戶端負載均衡，也就是客戶端自己維護了一套負載均衡算法，每次請求選擇某一臺服務(wù)器進行請求。

pom.xml

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>

LoadBalancerClient balancerClient = applicationContext.getBean(LoadBalancerClient.class);
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());
        System.out.println("balancerClient.choose(\"nacos-payment-provider\").getPort() = " + balancerClient.choose("nacos-payment-provider").getPort());

LoadBalancerClient類會自動使用容器中的DiscoveryClient進行服務(wù)的負載均衡。

到此這篇關(guān)于SpringCloud根據(jù)服務(wù)名獲取服務(wù)運行實例并進行負載均衡的文章就介紹到這了,更多相關(guān)SpringCloud服務(wù)名獲取服務(wù)運行實例內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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