SpringCloud如何根據(jù)服務(wù)名獲取服務(wù)運(yùn)行實(shí)例并進(jìn)行負(fù)載均衡
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(shí)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(shí)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(shí)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(shí)時拉取服務(wù)列表。
- 負(fù)載均衡實(shí)現(xiàn)
微服務(wù)在自動進(jìn)行服務(wù)發(fā)現(xiàn)后,進(jìn)行的是客戶端負(fù)載均衡,也就是客戶端自己維護(hù)了一套負(fù)載均衡算法,每次請求選擇某一臺服務(wù)器進(jìn)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(jìn)行服務(wù)的負(fù)載均衡。
到此這篇關(guān)于SpringCloud根據(jù)服務(wù)名獲取服務(wù)運(yùn)行實(shí)例并進(jìn)行負(fù)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(yùn)行實(shí)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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