Dubbo implements service registration and discovery

Maven coordinates of dependent class libraries: <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo</artifactId> <version>2.7.8</version> </dependency> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-dependencies-zookeeper</artifactId> <version>2.7.8</version> </dependency> Brief introduction: -Dubbo: Apache Dubbo is a high-performance Java RPC framework used to build distributed services and applications. -ZooKeeper: Apache ZooKeeper is a highly available distributed coordination service commonly used for service registration and discovery. Sample Dubbo Service Registration and Discovery (Provider and Consumer): Firstly, we need to create a service provider and a service consumer, and then register and discover services through ZooKeeper. 1. Create a service provider: import org.apache.dubbo.config.ApplicationConfig; import org.apache.dubbo.config.RegistryConfig; import org.apache.dubbo.config.ServiceConfig; public class Provider { public static void main(String[] args) throws Exception { //1 Create an application configuration ApplicationConfig applicationConfig = new ApplicationConfig(); applicationConfig.setName("demo-provider"); //2 Create a registry configuration RegistryConfig registryConfig = new RegistryConfig(); registryConfig.setAddress("zookeeper://127.0.0.1:2181"); //3 Create a service configuration ServiceConfig<GreetingService> serviceConfig = new ServiceConfig<>(); serviceConfig.setApplication(applicationConfig); serviceConfig.setRegistry(registryConfig); serviceConfig.setInterface(GreetingService.class); serviceConfig.setRef(new GreetingServiceImpl()); //4 Exposure Services serviceConfig.export(); //5 Block main thread System.in.read(); } } 2. Create a Service Consumer: import org.apache.dubbo.config.ApplicationConfig; import org.apache.dubbo.config.ReferenceConfig; import org.apache.dubbo.config.RegistryConfig; import org.apache.dubbo.demo.GreetingService; public class Consumer { public static void main(String[] args) { //1 Create an application configuration ApplicationConfig applicationConfig = new ApplicationConfig(); applicationConfig.setName("demo-consumer"); //2 Create a registry configuration RegistryConfig registryConfig = new RegistryConfig(); registryConfig.setAddress("zookeeper://127.0.0.1:2181"); //3 Create a service reference configuration ReferenceConfig<GreetingService> referenceConfig = new ReferenceConfig<>(); referenceConfig.setApplication(applicationConfig); referenceConfig.setRegistry(registryConfig); referenceConfig.setInterface(GreetingService.class); //4 Reference Service GreetingService greetingService = referenceConfig.get(); //5 Calling service methods String message = greetingService.sayHello("Dubbo"); System.out.println("Message: " + message); } } 3. Define service interfaces and implementation classes: public interface GreetingService { String sayHello(String name); } public class GreetingServiceImpl implements GreetingService { public String sayHello(String name) { return "Hello, " + name + "!"; } } 4. Start the ZooKeeper server on ZooKeeper and use the default configuration. 5. Run the service provider and service consumer, and you can see that the service consumer successfully called the service provider and received the correct response. Summary: Dubbo is a powerful distributed RPC framework that allows for easy dynamic discovery and invocation of services through its service registration and discovery capabilities. Using ZooKeeper as the registration center can achieve high availability and load balancing of services. In practical applications, it is only necessary to introduce the dependencies of Dubbo and ZooKeeper, configure corresponding service providers and consumers, and achieve service registration and discovery. The above is a simple example that demonstrates how to implement service registration and discovery in Dubbo.