In-depth discusses the simple RMI framework technology in the Java library (Translation: In-Depth Explration of the Technical Principles of 'Simple RMI' Framework in Java Class Libraries)
In -depth discussion on the simple RMI framework technology in the Java library
Introduction:
Remote method call (RMI) is a technology that communicates between different nodes in distributed systems.Java's RMI framework provides a simple and powerful way to achieve distributed applications.One of the widely used RMI frameworks is a simple RMI framework.This article will explore the simple RMI framework technology in the Java class library and explain its working principle by providing the Java code example.
The working principle of RMI:
In the RMI framework, the client and server are interacting through communication on the network.The RMI framework uses the Java serialization and the deepertdization mechanism to support data transmission between remote objects.The following is the working principle of the simple RMI framework:
1. The client initiates the remote method call by obtaining a reference to a remote object on the server.
2. The client sends the method call request to the server through the network.
3. After the server receives the request, the parameters of the request are serialized through the Java dependency serialization mechanism.
4. The server calls the method of being requested and serialize the result and send it to the client.
5. After the client receives the results, the result is serialized through the Java dependent sequence mechanism.
The implementation of the simple RMI framework:
The following is an example of a simple RMI framework:
1. Create remote interface remoteInterface.java:
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface RemoteInterface extends Remote {
public String sayHello(String name) throws RemoteException;
}
2. Create the server to implement the serverImplementation.java:
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class ServerImplementation extends UnicastRemoteObject implements RemoteInterface {
public ServerImplementation() throws RemoteException {}
public String sayHello(String name) throws RemoteException {
return "Hello, " + name + "!";
}
public static void main(String[] args) {
try {
ServerImplementation serverObj = new ServerImplementation();
System.setProperty("java.rmi.server.hostname", "localhost");
Naming.rebind("//localhost/RemoteObject", serverObj);
System.out.println("Server running...");
} catch (Exception e) {
e.printStackTrace();
}
}
}
3. Create a client to implement clientimplementation.java:
import java.rmi.Naming;
import java.rmi.RemoteException;
public class ClientImplementation {
public static void main(String[] args) {
try {
RemoteInterface remoteObj = (RemoteInterface) Naming.lookup("//localhost/RemoteObject");
System.out.println(remoteObj.sayHello("John"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
4. Compilation and operation:
Compile and run ServerIMPLEMENTATION.JAVA and Clientimplementation.java.
When the client is running, it will be connected to a local server and calls the remote method Sayhello.The server will return a string containing a greeting message, and the client will print the message.
Summarize:
The simple RMI framework provides a convenient way to call for remote methods through the network client and server of the distributed system through the network.Through the support of the Java serialization and the deepening serialization mechanism, the simple RMI framework implements data transmission and communication.This article discusses the technical principles of the simple RMI framework in the Java class library and provides the corresponding Java code example.It is hoped that through this article, readers can have a deeper understanding of the simple RMI framework and can apply the framework in their own distributed applications.
