Simple Login Application in Java RMI

We are attaching Simple program about, How to write Simple Login Application in Java RMI. The example were tested and output has been shared in the same post.

Authentication.java

package com.dineshkrish.rmi;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Authentication extends Remote {
public boolean authenticate(String userName, String password) throws RemoteException ;
}

AuthenticationImpl.java

package com.dineshkrish.rmi;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class AuthenticationImpl extends UnicastRemoteObject implements Authentication {
protected AuthenticationImpl() throws RemoteException {
}
@Override
public boolean authenticate(String userName, String password)
throws RemoteException {
if ((userName != null && !userName.isEmpty())
&& (password != null && !password.isEmpty())) {
if((userName.equalsIgnoreCase("admin")) 
&& (password.equalsIgnoreCase("admin"))) {
return true;
}
}
return false;
}
}

Server.java

package com.dineshkrish.rmi;
import java.rmi.AlreadyBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class Server {
// Port Number you can change based on your system availability
private static final int PORT = 5252;
public static void main(String[] args) {
try {
// Defining Object
Authentication authentication = new AuthenticationImpl();
// Creating RMI Registry with Port
Registry registry = LocateRegistry.createRegistry(PORT);
// Binding the Object
registry.bind("auth", authentication);
System.out.println("Authentication Service running at "+PORT+" port...");
} catch (RemoteException e) {
System.out.println(e.getMessage());
e.printStackTrace();
} catch (AlreadyBoundException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}

ApplicationClient.java

package com.dineshkrish.rmi;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.util.Scanner;
public class ApplicationClient {
public static void main(String[] args) {
Authentication authentication = null;
try {
// Getting Object using Remote Address
authentication = (Authentication)Naming.lookup("rmi://localhost:5252/auth");
Scanner scanner = new Scanner(System.in);
System.out.println("Enter the username : ");
String userName = scanner.next();
System.out.println("Enter the password : ");
String password = scanner.next();
// Invoking the Method
boolean status = authentication.authenticate(userName, password);
if(status) {
System.out.println("You are an authorized user...");
// Do Something....
} else {
System.out.println("Unauthorized Login Attempt");
}
scanner.close();
} catch (MalformedURLException e) {
System.out.println(e.getMessage());
e.printStackTrace();
} catch (RemoteException e) {
System.out.println(e.getMessage());
e.printStackTrace();
} catch (NotBoundException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}

Running Server Program

Authentication Service running at 5252 port…

Running Client Program

Enter the username : admin
Enter the password : admin
You are an authorized user…

Download Source Code

Download Here

References

1. Java RMI API JavaDocs
2. How to Create Simple RMI Application using Java