Write an RMI application where client supplies a string and server responds by sending the string in upper case. (Topics covered: Distributed application using java.rmi package )

Aim: Write an RMI application where client supplies a string and server responds by sending the string in upper case. (Topics covered: Distributed application using java.rmi package )

Client.java
import java.rmi.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class Client extends JFrame {
    TextField t1 = new TextField(30);
    TextField t2 = new TextField(30);
   
    JButton b = new JButton("Uppercase");
    Panel p = new Panel(new GridLayout(4, 1, 5, 5));
    RemoteInterface2 s;
     public Client() {
        super("Client Side");
        setSize(250, 250);
        setLocation(300, 300);
        getContentPane().add(p, "North");
        p.add(t1);
        p.add(t2);
        p.add(b);
      try {
            String ipp = JOptionPane.showInputDialog("Please enter the IP Address to Connect");
            String ip = "rmi://" + ipp + "/RMIAPPLICATION";
            s = (RemoteInterface2) Naming.lookup(ip);

        } catch (Exception exp) {
            JOptionPane.showMessageDialog(null, exp.getMessage());
        }
    b.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent evt) {
            String a = t1.getText();
try {
                        String r = s.upper(a);
                        t2.setText("String in  =" + r);
                 } catch (Exception epx) {
                }
            }
        });
    }
     public static void main(String args[]) {
        Client c = new Client();
        c.setDefaultCloseOperation(EXIT_ON_CLOSE);
        c.setVisible(true);
    }
}

Server.java
import java.rmi.*;
import java.net.*;

public class Server {

    public static void main(String args[]) {
        try {
            ServerImplements s = new ServerImplements();
            Naming.rebind("RMIAPPLICATION", s);
            System.out.println("Server has been started");
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

Remoteinterface
import java.rmi.*;

public interface RemoteInterface2 extends Remote
{
  public String upper(String x) throws Exception;
}

ServerImplements
import java.rmi.*;
import java.rmi.server.*;


public class ServerImplements extends UnicastRemoteObject implements
        RemoteInterface {

    public ServerImplements() throws Exception {
        super();
    }

public String upper(String x) throws Exception {
        String y = x.toUpperCase();
        return y;
    }
}