Membuat Chat Client

Pertama, Siapkan aplikasi untuk menuliskan perintah coding.

Jika menggunakan Sistem Operasi Windows, anda bisa menggunakan Textpad / Notepad kemudian akan di Compile/ Execute dengan Java.

Jika menggunakan Linux, anda bisa menggunakan Geany / Notepadqq kemudian akan di Compile /Execute dengan Java.

Lalu Tulis Perintah Coding seperti ini:

import java.net.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

class ChatClient extends JFrame{
JLabel lblPesan = new JLabel ("Kirim Pesan:");
TextArea taPesan = new TextArea(4,50);
JLabel lblBlasan = new JLabel ("Dari Teman:");
TextArea taBlasan = new TextArea(4,50);
JButton btnSend = new JButton("Send");
JButton btnOpen = new JButton("Open Connection");
JButton btnClose = new JButton("Close Connection");
Socket con = null;
ObjectOutputStream toServer;
ObjectInputStream fromServer;
String Blasan = null;
String inputIPServer;

public void openConnection(){
try{
inputIPServer=JOptionPane.showInputDialog("Inputkan IP Server");
con = new Socket(InetAddress.getByName(inputIPServer),2000);
toServer = new ObjectOutputStream(con.getOutputStream());
}
catch(EOFException ex){
;
}
catch(IOException io){
System.out.println("IO Exception");
io.printStackTrace();
}
}

public void sendData(){
try{
toServer.writeObject(taPesan.getText());
taPesan.setText("");
taPesan.requestFocus();
}
catch(EOFException ex){
;
}
catch(IOException io){
System.out.println("IO Exception");
io.printStackTrace();
}
}

public void getData(){
try{
fromServer = new ObjectInputStream(con.getInputStream());
Blasan = (String) fromServer.readObject();
taBlasan.setText(Blasan);
}
catch(ClassNotFoundException ex){
System.out.println("Error");
}
catch(EOFException ex){
;
}
catch(IOException io){
System.out.println("IO Exception");
io.printStackTrace();
}
}

public void closeConnection(){
try{
toServer.writeObject("bye");
con.close();
con = null;
}
catch (EOFException ex){
;
}
catch (IOException io){
System.out.println("IO Exception");
io.printStackTrace();
}
}

public ChatClient(){
Container c = getContentPane();
c.setLayout(new FlowLayout());
c.add(lblPesan);
c.add(taPesan);
c.add(lblBlasan);
c.add(taBlasan);
c.add(btnOpen);
c.add(btnSend);
c.add(btnClose);

btnOpen.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
openConnection();
}
});

btnSend.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
sendData();
getData();
}
});

btnClose.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
closeConnection();
}
});
}

public static void main(String[]args)
{
ChatClient klien = new ChatClient();
klien.setTitle("Chatting - Client");
klien.setLocation(300,300);
klien.setSize(500,200);
klien.setVisible(true);
klien.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent ev){
System.exit(0);
}
});
}
}

Program ChatServdr
import java.net.*;

lalu hasil outputnya akan seperti ini : 

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