Kamis, 03 Juli 2014

Membuat Aplikasi Browser Dengan Menggunakan Bahasa Pemrograman Java

Program ini digunakan untuk membuat pilihan browsing berdasarkan pilihan yang kita buat. Pastikan anda sedang terkoneksi internet, selanjutnya kita jalankan program browsing.java dengan cara mengklik ctrl+1 untuk memastikan bahwa program sudah berjalan dengan benar, kemudian klik tombol ctrl+2. Berikut adalah listing dari aplikasi browser:

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.Scanner;
public class inibrowser{
public static void main
(String[] args)
{
try {
BufferedReader input= new BufferedReader
(new InputStreamReader(System.in));

int menu=0;
int pil;
Scanner masuk = new Scanner(System.in);
while(menu==0)
{
System.out.println
("==================================");
System.out.println
("1.Membuka URL web *");
System.out.println
("2.Pencarian Google *");
System.out.println
("3.Pencarian Gambar di Google *");
System.out.println
("4.Google Translate *");
System.out.println
("5.Cari berita *");
System.out.println
("6.EXIT *");
System.out.println
("==================================");
System.out.println
("");
System.out.println
("Masukkan Pilihan :");

pil = masuk.nextInt();
if
(pil < 1 || pil > 6)
{
System.out.print("");
System.out.print("");
System.out.println("Input Salah!!");
}
else if
(pil==6)
{
System.exit
(0)
;}
switch(pil)
{

case 1:
String URL = null;
System.out.print
("Masukkan URL :");
URL = input.readLine();
java.awt.Desktop.getDesktop().browse(java.net.URI.create(URL));

break;
case 2:
String src2 = null;
System.out.print
("Masukkan Kata Pencarian :");
src2 = input.readLine();
java.awt.Desktop.getDesktop().browse(java.net.URI.create("https://www.google.com/search?q="+ src2));

break;
case 3:
String gmbr3 = null;
System.out.print
("Masukkan Nama Gambar :");
gmbr3 = input.readLine();
java.awt.Desktop.getDesktop().browse(java.net.URI.create
("https://www.google.co.id/search?site=imghp&tbm=isch&source=hp&biw=1360&bih=642&q="+gmbr3));

break;
case 4:
String kata4 = null;
System.out.print
("Masukkan Kata Yang akan di terjemah : ")
;
kata4 = input.readLine();
java.awt.Desktop.getDesktop().browse(java.net.URI.create("https://translate.google.co.id/?hl=id&tab=wT#en/id/"+kata4));

break;
case 5:
String kata5 = null;
System.out.print
("Masukkan berita yang dicari : ");
kata5= input.readLine();
java.awt.Desktop.getDesktop().browse(java.net.URI.create("http://search.viva.co.id/search?m=art&q="+kata5));

break;
}
}
}
catch
(
Exception ex
)
{System.out.println
("Error")
;}
}

}

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Membuat Aplikasi Client Server Dengan Bahasa Pemrograman Java

1.1       PENDAHULUAN
Bahasa pemrograman java banyak diaplikasikan dalam berbagai program maupun aplikasi yang berbasis PC atau mobile. Salah satu penerapannya adalah pada program chatting, dipilihnya bahasa java sebagai bahasa pembuatan program ini dikarenakan dalam java memiliki kelas thread sebagai kelas default yang tidak dimiliki oleh bahasa pemrograman lain. Program chat ini terdiri dari dua sisi, yaitu sisi client dan server.  Dalam pembuatan aplikasi chatting ini, kita harus menyiapkan dua buah PC/Laptop atau lebih untuk satu dijadikan sebagai server, dan yang lainnya dijadikan sebagai Client.

1.2       PEMBAHASAN
1.2.1    Pembahasan Source Code
1.2.1.1 Pembahasan kelas Server

public class iniserver {
private static ServerSocket serverSocket;
private static final int PORT = 1111;

Kode diatas merupakan perintah agar socket server hanya dapat diakses oleh sendiri. Port = 1111 merupakan port yang disiapkan pada server diatas. iniserver merupakan nama kelas program javanya.

public static void main(String[] args) throws IOException {
        try {
            serverSocket = new ServerSocket(PORT);
            System.out.println("Server berjalan, menunggu client...");
        } catch (IOException ioEx) {
            System.out.println("\nTidak dapat mensetup port!");
            System.exit(1);
        }

Kode diatas merupakan perintah untuk membuat sebuar socket server bernama serverSocket. “Server berjalan, menunggu client…” akan muncul ketika program dijalankan. "\nTidak dapat mensetup port!" akan muncul ketika program dijalankan saat masih ada program yang sama yang dijalankan.


do {
           
            Socket client = serverSocket.accept();
            System.out.println("\nClient baru diterima.\n");

            ClientHandler handler = new ClientHandler(client);
            handler.start();   
        } while (true);

            Kode diatas merupakan perintah untuk menunggu client terhubung / connect pada server. Selama masih ada client yang ingin masuk maka server tetap bisa menerima client tersebut.

class ClientHandler extends Thread {

    private Socket client;
    private Scanner input;
    private PrintWriter output;
    private Scanner userEntry;

    public ClientHandler(Socket socket) {
        client = socket;

        try {
            input = new Scanner(client.getInputStream());
            output = new PrintWriter(client.getOutputStream(), true);
            userEntry = new Scanner(System.in);
        } catch (IOException ioEx) {
            //ioEx.printStackTrace();

            Kode diatas merupakan thread untuk mensetup referensi ke socket. Input merupakan Scanner untuk mendapatkan input. Output merupakan perintah agar menerima masukan dari keyboard.

public void run() {
        String received;
        String message;
        do {
            received = input.nextLine();
            System.out.println(received);
            System.out.print("");

            System.out.print("server: ");
      message = userEntry.nextLine();
 output.println(message);
        } while (!received.equals("QUIT"));

Kode diatas berfungsi untuk menerima dan mengirimkan pesan pada input stream socket. Program diatas akan terus berjalan selama client tidak mengirimkan pesan QUIT.

                                    try {
                            if (client != null) {
                            System.out.println("Menutup koneksi...");
                           client.close();
                           } 
                           } catch (IOException ioEx) {

                          System.out.println("Penutupan koneksi gagal!");

Kode diatas berfungsi untuk mengakhiri program.


1.2.2.2 Pembahasan kelas Client

public class Client {
    private static InetAddress host;
    private static final int PORT = 1111;

    public static void main(String[] args) {
        try {
            host = InetAddress.getLocalHost();
        } catch (UnknownHostException uhEx) {
            System.out.println("\nHost ID tidak ditemukan!\n");
            System.exit(1);
        }
        sendMessages();
    }

Kode diatas merupakan perintah agar socket server hanya dapat diakses oleh sendiri. Port = 1111 merupakan port yang disiapkan pada server diatas. client merupakan nama kelas program javanya.

private static void sendMessages() {
        Socket socket = null;
        try {
            socket = new Socket(host, PORT);
            Scanner networkInput = new Scanner(socket.getInputStream());
            PrintWriter networkOutput = new PrintWriter(socket.getOutputStream(),
true);
            Scanner userEntry = new Scanner(System.in);
            String message, response;
            do {
                System.out.print("klien 1: ");
                message = userEntry.nextLine();
                networkOutput.println(message);
                response = networkInput.nextLine();
                System.out.println("\nSERVER> " + response);
            } while (!message.equals("QUIT"));

Kode diatas merupakan perintah untuk mensetup stream untuk masukan dari keyboard, yang kemudian di scan oleh scanner UserEntry dan di simpan dalam string message. Setelah itu program akan mengirimkan pesan ke server dan menunggu server merespon pesan tersebut. Kode akan berjalan selama message tidak menampilkan QUIT.

try {
                System.out.println("\nMenutup koneksi...");
                socket.close();
            } catch (IOException ioEx) {
                System.out.println("Gagal menutup koneksi!");
                System.exit(1);

            Kode diatas merupakan perintah untuk mengakhiri program ketika user akan keluar.

1.3       Lampiran
1.3.1    Kelas Server

Berikut adalah listing program aplikasi chatting kelas server:

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class iniserver {

    private static ServerSocket serverSocket;
    private static final int PORT = 1111;


    public static void main(String[] args) throws IOException {
        try {
            serverSocket = new ServerSocket(PORT);
            System.out.println("Server berjalan, menunggu client...");
        } catch (IOException ioEx) {
            System.out.println("\nTidak dapat mensetup port!");
            System.exit(1);
        }
        do {
            //Menunggu koneksi dari client...
            Socket client = serverSocket.accept();
            System.out.println("\nClient baru diterima.\n");

            //Buat thread untuk menangani komunikasi dengan client ini
            //lewatkan socket yang relevan ke contructor dari  thread ini
            ClientHandler handler = new ClientHandler(client);
            handler.start();    //menjalankan thread yang telah dibuat
        } while (true);
    }
}

class ClientHandler extends Thread {

    private Socket client;
    private Scanner input;
    private PrintWriter output;
    private Scanner userEntry;

    public ClientHandler(Socket socket) {
        //Set up referensi ke socket yang berasosiasi...
        client = socket;

        try {
            input = new Scanner(client.getInputStream());
            output = new PrintWriter(client.getOutputStream(), true);
            userEntry = new Scanner(System.in);
        } catch (IOException ioEx) {
            //ioEx.printStackTrace();
        }
    }

    public void run() {
        String received;
        String message;
        do {
            //Terima pesan dari client pada input stream socket...
            received = input.nextLine();
            System.out.println(received);
            System.out.print("");


            System.out.print("server: ");
            message = userEntry.nextLine();

         //Kirim pesan (message)ke client pada output stream socket...
      //Terima respon dari client pada stream input socket...
          output.println(message);


            //Ulangi sampai client mengirimkan pesan 'KELUAR'...
        } while (!received.equals("KELUAR"));

        try {
            if (client != null) {
                System.out.println("Menutup koneksi...");
                client.close();
            }
        } catch (IOException ioEx) {

            System.out.println("Penutupan koneksi gagal!");
        }
    }
}


1.3.2 Kelas Client

Berikut adalah listing program aplikasi chatting kelas client:

import java.io.*;
import java.net.*;
import java.util.Scanner;

public class Client {

    private static InetAddress host;
    private static final int PORT = 1111;

    public static void main(String[] args) {
        try {
            host = InetAddress.getLocalHost();
        } catch (UnknownHostException uhEx) {
            System.out.println("\nHost ID tidak ditemukan!\n");
            System.exit(1);
        }
        sendMessages();
    }

    private static void sendMessages() {
        Socket socket = null;
        try {
            socket = new Socket(host, PORT);
            Scanner networkInput = new Scanner(socket.getInputStream());
            PrintWriter networkOutput = new PrintWriter(socket.getOutputStream(), true);

            //Set up stream untuk masukan dari keyboard...
            Scanner userEntry = new Scanner(System.in);
            String message, response;
            do {
                System.out.print("klien 1: ");
                message = userEntry.nextLine();

                //Kirim pesan (message)ke server pada output stream socket...
                //Terima respon dari server pada stream input socket...
                networkOutput.println(message);
                response = networkInput.nextLine();

                //Tampilkan respon dari server...
                System.out.println("\nSERVER> " + response);
            } while (!message.equals("KELUAR"));
        } catch (IOException ioEx) {
            //ioEx.printStackTrace();
        } finally {
            try {
                System.out.println("\nMenutup koneksi...");
                socket.close();
            } catch (IOException ioEx) {
                System.out.println("Gagal menutup koneksi!");
                System.exit(1);
            }
        }
    }

}

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Membuat Program MultiClient Chatting Client-Server Menggunakan Bahasa Pemrograman Java Berbasis Grafis

Chatting   memungkinkan   kita   untuk   selalu   bisa berkomunikasi walaupun kita tidak berada bersamanya di suatu tempat. Aplikasi chatting merupakan  suatu  aplikasi  yang  memungkinkan  pengguna  (client)  berkomunikasi  teks secara langsung (Real Time) dengan pengguna lain dengan menggunakan media yang ada.
Java merupakan suatu bahasa pemograman  yang multi platform dan multi device. Java juga merupakan bahasa pemograman  yang berorientasi objek dan program java tersusun dari bagian  yang disebut kelas. 
Pada bagian ini, saya akan membuat aplikasi chatting berbasis grafis (seperti tampilan foto) menggunakan bahasa pemograman java. pertama yang harus dilakukan adalah menyetting alamat IP pada masing-masing PC. Kita menggunakan satu server dan satu client. 
Pertama  yang  harus  dilakukan  kita  terlebih  dahulu  melakukan  setting  alamat  IP  pada masing-masing client. Setelah  melakukan  konfigurasi  IP  pada  masing-masingi  komputer  kemudian  kita  juga harus memastikan bahwa firewall pada masing-masing komputer harus diaktifkan karena pada beberapa kasus program ini tidak dapat saling terkoneksi akibat firewall yang aktif pada sistem operasinya.

Berikut adalah listing program MultiClient Chatting Client-Server berbasis grafis (gambar)

·      ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer {
    private static int uniqueId;
    private ArrayList<ChatServer.ClientThread> clients;
    private int port;
    private boolean keepGoing;

    public ChatServer() {
        this.port = 9999;
        clients = new ArrayList();
    }

    public void start() {
        keepGoing = true;
        try {
            ServerSocket serverSocket = new ServerSocket(port);
            while (keepGoing) {
                System.out.println("ChatServer waiting for Clients on port " + port + ".");
                Socket socket = serverSocket.accept();
                if (!keepGoing) {
                    break;
                }
                ChatServer.ClientThread t = new ChatServer.ClientThread(socket);
                clients.add(t);
                t.start();
                send("login~" + t.username + "~" + t.username + " sedang login...~Server~\n");
            }
            try {
                serverSocket.close();
                for (int i = 0; i < clients.size(); ++i) {
                    ChatServer.ClientThread tc = clients.get(i);
                    try {
                        tc.sInput.close();
                        tc.sOutput.close();
                        tc.socket.close();
                    } catch (IOException ioE) {
                    }
                }
            } catch (Exception e) {
                System.out.println("Exception closing the server and clients: " + e);
            }
        } catch (IOException e) {
            String msg = "Exception on new ServerSocket: " + e + "\n";
            System.out.println(msg);
        }
    }

    private synchronized void send(String message) {
        for (int i = clients.size(); --i >= 0;) {
            ChatServer.ClientThread ct = clients.get(i);
            if (!ct.writeMsg(message)) {
                clients.remove(i);
                System.out.println("Disconnected Client " + ct.username + " removed from list.");
            }
        }
    }

    private String getClients() {
        String s = "";
        for (ClientThread clientThread : clients) {
            s += clientThread.username + ":";
        }
        s += "---";
        System.out.println(s);
        return s;
    }

    private synchronized void remove(int id) {
        for (int i = 0; i < clients.size(); ++i) {
            ChatServer.ClientThread ct = clients.get(i);
            if (ct.id == id) {
                clients.remove(i);
                return;
            }
        }
    }

    public static void main(String[] args) {
        ChatServer server = new ChatServer();
        server.start();
    }

    private class ClientThread extends Thread {

        private Socket socket;
        private ObjectInputStream sInput;
        private ObjectOutputStream sOutput;
        private int id;
        private String username;

        public ClientThread(Socket socket) {
            id = ++uniqueId;
            this.socket = socket;
            System.out.println("Menciptakan Object Input/Output Streams");
            try {
                sOutput = new ObjectOutputStream(socket.getOutputStream());
                sInput = new ObjectInputStream(socket.getInputStream());
                String message = (String) sInput.readObject();
                username = message.split("~")[1];
                System.out.println(username + " masuk.");
            } catch (IOException e) {
                System.out.println("Exception creating new Input/output Streams: " + e);
            } catch (ClassNotFoundException e) {
            }
        }

        @Override
        public void run() {
            boolean keepGoing = true;
            while (keepGoing) {

                String message;
                try {
                    message = sInput.readObject().toString();
                } catch (IOException e) {
                    System.out.println(username + " Exception reading Streams: " + e);
                    break;
                } catch (ClassNotFoundException e2) {
                    break;
                }

                String type = message.split("~")[0];
                String pengirim = message.split("~")[1];
                String text = message.split("~")[2];
                String kepada = message.split("~")[3];
                String response;

                switch (type) {
                    case "postText":
                        response = "recieveText~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "postPrivateText":
                        response = "recievePrivateText~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "login":
                        response = "login~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "logout":
                        response = "logout~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "list":
                        response = "list~server~" + getClients() + "~ ~ ~ ~ ~\n";
                        send(response);
                        break;
                }
            }

            remove(id);
            close();
        }

        private void close() {
            try {
                if (sOutput != null) {
                    sOutput.close();
                }
            } catch (Exception e) {
            }
            try {
                if (sInput != null) {
                    sInput.close();
                }
            } catch (Exception e) {
            }
            try {
                if (socket != null) {
                    socket.close();
                }
            } catch (Exception e) {
            }
        }

        private boolean writeMsg(String msg) {
            if (!socket.isConnected()) {
                close();
                return false;
            }
            try {
                sOutput.writeObject(msg);
            } catch (IOException e) {
                System.out.println("Error sending message to " + username);
                System.out.println(e.toString());
            }
            return true;
        }
    }
}

·      ChatClient.java
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.table.DefaultTableModel;

public class ChatClient extends javax.swing.JFrame {

    /**
     * Creates new form ChatClient
     */
    private ObjectInputStream input;
    private ObjectOutputStream output;
    private Socket socket;
    private String server, username;
    private int port;
    private List<String> clients;

    public ChatClient() {
        clients = new ArrayList();
        initComponents();

    }

    public boolean start() {
        try {
            socket = new Socket(server, port);
        } catch (Exception ec) {
            System.out.println("Error connectiong to server:" + ec);
            return false;
        }

        String msg = "Connection accepted " + socket.getInetAddress() + ":" + socket.getPort();
        System.out.println(msg);

        try {
            input = new ObjectInputStream(socket.getInputStream());
            output = new ObjectOutputStream(socket.getOutputStream());
        } catch (IOException eIO) {
            System.out.println("Exception creating new Input/output Streams: " + eIO);
            return false;
        }

        new ChatClient.ListenFromServer().start();

        try {
            output.writeObject("login~" + username + "~" + username + " sedang login...~server~\n");
            output.writeObject("list~" + username + "~" + username + " sedang login...~server~\n");

        } catch (IOException eIO) {
            System.out.println("Exception doing login : " + eIO);
            disconnect();
            return false;
        }

        return true;
    }

    private void disconnect() {
        try {
            // TODO add your handling code here:
            output.writeObject("logout~" + username + "~" + username + " sudah logout...~Server~\n");
        } catch (IOException ex) {
            //Logger.getLogger(ChatClient.class.getName()).log(Level.SEVERE, null, ex);
        }

        try {
            if (input != null) {
                input.close();
            }
        } catch (Exception e) {
        }
        try {
            if (output != null) {
                output.close();
            }
        } catch (Exception e) {
        }
        try {
            if (socket != null) {
                socket.close();
            }
        } catch (Exception e) {
        }
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        viewTextArea = new javax.swing.JTextArea();
        jScrollPane2 = new javax.swing.JScrollPane();
        clientTable = new javax.swing.JTable();
        postTextField = new javax.swing.JTextField();
        kirimButton = new javax.swing.JButton();
        lbljpg   = new javax.swing.JLabel(new ImageIcon("E:/rara.jpg"));
        jLabel2 = new javax.swing.JLabel();
        serverTextField = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        portTextField = new javax.swing.JTextField();
        masukButton = new javax.swing.JButton();
        jLabel4 = new javax.swing.JLabel();
        usernameTextField = new javax.swing.JTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        viewTextArea.setEditable(false);
        viewTextArea.setColumns(20);
        viewTextArea.setLineWrap(true);
        viewTextArea.setRows(5);
        viewTextArea.setFocusable(false);
        jScrollPane1.setViewportView(viewTextArea);

        jScrollPane2.setViewportView(clientTable);

        postTextField.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                postTextFieldActionPerformed(evt);
            }
        });

        kirimButton.setText("Kirim");
        kirimButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                kirimButtonActionPerformed(evt);
            }
        });

        jLabel2.setText("Server");

        serverTextField.setText("10.17.0.0");

        jLabel3.setText("Port");

        portTextField.setText("9999");

        masukButton.setText("Masuk");
        masukButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                masukButtonActionPerformed(evt);
            }
        });

        jLabel4.setText("Username");

        usernameTextField.setText("Rara Ariesta");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(postTextField)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(kirimButton))
                            .addComponent(jScrollPane1))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 259, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(lbljpg)
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(serverTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 167, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(portTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(jLabel4)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(usernameTextField, javax.swing.GroupLayout.DEFAULT_SIZE, 194, Short.MAX_VALUE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(masukButton)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(lbljpg)
                    .addComponent(jLabel2)
                    .addComponent(serverTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3)
                    .addComponent(portTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(masukButton)
                    .addComponent(jLabel4)
                    .addComponent(usernameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 427, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(postTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(kirimButton))))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    private void masukButtonActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        this.server = serverTextField.getText();
        this.port = new Integer(portTextField.getText());
        this.username = usernameTextField.getText();
        start();
    }

    private void kirimButtonActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        try {
            String message = "postText~" + username + "~" + postTextField.getText() + "~all~\n";
            output.writeObject(message);
            postTextField.setText("");
        } catch (IOException ex) {
            Logger.getLogger(ChatClient.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void postTextFieldActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        kirimButtonActionPerformed(evt);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
                /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {

                new ChatClient().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JTable clientTable;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JButton kirimButton;
    private javax.swing.JButton masukButton;
    private javax.swing.JTextField portTextField;
    private javax.swing.JTextField postTextField;
    private javax.swing.JTextField serverTextField;
    private javax.swing.JTextField usernameTextField;
    private javax.swing.JTextArea viewTextArea;
    private JLabel lbljpg ;
    // End of variables declaration

    class ListenFromServer extends Thread {

        @Override
        public void run() {
            while (true) {
                try {
                    String msg = (String) input.readObject();
                    String res;
                    String type = msg.split("~")[0];
                    String pengirim = msg.split("~")[1];
                    String text = msg.split("~")[2];
                    String kepada = msg.split("~")[3];
                    switch (type) {
                        case "recieveText":
                            res = pengirim + ": " + text;
                            viewTextArea.setText(viewTextArea.getText() + res + "\n");
                            break;
                        case "recievePrivateText":
                            res = pengirim + ": " + text;
                            if (kepada.equals(username)) {
                                viewTextArea.setText(viewTextArea.getText() + res + "\n");
                            }
                            break;
                        case "login":
                            viewTextArea.setText(viewTextArea.getText() + pengirim + " sudah login..." + "\n");
                            clients.add(pengirim);
                            break;
                        case "logout":
                            viewTextArea.setText(viewTextArea.getText() + pengirim + " telah logout..." + "\n");
                            clients.remove(pengirim);
                            break;
                        case "list":
                            setTable(text);
                            break;
                    }
                } catch (IOException e) {
                    Chatting   memungkinkan   kita   untuk   selalu   bisa berkomunikasi walaupun kita tidak berada bersamanya di suatu tempat. Aplikasi chatting merupakan  suatu  aplikasi  yang  memungkinkan  pengguna  (client)  berkomunikasi  teks secara langsung (Real Time) dengan pengguna lain dengan menggunakan media yang ada.
Java merupakan suatu bahasa pemograman  yang multi platform dan multi device. Java juga merupakan bahasa pemograman  yang berorientasi objek dan program java tersusun dari bagian  yang disebut kelas. 
Pada bagian ini, saya akan membuat aplikasi chatting berbasis grafis (seperti tampilan foto) menggunakan bahasa pemograman java. pertama yang harus dilakukan adalah menyetting alamat IP pada masing-masing PC. Kita menggunakan satu server dan satu client. 
Pertama  yang  harus  dilakukan  kita  terlebih  dahulu  melakukan  setting  alamat  IP  pada masing-masing client. Setelah  melakukan  konfigurasi  IP  pada  masing-masingi  komputer  kemudian  kita  juga harus memastikan bahwa firewall pada masing-masing komputer harus diaktifkan karena pada beberapa kasus program ini tidak dapat saling terkoneksi akibat firewall yang aktif pada sistem operasinya.
Berikut adalah listing program MultiClient Chatting Client-Server berbasis grafis (gambar)
·      ChatServer.java
import java.io.*;
import java.net.*;
import java.util.*;

public class ChatServer {
    private static int uniqueId;
    private ArrayList<ChatServer.ClientThread> clients;
    private int port;
    private boolean keepGoing;

    public ChatServer() {
        this.port = 9999;
        clients = new ArrayList();
    }

    public void start() {
        keepGoing = true;
        try {
            ServerSocket serverSocket = new ServerSocket(port);
            while (keepGoing) {
                System.out.println("ChatServer waiting for Clients on port " + port + ".");
                Socket socket = serverSocket.accept();
                if (!keepGoing) {
                    break;
                }
                ChatServer.ClientThread t = new ChatServer.ClientThread(socket);
                clients.add(t);
                t.start();
                send("login~" + t.username + "~" + t.username + " sedang login...~Server~\n");
            }
            try {
                serverSocket.close();
                for (int i = 0; i < clients.size(); ++i) {
                    ChatServer.ClientThread tc = clients.get(i);
                    try {
                        tc.sInput.close();
                        tc.sOutput.close();
                        tc.socket.close();
                    } catch (IOException ioE) {
                    }
                }
            } catch (Exception e) {
                System.out.println("Exception closing the server and clients: " + e);
            }
        } catch (IOException e) {
            String msg = "Exception on new ServerSocket: " + e + "\n";
            System.out.println(msg);
        }
    }

    private synchronized void send(String message) {
        for (int i = clients.size(); --i >= 0;) {
            ChatServer.ClientThread ct = clients.get(i);
            if (!ct.writeMsg(message)) {
                clients.remove(i);
                System.out.println("Disconnected Client " + ct.username + " removed from list.");
            }
        }
    }

    private String getClients() {
        String s = "";
        for (ClientThread clientThread : clients) {
            s += clientThread.username + ":";
        }
        s += "---";
        System.out.println(s);
        return s;
    }

    private synchronized void remove(int id) {
        for (int i = 0; i < clients.size(); ++i) {
            ChatServer.ClientThread ct = clients.get(i);
            if (ct.id == id) {
                clients.remove(i);
                return;
            }
        }
    }

    public static void main(String[] args) {
        ChatServer server = new ChatServer();
        server.start();
    }

    private class ClientThread extends Thread {

        private Socket socket;
        private ObjectInputStream sInput;
        private ObjectOutputStream sOutput;
        private int id;
        private String username;

        public ClientThread(Socket socket) {
            id = ++uniqueId;
            this.socket = socket;
            System.out.println("Menciptakan Object Input/Output Streams");
            try {
                sOutput = new ObjectOutputStream(socket.getOutputStream());
                sInput = new ObjectInputStream(socket.getInputStream());
                String message = (String) sInput.readObject();
                username = message.split("~")[1];
                System.out.println(username + " masuk.");
            } catch (IOException e) {
                System.out.println("Exception creating new Input/output Streams: " + e);
            } catch (ClassNotFoundException e) {
            }
        }

        @Override
        public void run() {
            boolean keepGoing = true;
            while (keepGoing) {

                String message;
                try {
                    message = sInput.readObject().toString();
                } catch (IOException e) {
                    System.out.println(username + " Exception reading Streams: " + e);
                    break;
                } catch (ClassNotFoundException e2) {
                    break;
                }

                String type = message.split("~")[0];
                String pengirim = message.split("~")[1];
                String text = message.split("~")[2];
                String kepada = message.split("~")[3];
                String response;

                switch (type) {
                    case "postText":
                        response = "recieveText~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "postPrivateText":
                        response = "recievePrivateText~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "login":
                        response = "login~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "logout":
                        response = "logout~" + pengirim + "~" + text + "~" + kepada + "~\n";
                        send(response);
                        break;
                    case "list":
                        response = "list~server~" + getClients() + "~ ~ ~ ~ ~\n";
                        send(response);
                        break;
                }
            }

            remove(id);
            close();
        }

        private void close() {
            try {
                if (sOutput != null) {
                    sOutput.close();
                }
            } catch (Exception e) {
            }
            try {
                if (sInput != null) {
                    sInput.close();
                }
            } catch (Exception e) {
            }
            try {
                if (socket != null) {
                    socket.close();
                }
            } catch (Exception e) {
            }
        }

        private boolean writeMsg(String msg) {
            if (!socket.isConnected()) {
                close();
                return false;
            }
            try {
                sOutput.writeObject(msg);
            } catch (IOException e) {
                System.out.println("Error sending message to " + username);
                System.out.println(e.toString());
            }
            return true;
        }
    }
}

·      ChatClient.java
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.table.DefaultTableModel;

public class ChatClient extends javax.swing.JFrame {

    /**
     * Creates new form ChatClient
     */
    private ObjectInputStream input;
    private ObjectOutputStream output;
    private Socket socket;
    private String server, username;
    private int port;
    private List<String> clients;

    public ChatClient() {
        clients = new ArrayList();
        initComponents();

    }

    public boolean start() {
        try {
            socket = new Socket(server, port);
        } catch (Exception ec) {
            System.out.println("Error connectiong to server:" + ec);
            return false;
        }

        String msg = "Connection accepted " + socket.getInetAddress() + ":" + socket.getPort();
        System.out.println(msg);

        try {
            input = new ObjectInputStream(socket.getInputStream());
            output = new ObjectOutputStream(socket.getOutputStream());
        } catch (IOException eIO) {
            System.out.println("Exception creating new Input/output Streams: " + eIO);
            return false;
        }

        new ChatClient.ListenFromServer().start();

        try {
            output.writeObject("login~" + username + "~" + username + " sedang login...~server~\n");
            output.writeObject("list~" + username + "~" + username + " sedang login...~server~\n");

        } catch (IOException eIO) {
            System.out.println("Exception doing login : " + eIO);
            disconnect();
            return false;
        }

        return true;
    }

    private void disconnect() {
        try {
            // TODO add your handling code here:
            output.writeObject("logout~" + username + "~" + username + " sudah logout...~Server~\n");
        } catch (IOException ex) {
            //Logger.getLogger(ChatClient.class.getName()).log(Level.SEVERE, null, ex);
        }

        try {
            if (input != null) {
                input.close();
            }
        } catch (Exception e) {
        }
        try {
            if (output != null) {
                output.close();
            }
        } catch (Exception e) {
        }
        try {
            if (socket != null) {
                socket.close();
            }
        } catch (Exception e) {
        }
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        viewTextArea = new javax.swing.JTextArea();
        jScrollPane2 = new javax.swing.JScrollPane();
        clientTable = new javax.swing.JTable();
        postTextField = new javax.swing.JTextField();
        kirimButton = new javax.swing.JButton();
        lbljpg   = new javax.swing.JLabel(new ImageIcon("E:/rara.jpg"));
        jLabel2 = new javax.swing.JLabel();
        serverTextField = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        portTextField = new javax.swing.JTextField();
        masukButton = new javax.swing.JButton();
        jLabel4 = new javax.swing.JLabel();
        usernameTextField = new javax.swing.JTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        viewTextArea.setEditable(false);
        viewTextArea.setColumns(20);
        viewTextArea.setLineWrap(true);
        viewTextArea.setRows(5);
        viewTextArea.setFocusable(false);
        jScrollPane1.setViewportView(viewTextArea);

        jScrollPane2.setViewportView(clientTable);

        postTextField.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                postTextFieldActionPerformed(evt);
            }
        });

        kirimButton.setText("Kirim");
        kirimButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                kirimButtonActionPerformed(evt);
            }
        });

        jLabel2.setText("Server");

        serverTextField.setText("10.17.0.0");

        jLabel3.setText("Port");

        portTextField.setText("9999");

        masukButton.setText("Masuk");
        masukButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                masukButtonActionPerformed(evt);
            }
        });

        jLabel4.setText("Username");

        usernameTextField.setText("Rara Ariesta");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(postTextField)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(kirimButton))
                            .addComponent(jScrollPane1))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 259, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(lbljpg)
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(serverTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 167, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(portTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(jLabel4)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(usernameTextField, javax.swing.GroupLayout.DEFAULT_SIZE, 194, Short.MAX_VALUE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(masukButton)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(lbljpg)
                    .addComponent(jLabel2)
                    .addComponent(serverTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3)
                    .addComponent(portTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(masukButton)
                    .addComponent(jLabel4)
                    .addComponent(usernameTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jScrollPane2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 427, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(postTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(kirimButton))))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    private void masukButtonActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        this.server = serverTextField.getText();
        this.port = new Integer(portTextField.getText());
        this.username = usernameTextField.getText();
        start();
    }

    private void kirimButtonActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        try {
            String message = "postText~" + username + "~" + postTextField.getText() + "~all~\n";
            output.writeObject(message);
            postTextField.setText("");
        } catch (IOException ex) {
            Logger.getLogger(ChatClient.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void postTextFieldActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        kirimButtonActionPerformed(evt);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
                /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(ChatClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {

                new ChatClient().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JTable clientTable;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JButton kirimButton;
    private javax.swing.JButton masukButton;
    private javax.swing.JTextField portTextField;
    private javax.swing.JTextField postTextField;
    private javax.swing.JTextField serverTextField;
    private javax.swing.JTextField usernameTextField;
    private javax.swing.JTextArea viewTextArea;
    private JLabel lbljpg ;
    // End of variables declaration

    class ListenFromServer extends Thread {

        @Override
        public void run() {
            while (true) {
                try {
                    String msg = (String) input.readObject();
                    String res;
                    String type = msg.split("~")[0];
                    String pengirim = msg.split("~")[1];
                    String text = msg.split("~")[2];
                    String kepada = msg.split("~")[3];
                    switch (type) {
                        case "recieveText":
                            res = pengirim + ": " + text;
                            viewTextArea.setText(viewTextArea.getText() + res + "\n");
                            break;
                        case "recievePrivateText":
                            res = pengirim + ": " + text;
                            if (kepada.equals(username)) {
                                viewTextArea.setText(viewTextArea.getText() + res + "\n");
                            }
                            break;
                        case "login":
                            viewTextArea.setText(viewTextArea.getText() + pengirim + " sudah login..." + "\n");
                            clients.add(pengirim);
                            break;
                        case "logout":
                            viewTextArea.setText(viewTextArea.getText() + pengirim + " telah logout..." + "\n");
                            clients.remove(pengirim);
                            break;
                        case "list":
                            setTable(text);
                            break;
                    }
                } catch (IOException e) {
                    System.out.println("Server has close the connection: " + e);
                    break;
                } catch (ClassNotFoundException e2) {
                }
            }
        }

        private void setTable(String text) {
            int rows = text.split(":").length - 1;
            Object[][] data = new Object[rows][1];
            for (int i = 0; i < rows; i++) {
                String t = text.split(":")[i];
                data[i][0] = t;
            }

            String[] header = {"Clients"};

            clientTable.setModel(new DefaultTableModel(data, header));
        }
    }
}
            Pastikan kita sudah terhubung ke internet. Lalu eksekusi program menggunakan ctrl+1 dan ctrl+2, maka tampilan akan seperti berikut:.out.println("Server has close the connection: " + e);
                    break;
                } catch (ClassNotFoundException e2) {
                }
            }
        }

        private void setTable(String text) {
            int rows = text.split(":").length - 1;
            Object[][] data = new Object[rows][1];
            for (int i = 0; i < rows; i++) {
                String t = text.split(":")[i];
                data[i][0] = t;
            }

            String[] header = {"Clients"};

            clientTable.setModel(new DefaultTableModel(data, header));
        }
    }
}

            Pastikan kita sudah terhubung ke internet. Lalu eksekusi program menggunakan ctrl+1 dan ctrl+2, maka tampilan akan seperti berikut:


Untuk lebih jelas lagi silakan Download disini
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