Client-Server side GUI programming

I want to create a client-server side gui programming with java
i read this web adress
http://java.sun.com/docs/books/tutorial/networking/sockets/clientServer.html
for information but there are some parts that i didnt understand and wait for your help
i m trying to build an online-help(live chat) system so when people press the start chat button a java page will appear but i wonder how this will connect to the person who is on server side
i mean is it possible to 2 users connect the same port and chat with each other
I mean when user press the chat button the online help supporter will be informed somebody wants to speak with him and they will start a chat
how can i do something like that
any help would be usefull thanks

Below is an example of a client/server program.
It shows how the server listens for multiple clients.
* TriviaServerMulti.java
* Created on May 12, 2005
package server;
* @author johnz
import java.io.*;
import java.net.*;
import java.util.Random;
* This TriviaServer can handle multiple clientSockets simultaneously
* This is accomplished by:
* - listening for incoming clientSocket request in endless loop
* - spawning a new TriviaServer for each incoming request
* Client connects to server with:
* telnet <ip_address> <port>
*     <ip_address> = IP address of server
*  <port> = port of server
* In this case the port is 4413 , but server can listen on any port
* If server runs on the same PC as client use IP_addess = localhost
* The server reads file
* Note: a production server needs to handle start, stop and status commands
public class TriviaServerMulti implements Runnable {
    // Class variables
    private static final int WAIT_FOR_CLIENT = 0;
    private static final int WAIT_FOR_ANSWER = 1;
    private static final int WAIT_FOR_CONFIRM = 2;
    private static String[] questions;
    private static String[] answers;
    private static int numQuestions;
    // Instance variables
    private int num = 0;
    private int state = WAIT_FOR_CLIENT;
    private Random rand = new Random();
    private Socket clientSocket = null;
    public TriviaServerMulti(Socket clientSocket) {
        //super("TriviaServer");
        this.clientSocket = clientSocket;
    public void run() {
        // Ask trivia questions until client replies "N"
        while (true) {
            // Process questions and answers
            try {
                InputStreamReader isr = new InputStreamReader(clientSocket.getInputStream());
                BufferedReader is = new BufferedReader(isr);
//                PrintWriter os = new PrintWriter(new
//                   BufferedOutputStream(clientSocket.getOutputStream()), false);
                PrintWriter os = new PrintWriter(clientSocket.getOutputStream());
                String outLine;
                // Output server request
                outLine = processInput(null);
                os.println(outLine);
                os.flush();
                // Process and output user input
                while (true) {
                    String inLine = is.readLine();
                    if (inLine.length() > 0)
                        outLine = processInput(inLine);
                    else
                        outLine = processInput("");
                    os.println(outLine);
                    os.flush();
                    if (outLine.equals("Bye."))
                        break;
                // Clean up
                os.close();
                is.close();
                clientSocket.close();
                return;
            } catch (Exception e) {
                System.err.println("Error: " + e);
                e.printStackTrace();
    private String processInput(String inStr) {
        String outStr = null;
        switch (state) {
            case WAIT_FOR_CLIENT:
                // Ask a question
                outStr = questions[num];
                state = WAIT_FOR_ANSWER;
                break;
            case WAIT_FOR_ANSWER:
                // Check the answer
                if (inStr.equalsIgnoreCase(answers[num]))
                    outStr="\015\012That's correct! Want another (y/n)?";
                else
                    outStr="\015\012Wrong, the correct answer is "
                        + answers[num] +". Want another (y/n)?";
                state = WAIT_FOR_CONFIRM;
                break;
            case WAIT_FOR_CONFIRM:
                // See if they want another question
                if (!inStr.equalsIgnoreCase("N")) {
                    num = Math.abs(rand.nextInt()) % questions.length;
                    outStr = questions[num];
                    state = WAIT_FOR_ANSWER;
                } else {
                    outStr = "Bye.";
                    state = WAIT_FOR_CLIENT;
                break;
        return outStr;
    private static boolean loadData() {
        try {
            //File inFile = new File("qna.txt");
            File inFile = new File("data/qna.txt");
            FileInputStream inStream = new FileInputStream(inFile);
            byte[] data = new byte[(int)inFile.length()];
            // Read questions and answers into a byte array
            if (inStream.read(data) <= 0) {
                System.err.println("Error: couldn't read q&a.");
                return false;
            // See how many question/answer pairs there are
            for (int i = 0; i < data.length; i++)
                if (data[i] == (byte)'#')
                    numQuestions++;
            numQuestions /= 2;
            questions = new String[numQuestions];
            answers = new String[numQuestions];
            // Parse questions and answers into String arrays
            int start = 0, index = 0;
               String LineDelimiter = System.getProperty("line.separator");
               int len = 1 + LineDelimiter.length(); // # + line delimiter
            boolean isQuestion = true;
            for (int i = 0; i < data.length; i++)
                if (data[i] == (byte)'#') {
                    if (isQuestion) {
                        questions[index] = new String(data, start, i - start);
                        isQuestion = false;
                    } else {
                        answers[index] = new String(data, start, i - start);
                        isQuestion = true;
                        index++;
                start = i + len;
        } catch (FileNotFoundException e) {
            System.err.println("Exception: couldn't find the Q&A file.");
            return false;
        } catch (IOException e) {
            System.err.println("Exception: couldn't read the Q&A file.");
            return false;
        return true;
    public static void main(String[] arguments) {
        // Initialize the question and answer data
        if (!loadData()) {
            System.err.println("Error: couldn't initialize Q&A data.");
            return;
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(4413);
            System.out.println("TriviaServer up and running ...");
        } catch (IOException e) {
            System.err.println("Error: couldn't create ServerSocket.");
            System.exit(1);
        Socket clientSocket = null;
        // Endless loop: waiting for incoming client request
        while (true) {
            // Wait for a clientSocket
            try {
                clientSocket = serverSocket.accept();   // ServerSocket returns a client socket when client connects
            } catch (IOException e) {
                System.err.println("Error: couldn't connect to clientSocket.");
                System.exit(1);
            // Create a thread for each incoming request
            TriviaServerMulti server = new TriviaServerMulti(clientSocket);
            Thread thread = new Thread(server);
            thread.start(); // Starts new thread. Thread invokes run() method of server.
}This is the text file:
Which one of the Smothers Brothers did Bill Cosby once punch out?
(a) Dick
(b) Tommy
(c) both#
b#
What's the nickname of Dallas Cowboys fullback Daryl Johnston?
(a) caribou
(b) moose
(c) elk#
b#
What is triskaidekaphobia?
(a) fear of tricycles
(b) fear of the number 13
(c) fear of kaleidoscopes#
b#
What southern state is most likely to have an earthquake?
(a) Florida
(b) Arkansas
(c) South Carolina#
c#
Which person at Sun Microsystems came up with the name Java in early 1995?
(a) James Gosling
(b) Kim Polese
(c) Alan Baratz#
b#
Which figure skater is the sister of Growing Pains star Joanna Kerns?
(a) Dorothy Hamill
(b) Katarina Witt
(c) Donna De Varona#
c#
When this Old Man plays four, what does he play knick-knack on?
(a) His shoe
(b) His door
(c) His knee#
b#
What National Hockey League team once played as the Winnipeg Jets?
(a) The Phoenix Coyotes
(b) The Florida Panthers
(c) The Colorado Avalanche#
a#
David Letterman uses the stage name "Earl Hofert" when he appears in movies. Who is Earl?
(a) A crew member on his show
(b) His grandfather
(c) A character on Green Acres#
b#
Who created Superman?
(a) Bob Kane
(b) Jerome Siegel and Joe Shuster
(c) Stan Lee and Jack Kirby#
b#

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    I designed a client-server program as seen below basis on serversocket and thread
    I use serversocket for making a host connection than people connect this socket via applet that i designed then they transffer data with socket.getInputStream() and socket.getOutputStream but it always happening between client and server how can i make theese streams transfer between clients is something like that possible if it is how?
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    I made two java file , one for server one for client
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    here is my code if anyone could tell me where i made a mistake i would be very appreciate
    this is the client program
    import java.io.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
    import java.net.*;
    import javax.swing.*;
    import javax.swing.event.*;
    class client extends javax.swing.JFrame {
        private boolean baglandi;
        private MulticastSocket socket;
        private int port;
        private String ip;
        String username;
        private InetAddress group;
        private String msg;
        private DatagramPacket datawriter;
        private byte[] reader;
        private boolean calisiyor;
        private JScrollPane scrollpane;
        public client() {
            initComponents();
            this.setSize(490,450);
            jTextArea1.setEditable(false);
            jTextField2.setEditable(false);
            jButton2.setEnabled(false);
            jLabel3.setForeground(Color.RED);
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            panel.setBounds(0, 0, 480, 260);
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            scrollpane = new JScrollPane();
            scrollpane.getViewport().add(jTextArea1);
            panel.add(scrollpane,BorderLayout.CENTER);
            baglandi=false;
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            port=2222;
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            group = InetAddress.getByName(ip);
            msg ="";
            datawriter = new DatagramPacket(msg.getBytes(),msg.length(),group,port);
            calisiyor = false;
            catch(Exception e)
        private void initComponents() {
            jTextArea1 = new javax.swing.JTextArea();
            jLabel1 = new javax.swing.JLabel();
            jLabel2 = new javax.swing.JLabel();
            jTextField1 = new javax.swing.JTextField();
            jTextField2 = new javax.swing.JTextField();
            jButton1 = new javax.swing.JButton();
            jButton2 = new javax.swing.JButton();
            jButton3 = new javax.swing.JButton();
            jLabel3 = new javax.swing.JLabel();
            getContentPane().setLayout(null);
            addWindowListener(new java.awt.event.WindowAdapter() {
                public void windowClosing(java.awt.event.WindowEvent evt) {
                    exitForm(evt);
            getContentPane().add(jTextArea1);
            jTextArea1.setBounds(0, 0, 480, 260);
            jLabel1.setText("Kullanici Adi");
            getContentPane().add(jLabel1);
            jLabel1.setBounds(0, 270, 90, 15);
            jLabel2.setText("Mesaj");
            getContentPane().add(jLabel2);
            jLabel2.setBounds(0, 300, 60, 15);
            getContentPane().add(jTextField1);
            jTextField1.setBounds(100, 270, 290, 21);
            getContentPane().add(jTextField2);
            jTextField2.setBounds(100, 300, 290, 21);
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                    jButton2ActionPerformed(evt);
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                    jButton3ActionPerformed(evt);
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            getContentPane().add(jLabel3);
            jLabel3.setBounds(0, 360, 130, 15);
            pack();
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            durdur();
        private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
            printoutput();
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            baslat();
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        private void exitForm(java.awt.event.WindowEvent evt) {
            System.exit(0);
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                jTextArea1.append("Guvenlik Engellemesi Sebebiyle Sunucuya Ulasilamadi.\n");
                return;
                    jTextArea1.append("Sunucuya Baglanildi");
                    baglandi = true;
                    calisiyor = true;
                    jLabel3.setText("Baglanti Saglandi");
                    jTextArea1.append("Sunucuya Basariyla Baglanildi\n");
                    jLabel3.setForeground(Color.GREEN);
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                    jTextField1.setEditable(false);
                    jButton2.setEnabled(true);
                    jTextField2.setEditable(true);
                while (calisiyor)
                        String mesaj = readline();
                        printstring(mesaj);
                        if (mesaj == null) break;
        public void durdur()
            jTextField2.setEditable(false);
            jTextField1.setEditable(true);
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            jButton1.setEnabled(true);
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        public void printoutput()
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        public void writeline(String s) throws IOException
                try
                    msg = s;
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                    printstring("Mesaj ulastirilamadi.");
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        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JButton jButton3;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JLabel jLabel3;
        private javax.swing.JTextArea jTextArea1;
        private javax.swing.JTextField jTextField1;
        private javax.swing.JTextField jTextField2;
        // End of variables declaration
    this is the server program
    import java.net.*;
    import java.io.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
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        private MulticastSocket servsocket;
        private int port;
        private boolean calisiyor;
        private JScrollPane scrollpane;
        private techsupportbackground  background;
        private InetAddress group;
        public techsupport(String title) {
            super(title);
            initComponents();
            this.setSize(400,400);
            port=2222;
            jTextField1.addActionListener(this);
            jButton1.addActionListener(this);
            calisiyor=true;
            jTextArea1.setEditable(false);
            JPanel panel = new JPanel();
            panel.setLayout(new BorderLayout());
            panel.setBounds(0,10,400, 230);
            getContentPane().add(panel);
            scrollpane = new JScrollPane();
            scrollpane.getViewport().add(jTextArea1);
            panel.add(scrollpane,BorderLayout.CENTER);
                try
                group = InetAddress.getByName("228.5.6.7");
                catch(Exception e)
        private void initComponents() {
            jTextArea1 = new javax.swing.JTextArea();
            jButton1 = new javax.swing.JButton();
            jLabel1 = new javax.swing.JLabel();
            jButton2 = new javax.swing.JButton();
            jTextField1 = new javax.swing.JTextField();
            getContentPane().setLayout(null);
            addWindowListener(new java.awt.event.WindowAdapter() {
                public void windowClosing(java.awt.event.WindowEvent evt) {
                    exitForm(evt);
            getContentPane().add(jTextArea1);
            jTextArea1.setBounds(0, 10, 400, 230);
            jButton1.setText("Start");
            jButton1.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton1ActionPerformed(evt);
            getContentPane().add(jButton1);
            jButton1.setBounds(160, 260, 80, 25);
            jLabel1.setText("Port");
            getContentPane().add(jLabel1);
            jLabel1.setBounds(0, 240, 120, 15);
            jButton2.setText("Stop");
            jButton2.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton2ActionPerformed(evt);
            getContentPane().add(jButton2);
            jButton2.setBounds(250, 260, 90, 25);
            getContentPane().add(jTextField1);
            jTextField1.setBounds(0, 260, 130, 21);
            pack();
        private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
            try
            servsocket.close();
            jButton1.setEnabled(true);
            printstring("Port Kapatildi.");
            jTextArea1.setText("");
            catch(Exception e)
                printstring("Hata:"+e);
        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        private void exitForm(java.awt.event.WindowEvent evt) {
            System.exit(0);
        public static void main(String args[]) {
            new techsupport("Teknik Destek Sunucu").show();
        public void actionPerformed(ActionEvent e) {
            boolean status = false;
            String komut = e.getActionCommand();
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                    dispose();
        public void run()
            try
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                servsocket.joinGroup(group);
                jTextArea1.append("Kullanici Girisi Bekleniyor.\n");
            catch(IOException e)
                jTextArea1.append("Sunucu Uzerinde Socket Acilamadi.\n"+e.toString());
        public void printstring(String s)
            jTextArea1.append(s+"\n");
        // Variables declaration - do not modify
        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JLabel jLabel1;
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  • Problem client/server with GUI

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    Hello,
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    Haven't worked with this but possibly this method of "deactivation" is not valid in 11gR2? Have you cross checked that with Oracle support?

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    ~KZ
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    This response is not a tutorial, I hope it gives you some verbiage to use in further searches.
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    Edited by: KevinPas on May 1, 2013 9:56 AM

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    Edited by: zgliang on Sep 13, 2007 3:30 AM

    I'd like to suggest you read the topic "Questions RMI & Swing & SwingWorker", which is similar to yours.

  • Client/Server Program with GUI

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    1) The error is down to the fact that you don't have a constructor declared for class SendingThread that accepts an int.
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  • Multiple Clients in Client/Server Program

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    Edited by: mcox05 on May 21, 2009 10:58 AM
    Edited by: mcox05 on May 21, 2009 11:01 AM
    Edited by: mcox05 on May 21, 2009 11:03 AM
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