Need help about chatting application i made...

I have problem with my chatting application here. I made this using Netbeans and the problem i am facing is that if i sent multiline message to other clients, the other client only receive the first line i typed. The second and next lines are not sent. Honestly this code is not entirely mine since m still trying to make it as simple as posible as client-server introduction for myself. I would be very grateful if anybody could help me with this. Along i attach the chatting file.

Finished project could be found at :
finished-projects/java-chat-t644-20.html

java code

/*
 * PubChat.java
 *
 * Created on April 10, 2009, 9:19 PM
 */

package ClientSidePckg;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.text.*;
import java.util.List;
import java.util.*;

import javax.swing.filechooser.*;
import java.util.StringTokenizer;
import java.util.Vector;

import javax.swing.BoxLayout;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;


import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import static java.awt.event.KeyEvent.VK_ENTER;
import static java.awt.event.KeyEvent.VK_CONTROL;

 
public class PubChat extends javax.swing.JFrame implements ActionListener, 

KeyListener, Runnable {
    String clientName, serverName, clientGender, fromServer;
    String newUserName, newUserGender;
    Socket socket;
    PrintStream ps;
    BufferedReader br;
    Thread thread;
    StringTokenizer tokenizer;
    int totalUserCount;
    Vector userVector;
    StringBuffer sb;
    List<Integer> charsPressed;
    
    private static final Integer VK_ENTR = new Integer(VK_ENTER);
    private static final Integer VK_CTRL = new Integer(VK_CONTROL);    
    private static final JFileChooser fc = new JFileChooser();
    private static final String txt = ".txt";

    static {
        fc.setAcceptAllFileFilterUsed(true);
    }
    private String newline = System.getProperty("line.separator");

    /** Creates new Constructor PubChat */
    public PubChat(String name, String servername, String gender) {
        super("ChappyChat 1.1 Public Room for "+name);
        initComponents();      
        setResizable(false);
        setVisible(true);
        txtAreaSend.requestFocus();
        
            btnSend.addActionListener(this);
            btnPrivate.addActionListener(this);
            mnuItemDisconnect.addActionListener(this);
            mnuItemAbout.addActionListener(this);
            mnuItemLogin.addActionListener(this);
            mnuItemQuit.addActionListener(this);
            mnuItemSave.addActionListener(this);
            txtAreaSend.addKeyListener(this);
        
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent evt)
            {
                quitConnection("QUIT");
                System.exit(0);
            }
        });
        
        /*
        txtAreaSend.setDocument(new PlainDocument() {
            @Override
            public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
                if (str.equals(VK_CONTROL + "\n"))
                    super.insertString(offs, "\n", a);
                else if (!str.equals("\n"))
                    super.insertString(offs, str, a);
            }
        });
         * */
        
        charsPressed = new ArrayList<Integer>();
        
        clientName = name;
        serverName = servername;
        clientGender = gender;
        thread = new Thread(this);
        userVector = new Vector(1,1);
        try {
            socket = new Socket(serverName,9999);
            ps=new PrintStream(socket.getOutputStream());
            br=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            thread.start();
        }
        catch(IOException e) {
            msgPaneArea.setText("Connection to server failed. Make sure the server name is valid.");
        }
        sendMsgToServer("#HELO"+clientName+"~"+clientGender);
    }
    
    
    
    /** 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.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        lblInfo = new javax.swing.JLabel();
        jScrollPane2 = new javax.swing.JScrollPane();
        lstUser = new javax.swing.JList();
        btnPrivate = new javax.swing.JButton();
        btnSend = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        msgPaneArea = new javax.swing.JTextArea();
        jScrollPane3 = new javax.swing.JScrollPane();
        txtAreaSend = new javax.swing.JTextArea();
        jMenuBar1 = new javax.swing.JMenuBar();
        mnuFile = new javax.swing.JMenu();
        mnuItemLogin = new javax.swing.JMenuItem();
        mnuItemDisconnect = new javax.swing.JMenuItem();
        mnuItemSave = new javax.swing.JMenuItem();
        jSeparator1 = new javax.swing.JSeparator();
        mnuItemQuit = new javax.swing.JMenuItem();
        mnuAbout = new javax.swing.JMenu();
        mnuItemAbout = new javax.swing.JMenuItem();

        jLabel1.setText("jLabel1");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setIconImage(getIconImage());
        setResizable(false);
        getContentPane().setLayout(null);

        lblInfo.setBackground(new java.awt.Color(102, 51, 0));
        lblInfo.setFont(new java.awt.Font("Comic Sans MS", 1, 11));
        lblInfo.setForeground(new java.awt.Color(255, 255, 255));
        lblInfo.setOpaque(true);
        getContentPane().add(lblInfo);
        lblInfo.setBounds(0, 0, 690, 20);

        jScrollPane2.setViewportView(lstUser);

        getContentPane().add(jScrollPane2);
        jScrollPane2.setBounds(560, 20, 130, 390);

        btnPrivate.setText("Private");
        getContentPane().add(btnPrivate);
        btnPrivate.setBounds(560, 410, 130, 40);

        btnSend.setText("Send");
        btnSend.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSendActionPerformed(evt);
            }
        });
        getContentPane().add(btnSend);
        btnSend.setBounds(570, 470, 80, 50);

        msgPaneArea.setColumns(20);
        msgPaneArea.setEditable(false);
        msgPaneArea.setRows(5);
        jScrollPane1.setViewportView(msgPaneArea);

        getContentPane().add(jScrollPane1);
        jScrollPane1.setBounds(0, 20, 560, 430);

        txtAreaSend.setColumns(20);
        txtAreaSend.setRows(5);
        jScrollPane3.setViewportView(txtAreaSend);

        getContentPane().add(jScrollPane3);
        jScrollPane3.setBounds(0, 460, 550, 70);

        mnuFile.setText("File");

        mnuItemLogin.setText("Login");
        mnuItemLogin.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                mnuItemLoginActionPerformed(evt);
            }
        });
        mnuFile.add(mnuItemLogin);

        mnuItemDisconnect.setText("Disconnect");
        mnuItemDisconnect.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                mnuItemDisconnectActionPerformed(evt);
            }
        });
        mnuFile.add(mnuItemDisconnect);

        mnuItemSave.setText("Save");
        mnuFile.add(mnuItemSave);
        mnuFile.add(jSeparator1);

        mnuItemQuit.setLabel("Quit");
        mnuFile.add(mnuItemQuit);

        jMenuBar1.add(mnuFile);

        mnuAbout.setText("About");

        mnuItemAbout.setLabel("About ChappyChat 1.1");
        mnuAbout.add(mnuItemAbout);

        jMenuBar1.add(mnuAbout);

        setJMenuBar(jMenuBar1);

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-697)/2, (screenSize.height-597)/2, 697, 597);
    }// </editor-fold>//GEN-END:initComponents




    private void mnuItemDisconnectActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnuItemDisconnectActionPerformed
        // TODO add your handling code here:
}//GEN-LAST:event_mnuItemDisconnectActionPerformed

    private void btnSendActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnSendActionPerformed
        // TODO add your handling code here:
    }//GEN-LAST:event_btnSendActionPerformed

    private void mnuItemLoginActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mnuItemLoginActionPerformed
        // TODO add your handling code here:
    }//GEN-LAST:event_mnuItemLoginActionPerformed
    
    /**
     * @param args the command line arguments
     */
    
    public static void main(String args[]) {
        //java.awt.EventQueue.invokeLater(new Runnable() {
           // public void run() {
            //    new PubChat().setVisible(true);
          //  }
       // });
        //new PrivChat(clientName);
    } 
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton btnPrivate;
    private javax.swing.JButton btnSend;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JScrollPane jScrollPane3;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JLabel lblInfo;
    private javax.swing.JList lstUser;
    private javax.swing.JMenu mnuAbout;
    private javax.swing.JMenu mnuFile;
    private javax.swing.JMenuItem mnuItemAbout;
    private javax.swing.JMenuItem mnuItemDisconnect;
    private javax.swing.JMenuItem mnuItemLogin;
    private javax.swing.JMenuItem mnuItemQuit;
    private javax.swing.JMenuItem mnuItemSave;
    private javax.swing.JTextArea msgPaneArea;
    private javax.swing.JTextArea txtAreaSend;
    // End of variables declaration//GEN-END:variables

    
    
    public void actionPerformed(ActionEvent e) {
        Object button = e.getSource();
        if (button == mnuItemQuit) {
            quitConnection("QUIT");
            System.exit(0);
        }
        if (button == mnuItemDisconnect) {
            msgPaneArea.append("Connection to server has been disconnected...");
            quitConnection("QUIT");
        }
        if(button == mnuItemLogin) {
             quitConnection("QUIT");
             setVisible(false);
             new LoginChat();
        }
        if(button == mnuItemSave){
            SaveListener();
        }
        
        if(button == mnuItemAbout) {
            new About();
        }
        if(button == btnSend){
             sendMessage();
             txtAreaSend.setText("");
             txtAreaSend.requestFocus();
        }
        if(button == btnPrivate) {
             if(lstUser.getSelectedValue()== null)
             {
                 JOptionPane.showMessageDialog(null,"Select a user first!");
                 return;
             }
             if(lstUser.getSelectedValue().toString().equals(clientName))
             {
                 JOptionPane.showMessageDialog(null,"You can't select yourself!");
                 return;
             }
             sendPrivateMessage(txtAreaSend.getText(), lstUser.getSelectedValue().toString());
             txtAreaSend.setText("");
         }
    }
    protected void SentPrivateMessageToServer(String Message, String ToUserName) {
	sendMsgToServer("PRIV "+ToUserName+"~"+clientName+":"+Message);
        msgPaneArea.append(ToUserName + ":" + Message+"\n");
    }
    public void keyTyped(KeyEvent e) {}

    public void keyPressed(KeyEvent e) {
        
        if (e.getSource() == txtAreaSend) {
            charsPressed.add(e.getKeyCode());

            if (charsPressed.contains(VK_ENTER)) {
                if (charsPressed.contains(VK_CTRL))
                    txtAreaSend.append("\n");
                else {
                    sendMessage();
                    txtAreaSend.requestFocus();
                }
            }
        }     
         
        /*
        if(e.getKeyCode() != 10){
            //
        }
        else{
            if(e.isControlDown() && e.getKeyCode() == 10){
                String strBefore = txtAreaSend.getText();
                txtAreaSend.setText(strBefore+"\n");
            }
            else if (e.getKeyCode() == 10) {
                sendMessage();
                //msgPaneArea.append(txtAreaSend.getText());
                txtAreaSend.setText("");
                int caretPosition = txtAreaSend.getCaretPosition()-1;
                txtAreaSend.setCaretPosition(caretPosition);
            }
        }
         */
    }

    public void keyReleased(KeyEvent e) {
        
        if (e.getSource() == txtAreaSend) {

            if (charsPressed.contains(VK_ENTR) && !charsPressed.contains(VK_CTRL))
                txtAreaSend.setText("");

            for (ListIterator<? extends Integer> it = charsPressed.listIterator(); it.hasNext(); ) {
                Integer keyPressed = it.next();
                if (keyPressed.intValue() == e.getKeyCode()) it.remove();
            }
            
        }        
         
    }

    public void run() {
        while (thread != null){
            try {
                fromServer = br.readLine();
                if (fromServer.startsWith("ADD ")) {
                    totalUserCount++;
                    String newUser = fromServer.substring(4);
                    userVector.addElement(newUser);
                    lstUser.setListData(userVector);
                    msgPaneArea.append(newUser + " joins ChappyChat 1.1...\n");
                    updateInfo();
                }
                if (fromServer.startsWith("MESS")) {
                    String clientSender = fromServer.substring(4, fromServer.indexOf(":"));
                    String message = fromServer.substring(fromServer.indexOf(":")+1);
                    msgPaneArea.append(clientSender+": "+message+"\n");
                }
                if (fromServer.startsWith("KICK")) {
                    msgPaneArea.append("YOU'VE BEEN KICKED BY THE ADMINISTRATOR FOR FLOODING MESSAGE\n");
                    quitConnection("KICK");
                    thread = null;
                }
                if(fromServer.startsWith("LIST")) {
                    tokenizer = new StringTokenizer(fromServer.substring(5),";");
                    totalUserCount = tokenizer.countTokens();
                    while(tokenizer.hasMoreTokens())
                    {
                        userVector.addElement(tokenizer.nextToken());
                    }
                    lstUser.setListData(userVector);
                    msgPaneArea.append("Welcome to ChappyChat 1.1 \n");
                    updateInfo();
                }
                
                //ini perlu di rehab...kan buka jendela baru :-?
                if(fromServer.startsWith("PRIVA")) {
                    String clientSender = fromServer.substring(5,fromServer.indexOf(":"));
                    String message = fromServer.substring(fromServer.indexOf(":")+1);
                    msgPaneArea.append("Private message from "+clientSender+" : "+ message+"\n");
                }
                if(fromServer.startsWith("REMO")) {
                    String clientRemove = fromServer.substring(4);
                    msgPaneArea.append(clientRemove+" has logged out from ChappyChat 1.1\n");
                    totalUserCount--;
                    updateInfo();
                    userVector.remove(clientRemove);
                    lstUser.setListData(userVector);
                }
                if(fromServer.startsWith("INKI")) {
                    String clientKicked = fromServer.substring(4);
                    msgPaneArea.append(clientKicked+" has been kicked out form ChappyChat 1.1\n");
                    totalUserCount--;
                    updateInfo();
                    userVector.remove(clientKicked);
                    lstUser.setListData(userVector);
                }
                //perlu ga? soalnya kan uda ada di add :-?
                if(fromServer.startsWith("JOIN ")) {
                    msgPaneArea.append(fromServer.substring(5)+" joins ChappyChat1.1\n");
                    totalUserCount++;
                    userVector.addElement(fromServer.substring(5));
                    lstUser.setListData(userVector);
                    updateInfo();
                }
                if(fromServer.startsWith("DETA "))
                {
                   newUserName = fromServer.substring(5,fromServer.indexOf("~"));
                   newUserGender=fromServer.substring(fromServer.indexOf("~")+1);
                }
            }
            catch(IOException e) {}
        }
    }

    private void quitConnection(String tipe) {
        if(socket!=null)
        {
            try
            {
                if (tipe.equals("QUIT"))
                    sendMsgToServer("#QUIT"+clientName);
                if(tipe.equals("KICK"))
                    sendMsgToServer("#KICK"+clientName);
                socket.close();
                socket = null;
            }
            catch(IOException e) {}
        }
        if (thread!=null)
        {
            thread.stop();
            thread = null;
        }
    }

    private void sendMessage() {
         sendMsgToServer("#MESS"+clientName+":"+txtAreaSend.getText());
         msgPaneArea.append(clientName+":"+txtAreaSend.getText()+"\n");
    }

    private void sendMsgToServer(String msg) {
        ps.println(msg);
    }

    private void sendPrivateMessage(String msg, String toClient) {
        sendMsgToServer("#PRIV"+toClient+"~"+clientName + ":" + msg);
        msgPaneArea.append("(Private Chat With " + toClient + "): " + msg + "\n");
    }

    private void updateInfo() {
         sb = new StringBuffer();
         sb.append(totalUserCount);
         lblInfo.setText("Total User(s) : " + sb.toString());
    }
    


        protected Frame getFrame() {
            for (Container p = getParent(); p != null; p = p.getParent())
                if (p instanceof Frame)
                    return (Frame) p;
            return null;
        }
        
        
        public void SaveListener(){
            int returnVal = fc.showSaveDialog(this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                if (file.exists()) {
                    //default icon, custom title
                    int n = JOptionPane.showConfirmDialog(
                        getFrame(),
                        "File already exists. Would you like to override it?",
                        "Override File?",
                        JOptionPane.YES_NO_OPTION);

                    if (n == JOptionPane.NO_OPTION) {
                        //log.append("Save command cancelled by user. User do not wish to override it." + newline); //Display this command in the text area
                        JOptionPane.showMessageDialog(getFrame(),"Save command cancelled by user. User do not wish to override it.");
                        return;
                    }
                } //end of if (file.exists())
                boolean isAcceptedExtension = fc.accept(file);

                if (!isAcceptedExtension) {
                    //Custom button text
                    Object[] options = {"Yes, please",
                                        "No, thanks",
                                        "Don't do anything"};
                    int n = JOptionPane.showOptionDialog(getFrame(),
                        "The file name does not have '.txt' extension.\n\n"
                        + "Would you like the program to append '.txt' to the filename on behalf of you?\n\n"
                        + String.format("<html><body>Changing filename from 

<span style='font-family: monospace'><font color=#ff0000>'%s'</font> 

to <font color=#ff0000>'%s.txt'</font></span></body></html>\n", file.getPath(), file.getPath()),

                        "A Confirmation Question",
                        JOptionPane.YES_NO_CANCEL_OPTION,
                        JOptionPane.QUESTION_MESSAGE,
                        null,
                        options,
                        options[2]);


                    if (n == JOptionPane.YES_OPTION) {
                        file = makeTxt(file);
                        isAcceptedExtension = true;
                    }
                } //end of if (!isAcceptedExtension)                
                if (isAcceptedExtension) {
                    Thread saver = new FileSaver(file, msgPaneArea.getDocument());
                    saver.start();

                    //log.append("Saving: " + file.getName() + "." + newline); //Display "Saving" and the retrieved file name in the text area
                    JOptionPane.showMessageDialog(getFrame(),"Saving : " + file.getName() + ".");
                } else
                    //log.append("Saving Failed: " + file.getName() + " does not END with (.txt)." + newline); 
//Display "Saving" and the retrieved file name in the text area
                    JOptionPane.showMessageDialog(getFrame(),"Saving Failed....");
            } else
                txtAreaSend.append("Save command cancelled by user." + newline); //Display this command in the text area                
        }

   
/**
     * Thread to save a document to file
     */




        /**
         * Changed the extension to .txt if it has not done.
         *
         * @param f file to be changed.
         * @return File that has been changed.
         */
    private File makeTxt(File f) {
         return (f.getName().endsWith(txt)) ? f : new File(f.getName().concat(txt));
    }        
    class FileSaver extends Thread {
        private Document doc;
        private File f;
        private static final String txt = ".txt";


        FileSaver(File f, Document doc) {
            setPriority(4);
            this.f = makeTxt(f);
            this.doc = doc;
        }
        
        @Override
        public void run() {
            JComponent status = new JPanel();
            JFrame frame = new JFrame("Saving...");
            try {

                // initialize the statusbar
                status.removeAll();
                JProgressBar progress = new JProgressBar();
                progress.setMinimum(0);
                progress.setMaximum((int) doc.getLength());
                status.add(progress);
                status.revalidate();

                Container c = frame.getContentPane();
                c.setLayout(new BoxLayout(c, BoxLayout.PAGE_AXIS));
                c.add(status);
                c.add(new JLabel(String.format("Saving file '%s' in '%s'", f.getName(), f.getPath())));
                c.add(new JLabel("Please wait..."));

                frame.pack();
                frame.setVisible(true);
                halt(2000);

                // start writing
                Writer out = new FileWriter(f);
                Segment text = new Segment();
                text.setPartialReturn(true);
                int charsLeft = doc.getLength();
                int offset = 0;
                while (charsLeft > 0) {
                    doc.getText(offset, Math.min(4096, charsLeft), text);
                    out.write(text.array, text.offset, text.count);
                    charsLeft -= text.count;
                    offset += text.count;
                    progress.setValue(offset);
                    halt(10);
                }
                out.flush();
                out.close();
            } catch (IOException e) {
                final String msg = e.getMessage();
                SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                        JOptionPane.showMessageDialog(getFrame(),
                                "Could not save file: " + msg,
                                "Error saving file",
                                JOptionPane.ERROR_MESSAGE);
                    }
                });
            } catch (BadLocationException e) {
                System.err.println(e.getMessage());
            }
            // we are done... get rid of progressbar
            status.removeAll();
            status.revalidate();
            halt(2000);
            frame.setVisible(false);
        }
    } // end of class FileSaver
        private static final void halt(int ms) {
        try {
            Thread.sleep(ms);
        } catch (InterruptedException exception) {
            System.err.println("Thread had been interrupted...");
        }
    }
} // end of class PubChat