How to send a bufferedImage Object

Question

m trying to send bufferedImage from one computer to another via TCP/IP socket using following code...
ObjectOutputStream writer = new ObjectOutputStream(socket.getOutputStream());
writer.writeObject(<bufferedImage-Object>);
writer.flush();
but it gives an exception saying something it is not serializable.
Can somebody suggest a way to send the object?
Regards
Deewa

Answer 1

Hello there!
Have a look at this:
//The Server
import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.awt.image.*;
import java.awt.event.*;
import java.net.*;
* TheServer.java
* Created on 29. Juli 2003, 11:19
* @author  Darimont
public class TheServer extends javax.swing.JFrame {
    private ServerSocket ss = null;
    private Socket s = null;
    private Thread serverThread = null;
    private BufferedImage bimg = null;
    private int[] pixarray = null;
    private PixelGrabber pg = null;
    /** Creates new form TheServer */
    public TheServer() {
        initComponents();
        loadImage();
    private void startServer(){
        if(serverThread == null){
            serverThread = new Thread(new myServer());
            serverThread.start();
    private void loadImage(){
        MediaTracker mt = new MediaTracker(this);
        try{
            bimg = javax.imageio.ImageIO.read(new File("c:/Beispiel1.jpg"));
        }catch(IOException ioe){
            ioe.printStackTrace();
        mt.addImage(bimg,0);
        try{
            mt.waitForAll();
        }catch(InterruptedException ie){
            ie.printStackTrace();
        mt = null;
        //Imagepixels to Array -->
        //My Imagesize is 100 x 100 Pixels so there are 10000 Pixels
        pixarray = new int[10000];
        pg = new PixelGrabber((Image)bimg,0,0,bimg.getWidth(),bimg.getHeight(),pixarray,0, 100);
        try{
            pg.grabPixels();
        }catch(InterruptedException ie){ie.printStackTrace();}
    /** 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.
    private void initComponents() {
        java.awt.GridBagConstraints gridBagConstraints;
        jPanel1 = new javax.swing.JPanel();
        jPanel2 = new javax.swing.JPanel();
        jButton2 = new javax.swing.JButton();
        getContentPane().setLayout(new java.awt.GridBagLayout());
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        jPanel1.setMinimumSize(new java.awt.Dimension(400, 300));
        jPanel1.setPreferredSize(new java.awt.Dimension(400, 300));
        getContentPane().add(jPanel1, new java.awt.GridBagConstraints());
        jPanel2.setMinimumSize(new java.awt.Dimension(400, 50));
        jPanel2.setPreferredSize(new java.awt.Dimension(400, 50));
        jButton2.setText("Start Server");
        jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                jButton2MousePressed(evt);
        jPanel2.add(jButton2);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        getContentPane().add(jPanel2, gridBagConstraints);
        pack();
    private void jButton2MousePressed(java.awt.event.MouseEvent evt) {
        // Add your handling code here:
        startServer();
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    public void paint(Graphics g){
        super.paint(g);
        if(bimg !=null)
            jPanel1.getGraphics().drawImage(bimg.getScaledInstance(bimg.getWidth(),bimg.getHeight(),Image.SCALE_FAST),0,0,bimg.getWidth(),bimg.getHeight(),this);
     * @param args the command line arguments
    public static void main(String args[]) {
        new TheServer().show();
    class myServer implements Runnable{
        ObjectOutputStream oos = null;
        public void run() {
            try{
                ss = new ServerSocket(8888);
                System.out.println("Server started!");
                while((s=ss.accept())==null)
                    Thread.currentThread().sleep(100);
                System.out.println("Connected");
                BufferedOutputStream bos = new BufferedOutputStream(s.getOutputStream());
                oos = new ObjectOutputStream(bos);
                oos.writeObject(pixarray);
                oos.close();
                s.close();
                s= null;
                ss.close();
                ss = null;
                System.out.println("Connection closed");
            }catch(IOException ioe){ ioe.printStackTrace();
            }catch(InterruptedException ie) { ie.printStackTrace();
            } //catch(SocketException se){ se.printStackTrace(); }
    // Variables declaration - do not modify
    private javax.swing.JButton jButton2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    // End of variables declaration
}// The Client
import java.awt.*;
import java.net.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.image.*;
* TheClient.java
* Created on 29. Juli 2003, 12:08
* @author  Darimont
public class TheClient extends javax.swing.JFrame {
    private Image img = null;
    private Socket s = null;
    private int[] imga = null;
    private Thread clientThread  = null;
    /** Creates new form TheClient */
    public TheClient() {
        initComponents();
    public void start(){
        if(clientThread ==null){
            clientThread = new Thread(new theClient());
            clientThread.start();
    /** 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.
    private void initComponents() {
        java.awt.GridBagConstraints gridBagConstraints;
        jPanel1 = new javax.swing.JPanel();
        jPanel2 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        getContentPane().setLayout(new java.awt.GridBagLayout());
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        jPanel1.setMinimumSize(new java.awt.Dimension(400, 250));
        jPanel1.setPreferredSize(new java.awt.Dimension(400, 250));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        getContentPane().add(jPanel1, gridBagConstraints);
        jPanel2.setMinimumSize(new java.awt.Dimension(400, 50));
        jPanel2.setPreferredSize(new java.awt.Dimension(400, 50));
        jButton1.setText("Get Image");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                jButton1MousePressed(evt);
        jPanel2.add(jButton1);
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        getContentPane().add(jPanel2, gridBagConstraints);
        pack();
    private void jButton1MousePressed(java.awt.event.MouseEvent evt) {
        // Add your handling code here:
        start();
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // Add your handling code here:
    public void paint(Graphics g){
        super.paint(g);
        if(img!=null)
            jPanel1.getGraphics().drawImage(img,0,0,img.getWidth(null),img.getHeight(null),this);
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
     * @param args the command line arguments
    public static void main(String args[]) {
        new TheClient().show();
    private void resampleImage(int[] imageArray){
        img = createImage(new MemoryImageSource(100,100,imageArray,0,100));
    class theClient implements Runnable{
        ObjectInputStream ois = null;
        BufferedInputStream bis = null;
        public void run() {
            try{
                s = new Socket("localhost",8888);
                if(s != null){
                    bis = new BufferedInputStream(s.getInputStream());
                    ois = new ObjectInputStream(bis);
                    imga = (int[])ois.readObject();
                    if (imga != null){
                        resampleImage(imga);
                        jPanel1.getGraphics().drawImage(img,0,0,img.getWidth(null),img.getHeight(null),jPanel1);
            }catch(IOException ioe){ ioe.printStackTrace();
            }catch(ClassNotFoundException cnfe){ cnfe.printStackTrace();
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    // End of variables declaration
}Have a nice day!
bye Tom