Writing Image files from Applet to Servlet

Question

How to write ImageFiles from an Applet to a Servlet?
I draw a image on a JComponent in Applet and wanted to save the image file in the server.
I am unable to write an Image Object to the Servlet as the BufferedImage class is not serialized.
I tried writing the image to the Servlet output stream and tried reading the data in the servlet and writing the data to a jpg file.
But the files is not being written as proper jpeg file.
Any help would be great.
Thanks,
Sridhar.

Answer 1

I get the following exception below when i try to write a Serialized object from an applet to the servlet.
I copied the serialized class jar file to the tomcat webserver lib folder.
The serialized class has a BufferedImage object.
Serialized Class Code
public class SerializedImage implements Serializable{
     private BufferedImage im = null;
     public SerializedImage() {
          super();
     public BufferedImage getSerializedObject() {
          return im;
     public void setSerializedObject((BufferedImage im) {
          this.im = im;
     private BufferedImage fromByteArray(byte[] imagebytes) {
          try {
               if (imagebytes != null && (imagebytes.length > 0)) {
                    BufferedImage im = ImageIO.read(new ByteArrayInputStream(imagebytes));
                    return im;
               return null;
          } catch (IOException e) {
               throw new IllegalArgumentException(e.toString());
     private byte[] toByteArray(BufferedImage o) {
          if(o != null) {
               BufferedImage image = (BufferedImage)o;
               ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
               try {
                    ImageIO.write(image, "jpg", baos);
               } catch (IOException e) {
                    throw new IllegalStateException(e.toString());
               byte[] b = baos.toByteArray();
               return b;
          return new byte[0];
     private void writeObject(java.io.ObjectOutputStream out)
     throws IOException {
          byte[] b = toByteArray(im);
          out.writeInt(b.length);
          out.write(b);
     private void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException {
          int length = in.readInt();
          byte[] b = new byte[length];
          in.read(b);
          im = fromByteArray(b);
Exception :
java.io.StreamCorruptedException: unexpected block data
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1288)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:18
45)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
Is there any thing that i am missing or doing wrong?
Thanks,
Sridhar.