Help with saving an image - Urgent!

Question

Hi,
I have an application that opens an image and modifies it, but how do I save the modified version? I have been searching the web, and I just get more and more confused - what's the easiest way to do this? I don't really understand much of what I have been reading... :(
At the moment my application saves, but it saves as text. Is it easy to modify this to save as jpg?
Here is my save and open code:
void open_actionPerformed(ActionEvent e) {
int status = chooser.showOpenDialog(this);
if (status == JFileChooser.APPROVE_OPTION) {
File file = chooser.getSelectedFile();
String filename = file.getAbsolutePath();
ImageIcon icon = new ImageIcon(filename);
jLabel1.setIcon(icon);
long length = file.length();
String name = file.getName();
jLabel1.setToolTipText(length + "bytes, " + name);
titledBorder1.setTitle(name);
statusBar.setText(filename);
void save_actionPerformed(ActionEvent e) {
int status = chooser.showSaveDialog(this);
if (status == JFileChooser.APPROVE_OPTION) {
File file = chooser.getSelectedFile();
String filename = file.getAbsolutePath();
ImageIcon icon = new ImageIcon(filename);
try {
FileOutputStream fos = new FileOutputStream(file);
String text = statusBar.getText();
byte data[] = text.getBytes();
fos.write(data);
} catch (IOException ex) {
System.err.println("Error while writing");
Grateful for all comments!!!

Answer 1

The following works, but only if you have the package. The comments in com/sun/image/codec/jpeg/JPEGCodec.java say:
Note that the classes in the com.sun.image.codec.jpeg package are not
part of the core Java APIs. They are a part of Sun's JDK and JRE
distributions. Although other licensees may choose to distribute
these classes, developers cannot depend on their availability in
non-Sun implementations. We expect that equivalent functionality
will eventually be available in a core API or standard extension.So if you want to distribute your program, the user can't be sure if it runs on his platform.
import java.io.*;
import com.sun.image.codec.jpeg.*;
     File saveTarget=new File(filename);
     FileOutputStream fos=new FileOutputStream(saveTarget);
     JPEGImageEncoder enc=JPEGCodec.createJPEGEncoder(fos,
       JPEGCodec.getDefaultJPEGEncodeParam(imageToSave)
     enc.encode(imageToSave);
     fos.close();