Java : BufferedImage to Bitmap format

When you say "into Bitmap format" you then mean the data (as in a byte array)? If that's the case, then you can use ImageIO.write (like suggested above).
If you don't want to save it to a file, but just want to get the data, can you use a ByteArrayOutputStream like this:

ByteArrayOutputStream out = new ByteArrayOutputStream();
ImageIO.write(img, "BMP", out);
byte[] result = out.toByteArray();

To see the image types available for write in the J2SE (ex. JAI), see ImageIO.getWriterFileSuffixes():

E.G.

class ShowJavaImageTypes {

    public static void main(String[] args) {
        String[] imageTypes =
            javax.imageio.ImageIO.getWriterFileSuffixes();
        for (String imageType : imageTypes) {
            System.out.println(imageType);
        }
    }
}

Output

For this Sun Java 6 JRE on Windows 7.

bmp
jpg
wbmp
jpeg
png
gif
Press any key to continue . . .

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See similar ImageIO methods for MIME types, formats, and the corresponding readers.

You need to have a look at ImageIO.write.

• The Java Tutorials: Writing/Saving an Image

If you want the result in the form of a byte[] array, you should use a ByteArrayOutputStream:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(yourImage, "bmp", baos);
baos.flush();
byte[] bytes = baos.toByteArray();
baos.close();