New Image saving problem

Question

Hi,
I have to write some things to a servlet (extends HttpServlet) as well as to draw images and save as gif to be displayed in the servlet.
I have accomplished up to generating a file, but the file is 0kb. Can anyone give me a suggestion?
These are the methods I am using:
public  static void saveGIF(OutputStream os) throws IOException {
       //Create an image to save
       int w = 100;
       int h = 100;
       BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
       Graphics2D g2 = image.createGraphics();
       g2.setPaint(Color.BLUE);
        g2.fillOval(0, 0, w, h);
       g2.dispose();
       ImageIO.write(image, "gif", new File("rect.gif"));
       display(image);
static void display(BufferedImage im) {
        JFrame f = new JFrame("Image");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JLabel(new ImageIcon(im)));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
     I have declared OutputStream ops;And I am calling saveGIF(ops) in the doGet method of the servlet.
Any suggestions or feedback is welcome.
Thank you.

Answer 1

Firstly, Erik44's post is wrong, your buffered image is ok.
Do you know that:
ImageIO.write(image, "gif", new File("rect.gif"));returns a boolean which is "false if no appropriate writer is found." Hmmmm. Add did you know the the jdk
is shipped with a reader but no writer for GIF format. Hmmmmm. Try jpeg or png format:
booleam writerFound = ImageIO.write(image, "jpeg", new File("rect.jpeg"));
if (!writerFound) {
}