How to convert image icon in jlabel to byte without using filechooser

Question

I'm just new at java development, i can insert image into database by using file chooser and then convert to byte,the problem is i want to save a default image into database without using file chooser.I set the label with a specific image through properties.Can i convert the default image i set to label?

any help will be appreciated.

Answer 1

Yes, it's possible. You need to convert the Icon from the JLabel to BufferedImage, from there you can simply pass it through the ImageIO API to get a byte[] array

Icon icon = null;
BufferedImage img = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
icon.paintIcon(null, g2d, 0, 0);
g2d.dispose();

try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
    ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
    try {
        ImageIO.write(img, "png", ios);
        // Set a flag to indicate that the write was successful
    } finally {
        ios.close();
    }
    byte[] bytes = baos.toByteArray();
} catch (IOException ex) {
    ex.printStackTrace();
}