Try this:
Icon icon = FileSystemView.getFileSystemView().getSystemIcon(getFile());
int width = icon.getIconWidth();
int height = icon.getIconHeight();
BufferedImage img = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
icon.paintIcon(null, g, 0, 0);
try {
ImageIO.write(img, "jpg", new File("c:/1.jpg"));
} catch (IOException e) {
// Make it silent here.
}
