Making jpg or png images in Java...

Question

Hello everyone,
Can anyone please post a simple class that simply does the following:
//Create some sort of image
Graphics g = image.getGraphics();
g.fillRect(...);
//Export the image to a jpg file: e.g. a.jpg/a.png
Thank you

Answer 1

import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class Imaging {
    public static void main(String[] args) throws IOException {
        BufferedImage image = getImage(200, 200);
        // jpg, png, bmp (j2se 1.5), gif (j2se 1.6)
        String fileName = "imaging.jpg";
        saveImage(image, fileName);
        showImage(fileName);
    private static BufferedImage getImage(int w, int h) {
        int type = BufferedImage.TYPE_INT_RGB;
        BufferedImage image = new BufferedImage(w, h, type);
        Graphics2D g2 = image.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setPaint(new GradientPaint(0,0,Color.red,w,h,Color.orange));
        g2.fillRect(0,0,w,h);
        g2.setPaint(Color.cyan);
        double d = Math.min(w, h)/4;
        g2.fill(new Ellipse2D.Double(w/2-d/2, h/2-d/2, d, d));
        g2.dispose();
        return image;
    private static void saveImage(BufferedImage image, String fileName)
                                          throws IOException {
        File file = new File(fileName);
        int dot = fileName.lastIndexOf(".");
        String ext = fileName.substring(dot+1);
        ImageIO.write(image, ext, file);
    private static void showImage(String fileName) throws IOException {
        BufferedImage image = ImageIO.read(new File(fileName));
        JOptionPane.showMessageDialog(null, new ImageIcon(image),
                                      fileName, JOptionPane.PLAIN_MESSAGE);
}