How to save an image as a jpeg

Question

If i have an image now
Image finalImg = toolkit.createImage(source);
How can i save it as a jpeg?
A friend told me to use use classes from com.sun.image.codec.jpeg
because i am very new to Java, i do not quite understand this codec.jpeg, please help

Answer 1

That's ancient, use package javax.imageio -- I little dab'll do yah.
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
public class HelloJPEG {
    static final boolean ANTIALIASING = true;
    static final boolean FRACTION_METRICS = false;
    static final int SIZE = 96;
    public static void main(String[] args) throws IOException {
        String text = args.length > 0 ? args[0] : "Hello, World";
        Font font = new Font("Lucida Bright", Font.PLAIN, SIZE);
        FontRenderContext frc = new FontRenderContext(null, ANTIALIASING, FRACTION_METRICS);
        Rectangle2D bounds = font.getStringBounds(text, frc);
        int w = (int) Math.ceil(bounds.getWidth());
        int h = (int) Math.ceil(bounds.getHeight());
        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = image.createGraphics();
        g.setFont(font);
        Object taHint = ANTIALIASING ?
            RenderingHints.VALUE_ANTIALIAS_ON : RenderingHints.VALUE_ANTIALIAS_OFF;
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, taHint);
        Object fmHint = FRACTION_METRICS ?
            RenderingHints.VALUE_FRACTIONALMETRICS_ON : RenderingHints.VALUE_FRACTIONALMETRICS_OFF;
        g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, fmHint);
        g.setColor(Color.GREEN); //for St. Paddy
        g.drawString(text, -(float) bounds.getX(), - (float) bounds.getY());
        g.dispose();
        ImageIO.write(image, "jpeg", new File("hello.jpg"));
}A good source of all things Java2D is Chet Haase: http://weblogs.java.net/blog/chet/