Capture image of componen

"Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this>
Wed, 27 Apr 2011 15:51:05 GMT
Capture image of component

I put this little code example up at SDNShare to answer
a question on the Sun forums. Since it is so cute, I
thought I'd reproduce it here*.

* c.l.j.g. & h, w/ f-u set to c.l.j.h. only. Set the follow-ups
as you see fit.

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Image;
import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.InputEvent;

import javax.swing.*;

import javax.swing.border.TitledBorder;

import javax.imageio.ImageIO;


Create a screenshot of a component.
@author Andrew Thompson
class ComponentImageCapture {

  static final String HELP =
    "Type Ctrl-0 to get a screenshot of the current GUI.\n" +
    "The screenshot will be saved to the current " +
    "directory as 'screenshot.png'.";

  public static BufferedImage getScreenShot(
    Component component) {

    BufferedImage image = new BufferedImage(
    // call the Component's paint method, using
    // the Graphics object of the image.
    component.paint( image.getGraphics() );
    return image;

  public static void main(String[] args) {
    Runnable r = new Runnable() {
      public void run() {
        final JFrame f = new JFrame("Test Screenshot");

        JMenuItem screenshot =
          new JMenuItem("Screenshot");
          new ActionListener(){
            public void actionPerformed(ActionEvent ae) {
              BufferedImage img = getScreenShot(
                f.getContentPane() );
                new JLabel(
                  new ImageIcon(
                      Image.SCALE_SMOOTH )
              try {
                // write the image as a PNG
                  new File("screenshot.png"));
              } catch(Exception e) {
          } );
        JMenu menu = new JMenu("Other");
        JMenuBar mb = new JMenuBar();

        JPanel p = new JPanel( new BorderLayout(5,5) );
        p.setBorder( new TitledBorder("Main GUI") );
        p.add( new JScrollPane(new JTree()),
          BorderLayout.WEST );
        p.add( new JScrollPane( new JTextArea(HELP,10,30) ),
          BorderLayout.CENTER );

        f.setContentPane( p );

Andrew Thompson

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