コンポーネントの画像キャプチャをしてファイルに保存する

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;

/**
* $Id: SavingImageOfComponent.html,v 1.1 2009/06/22 16:11:56 kishi Exp kishi $
*/

public class SavingImageOfComponent {

    public static void main( String[] args ) {

        JFrame f = new JFrame( "SavingImageOfComponent" );

        Container container = f.getContentPane();

        JTextArea ta1 = new JTextArea();
        ta1.setBackground( Color.cyan );

        JTextArea ta2 = new JTextArea();
        ta2.setBackground( Color.white );
        ta2.setText( "コンポーネントの画像キャプチャをしてファイルに保存します" );

        final Component comp = container.add( new JSplitPane( JSplitPane.HORIZONTAL_SPLIT,
                                              new JScrollPane( ta1 ),
                                              new JScrollPane( ta2 ) ) );

        JPanel southPanel = new JPanel();
        southPanel.setBackground( Color.black );

        container.add( southPanel, BorderLayout.SOUTH );
        JButton save = ( JButton ) southPanel.add( new JButton( "コンポーネントの画像を保存" ) );

        save.addActionListener( new ActionListener() {
                                    public void actionPerformed( ActionEvent evt ) {
                                        try {
                                            int w = comp.getWidth(), h = comp.getHeight();

                                            BufferedImage image = new BufferedImage( w, h,
                                                                  BufferedImage.TYPE_INT_RGB );

                                            Graphics2D g2 = image.createGraphics();
                                            comp.paint( g2 );
                                            g2.dispose();

                                            ImageIO.write( image, "jpeg", new File( "savedImage.jpeg" ) );

                                        } catch ( IOException e ) {
                                            System.err.println( e );
                                        }
                                    }
                                }
                              );

        f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        f.setSize( 400, 400 );
        f.setVisible( true );
    }
}