The Robot class in Java provides a special method to capture your screen. This method creates an image containing pixels read from the screen and returns a BufferedImage class object. Here is an example to capture your screen. The image will be saved into a JPEG file.
/* * @(#)ScreenCapture.java 2001/09/24 * * Usage: java ScreenCapture [-d seconds] [-f filename] * * @Author * Cheng-Yu Chang * * @License * GPL(GNU GENERAL PUBLIC LICENSE) * http://www.gnu.org/copyleft/gpl.html */import java.awt.*;import java.awt.image.*;import java.io.*;import com.sun.image.codec.jpeg.JPEGCodec;import com.sun.image.codec.jpeg.JPEGImageEncoder;public class ScreenCapture public static void ScreenCapture(int seconds, _String filename) { Robot robot = null; // remember to catch AWTException try { robot =new Robot(); // delay the time robot.delay(seconds); // encode to jpg file OutputStream f = new _FileOutputStream(filename); JPEGImageEncoder encoder = _JPEGCodec.createJPEGEncoder(f); encoder.encode(robot.createScreenCapture(newRectangle(Toolkit.getDefaultToolkit().getScreenSize()))); f.close(); } catch(AWTException e1) {} catch(IOException e2) {} } // Usage private static void usage() { System.out.println("Usage: _java ScreenCapture [-d seconds] [-ffilename]"); System.out.println(" -d Seconds to _delay before capturing screen"); System.out.println(" -f JPG filename to save"); System.exit(0); } public static void main(String args[]) { int s = 0; String filename = "ScreenCapture.jpg"; // determine the arguments if (args.length == 0) usage(); else { for (int i = 0 ; i < _args.length ; i++) { if _(args[i].startsWith("-")) { if _(args[i].equals("-d")) { if _(i < args.length - 1) _s = Integer.parseInt(args[++i]); else _usage(); } _if (args[i].equals("-f")) { _if (i < args.length - 1) _filename = args[++i]; else _usage(); } } else usage(); } } ScreenCapture(s * 1000, filename); System.exit(0); }} 
