通過java.awt.Robot的createScreenCapture截取屏幕

通過java.awt.Robot的createScreenCapture截屏.

　public static void captureScreen(String fileName) throws Exception {

　　　 Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
　　　 Rectangle screenRectangle = new Rectangle(screenSize);
　　　 Robot robot = new Robot();
　　　 BufferedImage image = robot.createScreenCapture(screenRectangle);
　　　 ImageIO.write(image, "png", new File(fileName));
}