import java.awt.Desktop;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
 
import javax.imageio.ImageIO;
public class CaptureScreen {
  
    public static void captureScreen(String fileName, String folder) throws Exception {
  
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Rectangle screenRectangle = new Rectangle(screenSize);
        Robot robot = new Robot();
        BufferedImage image = robot.createScreenCapture(screenRectangle);
        //儲存路徑
        File screenFile = new File(fileName);
        if (!screenFile.exists()) {
            screenFile.mkdir();
        }
        File f = new File(screenFile, folder);
          
        ImageIO.write(image, "png", f);
        //自動開啟
        if (Desktop.isDesktopSupported()
                 && Desktop.getDesktop().isSupported(Desktop.Action.OPEN))
                    Desktop.getDesktop().open(f);
    }
  
    public static void main(String[] args) {
        try {
            captureScreen("/Users/sun/Documents","1.png");
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
  
}