java print screen two monitors

Question

I'm trying to use print screen image area to get 2 monitors, but only works for one monitor. Can you advise me how to get figure 2 monitors?

        Robot robot = new Robot();    
        Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
        BufferedImage capture = new Robot().createScreenCapture(screenRect);
        ImageIO.write(capture, "bmp", new File("printscreen.bmp"));

Answer 1

This is the code I have used and tested , it works , it creates two png files inside the res folder(change it to your folder) one for my primary and the other for the secondary screen . i had also printed the Bounds information about the Displays , if you want both displays in one image , just add the width of both monitors and you will have it

public static void screenMultipleMonitors() {
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice[] gDevs = ge.getScreenDevices();

    for (GraphicsDevice gDev : gDevs) {
        DisplayMode mode = gDev.getDisplayMode();
        Rectangle bounds = gDev.getDefaultConfiguration().getBounds();
        System.out.println(gDev.getIDstring());
        System.out.println("Min : (" + bounds.getMinX() + "," + bounds.getMinY() + ") ;Max : (" + bounds.getMaxX()
                + "," + bounds.getMaxY() + ")");
        System.out.println("Width : " + mode.getWidth() + " ; Height :" + mode.getHeight());

        try {
            Robot robot = new Robot();

            BufferedImage image = robot.createScreenCapture(new Rectangle((int) bounds.getMinX(),
                    (int) bounds.getMinY(), (int) bounds.getWidth(), (int) bounds.getHeight()));
            ImageIO.write(image, "png",
                    new File("src/res/screen_" + gDev.getIDstring().replace("\\", "") + ".png"));

        } catch (AWTException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

Answer 2

Union together the bounds of each screen:

Rectangle screenRect = new Rectangle(0, 0, 0, 0);
for (GraphicsDevice gd : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()) {
    screenRect = screenRect.union(gd.getDefaultConfiguration().getBounds());
}
BufferedImage capture = new Robot().createScreenCapture(screenRect);