How to inject Java applet's getGraphics() method?

First what I want to say is that this is my favorite help site for Java. (and other languages)

Now my question is, I want to take a screenshot of a Java applet.

I have load the applet via the java.net.URLClassLoader and added it to my JFrame.

I开发者_运维百科 can see it in my JFrame but I want to render it to a screenshot.

The solution for NORMAL applets is mentioned here: Taking a "screenshot" of a java applet

But this Applet doesn't use the paint nor update method, instead it uses the getGraphics() method.

I have already injected the AppletStub so the applets thinks he is on his own website.

But how can I inject the applet its getGraphics() method to render it to a screenshot?

BTW, this is my code:

@Override
public void actionPerformed(final ActionEvent e) {
    final String s = e.getActionCommand();
    if (s.equals("Screenshot")) {
        final BufferedImage offScreen = new BufferedImage(800, 600, BufferedImage.TYPE_INT_RGB);
        Loader.getApplet().update(offScreen.createGraphics());
        try {
            ImageIO.write(offScreen, "PNG", new File("C:/Users/Mitchell/Pictures/screenshot.png"));
        } catch (Exception ex) {  }
    }
}

All it creates is a black 800x600 png image (the empty BufferedImage).

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If you can get away with it, create a subclass of the Applet in question, and override getGraphics() such that it will return your Graphics object, then use the subclass instead of the original.