Foro de elhacker.net

public class GlobalKeyListenerExample implements NativeKeyListener {
        public void nativeKeyPressed(NativeKeyEvent e) {
                System.out.println("Key Pressed: " + NativeKeyEvent.getKeyText(e.getKeyCode()));

                if (e.getKeyCode() == NativeKeyEvent.VK_ESCAPE) {
                        GlobalScreen.unregisterNativeHook();
                }
        }

        public void nativeKeyReleased(NativeKeyEvent e) {
                System.out.println("Key Released: " + NativeKeyEvent.getKeyText(e.getKeyCode()));
        }

        public void nativeKeyTyped(NativeKeyEvent e) {
                System.out.println("Key Typed: " + e.getKeyText(e.getKeyCode()));
        }

        public static void main(String[] args) {
                try {
                        GlobalScreen.registerNativeHook();
                }
                catch (NativeHookException ex) {
                        System.err.println("There was a problem registering the native hook.");
                        System.err.println(ex.getMessage());

                        System.exit(1);
                }

                //Construct the example object and initialze native hook.
                GlobalScreen.getInstance().addNativeKeyListener(new GlobalKeyListenerExample());
        }
}