正如@Hovercraft指出的那样。
您将需要知道鼠标光标在哪里，虽然没有“简单”的方式来跟踪光标，但是您可以使用以下方法获取它的当前位置MouseInfo#getPointerInfo
这只是这个概念的小例子。这基于鼠标光标的运动。一个可能的增强功能是当光标下的颜色也发生变化时也通知监视器侦听器。
public class WhatsMyColor {
public static void main(String[] args) throws IOException {
new WhatsMyColor();
}
public WhatsMyColor() {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (illegalaccessexception ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
try {
JFrame frame = new JFrame();
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new MouseColorPane());
frame.setSize(400, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (Exception exp) {
exp.printStackTrace();
}
}
});
}
public class MouseColorPane extends JPanel implements MouseMonitorListener {
private Robot robot;
private JLabel label;
public MouseColorPane() throws AWTException {
label = new JLabel();
setLayout(new GridBagLayout());
add(label);
robot = new Robot();
PointerInfo pi = MouseInfo.getPointerInfo();
updateColor(pi.getLocation());
MouseMonitor monitor = new MouseMonitor();
monitor.setMouseMonitorListener(this);
monitor.start();
}
protected void updateColor(Point p) {
Color pixelColor = robot.getPixelColor(p.x, p.y);
setBackground(pixelColor);
label.setText(p.x + "x" + p.y + " = " + pixelColor);
}
@Override
public void mousePositionChanged(final Point p) {
SwingUtilities.invokelater(new Runnable() {
@Override
public void run() {
updateColor(p);
}
});
}
}
public interface MouseMonitorListener {
public void mousePositionChanged(Point p);
}
public static class MouseMonitor extends Thread {
private Point lastPoint;
private MouseMonitorListener listener;
public MouseMonitor() {
setDaemon(true);
setPriority(MIN_PRIORITY);
}
public void setMouseMonitorListener(MouseMonitorListener listener) {
this.listener = listener;
}
public MouseMonitorListener getMouseMonitorListener() {
return listener;
}
protected Point getMouseCursorPoint() {
PointerInfo pi = MouseInfo.getPointerInfo();
return pi.getLocation();
}
@Override
public void run() {
lastPoint = getMouseCursorPoint();
while (true) {
try {
sleep(250);
} catch (InterruptedException ex) {
}
Point currentPoint = getMouseCursorPoint();
if (!currentPoint.equals(lastPoint)) {
lastPoint = currentPoint;
MouseMonitorListener listener = getMouseMonitorListener();
if (listener != null) {
listener.mousePositionChanged((Point) lastPoint.clone());
}
}
}
}
}
}
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