java实现透明窗体

import java.awt.Dimension; import java.awt.Graphics; import java.awt.Image; import java.awt.Point; import java.awt.Rectangle; import java.awt.Robot; import java.awt.Toolkit; import javax.swing.JFrame; import javax.swing.JPanel; /** * 实现透明窗体 * @author Administrator * */ public final class Test extends JFrame { JPanel jp; Image Background; Point p0; Point p1; public Test() { jp = new JPanel(); this.getContentPane().add(jp); // 获取整个屏幕图像 try { Robot r = new Robot(); Toolkit tk = Toolkit.getDefaultToolkit(); Dimension dm = tk.getScreenSize(); Background = r.createScreenCapture(new Rectangle(0, 0, (int) dm .getWidth(), (int) dm.getHeight())); System.out.println(Background); } catch (Exception e) { e.printStackTrace(); } this.setSize(600, 600); // this.setUndecorated(true); //这句要不注释掉，就啥都看不到了 this.setVisible(true); } public void paint(Graphics g) { p0 = this.getLocationOnScreen(); System.out.println(p0); p1 = new Point(-p0.x, -p0.y); g.drawImage(Background, p1.x, p1.y, null); repaint(); } public static void main(String[] args) { new Test(); } }