本文实例讲述了Java模拟QQ桌面截图功能实现方法。分享给大家供大家参考。具体如下：
QQ的桌面截图功能非常方便，去年曾用Java模拟过一个，现整理出来。
本方法首先需要抓到屏幕的整个图象，将图象显示在一个JFrame中，再将JFrame全屏显示，这样就模拟出了一个桌面，Java也就可以获得鼠标的作用区域从而实现桌面中的小范围截屏。
import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseMotionListener;/** * 用Java模拟出QQ桌面截图功能 */public class Test extends JFrame { private static final long serialVersionUID = -267804510087895906L; private JButton button = null; private JLabel imgLabel = null; public Test() { button = new JButton("模拟屏幕（点右键退出）"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { new ScreenWindow(imgLabel); } catch (Exception e1) { JOptionPane.showConfirmDialog(null, "出现意外错误！", "系统提示", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE); } } }); JPanel pane = new JPanel(); pane.setBackground(Color.WHITE); imgLabel = new JLabel(); pane.add(imgLabel); JScrollPane spane = new JScrollPane(pane); this.getContentPane().add(button, BorderLayout.NORTH); this.getContentPane().add(spane); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setSize(300, 200); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { new Test(); }}class ScreenWindow extends JFrame { private static final long serialVersionUID = -3758062802950480258L; private boolean isDrag = false; private int x = 0; private int y = 0; private int xEnd = 0; private int yEnd = 0; public ScreenWindow(final JLabel imgLabel) throws AWTException, InterruptedException { Dimension screenDims = Toolkit.getDefaultToolkit().getScreenSize(); JLabel label = new JLabel(new ImageIcon(ScreenImage.getScreenImage(0, 0, screenDims.width, screenDims.height))); label.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR)); label.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON3) { dispose(); } } public void mousePressed(MouseEvent e) { x = e.getX(); y = e.getY(); } public void mouseReleased(MouseEvent e) { if (isDrag) { xEnd = e.getX(); yEnd = e.getY(); if(x > xEnd){ int temp = x; x = xEnd; xEnd = temp; } if(y > yEnd){ int temp = y; y = yEnd; yEnd = temp; } try { imgLabel.setIcon(new ImageIcon(ScreenImage.getScreenImage(x, y, xEnd - x, yEnd - y))); } catch (Exception ex) { JOptionPane.showConfirmDialog(null, "出现意外错误！", "系统提示", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE); } dispose(); } } }); label.addMouseMotionListener(new MouseMotionListener() { public void mouseDragged(MouseEvent e) { if(!isDrag) isDrag = true; } public void mouseMoved(MouseEvent e) { /** 拖动过程的虚线选取框需自己实现 */ } }); this.setUndecorated(true); this.getContentPane().add(label); this.setSize(screenDims.width, screenDims.height); this.setVisible(true); this.setExtendedState(JFrame.MAXIMIZED_BOTH); }}class ScreenImage { public static Image getScreenImage(int x, int y, int w, int h) throws AWTException, InterruptedException { Robot robot = new Robot(); Image screen = robot.createScreenCapture(new Rectangle(x, y, w, h)).getScaledInstance(w, h, Image.SCALE_SMOOTH); MediaTracker tracker = new MediaTracker(new Label()); tracker.addImage(screen, 1); tracker.waitForID(0); return screen; }}希望本文所述对大家的java程序设计有所帮助。