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。
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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;
}
}
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希望本文所述对大家的java程序设计有所帮助。