抓取思路是首先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

* @author 五斗米

* @blog http://blog.csdn.net/mq612

*/

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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