Test.java
/**
* 用Java模拟出QQ桌面截图功能
* @author ZengYanHui , the student comes from Guang Dong Ocean University
*/
package edu.captureimage;
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
public class Test extends JFrame{
private static final long serialVersionUID = -267804510087895906L;
public static JFrame mainwindow = null; //主窗体
public Test(){
try {
//new ScreenWindow();
} catch (Exception e1) {
JOptionPane.showConfirmDialog(null, "出现意外错误！", "系统提示", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE);
}
setSize(200,300);
setVisible(true);
//同时按下CTRL+ALT+A按键事件
KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
manager.addKeyEventPostProcessor(new KeyEventPostProcessor(){
@Override
public boolean postProcessKeyEvent(KeyEvent e) {
// TODO Auto-generated method stub
//判断是否同时按下CTRL+ALT+A ， 若是则进行截图
if(e.isAltDown() && e.isControlDown() && e.getKeyCode() == KeyEvent.VK_A){
try {
setVisible(false);
new ScreenWindow(mainwindow);
} catch (Exception e1) {
JOptionPane.showConfirmDialog(null, "出现意外错误！", "系统提示", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE);
}
}
return false;
}
});
}
public static void main(String[] args) {
mainwindow = new Test();
}
}
ScreenWindow.java
/**
* 用Java模拟出QQ桌面截图功能
* @author ZengYanHui , the student comes from Guang Dong Ocean University
*/
package edu.captureimage;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class ScreenWindow extends JFrame {
private static final long serialVersionUID = -3758062802950480258L;
public Dimension screenDims = null; //屏幕大小
private boolean isDrag = false;
private int x = 0;
private int y = 0;
private int xEnd = 0;
private int yEnd = 0;
public ImageIcon screenImageIcon = null;
public JLabel label = null;
public JFrame copy_mainwindow; //引用 mainwindow 主窗体对象，mainwindow即为调用该截图模块的JFrame对象
public ScreenWindow(JFrame mainwindow) throws AWTException, InterruptedException {
screenDims = Toolkit.getDefaultToolkit().getScreenSize();
screenImageIcon = new ImageIcon(ScreenImage.getScreenImage(0, 0, screenDims.width, screenDims.height));
label = new JLabel(screenImageIcon);
label.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
copy_mainwindow = mainwindow;
//按键ESC退出事件
KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
manager.addKeyEventPostProcessor(new KeyEventPostProcessor() {
@Override
public boolean postProcessKeyEvent(KeyEvent e) {
if (KeyEvent.VK_ESCAPE == e.getKeyCode()) { //判断是否按下ESC键
dispose();
copy_mainwindow.setVisible(true);
}
return false;
}
});
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;
}
//保存文件
try {
JFileChooser filechooser = new JFileChooser();
//设置主目录
// filechooser.setCurrentDirectory(new File("C:\\Users\\miklejhon\\Desktop"));
//弹出保存文件的选择框
int result = filechooser.showSaveDialog(null);
//保存文件
if(result==JFileChooser.APPROVE_OPTION){
File selectedfile = filechooser.getSelectedFile();
File file = new File(selectedfile.getPath());
FileOutputStream fos = new FileOutputStream(file);
BufferedImage bufferedimage = new BufferedImage(xEnd - x,yEnd - y,BufferedImage.TYPE_INT_BGR);
Image image = ScreenImage.getScreenImage(x, y, xEnd - x, yEnd - y);
Graphics g = bufferedimage.getGraphics();
g.drawImage(image,0, 0,xEnd - x,yEnd - y,null);
g.setColor(Color.white);
g.drawRect(0, 0, xEnd - x, yEnd - y);
ImageIO.write(bufferedimage, "JPEG",fos);
fos.flush();
fos.close();
dispose();
copy_mainwindow.setVisible(true);
}else{
label.setIcon(screenImageIcon);
}
} catch (Exception ex) {
ex.printStackTrace();
JOptionPane.showConfirmDialog(null, "出现意外错误！", "系统提示", JOptionPane.DEFAULT_OPTION, JOptionPane.ERROR_MESSAGE);
}
}
}
});
//鼠标拖曳事件
label.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
if(!isDrag){
isDrag = true;
}
//拖动过程的虚线选取框实现
int endx = e.getX();
int endy = e.getY();
BufferedImage bufferedimage = new BufferedImage(screenDims.width, screenDims.height,BufferedImage.TYPE_INT_BGR);
Graphics g = bufferedimage.getGraphics();
g.drawImage(screenImageIcon.getImage(),0, 0,screenDims.width,screenDims.height,null);
g.setColor(Color.red);
g.drawRect(x, y, endx-x, endy-y);
label.setIcon(new ImageIcon(bufferedimage));
}
});
this.setUndecorated(true);
this.getContentPane().add(label);
this.setSize(screenDims.width, screenDims.height);
this.setVisible(true);
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
}
}
class ScreenImage {
//截图
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;
}
}
