桌面截图功能
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;
}
}
截屏
public class GuiCamera {
private String fileName; //文件的前缀
private String defaultName = "GuiCamera";
static int serialNum = 0;
private String imageFormat; //图像文件的格式
private String defaultImageFormat = "png";
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
/****************************************************************
* 默认的文件前缀为GuiCamera，文件格式为PNG格式
* The default construct will use the default
* Image file surname "GuiCamera",
* and default image format "png"
****************************************************************/
public GuiCamera() {
fileName = defaultName;
imageFormat = defaultImageFormat;
}
/****************************************************************
* @param s the surname of the snapshot file
* @param format the format of the image file,
* it can be "jpg" or "png"
* 本构造支持JPG和PNG文件的存储
****************************************************************/
public GuiCamera(String s, String format) {
fileName = s;
imageFormat = format;
}
/****************************************************************
* 对屏幕进行拍照
* snapShot the Gui once
****************************************************************/
public void snapShot() {
try {
//拷贝屏幕到一个BufferedImage对象screenshot
BufferedImage screenshot = (new Robot())
.createScreenCapture(new Rectangle(0, 0,
(int) d.getWidth(), (int) d.getHeight()));
serialNum++;
//根据文件前缀变量和文件格式变量，自动生成文件名
String name = fileName + String.valueOf(serialNum) + "."
+ imageFormat;
File f = new File(name);
System.out.print("Save File " + name);
//将screenshot对象写入图像文件
ImageIO.write(screenshot, imageFormat, f);
System.out.print("..Finished!\n");
} catch (Exception ex) {
System.out.println(ex);
}
}
public static void main(String[] args) {
GuiCamera cam = new GuiCamera("d:\\Hello", "png");//
cam.snapShot();
}
}
透明窗体
public class TransparentBackground extends JComponent implements
ComponentListener, WindowFocusListener, Runnable {
private JFrame frame;
private Image background;
private long lastupdate = 0;
public boolean refreshRequested = true;
public TransparentBackground(JFrame frame) {
this.frame = frame;
updateBackground();
frame.addComponentListener(this);
frame.addWindowFocusListener(this);
new Thread(this).start();
}
public void componentShown(ComponentEvent evt) {
repaint();
}
public void componentResized(ComponentEvent evt) {
repaint();
}
public void componentMoved(ComponentEvent evt) {
repaint();
}
public void componentHidden(ComponentEvent evt) {
}
public void windowGainedFocus(WindowEvent evt) {
refresh();
}
public void windowLostFocus(WindowEvent evt) {
refresh();
}
public void refresh() {
if (frame.isVisible()) {
repaint();
refreshRequested = true;
lastupdate = new Date().getTime();
}
}
public void run() {
try {
while (true) {
Thread.sleep(250);
long now = new Date().getTime();
if (refreshRequested && ((now - lastupdate) > 1000)) {
if (frame.isVisible()) {
Point location = frame.getLocation();
// frame.setVisible(false);
updateBackground();
// frame.setVisible(true);
frame.setLocation(location);
refresh();
}
lastupdate = now;
refreshRequested = false;
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Transparent Window");
frame.setUndecorated(true);
TransparentBackground bg = new TransparentBackground(frame);
// bg.snapBackground();
bg.setLayout(new BorderLayout());
JPanel panel = new JPanel() {
public void paintComponent(Graphics g) {
g.setColor(Color.blue);
Image img = new ImageIcon("d:/moon.gif").getImage();
g.drawImage(img, 150, 150, null);
// g.drawLine(0,0, 600, 500);
}
};
panel.setOpaque(false);
JLabel jl=new JLabel(new ImageIcon("d:/moon.gif"));
bg.add("North", jl);
bg.add("Center", panel);
frame.getContentPane().add("Center", bg);
frame.pack();
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension dim = tk.getScreenSize();
frame.setSize((int) dim.getWidth(), (int) dim.getHeight());
frame.setLocationRelativeTo(null);
frame.show();
}
public void updateBackground() {
try {
Robot rbt = new Robot();
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension dim = tk.getScreenSize();
background = rbt.createScreenCapture(new Rectangle(0, 0, (int) dim
.getWidth(), (int) dim.getHeight()));
} catch (Exception ex) {
// p(ex.toString( ));
// 此方法没有申明过，因为无法得知上下文。因为不影响执行效果，先注释掉它
ex.printStackTrace();
}
}
public void paintComponent(Graphics g) {
Point pos = this.getLocationOnScreen();
Point offset = new Point(-pos.x, -pos.y);
g.drawImage(background, offset.x, offset.y, null);
}
}