我想对我创建的面板进行截图，下面给出了代码。任何机构都可以告诉我为什么我没有得到。谢谢
public static final void makeScreenshot(JFrame argFrame)
{
Rectangle rec = argFrame.getBounds();
BufferedImage bufferedImage = new BufferedImage(rec.width, rec.height, BufferedImage.TYPE_INT_ARGB);
argFrame.paint(bufferedImage.getGraphics());
try
{
// Create temp file.
File temp = File.createTempFile("C:\\Documents and Settings\\SriHari\\My Documents\\NetBeansProjects\\test\\src\\testscreenshot", ".jpg");
// Use the ImageIO API to write the bufferedImage to a temporary file
ImageIO.write(bufferedImage, "jpg", temp);
//temp.deleteOnExit();
}
catch (IOException ioe) {}
} //
public static void main(String args[])
{
TimeTableGraphicsRunner ts= new TimeTableGraphicsRunner();
for(long i=1;i<1000000000;i++);
ts.makeScreenshot(jf);
System.out.println("hi");
}
以下对我有用：
public static void main (String [] args)
{
final JFrame frame = new JFrame ();
JButton button = new JButton (new AbstractAction ("Make Screenshot!")
{
@Override
public void actionPerformed (ActionEvent e)
{
Dimension size = frame.getSize ();
BufferedImage img = new BufferedImage (size.width, size.height, BufferedImage.TYPE_3BYTE_BGR);
Graphics g = img.getGraphics ();
frame.paint (g);
g.dispose ();
try
{
ImageIO.write (img, "png", new File ("screenshot.png"));
}
catch (IOException ex)
{
ex.printStackTrace ();
}
}
});
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane ().setLayout (new BorderLayout ());
frame.getContentPane ().add (button, BorderLayout.CENTER);
frame.pack ();
frame.setVisible (true);
}
它不呈现窗口标题和边框，因为这是由OS处理的，而不是Swing。
您可以尝试使用Robot#createScreenCapture之类的东西
如果您不想捕获整个屏幕，您可以使用Component#getLocationOnScreen来查找组件在屏幕上的位置…
public class CaptureScreen {
public static void main(String[] args) {
new CaptureScreen();
}
public CaptureScreen() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
frame.add(new JLabel("Smile :D"), gbc);
JButton capture = new JButton("Click");
capture.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
Robot robot = new Robot();
Rectangle bounds = frame.getBounds();
bounds.x -= 1;
bounds.y -= 1;
bounds.width += 2;
bounds.height += 2;
BufferedImage snapShot = robot.createScreenCapture(bounds);
ImageIO.write(snapShot, "png", new File("Snapshot.png"));
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
frame.add(capture, gbc);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
使用Component#getLocationOnScreen的示例
public class CaptureScreen {
public static void main(String[] args) {
new CaptureScreen();
}
public CaptureScreen() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
frame.add(new JLabel("Smile :D"), gbc);
JButton capture = new JButton("Click");
capture.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
Robot robot = new Robot();
Container panel = frame.getContentPane();
Point pos = panel.getLocationOnScreen();
Rectangle bounds = panel.getBounds();
bounds.x = pos.x;
bounds.y = pos.y;
bounds.x -= 1;
bounds.y -= 1;
bounds.width += 2;
bounds.height += 2;
BufferedImage snapShot = robot.createScreenCapture(bounds);
ImageIO.write(snapShot, "png", new File("Snapshot.png"));
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
frame.add(capture, gbc);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
另一个示例显示Component#getLocationOnScreen
图像的主要原因3相同，是因为示例转储根窗格、layerd窗格和内容窗格…
public class CaptureScreen {
public static void main(String[] args) {
new CaptureScreen();
}
public void save(Component comp, File file) {
if (comp.isVisible()) {
try {
System.out.println(comp);
Robot robot = new Robot();
Rectangle bounds = new Rectangle(comp.getLocationOnScreen(), comp.getSize());
bounds.x -= 1;
bounds.y -= 1;
bounds.width += 2;
bounds.height += 2;
BufferedImage snapShot = robot.createScreenCapture(bounds);
ImageIO.write(snapShot, "png", file);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
private int layer;
public void capture(Container container) {
layer = 1;
captureLayers(container);
}
public void captureLayers(Container container) {
save(container, new File("SnapShot-" + layer + "-0.png"));
int thisLayer = layer;
int count = 1;
for (Component comp : container.getComponents()) {
if (comp instanceof Container) {
layer++;
captureLayers((Container) comp);
} else {
save(comp, new File("SnapShot-" + thisLayer + "-" + count + ".png"));
count++;
}
}
}
public CaptureScreen() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
frame.add(new JLabel("Smile :D"), gbc);
JButton capture = new JButton("Click");
capture.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
capture(frame);
}
});
frame.add(capture, gbc);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
