how to save panel as image in swing?

Question

Hi i want to convert panel which contains components like label and buttons to image file.

I have done the following code. The image was saved. but the content of th

Answer 1

Tthis code works for me (in the JFrame):

Container c = getContentPane();
BufferedImage im = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
c.paint(im.getGraphics());
ImageIO.write(im, "PNG", new File("shot.png"));

Maybe you have used custom panels. If true, try to add super.paint(g) at the beginning of the paint methods of your panels.

EDIT: You have to call saveImage after display the frame:

public static void main(String args[]) {
    ...
    frame.setSize(400, 300);
    sam.saveImage(sam.firstpanel);
}

EDIT 2: This is the saved image (is little because the layout, but is the proof that it should work):

I called the saveImage as last call in the main, and used a file in the user dir (new File("Screen.png")) as nIcE cOw said.

Answer 2

Here try this example program, instead of using getGraphics() seems like you have to use createGraphics() for the BufferedImage you are about to make.

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.*;

public class SnapshotExample
{
    private JPanel contentPane;

    private void displayGUI()
    {
        JFrame frame = new JFrame("Snapshot Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        contentPane = new JPanel();
        contentPane.setOpaque(true);
        contentPane.setBackground(Color.WHITE);
        JLabel label = new JLabel("This JLabel will display"
                        + " itself on the SNAPSHOT", JLabel.CENTER);
        contentPane.add(label);

        frame.setContentPane(contentPane);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);

        makePanelImage(contentPane);
    }

    private void makePanelImage(Component panel)
    {
        Dimension size = panel.getSize();
        BufferedImage image = new BufferedImage(
                    size.width, size.height 
                              , BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = image.createGraphics();
        panel.paint(g2);
        try
        {
            ImageIO.write(image, "png", new File("snapshot.png"));
            System.out.println("Panel saved as Image.");
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {           
                new SnapshotExample().displayGUI();
            }
        });
    }
}