Question

I have a JLabel inside which I have saved my ImageIcon like this:

ImageIcon imageIcon = sample.map(); // a map method create an ImageIcon object
imageLabel.setIcon(imageIcon);
imageLabel.setVisible(true);

Now I would like to save this ImageIcon object into a PNG file when clicking on the Save item menu.

private void imageActionPerformed(java.awt.event.ActionEvent evt) {

    Icon pic = imageLabel.getIcon();

    JFileChooser fileChooser = new JFileChooser("C:/");  

    fileChooser.setSelectedFile(file);    

    // this filter will allow just PNG extension  
    FileFilter filter = new MyCustomFilter2();
    fileChooser.setFileFilter(filter);

    int returnVal = fileChooser.showSaveDialog(this);
    if (returnVal == JFileChooser.APPROVE_OPTION)
    {
        File fileToSave = fileChooser.getSelectedFile();
     }
    else
    {
    System.out.println("File access cancelled by user.");
    }
}

Yes I know that this code is wrong and some part is missing, I think I should somehow save my Icon object called pic into a File object. This is my assumption. How can I do it please?

Thanks for any help,

Michal.

Here is my source code

private void imageActionPerformed(java.awt.event.ActionEvent evt) {
    try{
    Icon image = imageLabel.getIcon();

    BufferedImage bi = new BufferedImage(image.getIconWidth(),image.getIconHeight(),BufferedImage.TYPE_INT_RGB);
    Graphics g = bi.createGraphics();

    File file = new File("outputFile");
    JFileChooser fileChooser = new JFileChooser("C:/");  
    fileChooser.setSelectedFile(file);    

    FileFilter filter = new MyCustomFilter2();
    fileChooser.setFileFilter(filter);

    int returnVal = fileChooser.showSaveDialog(this);
    if (returnVal == JFileChooser.APPROVE_OPTION)
     {
      ImageIO.write(bi, "PNG", file);
      File fileToSave = fileChooser.getSelectedFile();

     }
    else
     {
      System.out.println("File access cancelled by user.");
     }
  }

catch(IOException e){
    e.printStackTrace();
   }
}

Answer 1

The File object returned by the JFileChooser just represents the location on disk where the user would like to save the file. After that you’ll want to use ImageIO.write() to save the file to disk.

e.g.

ImageIO.write(image, "png", file);

If you have an Icon, I think you may need to convert that to a BufferedImage before you can save it.