StyledDocument doc = new DefaultStyledDocument();
JTextPane pane = new JTextPane (doc);
 
Icon icon = new ImageIcon (imagePath);
pane.insertIcon (icon);
 
 
//Later while saving the values of the image use.
FileOutputStream fos = new FileOutputStream (fileName);
ObjectOutputStream oos = new ObjectOutputStream (fos);
oos.writeObject (doc); //doc is ur styled document
oos.flush();
oos.close();
 
// Else use this/
try {
        // Get the text pane's document
        JTextPane textPane = new JTextPane();
        StyledDocument doc = (StyledDocument)textPane.getDocument();
    
        // The image must first be wrapped in a style
        Style style = doc.addStyle("StyleName", null);
        StyleConstants.setIcon(style, new ImageIcon("imagefile"));
    
        // Insert the image at the end of the text
        doc.insertString(doc.getLength(), "ignored text", style);
    } catch (BadLocationException e) {
    }
//Later read the icon from the StyledDocument.