用JTextPane写的写字板怎么保存住图片和文字格式？

我写的写字板，文本编辑区用的JTextPane，实现了插入图片，以及单独设置选中部分字体，但不知怎么保存打开。目前只能做到像系统自带的记事本一样（字体的个体属性存不下来）。请赐教。试了试写序列化，照猫画虎的写下来还是不行。贴上我的部分代码，万谢啦 :) 很着急啊！！斜线注释了的部分是只能像记事本那样保存打开的代码，其他的是我照猫画虎写的序列化。    void SaveAssist(File fl)《--保存用到的函数
    {
        try
        {
//            RTFEditorKit rtfEditor = new RTFEditorKit();
//            TextArea.setEditorKit(rtfEditor);
            FileOutputStream fos = null;
            fos = new FileOutputStream(fl);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(sd);
            oos.flush();
            oos.close();
        }
        catch(IOException ioe)
        {
            System.err.println("IOException: " + ioe.getMessage());
        }
//        FileOutputStream fos = null;
//        String text = TextArea.getText();
//        try
//        {
//            fos = new FileOutputStream(fl);
//        }
//        catch(FileNotFoundException fnfe)
//        {
//            System.err.println(fnfe);
//            return;
//        }
//        catch(IOException ioe)
//        {
//            System.err.println(ioe);
//        }
//        finally
//        {
//            try
//            {
//                if (fos != null)
//                fos.close();
//            }
//            catch(IOException ioe){}
//        }
        saved = true;
        setTitle(fl.getName()+" - 文档");
        File_Save.setEnabled(false);
        Tool_Save.setEnabled(false);
    }    void OpenAssist()《--打开用到的函数
    {
        JFileChooser fc = new JFileChooser();
        FileFilterr f1 = new FileFilterr(".txt","文本文档(*.txt)");
        FileFilterr f2 = new FileFilterr(".doc","Word 文档(*.doc)");
        fc.addChoosableFileFilter(f1);
        fc.addChoosableFileFilter(f2);
        if(fc.showOpenDialog(this)==JFileChooser.APPROVE_OPTION)
        {
            File file = new File(fc.getCurrentDirectory(), fc.getName());
            if(file.exists())
            {
//                try
//                {
//                BufferedReader br = new BufferedReader(new FileReader(file));
//    String string;
//    while ((string = br.readLine())!=null)
//                    TextArea.setText(string);
//                br.close();
//    TextArea.setCaretPosition(0);
//                }
//                catch(IOException ioe)
//                {
//                    System.err.println(ioe);
//                }
//            }
//            else
//            {
//                JOptionPane.showMessageDialog(null,fc.getSelectedFile().getName() + "\n找不到文件\n请检查所给的文件名是否正确","打开",0);
//            }
                FileInputStream fis = null;
                try
                {
//            RTFEditorKit rtfEditor = new RTFEditorKit();
//            TextArea.setEditorKit(rtfEditor);
                    fis = new FileInputStream(file);
                    ObjectInputStream ois = new ObjectInputStream(fis); 
                    TextArea.setStyledDocument((StyledDocument)ois.readObject());
                    ois.close();
                    validate();
                }
                catch (IOException ioe)
                {
                    System.err.println("IOException: " + ioe.getMessage());
                }
                catch (ClassNotFoundException cnf)
                {
    System.err.println("Class not found: " + cnf.getMessage());
}
                catch (Exception e)
                {
                    e.printStackTrace();
                }
                finally
                {
                    try
                    {
                        if(fis!=null)
                            fis.close();
                         if(fc.getChoosableFileFilters()!=null)
                         {
                            fc.removeChoosableFileFilter(f1);
                            fc.removeChoosableFileFilter(f2);
                         }
                    }
                    catch(IOException ie){}
                }
            }
        }
    }