Is it possible to write into the clipboard with HTML flavor ?

Question

Hello,
Last week I already posted this question in the awt abstract  forum, but since nobody answered, I guess it was not the right place. Thanks for any suggestions or comments
I'm having a problem with the code below. Here is the scenario I wish to perform :
1. Display a web page with my favorite navigator
2. Select a few lines from this page and copy this area to the clipboard (CTL-C)
3. When doing CTL-V (move) in a JTextPane, I intercept this action, to manipulate the data ( method clearClipBoard)
4. This method does the following
a) read the clipboard get the result into a String (this works fine).
b) loop on this String to find occurrences of a particular word, and suppress the line containing this word.
c) re-write the new String into the clipboard.
This works pretty well when having the JTextPane with a RTF EditorKit. But it does not work with an HTMLEditorKit.
I guess there is something wrong with DataFlavors, but I don't know how to set the DataFlavor to a text/html mime when writting the data back.
When testing the authorized DataFlavor, none "text/html" mimes appear and of course I get an exception for the one I'm trying to use.
Therefore the data is just a continuous string displayed in the JTextPane with all html tags visible instead of having formated data
I did a lot of tries, but I failed. below is a piece of code I'm using.
Thanks a lot, for any suggestions<
Gégé
private void clearClipboard()
  String      str     =      null,
               result =      null;
DataFlavor           flv          =      null;
StringWriter             sw           =     null;
try
     flv = new DataFlavor("text/html;charset=unicode;class=java.lang.String" );
     result= readClipBoard(flv );    //  This works fine
     sw = new StringWriter();       
     BufferedReader buffreader = new BufferedReader( new StringReader(result));
     BufferedWriter buffwriter = new BufferedWriter(sw);
     while ((str = buffreader.readLine()) != null)
        if (str.length() <= 0) continue;
        str=str.trim();                            
        String wk = "";
        while (true)
           //  re-create the string...... into str.  then break;     
        buffwriter.write(str);
  buffwriter.close();
catch(Exception e) { e.printStackTrace();}
writeClipBoard(sw.toString(),flv);      // on écrit dans le clipboad
public static void  writeClipBoard(String s, DataFlavor flavor)
   try
      java.awt.datatransfer.Clipboard  clipboard = 
                        java.awt.Toolkit.getDefaultToolkit().getSystemClipboard();
      java.awt.datatransfer.Transferable transferable =
                   new java.awt.datatransfer.StringSelection(s);
      //  DataFlavor[] flv = transferable.getTransferDataFlavors();
      //   for (int i=0; i<flv.length; i++) System.out.println(flv.toString());
// The Dataflavor I'm using is not in the flv table and
// of course it raises an exception.
transferable.getTransferData(flavor);
clipboard.setContents(transferable, null);
catch (Exception ex) {System.out.println( ex.toString());}

Answer 1

Stanislav, I'm back with my complete test code.
In fact, rather than modifying anything, I wrote this sample to just read the clipboard and write it back (without any change).
1) First, you may test it without entering my code (that's the default) . Just start my sample.
2) Go to your favorite Web browser. Select a few lines, and (copy to clipboard)
3) Go to the application and "Paste" I works fine
4) Then if you go to the initialize method, and please, uncomment the instruction where I'm defining the KeyListener (at the end of the method).
5) Restart the application and redo the same. It does not work.
In the list of flavors that I have printed (I got only 2 valid flavors, I tested both, without any success. I even try to set the flavor to null (got an exception of course).
Thanks again to your help. I hope my English is not too bad, to make you understand.
Gege
package test;
import java.awt.datatransfer.DataFlavor;
import java.awt.event.ActionListener;
import java.awt.event.KeyListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.StringReader;
import java.io.StringWriter;
import javax.swing.text.html.HTMLEditorKit;
public class TestTextPane extends javax.swing.JFrame implements KeyListener, ActionListener
     private static final long serialVersionUID = 1L;
     private final javax.swing.JTextPane myTextPane =   new javax.swing.JTextPane();
     private final javax.swing.JPanel frameContentPane = new javax.swing.JPanel();
     private final javax.swing.JButton  Terminer = new javax.swing.JButton();
     public TestTextPane() {
          super();
          initialize();
      public void actionPerformed(java.awt.event.ActionEvent e)
           System.exit(0);
    public static void clearClipboard()
         String      str          =      null,
                   result      =      null;
                    DataFlavor           flv          =      null;
                   StringWriter      sw           =     null;
         try
              flv = new DataFlavor("text/html;charset=unicode;class=java.lang.String" );
              result=  readClipBoard(flv );    // get clipboard content
              sw = new StringWriter();       
              BufferedReader buffreader = new BufferedReader( new StringReader(result));
              BufferedWriter buffwriter = new BufferedWriter(sw);
              while ((str = buffreader.readLine()) != null)
                   //  I re-write without processing     to see what's happening     
                   System.out.println(str);
                   buffwriter.write(str);
              buffwriter.close();
         catch(Exception e) { e.printStackTrace();}
         writeClipBoard(sw.toString(),flv); // on écrit dans le clipboad
     public static void writeClipBoard(String s, DataFlavor flavor)
     try
            // flavor= new DataFlavor("application/x-java-serialized-object;class=java.lang.String");
          java.awt.datatransfer.Clipboard  clipboard = 
                    java.awt.Toolkit.getDefaultToolkit().getSystemClipboard();
          java.awt.datatransfer.Transferable transferable =
                    new java.awt.datatransfer.StringSelection(s);
          DataFlavor[] flv = transferable.getTransferDataFlavors();
          for (int i=0; i<flv.length; i++) System.out.println(flv.toString());
          transferable.getTransferData(flavor);
          clipboard.setContents(transferable, null);
     catch (Exception ex) {System.out.println( ex.toString());}
public void FrameCenter( )
     java.awt.Dimension fenetre = this.getSize();
     int sizex = fenetre.width, sizey = fenetre.height;
     java.awt.Dimension screen = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
          setBounds((screen.width - sizex) / 2,(screen.height - sizey) / 2, sizex, sizey);
private void initialize()
          setName("TestTextPane");
          setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
          setSize(557, 451);
          myTextPane.setName("myTextPane");
          myTextPane.setBounds(23, 18, 513, 307);
          Terminer.setName("Terminer");
          Terminer.setText("Finish");
          Terminer.setBounds(230, 370, 101, 25);
          frameContentPane.setName("myFrame");
          frameContentPane.setLayout(null);
          frameContentPane.add(myTextPane, myTextPane.getName());
          frameContentPane.add(Terminer, Terminer.getName());
          setContentPane( frameContentPane);
          Terminer.addActionListener(this);
          FrameCenter( );
          HTMLEditorKit htmlKit = new HTMLEditorKit();
          myTextPane.setEditorKit(htmlKit);
          myTextPane.setEditable(true);
          myTextPane.setText("Hello. Clipbard contains should be appended below" );
          // myTextPane.addKeyListener(this); // to be uncommented to trap clipboard events
this.setVisible(true);
     public void keyPressed(java.awt.event.KeyEvent ke)
          if (ke.getKeyCode() == java.awt.event.KeyEvent.VK_V)
               int i = ke.getModifiers();
               if ( (i & java.awt.event.InputEvent.CTRL_MASK) == java.awt.event.InputEvent.CTRL_MASK)      {clearClipboard();}
     public void keyReleased(java.awt.event.KeyEvent ke){}
     public void keyTyped(java.awt.event.KeyEvent ke){}
     public static String readClipBoard(DataFlavor type)
          java.awt.datatransfer.Transferable contents = java.awt.Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
          if (! contents.isDataFlavorSupported(type) ) return null;
          if ((contents != null) && contents.isDataFlavorSupported(type))
               try
                    return (String) contents.getTransferData(type);
               catch (java.awt.datatransfer.UnsupportedFlavorException ex){return  ex.toString();     }
               catch (java.io.IOException ex)      {return  ex.toString();     }
          else return "";
     public static void main(java.lang.String[] args) {
          new TestTextPane();