Reading file

I am using the following code to read a file. I read the file, do some modifications on it and save it, and I see that my changes have been applied to the file, but when I open the file again in JEditorPane I can't see what I have added to it. the changes that I make to the file are just adding some lines to the end of it.

Code :

public void actionPerformed(ActionEvent e) {
 
    	JEditorPane note = new JEditorPane();
        //Handle open button action.
       if (e.getActionCommand().equals("New File")) {
            int returnVal = fc.showOpenDialog(UpLoadListener.this);
 
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                file = fc.getSelectedFile();
 
                try {
					Content =  file.toURI().toURL();
						if (Content != null) {
								try {
									 note.setContentType("text/html");
									 note.setPage(Content);
 
									} catch (IOException e1) {
									System.err.println("Attempted to read a bad URL: " + Content);
								}
						} else {
							System.err.println("Couldn't find file");
						}
 
				} 
               catch (MalformedURLException e2) {
					// TODO Auto-generated catch block
					e2.printStackTrace();
				}
            }
        }
    }