How to get document's length of JTextPane

Question

Hi all,
I loaded the content of JTextPane by invoking setPage(URL url), but the length of the styledDocument is ZERO
textPane.setPage(new URL("http://www.google.com"));
StyledDocument doc = textPane.getStyledDocument();
System.out.println("doc.getLength(): " + doc.getLength());  // the result is: doc.getLength(): 0Could you tell me why and how to work around?
Any help is appreciated!
Thanks in advance.
Daniel.Sun

Answer 1

Try calling it after your Swing visible components have been rendered:
import java.awt.Dimension;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.StyledDocument;
public class DocumentLength
  private JPanel mainPanel = new JPanel();
  private JTextPane textPane = new JTextPane();
  public DocumentLength()
    JScrollPane scrollpane = new JScrollPane(textPane);
    scrollpane.setPreferredSize(new Dimension(500, 300));
    try
      textPane.setPage(new URL("http://www.google.com"));
    catch (MalformedURLException e)
      e.printStackTrace();
    catch (IOException e)
      e.printStackTrace();
    mainPanel.add(scrollpane);
    System.out.println("BEFORE RENDERING: doc.getLength() = " + getDocLength());
  public int getDocLength()
    StyledDocument doc = textPane.getStyledDocument();
    return doc.getLength();
  public JPanel getMainPanel()
    return mainPanel;
  private static void createAndShowUI()
    DocumentLength docLength = new DocumentLength();
    JFrame frame = new JFrame("Document Length");
    frame.getContentPane().add(docLength.getMainPanel());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    System.out.println("AFTER RENDERING: doc.getLength() = " + docLength.getDocLength());
  public static void main(String[] args)
    java.awt.EventQueue.invokeLater(new Runnable()
      public void run()
        createAndShowUI();
}