Getting raw text from JTextPane

问题

In my application, I use a JTextPane to display some log information. As I want to hightlight some specific lines in this text (for example the error messages), I set the contentType as "text/html". This way, I can format my text.

Now, I create a JButton that copies the content of this JTextPane into the clipboard. That part is easy, but my problem is that when I call myTextPane.getText(), I get the HTML code, such as :

<html>
  <head>

  </head>
  <body>
    blabla<br>
    <font color="#FFCC66"><b>foobar</b></font><br>
    blabla
  </body>
</html>

instead of getting only the raw content:

blabla
foobar
blabla

Is there a way to get only the content of my JTextPane in plain text? Or do I need to transform the HTML into raw text by myself?

回答1:

Based on the accepted answer to: Removing HTML from a Java String

MyHtml2Text parser = new MyHtml2Text();
try {
    parser.parse(new StringReader(myTextPane.getText()));
} catch (IOException ee) {
  //handle exception
}
System.out.println(parser.getText());

Slightly modified version of the Html2Text class found on the answer I linked to

import java.io.IOException;
import javax.swing.text.html.*;
import javax.swing.text.html.parser.*;

public class MyHtml2Text extends HTMLEditorKit.ParserCallback {
    StringBuffer s;
    public MyHtml2Text() {}
    public void parse(Reader in) throws IOException {
        s = new StringBuffer();
        ParserDelegator delegator = new ParserDelegator();
        delegator.parse(in, this, Boolean.TRUE);
    }
    public void handleText(char[] text, int pos) {
        s.append(text);
        s.append("\n");
    }
    public String getText() {
        return s.toString();
    }
}

If you need a more fine-grained handling consider implementing more of the interface defined by HTMLEditorKit.ParserCallback

回答2:

No need to use the ParserCallback. Just use:

textPane.getDocument().getText(0, textPane.getDocument().getLength()) );

回答3:

You need to do it yourself unfortunately. Imagine if some of the contents was HTML specific, eg images - the text representation is unclear. Include alt text or not for instance.

回答4:

(Is RegExp allowed? This isn't parsing, isn't it)

Take the getText() result and use String.replaceAll() to filter all tags. Than a trim() to remove leading and trailing whitespaces. For the whitespaces between your first and you last 'blabla' I don't see a general solution. Maybe you can spilt the rest around CRLF and trim all Strings again.

(I'm no regexp expert - maybe someone can provide the regexp and earn some reputation ;) )

Edit

.. I just assumed that you don't use < and > in your text - otherwise it.. say, it's a challenge.

来源：https://stackoverflow.com/questions/1859686/getting-raw-text-from-jtextpane

标签

java

swing

jtextpane