Convert HTML to plain text in Java

Question

I need to convert HTML to plain text. My only requirement of formatting is to retain new lines in the plain text. New lines should be displayed not only in the case of <

Answer 1

JSoup is not FreeMarker (or any other customer/non-HTML tag) compatible. Consider this as the most pure solution for converting Html to plain text.

http://stackoverflow.com/questions/1518675/open-source-java-library-for-html-to-text-conversion/1519726#1519726 My code:

return new net.htmlparser.jericho.Source(html).getRenderer().setMaxLineLength(Integer.MAX_VALUE).setNewLine(null).toString();

Answer 2

I would use SAX. If your document is not well-formed XHTML, I would transform it with JTidy.

Answer 3

You can use XSLT for this purpose. Take a look at this link which addresses a similar problem.

Hope it is helpful.

Answer 4

Have your parser append text content and newlines to a StringBuilder.

final StringBuilder sb = new StringBuilder();
HTMLEditorKit.ParserCallback parserCallback = new HTMLEditorKit.ParserCallback() {
    public boolean readyForNewline;

    @Override
    public void handleText(final char[] data, final int pos) {
        String s = new String(data);
        sb.append(s.trim());
        readyForNewline = true;
    }

    @Override
    public void handleStartTag(final HTML.Tag t, final MutableAttributeSet a, final int pos) {
        if (readyForNewline && (t == HTML.Tag.DIV || t == HTML.Tag.BR || t == HTML.Tag.P)) {
            sb.append("\n");
            readyForNewline = false;
        }
    }

    @Override
    public void handleSimpleTag(final HTML.Tag t, final MutableAttributeSet a, final int pos) {
        handleStartTag(t, a, pos);
    }
};
new ParserDelegator().parse(new StringReader(html), parserCallback, false);

Answer 5

Building on your example, with a hint from html to plain text? message:

import java.io.*;

import org.jsoup.*;
import org.jsoup.nodes.*;

public class TestJsoup
{
  public void SimpleParse()
  {
    try
    {
      Document doc = Jsoup.connect("http://www.particle.kth.se/~lindsey/JavaCourse/Book/Part1/Java/Chapter09/scannerConsole.html").get();
      // Trick for better formatting
      doc.body().wrap("<pre></pre>");
      String text = doc.text();
      // Converting nbsp entities
      text = text.replaceAll("\u00A0", " ");
      System.out.print(text);
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }
  }

  public static void main(String args[])
  {
    TestJsoup tjs = new TestJsoup();
    tjs.SimpleParse();
  }
}

Answer 6

I would guess you could use the ParserCallback.

You would need to add code to support the tags that require special handling. There are:

1. handleStartTag
2. handleEndTag
3. handleSimpleTag

callbacks that should allow you to check for the tags you want to monitor and then append a newline character to your buffer.