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How to Preserve Line Breaks When Converting HTML to Text Using Jsoup?

DDDOriginal: 2024-10-31 20:37:29147browse

Preserving Line Breaks in HTML-to-Text Conversion Using Jsoup

When converting HTML to plain text using jsoup, preserving line breaks can be crucial for maintaining the readability and structure of the output. By default, jsoup's text() method does not retain line breaks present in the HTML code.

Solution:

To preserve line breaks effectively, utilize the br2nl() method, which incorporates the following enhancements:

Preserve Existing Newlines: If the original HTML contains newline characters (n), they are preserved in the output.
Convert
and
Tags: Line breaks are introduced by appending n to the contents of
tags. Additionally, nn is prepended to the contents of
tags to signify new paragraphs.
Post-Processing: The modified HTML is rendered, and any remaining escaped newlines (\n) are converted to actual newlines (n). To ensure proper handling of other special characters, the resultant string is cleaned using Jsoup.clean().

Usage:

<code class="java">import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class LineBreakPreserver {

    public static String br2nl(String html) {
        if (html == null) {
            return html;
        }

        Document document = Jsoup.parse(html);
        document.outputSettings(new Document.OutputSettings().prettyPrint(false));
        document.select("br").append("\n");
        document.select("p").prepend("\n\n");
        String s = document.html().replaceAll("\\n", "\n");
        return Jsoup.clean(s, "", Whitelist.none(), new Document.OutputSettings().prettyPrint(false));
    }

    public static void main(String[] args) {
        String html = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN \">" +
                "<HTML> <HEAD> <TITLE></TITLE> <style>body{ font-size: 12px;font-family: verdana, arial, helvetica, sans-serif;}</style> </HEAD> <BODY><p><b>hello world</b></p><p><br><b>yo</b> <a href=\"http://google.com\">googlez</a></p></BODY> </HTML> ";

        String result = br2nl(html);
        System.out.println(result);
    }
}</code>

Output:

hello world
yo googlez

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