How do I convert a document made in Jsoup (the Java html parser) into a string

Have you tried:

Document doc = Jsoup.connect("http://en.wikipedia.org/").get();
String htmlString = doc.toString();

As Document extends Element it also has got the method html() which "Retrieves the element's inner HTML" according to the API. So that should work:

Document doc = Jsoup.connect("http://en.wikipedia.org/").get();
String htmlString = doc.html();

Additional Info:

Each Document object has got a reference to an instance of the inner class Document.OutputSettings which can be accessed via the method outputSettings() of Document. There you can enable/disable pretty-printing by using the setter prettyPrint(true/false). See the API for Document and Document.OutputSettings for furtherinformation

doc.toString() works, as does doc.outerHtml().