Java tutorial
//package com.java2s; import java.io.ByteArrayOutputStream; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; public class Main { public static String formatDocument2(Document document) throws TransformerException { DOMSource domSource = new DOMSource(document); ByteArrayOutputStream out = new ByteArrayOutputStream(); StreamResult streamResult = new StreamResult(out); TransformerFactory tf = TransformerFactory.newInstance(); Transformer serializer = tf.newTransformer(); serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); serializer.setOutputProperty(OutputKeys.INDENT, "yes"); serializer.transform(domSource, streamResult); return new String(out.toByteArray()); } }