Java tutorial
//package com.java2s; import org.w3c.dom.Document; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.OutputStream; public class Main { public static void serializeDocument(Document doc, OutputStream outputStream) throws Exception { TransformerFactory tfactory = TransformerFactory.newInstance(); Transformer serializer = tfactory.newTransformer(); serializer.setOutputProperty(OutputKeys.INDENT, "yes"); serializer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4"); serializer.transform(new DOMSource(doc), new StreamResult(outputStream)); } }