Here you can find the source of printPrettyXML(Document doc)
public static String printPrettyXML(Document doc) throws Exception
//package com.java2s; /******************************************************************************* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * //from w w w.j a v a2 s. c om * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. *******************************************************************************/ import java.io.StringWriter; import javax.xml.transform.Transformer; 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 printPrettyXML(Document doc) throws Exception { Transformer transformer = TransformerFactory.newInstance().newTransformer(); transformer.setOutputProperty("indent", "yes"); transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "3"); StringWriter output = new StringWriter(); transformer.transform(new DOMSource(doc), new StreamResult(output)); return output.toString(); } }