Here you can find the source of write(String filename, Document document, boolean addDocType)
public static boolean write(String filename, Document document, boolean addDocType)
//package com.java2s; import java.io.BufferedWriter; import java.io.FileOutputStream; import java.io.OutputStreamWriter; 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 org.w3c.dom.Document; public class Main { public static boolean write(String filename, Document document, boolean addDocType) { try {/*from ww w . ja v a 2 s . com*/ TransformerFactory tf = TransformerFactory.newInstance(); tf.setAttribute("indent-number", new Integer(4)); Transformer transformer = tf.newTransformer(); DOMSource source = new DOMSource(document); if (addDocType) { transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"); transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "http://java.sun.com/dtd/facelet-taglib_1_0.dtd"); } transformer.setOutputProperty(OutputKeys.METHOD, "xml"); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.transform(source, new StreamResult(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filename))))); return true; } catch (Exception e) { return false; } } }