Java tutorial
//package com.java2s; import java.io.File; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.TransformerFactoryConfigurationError; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; public class Main { /** * Updates existing file with Document object * * @param doc * xml document * @param file * xml file to update * @throws TransformerFactoryConfigurationError */ public static void updateXMLFile(Document doc, File file) throws TransformerFactoryConfigurationError { try { DOMSource source = new DOMSource(doc); TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); StreamResult result = new StreamResult(file); transformer.transform(source, result); } catch (Exception e) { throw new RuntimeException("Exception while saving message to xml file", e); } } }