Here you can find the source of toDocument(File f)
public static Document toDocument(File f) throws Exception
//package com.java2s; /*// w w w. j a v a2s . c o m JJSP - Java and Javascript Server Pages Copyright (C) 2016 Global Travel Ventures Ltd This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/. */ import org.w3c.dom.Document; import javax.xml.parsers.*; import java.io.ByteArrayInputStream; import java.io.File; import java.io.InputStream; public class Main { private static final ThreadLocal<DocumentBuilder> builder = new ThreadLocal<DocumentBuilder>() { @Override protected DocumentBuilder initialValue() { try { return DocumentBuilderFactory.newInstance().newDocumentBuilder(); } catch (ParserConfigurationException exc) { throw new IllegalArgumentException(exc); } } }; public static Document toDocument(File f) throws Exception { return builder.get().parse(f); } public static Document toDocument(String s) throws Exception { s = s.replaceAll("&", "&"); return toDocument(new ByteArrayInputStream(s.getBytes())); } public static Document toDocument(InputStream in) throws Exception { try { return builder.get().parse(in); } finally { in.close(); } } }