Here you can find the source of getOutputStream(File file, boolean append)
public static OutputStream getOutputStream(File file, boolean append) throws IOException
//package com.java2s; /*// w ww. jav a2s . co m Copyright 2009 Semantic Discovery, Inc. (www.semanticdiscovery.com) This file is part of the Semantic Discovery Toolkit. The Semantic Discovery Toolkit is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. The Semantic Discovery Toolkit 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with The Semantic Discovery Toolkit. If not, see <http://www.gnu.org/licenses/>. */ import java.io.*; import java.util.zip.GZIPOutputStream; public class Main { /** * Get an output stream for a (possibly gzipped) file. */ public static OutputStream getOutputStream(File file, boolean append) throws IOException { // open the output stream for gzipped or plain text. OutputStream outputStream = new FileOutputStream(file, append); if (file.getName().toLowerCase().endsWith(".gz")) { outputStream = new GZIPOutputStream(outputStream); } return outputStream; } }