Here you can find the source of readAll(InputStream in)
private static byte[] readAll(InputStream in) throws IOException
//package com.java2s; /*/* ww w. j a v a 2s .co m*/ * Copyright 2012-2017 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat 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 2, or (at your * option) any later version. * * Thermostat 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 Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { private static byte[] readAll(InputStream in) throws IOException { final int TEMPORARY_BUFFER_SIZE = 1024; ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[TEMPORARY_BUFFER_SIZE]; int read; while ((read = in.read(buffer)) != -1) { baos.write(buffer, 0, read); } return baos.toByteArray(); } }