Here you can find the source of copyStreamPortion(java.io.InputStream inputStream, java.io.OutputStream outputStream, int portionSize, int bufferSize)
public static void copyStreamPortion(java.io.InputStream inputStream, java.io.OutputStream outputStream, int portionSize, int bufferSize) throws IOException
//package com.java2s; /*//from www .j a v a 2 s .c o m * DBeaver - Universal Database Manager * Copyright (C) 2010-2016 Serge Rieder (serge@jkiss.org) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License (version 2) * as published by the Free Software Foundation. * * 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, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ import java.io.*; public class Main { /** Read entire input stream portion and writes it data to output stream */ public static void copyStreamPortion(java.io.InputStream inputStream, java.io.OutputStream outputStream, int portionSize, int bufferSize) throws IOException { if (bufferSize > portionSize) { bufferSize = portionSize; } byte[] writeBuffer = new byte[bufferSize]; int totalRead = 0; while (totalRead < portionSize) { int bytesToRead = bufferSize; if (bytesToRead > portionSize - totalRead) { bytesToRead = portionSize - totalRead; } int bytesRead = inputStream.read(writeBuffer, 0, bytesToRead); outputStream.write(writeBuffer, 0, bytesRead); totalRead += bytesRead; } // Close input stream outputStream.flush(); } }