Here you can find the source of inputStreamToBytes(InputStream in)
public static byte[] inputStreamToBytes(InputStream in) throws IOException
//package com.java2s; /******************************************************************************* * Copyright (c) 2001, 2007 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors://from www . j a va 2 s .c o m * IBM Corporation - initial API and implementation *******************************************************************************/ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.zip.ZipInputStream; import java.util.zip.ZipOutputStream; public class Main { /** * Read all the data from the input stream up until the first end of file character, add this * data to a byte array, and close the input stream; returns the byte array */ public static byte[] inputStreamToBytes(InputStream in) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); copy(in, out); return out.toByteArray(); } /** * Copy all the data from the input stream to the output stream up until the first end of file * character, and close the two streams */ public static void copy(InputStream in, OutputStream out) throws IOException { byte[] buffer = new byte[1024]; try { int n = in.read(buffer); while (n > 0) { out.write(buffer, 0, n); n = in.read(buffer); } } finally { if (!(in instanceof ZipInputStream)) in.close(); if (!(out instanceof ZipOutputStream)) out.close(); } } }