Here you can find the source of toByteArray(InputStream is)
public static byte[] toByteArray(InputStream is) throws IOException
//package com.java2s; /*//from w w w . j ava 2s . co m * Copyright (c) 2014 Magnet Systems, Inc. * All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); you * may not use this file except in compliance with the License. You * may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or * implied. See the License for the specific language governing * permissions and limitations under the License. */ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static byte[] toByteArray(InputStream is) throws IOException { if (is == null) { return null; } ByteArrayOutputStream bos = new ByteArrayOutputStream(); try { byte[] buf = new byte[1024]; int count = 0; while ((count = is.read(buf)) != -1) { bos.write(buf, 0, count); } } finally { bos.close(); } return bos.toByteArray(); } }