Here you can find the source of getBytesFromFile(File file)
public static byte[] getBytesFromFile(File file) throws IOException
//package com.java2s; /******************************************************************************* * Copyright 2014 Miami-Dade County// w ww . j a va 2 s.co m * * 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.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; public class Main { public static byte[] getBytesFromFile(File file) throws IOException { return getBytesFromStream(new FileInputStream(file), true); } public static byte[] getBytesFromStream(InputStream is, boolean close) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); try { byte[] A = new byte[4096]; // Read in the bytes for (int cnt = is.read(A); cnt > -1; cnt = is.read(A)) out.write(A, 0, cnt); return out.toByteArray(); // Close the input stream and return bytes } finally { if (close) is.close(); } } }