/**
     * Writes an byte array into a file.
     * @param data Data that should be written into a file.
     * @param filename The file, that should be used.
     * @throws IOException
     */
    public static void writeByte2File(byte[] data, String filename) throws IOException {
        OutputStream out = new FileOutputStream(filename);
        out.write(data);
        out.close();
    }

byte-Array to File

Java