Java File to Byte Array getBytesFromFile(File file)

Description

Return the contents of a file as a byte array.

License

Open Source License

Parameter

Parameter	Description
file	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static byte[] getBytesFromFile(File file) throws IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2013 "Ivo van Kamp"/*from www.  j a  va2 s. c  o m*/
 *
 * jEncrypt is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/

import java.io.*;

public class Main {
    /**
     * Return the contents of a file as a byte array.
     * 
     * @param file
     * @return
     * @throws IOException
     */
    public static byte[] getBytesFromFile(File file) throws IOException {

        if (file.length() > Integer.MAX_VALUE) {
            // File is too large
            throw new IOException("File '" + file.getName() + "' is bigger than Integer.MAX_VALUE (>2GB)");
        }
        InputStream in = new FileInputStream(file);

        // Create the byte array to hold the data
        byte[] bytes = new byte[(int) file.length()];

        int len = 0;

        // Reads bytes from the input stream and store them in buffer bytes
        len = in.read(bytes);

        // Ensure all the bytes have been read in
        if (len != bytes.length) {
            in.close();
            throw new IOException("Could not completely read file " + file.getName());
        }

        // Close the input stream and return bytes
        in.close();
        return bytes;
    }
}

Related

1. getBytes(File file)
2. getBytes(File file)
3. getBytes(File file)
4. getBytes(File file)
5. getBytesFromFile(File f)
6. getBytesFromFile(File file)
7. getBytesFromFile(File file)
8. getBytesFromFile(File file)
9. getBytesFromFile(File file)