/**
 * Returns the contents of the file in a byte array
 * @param file File this method should read
 * @return byte[] Returns a byte[] array of the contents of the file
 */
public static byte[] getBytesFromFile(File file) throws IOException {
 
    InputStream is = new FileInputStream(file);
    System.out.println("\nDEBUG: FileInputStream is " + file);
 
    // Get the size of the file
    long length = file.length();
    System.out.println("DEBUG: Length of " + file + " is " + length + "\n");
 
    /*
     * You cannot create an array using a long type. It needs to be an int
     * type. Before converting to an int type, check to ensure that file is
     * not loarger than Integer.MAX_VALUE;
     */
    if (length > Integer.MAX_VALUE) {
        System.out.println("File is too large to process");
        return null;
    }
 
    // Create the byte array to hold the data
    byte[] bytes = new byte[(int)length];
 
    // Read in the bytes
    int offset = 0;
    int numRead = 0;
    while ((offset < bytes.length) && ((numRead=is.read(bytes, offset, bytes.length-offset)) >= 0)) {
        offset += numRead;
    }
 
    // Ensure all the bytes have been read in
    if (offset < bytes.length) {
        throw new IOException("Could not completely read file " + file.getName());
    }
 
    is.close();
    return bytes;
}

URL u = new URL("MY URL");
HttpURLConnection uc = (HttpURLConnection) u.openConnection();
String contentType = uc.getContentType();
int contentLength = uc.getContentLength();
if (contentType.startsWith("text/") || contentLength == -1) {
    throw new IOException("This is not a binary file.");
}
InputStream raw = uc.getInputStream();
InputStream in = new BufferedInputStream(raw);
byte[] data = new byte[contentLength];
int bytesRead = 0;
int offset = 0;
while (offset < contentLength) {
    bytesRead = in.read(data, offset, data.length - offset);
    if (bytesRead == -1) break;
    offset += bytesRead;
}
in.close();