DuplicatedFiles.java 文件源码

private String sha2Of(File file) {
    if (file.length() > Integer.MAX_VALUE >> 2) {
        return sha2OfBigger(file);
    }

    try (FileChannel ch = new FileInputStream(file).getChannel()) {
        byte[] arry = new byte[1024 * 8];
        ByteBuffer byteBuffer = ByteBuffer.wrap(arry);

        int size = ch.read(byteBuffer);
        MessageDigest sha2 = MessageDigest.getInstance("SHA-256");
        while (size != -1) {
            sha2.update(arry, 0, size);
            byteBuffer.rewind();
            size = ch.read(byteBuffer);
        }
        return new HexBinaryAdapter().marshal(sha2.digest());
    } catch (IOException | NoSuchAlgorithmException e) {
        e.printStackTrace();
        return "\\";
    }
}