Java Utililty Methods MD5 String

try {
    return MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
    throw new Error(e);

try {
    byte[] buf = new byte[1024];
    MessageDigest md = MessageDigest.getInstance("MD5");
    try (InputStream is = new FileInputStream(f); DigestInputStream dis = new DigestInputStream(is, md);) {
        while (dis.read(buf) >= 0)
            ;
    byte[] digest = md.digest();
...

MessageDigest md = null;
InputStream is = null;
try {
    md = MessageDigest.getInstance("MD5");
    is = new FileInputStream(f);
    is = new DigestInputStream(is, md);
    byte[] buffer = new byte[8192];
    while (is.read(buffer) != -1) {
...

try {
    byte[] b = Files.readAllBytes(f.toPath());
    byte[] hash = MessageDigest.getInstance("MD5").digest(b);
    return byteArrayToHex(hash);
} catch (NoSuchAlgorithmException e) {
    throw new IOException(e.getMessage(), e);

byte[] bytes = new byte[1024];
InputStream is = null;
try {
    MessageDigest md = MessageDigest.getInstance("MD5");
    is = new DigestInputStream(new FileInputStream(f), md);
    while ((is.read(bytes)) >= 0) {
    return hex(md.digest());
...

if (!file.exists()) {
    return null;
if (!file.isDirectory()) {
    return getMd5ByFile(file);
StringBuffer buf = new StringBuffer();
Stack<File> stack = new Stack<File>();
...

MessageDigest md = MessageDigest.getInstance("MD5");
FileInputStream fis = new FileInputStream(file);
byte[] dataBytes = new byte[1024];
int nread = 0;
while ((nread = fis.read(dataBytes)) != -1) {
    md.update(dataBytes, 0, nread);
fis.close();
...

MessageDigest md = MessageDigest.getInstance("MD5");
InputStream is = new FileInputStream(file);
is = new DigestInputStream(is, md);
byte[] buf = new byte[2048];
@SuppressWarnings("unused")
int read;
while ((read = is.read(buf)) != -1) {
is.close();
byte[] digest = md.digest();
return new BigInteger(1, digest).toString(16);

try {
    MessageDigest md5 = MessageDigest.getInstance("MD5");
    try (InputStream is = new BufferedInputStream(new FileInputStream(gcdZipFile))) {
        byte[] bytes = new byte[4 * 1024 * 1024];
        int len;
        while ((len = is.read(bytes)) >= 0) {
            md5.update(bytes, 0, len);
    return String.format("%032x", new BigInteger(1, md5.digest()));
} catch (NoSuchAlgorithmException e) {
    throw new IOException(e);

try {
    final InputStream fin = new FileInputStream(file);
    final MessageDigest md5 = MessageDigest.getInstance("MD5");
    byte[] buffer = new byte[1024];
    int read;
    while ((read = fin.read(buffer)) > 0) {
        md5.update(buffer, 0, read);
    fin.close();
    byte[] digest = md5.digest();
    if (digest == null)
        return null;
    String hash = "";
    for (int i = 0; i < digest.length; i++) {
        hash += Integer.toString((digest[i] & 0xff) + 0x100, 16).substring(1);
    return hash;
} catch (Exception e) {
    return null;