MD5

public class MD5 {

    public static String toMD5(String string) throws NoSuchAlgorithmException, 
            UnsupportedEncodingException {

        byte[] hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));
        StringBuilder hex = new StringBuilder(hash.length * 2);
        for (byte b : hash) {
            if ((b & 0xFF) < 0x10)
                hex.append("0");
            hex.append(Integer.toHexString(b & 0xFF));
        }

        return hex.toString();
    }
}