请教如何将C#的加密转成java，急需答案，谢谢

C#加密

public string MD5Base64(string input)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            return Convert.ToBase64String(md5.ComputeHash(UTF8Encoding.Default.GetBytes(input)));
}

需要把C#的这段加密在java中实现，怎么转成Java加密保证加密一样

public String getMD5(String s) {
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};        
        try {
            byte[] btInput = s.getBytes("utf-8");
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }