private static final String CIPHER_ALGORITHM_AES_ECB = "AES/ECB/PKCS5Padding"
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_AES_ECB);
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), KEY_ALGORITHM_AES));
byte[] encryptContentBytes = cipher.doFinal(contentBytes);