// 设置加密模式为AES的CBC模式

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");

            SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");

            IvParameterSpec iv = new IvParameterSpec(aesKey, 0, 16);

            cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);

            // 加密

            byte[] encrypted = cipher.doFinal(unencrypted);

...

cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);