【求助】关于.net和java中，AES加密互通问题

[love__nana]

我们对接一个.net平台，我们用的是java，对方只有.net的demo，现在要进行AES加密和解密，但一直不能互通
现在贴出.net的版本，哪位全栈大神可以帮忙转换成java的

/// <summary>
        /// AES加密
        /// </summary>
        /// <param name="plainStr">明文字符串</param>
        /// <returns>密文</returns>
        public static string AESEncrypt(string plainStr , string key,string IV)
        {
            byte[] bKey = Encoding.UTF8.GetBytes(key);
            byte[] bIV = Encoding.UTF8.GetBytes(IV);
            //获取16位向量
            byte[] ivKey = new byte[16];
            int len = bIV.Length;
            if (len > ivKey.Length) len = ivKey.Length;
            System.Array.Copy(bIV, ivKey, len);
            
            byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);

            string encrypt = null;
            Rijndael aes = Rijndael.Create();
                using (MemoryStream mStream = new MemoryStream())
                {
                    using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, ivKey), CryptoStreamMode.Write))
                    {
                        cStream.Write(byteArray, 0, byteArray.Length);
                        cStream.FlushFinalBlock();
                        encrypt = Convert.ToBase64String(mStream.ToArray());
                    }
                }
            aes.Clear();

            return encrypt;
        }

        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="showText">密文字符串</param>
        /// <returns>返回解密后的明文字符串</returns>
        public static string AESDecrypt(string showText, string key, string IV)
        {
            byte[] cipherText = Convert.FromBase64String(showText);

            SymmetricAlgorithm des = Rijndael.Create();
            des.Key = Encoding.UTF8.GetBytes(key);

            byte[] bIV = Encoding.UTF8.GetBytes(IV);
            //获取16位向量
            byte[] ivKey = new byte[16];
            int len = IV.Length;
            if (len > ivKey.Length) len = ivKey.Length;
            System.Array.Copy(bIV, ivKey, len);
            des.IV = ivKey;
            byte[] decryptBytes = new byte[cipherText.Length];
            using (MemoryStream ms = new MemoryStream(cipherText))
            {
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read))
                {
                    cs.Read(decryptBytes, 0, decryptBytes.Length);
                    cs.Close();
                    ms.Close();
                }
            }
            return Encoding.UTF8.GetString(decryptBytes).Replace("\0", "");   ///将字符串后尾的'\0'去掉
        }
    }