HttpWebRequest上传文件到java的接口，一直显示参数异常，和解

HttpWebRequest上传文件到java的接口，一直显示参数错误，和解？
HttpWebRequest上传文件到java的接口，一直显示参数错误，和解？
java的接口那边有个 upload 是用于存放文件流的。

responseData = HttpHelper.UploadFileHttpRequest(loginurl, para, "application/x-www-form-urlencoded", path + "\\" + fname, "application/octet-stream", posturl);

#region HttpWebRequest上传文件

        /// <summary>

        /// 利用HttpWebRequest上传文件

        /// </summary>

        /// <param name="loginurl">登录验证接口URL</param>

        /// <param name="loginbody"></param>

        /// <param name="logincontentType"></param>

        /// <param name="filename">文件名称</param>

        /// <param name="filetype">文件类型PostedFile.ContentType</param>

        /// <param name="posturl">接收文件的接口URL</param>

        /// <returns></returns>

        public static string UploadFileHttpRequest(string loginurl, string loginbody, string logincontentType, string filename, string filetype, string posturl)

        {

            HttpWebRequest uploadRequest = null;


            #region 登录

            uploadRequest = (HttpWebRequest)WebRequest.Create(loginurl);

            uploadRequest.ContentType = logincontentType;

            uploadRequest.Method = "POST";

            uploadRequest.Timeout = 1000 * 60;

            uploadRequest.CookieContainer = mycookie;


            byte[] btBodys = Encoding.UTF8.GetBytes(loginbody);

            uploadRequest.ContentLength = btBodys.Length;

            uploadRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);


            HttpWebResponse httpWebResponse = (HttpWebResponse)uploadRequest.GetResponse();

            StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());

            string responseContent = streamReader.ReadToEnd();


            httpWebResponse.Cookies = mycookie.GetCookies(uploadRequest.RequestUri);//获取一个包含url的cookie集合的cookiecollection  


            #endregion


            //边界

            string boundary = DateTime.Now.Ticks.ToString("x");

            uploadRequest = (HttpWebRequest)WebRequest.Create(posturl);//url为上传的地址

            uploadRequest.ContentType = "application/octet-stream; boundary=" + boundary;

            uploadRequest.Method = "POST";

            uploadRequest.Accept = "*/*";

            uploadRequest.KeepAlive = true;

            uploadRequest.CookieContainer = mycookie;

            //uploadRequest.Headers.Add("Accept-Language", "zh-cn");

            //uploadRequest.Headers.Add("Accept-Encoding", "gzip, deflate");

            uploadRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;

            uploadRequest.Headers["Cookie"] = mycookie.ToString();//上传文件时需要的cookies


            WebResponse reponse;


            //创建一个内存流

            Stream memStream = new MemoryStream();


            //确定上传的文件路径