你要了解 RFC2188 协议以及后续的扩展协议，你提交的 body 数据格式要符合人家的规范。

引用 1 楼 sp1234 的回复:

你要了解 RFC2188 协议以及后续的扩展协议，你提交的 body 数据格式要符合人家的规范。

这是我httpwatch抓到的东西
POST /web/scc/sflow/distributetask/distributeTask.do?action=saveAndSend HTTP/1.1
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/xaml+xml, application/x-ms-xbap, application/x-ms-application, */*
Referer: http://10.158.249.36/web/scc/sflow/distributetask/distributeTask.do?action=init&activity=sgcsc002&processType=109&processNo=10903&appNo=141127765087&taskID=315649188&orgNo=3740403&actName=%E5%9C%B0%E5%B8%82%E6%8E%A5%E5%8D%95%E6%B4%BE%E5%B7%A5
Accept-Language: zh-cn
Content-Type: multipart/form-data; boundary=---------------------------7de1863814700f2
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E)
Host: 10.158.249.36
Content-Length: 2383
Connection: Keep-Alive
Cache-Control: no-cache
Cookie: logonUsername=88882; ZP_CAL=%27fdow%27%3Anull%2C%27history%27%3A%222014/11/26/23/59%2C2014/11/26/23/59%2C2014/12/26/23/59%2C2014/12/27/23/59%2C2014/11/26/00/00%2C2014/11/27/00/00%2C2014/11/27/00/00%2C2014/11/26/00/00%2C2014/11/26/00/00%22%2C%27sortOrder%27%3A%22asc%22%2C%27hsize%27%3A9; JSESSIONID=vyvLJ2yL3nTvpGsXY10n7rXnbq6TFvwGsNMrfQkvX9bTJFhL7DZw!2142538846

-----------------------------7de1863814700f2
Content-Disposition: form-data; name="siteTypeCode"

02
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="appointReason"


-----------------------------7de1863814700f2
Content-Disposition: form-data; name="bookingTime"


-----------------------------7de1863814700f2
Content-Disposition: form-data; name="acceptTime"

2014-11-27 09:17
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="appNo"

141127765087
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="taskId"

315649188
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="vheicleId"


-----------------------------7de1863814700f2
Content-Disposition: form-data; name="reapairEmpNoName"

瀛熷簞鎶慨缁?
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="reapairEmpNo"

瀛熷簞鎶慨缁?
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="repairOrg"

374040304
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="repairDeptNo"

0001488348
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="dispachTime"

2014-11-27 09:17:47
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="normalOpinion"

5050074696
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="handleOpinion"

璇峰鐞嗭紝骞舵寜銆婃灒搴勫叕鍙?5598涓氬姟宸ュ崟濉啓鎵嬪唽銆嬭繘琛屽弽棣堣澶勭悊
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="wkstAttach.contentFile"; filename=""
Content-Type: application/octet-stream


-----------------------------7de1863814700f2
Content-Disposition: form-data; name="forkValue"

鏁呴殰澶勭悊
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="flowHandleDept"

0010924641
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="isSmsNotice"

1
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="orgNo"

3740403
-----------------------------7de1863814700f2
Content-Disposition: form-data; name="countyCode"

370402
-----------------------------7de1863814700f2--

cookie   postdata数据都拿到了   就是不知道 提交数据编码

一般用 UTF-8就行了。 

应该是你生成的数据有问题了，可以参考一下这个链接


http://blog.csdn.net/flymorn/article/details/6769722

http://www.telerik.com/fiddler/add-ons

有fiddler抓，然后在这里下个配套的代码生成器，直接把请求拖到code页就帮你生成代码了

光有错误信息，看不出多少门道啊，不如贴上部分代码

是不是多了两个－－，之前我也弄这个东西，估计是那个－号的问题。多一个少一个都不行，你捉个标准的对比一下吧

boundary=---------------------------7de1863814700f2
这个是动态的，请求了几次这个值都不一样

 public static bool HttpPostS(string url, string postdata, string referer, string boundary)

        {

            bool st = true;

            try

            {

                string result = "";

                CookieContainer cCurrent = new CookieContainer();

                Uri u = new Uri(url);

                cCurrent.Add(u, new Cookie("JSESSIONID", jsessionId));

                cCurrent.Add(u, new Cookie("logonUsername", XF_Main.UserName));

                //if (P3p != null)

                //{

                //    cCurrent.Add(u, new Cookie("P3P", P3p));

                //}                       

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);



                var memStream = new MemoryStream();

                // 边界符

                var beginBoundary = Encoding.ASCII.GetBytes("--" + "---------------------------" + boundary + "\r\n");

                var fileStream = new FileStream(Application.StartupPath+@"\file.dat", FileMode.Open, FileAccess.Read);

                // 最后的结束符

                var endBoundary = Encoding.ASCII.GetBytes("--" + "---------------------------" + boundary + "--\r\n");

                

                //设置属性

                request.Headers.Clear();

                request.Method = "POST";//必须为大写，不然会出错   

                //request.Headers.Add("headName", HttpUtility.UrlEncode("value"));

                request.ContentType = "multipart/form-data; boundary=---------------------------" + boundary;//

                request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/xaml+xml, application/x-ms-xbap, application/x-ms-application, */*";

                request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E)";



                XF_Main.WriteErrorLog(referer);

                //new NameValueCollection()

                //request.ContentLength = data.Length;

                request.Referer = referer;

                request.AllowAutoRedirect = true;

                request.KeepAlive = true;

                request.CookieContainer = cCurrent;

                request.Timeout = 6000;    //超时时间            

                XF_Main.WriteErrorLog("3");

                //写入上传文件

                string filePartHeader = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n" + "Content-Type: text/plain\r\n\r\n";

                var header = string.Format(filePartHeader, "wkstAttach.contentFile", Application.StartupPath + @"\file.dat");

                var headerbytes = Encoding.UTF8.GetBytes(header);



                memStream.Write(beginBoundary, 0, beginBoundary.Length);

                memStream.Write(headerbytes, 0, headerbytes.Length);



                var buffer = new byte[1024];

                int bytesRead; // =0

                XF_Main.WriteErrorLog("4");

                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)

                {

                    memStream.Write(buffer, 0, bytesRead);

                }

                memStream.Write(Encoding.UTF8.GetBytes(postdata), 0, Encoding.UTF8.GetBytes(postdata).Length);



                // 写入最后的结束边界符

                memStream.Write(endBoundary, 0, endBoundary.Length);



                request.ContentLength = memStream.Length;

                XF_Main.WriteErrorLog("5");

                //UTF8Encoding encoding = new UTF8Encoding();

                //ASCIIEncoding encoding = new ASCIIEncoding();



                //byte[] data = encoding.GetBytes(postdata);//post 方式的编码    

                //byte[] data = Encoding.UTF8.GetBytes(postdata);//post 方式的编码    

                //XF_Main.WriteErrorLog("21");

                //request.Headers.Clear();

                //request.ServicePoint.ConnectionLimit

              

                //request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E)";

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

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

                //request.Accept = "application/x-shockwave-flash, image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/msword, application/vnd.ms-excel, application/vnd.ms-powerpoint, */*";

                //request.Host = "10.158.249.36";

                

                //request.PreAuthenticate = true;

                //request.Credentials = CredentialCache.DefaultCredentials;               

                

                //XF_Main.WriteErrorLog("3");

                //提交请求

                stream = request.GetRequestStream();



                memStream.Position = 0;

                var tempBuffer = new byte[memStream.Length];

                memStream.Read(tempBuffer, 0, tempBuffer.Length);

                memStream.Close();

                

                stream.Write(tempBuffer, 0, tempBuffer.Length);

                stream.Close();



                //接收                

                HttpWebResponse response = (HttpWebResponse)request.GetResponse(); //XF_Main.WriteErrorLog("4");

                if (response.StatusCode != HttpStatusCode.OK)

                    return false;



                //StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"));

                //StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

                StreamReader streamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);

                result = streamReader.ReadToEnd();

                request.Abort();

                response.Close();

                streamReader.Close();

                cCurrent = null;



                return st;

            }

            catch (Exception ex) { XF_Main.WriteErrorLog(ex.Message + "\r\n" + ex.StackTrace); st = false; return false; } return st;

        }



public static string GetMultipartData(string postdata, string boundary)

        {            

            array = postdata.Split('&');

            datas = new StringBuilder();

            foreach (string str in array)

            {

                string[] arr = str.Split('=');

                //if (str.Contains("wkstAttach"))

                //    datas.AppendFormat("-----------------------------{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"\"\r\nContent-Type: application/octet-stream\r\n\r\n{2}\r\n", boundary, arr[0], arr[1]);

                //else

                datas.AppendFormat("-----------------------------{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}\r\n", boundary, arr[0], arr[1]);                                    

            }

            datas.AppendFormat("-----------------------------{0}--\r\n", boundary);

            return datas.ToString();

        }

这是部分代码   

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

  这是我生成的  boundary  是不是跟网站上的不一样导致的