刚实习的时候遇到一个问题：上传文件的URL有特定格式限制，需要按格式定义头信息，才能上传成功。查资料时候当时好像是java版本的，C#代码贴上。

//uploadFile：上传文件名    groupId：GUIDpublic string FileUpload(string uploadFile, string groupId){    //从流中读取字节块并将该数据写入给定缓冲区buffer中    FileStream fileStream = new FileStream(uploadFile, FileMode.Open, FileAccess.Read);    Byte[] buffer = new Byte[fileStream.Length];    fileStream.Read(buffer, 0, Convert.ToInt32(fileStream.Length));    //boundary setting     string boundary = "----------" + DateTime.Now.Ticks.ToString("x");    string fileName = Path.GetFileName(uploadFile);    string nameOnly = fileName.Substring(0, fileName.LastIndexOf("."));    Dictionary
     
       Params = new Dictionary
      
       ();    Params.Add("name", fileName);    Params.Add("groupId", groupId);    Params.Add("appModule", "portal");    Params.Add("filePath", "");    Params.Add("thumbnail", "true");    Params.Add("storeType", "1");    Params.Add("property1", "");    Params.Add("property2", "");    Params.Add("property3", "");    Params.Add("property4", "");    Params.Add("property5", "");    Params.Add("flag", "false");    StringBuilder sb = new StringBuilder();    //发送必要字段    foreach (KeyValuePair
       
         param in Params)    {        sb = sb.Append("--");        sb = sb.Append(boundary);        sb = sb.Append("\r\n");        sb = sb.Append("Content-Disposition: form-data; name=\"" + param.Key + "\"\r\n\r\n");        sb = sb.Append(param.Value);        sb = sb.Append("\r\n");    }    //要发送的文件    sb = sb.Append("--");    sb = sb.Append(boundary);    sb = sb.Append("\r\n");    sb = sb.Append("Content-Disposition: form-data; name=\"" + nameOnly + "\"; filename=\"" + fileName + "\"\r\n");    sb = sb.Append("Content-Type: application/octet-stream\r\n\r\n");    byte[] data = Encoding.Default.GetBytes(sb.ToString());    byte[] end_data = Encoding.Default.GetBytes(("\r\n--" + boundary + "--\r\n"));    Uri uri = new Uri("上传文件地址");    HttpWebRequest webRequset = (HttpWebRequest)WebRequest.Create(uri);    webRequset.ContentType = "multipart/form-data; boundary=" + boundary;    webRequset.Method = "POST";        //长度属性：头+文件流+尾的长度    long length = data.Length + buffer.Length + end_data.Length;    webRequset.ContentLength = length;    Stream requestStream = webRequset.GetRequestStream();    //将拼接的数据和文件流写入    requestStream.Write(data, 0, data.Length);    requestStream.Write(buffer, 0, buffer.Length);    requestStream.Write(end_data, 0, end_data.Length);    //获取返回信息    WebResponse responce = webRequset.GetResponse();    Stream responeStream = responce.GetResponseStream();    StreamReader sr = new StreamReader(responeStream);    return sr.ReadToEnd();}