當麻許的碎念筆記

<form action = "http://192.168.1.100/uploadFile.jsp"
method="post" enctype="multipart/form-data">
Desc : <input type="text" name="iptDesc">
<br>
<input type="file" name="uploadFileName" />
<input type="submit" value="上傳" />
</form>

/// <summary>

/// 上傳檔案至 Server 透過HttpWebRequest

/// </summary>

/// <param name="url">上傳網址</param>

/// <param name="file">檔案位置</param>

/// <param name="paramName">該control name</param>

/// <param name="contentType">image type </param>

/// <param name="nvc">其他參數</param>

/// <returns></returns>

public string UploadFileByHttpWebRequest(string url, string file, string paramName, string contentType, NameValueCollection nvc)

{

   // Debug.WriteLine(string.Format("上傳至 {0} to {1}", file, url));

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

    byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

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

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

    wr.Method = "POST";

    wr.KeepAlive = true;

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

    Stream rs = wr.GetRequestStream();

    string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";

    foreach (string key in nvc.Keys)

    {

        rs.Write(boundarybytes, 0, boundarybytes.Length);

        string formitem = string.Format(formdataTemplate, key, nvc[key]);

        byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);

        rs.Write(formitembytes, 0, formitembytes.Length);

    }

    rs.Write(boundarybytes, 0, boundarybytes.Length);

    string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";

    string header = string.Format(headerTemplate, paramName, file, contentType);

    byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);

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

    FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);

    byte[] buffer = new byte[4096];

    int bytesRead = 0;

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

    {

        rs.Write(buffer, 0, bytesRead);

    }

    fileStream.Close();

    byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");

    rs.Write(trailer, 0, trailer.Length);

    rs.Close();

    WebResponse wresp = null;

    var result = "";

    try

    {

        wresp = wr.GetResponse();

        Stream stream2 = wresp.GetResponseStream();

        StreamReader reader2 = new StreamReader(stream2);

        //成功回傳結果

        result = reader2.ReadToEnd();

        //File.WriteAllText(Server.MapPath("log.txt"), string.Format("Server 回應{0}", reader2.ReadToEnd()));

    }

    catch (Exception ex)

    {

       // File.WriteAllText(Server.MapPath("log.txt"), string.Format("上傳失敗，錯誤訊息: {0}", ex.Message));

        if (wresp != null)

        {

            wresp.Close();

        }

    }

    wr = null;

    return result; 

}

///增加其他參數

NameValueCollection nvc = new NameValueCollection();

nvc.Add("iptDesc", "我是敘述");

//上傳檔案

var result = UploadFileByHttpWebRequest("http://192.168.1.100/uploadFile.jsp",

    Server.MapPath("sample3.jpg"), "uploadFileName", "image/jpeg", nvc);

//回傳結果

Response.Write(result);