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HTML based file upload/download to FTP server using HttpHandler in C#

by Farooq Kaiser 24. December 2009 05:18

In this article, i will examined how to upload/download file from HTML client to FTP server using HttpHandler in C#. This approach can be very handy for application integration. Here is our html code that will consume HttpHandlers.

     
<html xmlns="http://www.w3.org/1999/xhtml" >

<head>

    <title>File Upload</title>

      <script type="text/javascript">
  

      function Download() {

                    document.location =  "FileDownload.ashx?Action=Jellyfish.jpg" ;    

                         }

        

</script>    

</head>

<body>

<form action="FileUpload.ashx" enctype="multipart/form-data" method="post">

    <input type="file" name="DataFile" id="DataFile" size="40" />

    <input type="submit" value="Upload" />

     <input type="button" id="download" value="Download" onclick="javascript:Download();" />   

    </form>

</body>

</html>

In next step, i will create HttpHandlers to upload/download file to FTP server.

File Upload Handler.

public class FileUpload : IHttpHandler

    {

  

        public void ProcessRequest(HttpContext context)

        {

  

           HttpPostedFile postedFile = context.Request.Files["DataFile"];

           byte[] buffer = ReadByte(postedFile.InputStream);

           string url = "ftp://FTPSERVER" + @"/" + postedFile.FileName;

  

           FtpWebRequest ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));

           ftpRequest.Credentials = new NetworkCredential("UserID", "Password");

           ftpRequest.Method = WebRequestMethods.Ftp.UploadFile;

           

           try

           {

               ftpRequest.GetRequestStream().Write(buffer, 0, buffer.Length);

           }

           catch (WebException e)

           {

               String status = ((FtpWebResponse)e.Response).StatusDescription;

           }

           

        }

  

        public static byte[] ReadByte(Stream input) 

        { 

            byte[] buffer = new byte[16 * 1024]; 

            using (MemoryStream ms = new MemoryStream()) 

            { int read; 

                while ((read = input.Read(buffer, 0, buffer.Length)) > 0) 

                { 

                    ms.Write(buffer, 0, read); 

                } 

                return ms.ToArray(); 

            } 

        }

  

  

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

    }

File Download Handler.

public class FileDownload : IHttpHandler

{

  

      public void ProcessRequest(HttpContext context)

      {

          string url = "ftp://FTPSERVER" + @"/" + context.Request.QueryString["Action"];

  

          FtpWebRequest ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(url));

          ftpRequest.Credentials = new NetworkCredential("UserID", "Password");

          ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;

          

          try

          {

              FtpWebResponse ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();

              Stream stream = ftpResponse.GetResponseStream();

              byte[] bytes = new byte[2048];

              int byteL = 0;

  

              using (MemoryStream mStream = new MemoryStream())

              {

                  do

                  {

                      byteL = stream.Read(bytes, 0, bytes.Length);

                      mStream.Write(bytes, 0, byteL);

                  }

                  while (byteL != 0);

  

                  context.Response.Clear();

                  context.Response.ClearHeaders();

                  context.Response.ClearContent();

                  context.Response.ContentType = "application/octet-stream";

                  context.Response.AddHeader("Content-Disposition", "attachment;filename=" + context.Request.QueryString["Action"]);

                  context.Response.BinaryWrite(mStream.GetBuffer());

              }

          }

          catch

          {

          }

      }

  

      public bool IsReusable

      {

          get

          {

              return false;

          }

      }

  }

Summary

In this article, we examined how to upload/download file from HTML client to FTP server using HttpHandler in C#.

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Tags: c#, httphandler, download, upload, ftp

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HTML based file upload/download to FTP server using HttpHandler in C#

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