生成PDF下载 HTTP或FTP远程获取PDF

这个只是些代码片断。  备用。希望也能对大家有用。

down.ashx.cs

public   void  ProcessRequest(HttpContext context)
     {
      string title = sui.Title;
      string su = sui.SourceUrl;  //全文下载链接地址
      
      context.Response.Clear();
      context.Response.ContentType = "application/pdf";
      context.Response.ContentEncoding = Encoding.UTF8;
      context.Response.Charset = "utf-8";
      context.Response.AddHeader("Content-Disposition", "attachment; filename=" +HttpUtility.UrlEncode(title+".pdf",Encoding.UTF8));
      if (su.Contains("ftp"))
      {
        string userName = "";
        string password = "";
        FtpDownload(context, su, userName, password);
      }
      else
      {        
        HttpDownload(context, su);
      }
    }

     private   static   void  FtpDownload(HttpContext context,  string  fileUrl,  string  userName,  string  password)
     {
      try
      {
        byte[] result;
        byte[] buffer = new byte[4096];

        Uri filepath = new Uri(fileUrl);

        FtpWebRequest reqFTP = (FtpWebRequest)FtpWebRequest.Create(filepath);

        reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

        reqFTP.UseBinary = true;

        reqFTP.Credentials = new NetworkCredential(userName, password);

        using (FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse())
        {
          using (Stream responseStream = response.GetResponseStream())
          {
            using (MemoryStream memoryStream = new MemoryStream())
            {
              int count = 0;
              do
              {
                count = responseStream.Read(buffer, 0, buffer.Length);
                memoryStream.Write(buffer, 0, count);

              } while (count != 0);

              result = memoryStream.ToArray();

              HttpContext.Current.Response.AddHeader("Content-Length", result.Length.ToString());
              memoryStream.WriteTo(context.Response.OutputStream);
              memoryStream.Close();
              context.Response.OutputStream.Flush();
              context.Response.Flush();
            }
          }
        }
      }
      catch (Exception ex)
      {
        Exceptions.LogException(ex);
      }
    }

     private   static   void  HttpDownload(HttpContext context,  string  httpUrl)
     {
      try
      {
        byte[] buffer = new byte[4096];

        HttpWebRequest reqHTTP = (HttpWebRequest)WebRequest.Create(httpUrl);

        using (HttpWebResponse response = (HttpWebResponse)reqHTTP.GetResponse())
        {
          using (Stream responseStream = response.GetResponseStream())
          {
            using (MemoryStream memoryStream = new MemoryStream())
            {
              int count = 0;
              do
              {
                count = responseStream.Read(buffer, 0, buffer.Length);
                memoryStream.Write(buffer, 0, count);
              } while (count != 0);

              byte[] result = memoryStream.ToArray();
              HttpContext.Current.Response.AddHeader("Content-Length", result.Length.ToString());
              memoryStream.WriteTo(context.Response.OutputStream);
              memoryStream.Close();
              context.Response.OutputStream.Flush();
              context.Response.Flush();

            }
          }
        }
      }
      catch (Exception ex)
      {
        Exceptions.LogException(ex);
      }
    }