如何在 C# 中将字符串数据作为 ZIP 存档上传到 FTP 服务器

Question

这是我的代码。我想 export/upload 这个 .dat 文件压缩成 zip 格式到 FTP 服务器。我尝试了很多但没有找到任何解决方案。谁能帮我解决这个问题。

public string ExportVoid(FileSetups fileSetup, HttpPostedFileBase file)
{
    var sb = new System.Text.StringBuilder();

    var list = _context.VOIDS.ToList();
  
    foreach (var item in list)
    {
        sb.AppendFormat("{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}\r", item.Date, item.Time, item.Shift, item.EmployeeID, item.Amount, item.Items, item.DrawerOpen, item.Postpone, item.LocationID);
    }
    System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
   
    WebClient myWebClient = new WebClient();
    var dbftp = _context.FileSetup.SingleOrDefault();
    var a = dbftp.FTP;
    var v = Session["ClientId"];
    var d = DateTime.Now.ToString("MM_dd_yyyy_hh:mm:ss");
    string uriString = "ftp://MyFTP.com/Files/" + "Void" + ".dat";
    myWebClient.Credentials = new NetworkCredential("userName", "password");
    //Console.WriteLine("\nPlease enter the data to be posted to the URI {0}:", uriString);
    string postData = sb.ToString();
    // Apply ASCII Encoding to obtain the string as a byte array.
    byte[] postArray = Encoding.ASCII.GetBytes(postData);

    myWebClient.Headers.Add("Content-Disposition", "attachment; filename=" + "Void.dat");
    
    byte[] responseArray = myWebClient.UploadData(uriString, postArray);

    return "Export Successfully!";
}

Answer 1

据我了解，您想将 StringBuilder 的内容保存到 .dat 文件中。然后您想将 .dat 文件压缩为 .zip 文件。最后，您想将 .zip 文件发送到 FTP 服务器。

尝试这样的事情：

public string ExportVoid(FileSetups fileSetup, HttpPostedFileBase file)
{
    var sb = new System.Text.StringBuilder();

    var list = _context.VOIDS.ToList();

    foreach (var item in list)
    {
        sb.AppendFormat("{0}\t{1}\t{2}\t{3}\t{4}\t{5}\t{6}\t{7}\t{8}\r", item.Date, item.Time, item.Shift, item.EmployeeID, item.Amount, item.Items, item.DrawerOpen, item.Postpone, item.LocationID);
    }
    System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;

    string zipFileName = "my_file.zip";
    string datFileName = "my_file.dat";
    string destinationFolder = @"c:\destinationFolder";
    string sourceFolder = @"c:\sourceFolder";
    string ftpDestinationPath = "ftp://1.2.3.4/my_file.zip";

    //Create .dat file with the StringBuilder content.
    File.WriteAllText(Path.Combine(sourceFolder, datFileName), sb.ToString());

    //Create .zip file containing the .dat file
    ZipFile.CreateFromDirectory(sourceFolder, Path.Combine(destinationFolder, zipFileName));

    //Send file to FTP server
    FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftpDestinationPath);
    request.Method = WebRequestMethods.Ftp.UploadFile;

    request.Credentials = new NetworkCredential("userName", "password");

    byte[] fileContents;
    using (StreamReader sourceStream = new StreamReader(Path.Combine(destinationFolder, zipFileName)))
    {
        fileContents = File.ReadAllBytes(Path.Combine(destinationFolder, zipFileName));
    }

    request.ContentLength = fileContents.Length;

    using (Stream requestStream = request.GetRequestStream())
    {
        requestStream.Write(fileContents, 0, fileContents.Length);
    }

    using (FtpWebResponse ftpResponse = (FtpWebResponse)request.GetResponse()
    {
        return "Export Successfully!";
    }
}

Answer 2

如果您想压缩内存中的字符串 (postData) 并将压缩文件上传到 FTP 服务器，您可以使用：

using (var memoryStream = new MemoryStream())
{
    using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
    {
        // Repeat this block, if you want to add more files
        ZipArchiveEntry entry = archive.CreateEntry("void.dat");

        using (Stream entryStream = entry.Open())
        using (var writer = new StreamWriter(entryStream, Encoding.UTF8))
        {
            writer.Write(postData);
        }
    }

    memoryStream.Seek(0, SeekOrigin.Begin);

    var request = WebRequest.Create("ftp://ftp.example.com/remote/path/archive.zip");
    request.Credentials = new NetworkCredential("username", "password");
    request.Method = WebRequestMethods.Ftp.UploadFile;
    using (Stream ftpStream = request.GetRequestStream())
    {
        memoryStream.CopyTo(ftpStream);
    }
}

如果文本很小，内存占用无关紧要，您可以将上传代码（从memoryStream.Seek到最后的所有内容）简化为：

    var client = new WebClient();
    client.Credentials = new NetworkCredential("username", "password");
    client.UploadData(
        "ftp://ftp.example.com/remote/path/archive.zip", memoryStream.ToArray());

基于Zip a directory and upload to FTP server without saving the .zip file locally in C#。

您关于相反操作的相关问题：

如何在 C# 中将字符串数据作为 ZIP 存档上传到 FTP 服务器

How to upload a string data as a ZIP archive to an FTP server in C#

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