如何从特定文件夹的 ftp 下载文件

Question

我创建了一个 Windows 窗体来从特定文件夹的 ftp 下载文件。

用户将 ftp 详细信息与用户名和密码以及将从该文件下载所有文件的文件夹名称一起输入。这将由用户设置一次，并且每天都会下载 ftp describe 文件夹中的所有文件。
FTP 文件夹名称的示例是 MyFolder，其中 a.docx、b.docx 等它将每天下载 a.docx、b.docx，而不需要下载其他文件夹数据。

对于下载和文件列表，我使用以下功能。你能告诉我我做错了什么或者我该怎么做。

 private void downloadFileFromFTP()
 {
    try
    {
        string[] files = GetFileList();
        foreach (string file in files)
        {
            Download(file);
        }
    }
    catch (Exception ex)
    {
    }
}

获取文件列表

public string[] GetFileList()
{
    string[] downloadFiles;
    StringBuilder result = new StringBuilder();
    WebResponse response = null;
    StreamReader reader = null;
    try
    {
        FtpWebRequest reqFTP;
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri( "ftp://" + txtftpAddress.Text + "/")); //txtFtpAddress.Text + "/" + txtFTPFolderName + "/" + file
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential("UserNm", "passwd");
        reqFTP.Method = WebRequestMethods.Ftp .ListDirectory;
        reqFTP.Proxy = null;
        reqFTP.KeepAlive = false;
        reqFTP.UsePassive = false;
        response = reqFTP.GetResponse();
        reader = new StreamReader(response.GetResponseStream());
        string line = reader.ReadLine();
        while (line != null)
        {
            result.Append(line);
            result.Append("\n");
            line = reader.ReadLine();
        }
        // to remove the trailing '\n'
        result.Remove(result.ToString().LastIndexOf('\n'), 1);
        return result.ToString().Split('\n');
    }
    catch (Exception ex)
    {
        if (reader != null)
        {
            reader.Close();
        }
        if (response != null)
        {
            response.Close();
        }
        downloadFiles = null;
        return downloadFiles;
    }
}

从文件夹下载文件

private void Download(string file)
{                       
    try
    {                             
        string uri = "ftp://" + txtFtpAddress.Text.Trim() + "/" + "txtlodername.Text" + "/" + file;

        Uri serverUri = new Uri(uri);
        if (serverUri.Scheme != Uri.UriSchemeFtp)
        {
            return;
        }       
        FtpWebRequest reqFTP;                
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(txtFtpAddress.Text + "/" + txtFTPFolderName + "/" + file));                                
        reqFTP.Credentials = new NetworkCredential("UserName", "mypass");                
        reqFTP.KeepAlive = false;                
        reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;                                
        reqFTP.UseBinary = true;
        reqFTP.Proxy = null;                 
        reqFTP.UsePassive = false;
        FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
        Stream responseStream = response.GetResponseStream();
        FileStream writeStream = new FileStream("D\\Temp"  + file, FileMode.Create);                
        int Length = 2048;
        Byte[] buffer = new Byte[Length];
        int bytesRead = responseStream.Read(buffer, 0, Length);               
        while (bytesRead > 0)
        {
            writeStream.Write(buffer, 0, bytesRead);
            bytesRead = responseStream.Read(buffer, 0, Length);
        }                
        writeStream.Close();
        response.Close(); 
    }
    catch (WebException wEx)
    {
        MessageBox.Show(wEx.Message, "Download Error");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Download Error");
    }
}

Answer 1

我认为你的 Download 方法的 3 行必须更正如下：

1.

string uri = "ftp://" + txtFtpAddress.Text.Trim() + "/" + "txtlodername.Text" + "/" + file;

应该是：

string uri = "ftp://" + txtFtpAddress.Text.Trim() + "/" + txtFTPFolderName.Text.Trim() + "/" + file;

2.

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(txtFtpAddress.Text + "/" + txtFTPFolderName + "/" + file));

应该是：

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(uri));

3.

FileStream writeStream = new FileStream("D\\Temp"  + file, FileMode.Create);  

应该是：

FileStream writeStream = new FileStream("D:\\Temp\\"  + file, FileMode.Create);