• C#遍历FTP文件夹/下载


    原文链接:http://blog.csdn.net/ou8811/article/details/5295780

     

    整个程序大致可以分为2个部分,第一部分是实现单个文件下载的方法 

    [c-sharp] view plaincopy
    /// <summary>  
    /// 单个文件下载方法  
     /// </summary>  
    /// <param name="adss">保存文件的本地路径</param>  
    /// <param name="ftpadss">下载文件的FTP路径</param>  
    public void download(string adss, string ftpadss)  
    {  
        //FileMode常数确定如何打开或创建文件,指定操作系统应创建新文件。  
        //FileMode.Create如果文件已存在,它将被改写  
        FileStream outputStream = new FileStream(adss, FileMode.Create);  
        FtpWebRequest downRequest = (FtpWebRequest)WebRequest.Create(new Uri(ftpadss));  
        //设置要发送到 FTP 服务器的命令  
        downRequest.Method = WebRequestMethods.Ftp.DownloadFile;  
        FtpWebResponse response = (FtpWebResponse)downRequest.GetResponse();  
        Stream ftpStream = response.GetResponseStream();  
        long cl = response.ContentLength;  
        int bufferSize = 2048;  
        int readCount;  
        byte[] buffer = new byte[bufferSize];  
        readCount = ftpStream.Read(buffer, 0, bufferSize);  
        while (readCount > 0)  
        {  
            outputStream.Write(buffer, 0, readCount);  
            readCount = ftpStream.Read(buffer, 0, bufferSize);  
        }  
        ftpStream.Close();  
        outputStream.Close();  
        response.Close();  
    }  
    

      

      第二个部分也就是需要遍历出我们所指定的文件夹内所有内容 

      首先是一个单个遍历文件夹获取文件夹下所有文件信息的方法  

    [c-sharp] view plaincopy
    /// </summary>  
    /// <param name="ftpads">FTP地址路径</param>  
    /// <param name="name">我们所选择的文件或者文件夹名字</param>  
    /// <param name="type">要发送到FTP服务器的命令</param>  
    /// <returns></returns>  
    public string[] ftp(string ftpads,string name,string type)  
    {  
        WebResponse webresp = null;  
        StreamReader ftpFileListReader = null;  
        FtpWebRequest ftpRequest=null;  
        try  
        {  
             ftpRequest = (FtpWebRequest)WebRequest.Create(new Uri(ftpads + name));  
             ftpRequest.Method = type;  
             webresp = ftpRequest.GetResponse();  
             ftpFileListReader = new StreamReader(webresp.GetResponseStream(), Encoding.Default);  
        }  
        catch(Exception ex)  
        {  
            ex.ToString();  
              
        }  
        StringBuilder str = new StringBuilder();  
        string line=ftpFileListReader.ReadLine();  
        while (line != null)  
        {  
            str.Append(line);  
            str.Append("/n");  
            line = ftpFileListReader.ReadLine();  
        }  
        string[] fen = str.ToString().Split('/n');  
        return fen;  
    }  
    

    难以避免文件夹里还有文件夹 之后是一个我们实现递归文件夹的方法

    [c-sharp] view plaincopy
    /// <summary>  
    /// 下载方法KO  
    /// </summary>  
    /// <param name="ftpads">FTP路径</param>  
    /// <param name="name">需要下载文件路径</param>  
    /// <param name="Myads">保存的本地路径</param>  
    public void downftp(string ftpads, string name,string Myads)  
    {  
        string downloadDir = Myads + name;  
        string ftpdir = ftpads + name;  
        string[] fullname = ftp(ftpads, name, WebRequestMethods.Ftp.ListDirectoryDetails);  
        //判断是否为单个文件   
        if (fullname.Length <= 2)  
        {  
            if (fullname[fullname.Length - 1] == "")  
            {  
                download(downloadDir + "/" + name, ftpads + name + "/" + name);  
            }  
        }  
        else  
        {  
            string[] onlyname = ftp(ftpads, name, WebRequestMethods.Ftp.ListDirectory);  
            if (!Directory.Exists(downloadDir))  
            {  
                Directory.CreateDirectory(downloadDir);  
            }  
            foreach (string names in fullname)  
            {  
                //判断是否具有文件夹标识<DIR>  
                if (names.Contains("<DIR>"))  
                {  
                    string olname = names.Split(new string[] { "<DIR>" },   
                    StringSplitOptions.None)[1].Trim();  
                    downftp(ftpdir, "//" + olname, downloadDir);  
                }  
                else  
                {  
                    foreach (string onlynames in onlyname)  
                    {  
                        if (onlynames == "" || onlynames == " " || names == "")  
                        {  
                            break;  
                        }  
                        else  
                        {  
                            if (names.Contains(" " + onlynames))  
                            {  
                                download(downloadDir + "/" + onlynames, ftpads + name + "/" +   
                                onlynames);  
                                break;  
                            }  
                        }  
                    }  
                }  
            }  
        }  
          
    }  
    

      

    在使用WebRequestMethods.Ftp.ListDirectoryDetails取得文件夹下所有内容时,会发现如果其中有文件夹,那么文件夹的的详细信息中会有一个"<DIR>"标识,我们就可以通过这个来将其区分开来

          同时在获取文件夹以及文件名称时用到WebRequestMethods.Ftp.ListDirectory,这个指令能过只获得文件夹下所有文件包括文件夹的名字,通过这两个指令所获取的信息逐一比较,便能确定出文件或文件夹名以传递到download和downftp方法中

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  • 原文地址:https://www.cnblogs.com/Events/p/3316095.html
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