Question

我正在编写一个使用带有凭据的ftp服务器的程序。我正在尝试从服务器检索目录列表，但是当我到达该行时：

string line = reader.ReadLine();

我得到的字符串只包含：“无法打开\”host：/ lib1 \“。”

如果我尝试获取另一行，则抛出下一个异常：远程服务器返回错误：（550）文件不可用（例如，找不到文件，没有访问权限。）

我肯定（使用另一个ftp应用程序）知道ftp服务器上存在'lib1'目录并且我的凭据（用户名和密码）是正确的。

这是我的代码：

 public class FTPClient
{
    public string UserName { get; set; }
    public string Password { get; set; }
    public string IpAddress { get; set; }
    public int Port { get; set; }

    public FTPClient(string _userName, string _password, string _address, int _port)
    {
        UserName = _userName;
        Password = _password;
        IpAddress = _address;
        Port = _port;
    }

    public void GetDirectoriesList(string _path)
    {           
        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri("ftp://" + 
        IpAddress + _path));
        request.UseBinary = true;
        request.Method = WebRequestMethods.Ftp.ListDirectory;
        request.Credentials = new NetworkCredential(UserName, Password);

        FtpWebResponse response = (FtpWebResponse)request.GetResponse();
        Stream responseStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(responseStream);

        string line = reader.ReadLine();
        while (line!=null)
        {
            ... //do something with line
            line = reader.ReadLine();
        }
        ...
        reader.Close();
        response.Close();


    }

我用它如下：

FTPClient ftpClient = new FTPClient("user1", "pass1", "192.168.2.110", 21);

        string dirList = ftpClient.GetDirectoriesList("/lib1");

有人能发现问题吗？

Answer 1

我的解决方案：

public string[] GetDirectory()
{
    StringBuilder result = new StringBuilder();
    FtpWebRequest requestDir = (FtpWebRequest)WebRequest.Create("ftp://urserverip/");
    requestDir.Method = WebRequestMethods.Ftp.ListDirectory;
    requestDir.Credentials = new NetworkCredential("username", "password");
    FtpWebResponse responseDir = (FtpWebResponse)requestDir.GetResponse();
    StreamReader readerDir  = new StreamReader(responseDir.GetResponseStream());

    string line = readerDir.ReadLine();
    while (line != null)
    {
        result.Append(line);
        result.Append("\n");
        line = readerDir.ReadLine();
    }

    result.Remove(result.ToString().LastIndexOf('\n'), 1);
    responseDir.Close(); 
    return result.ToString().Split('\n');
}

Answer 2

Abdul Waheed answer的一些改进：

添加了using块来清理FtpWebResponse和StreamReader个对象;

减少字符串操作：

private static string[] GetDirectoryListing()
{
    FtpWebRequest directoryListRequest = (FtpWebRequest)WebRequest.Create("ftp://urserverip/");
    directoryListRequest.Method = WebRequestMethods.Ftp.ListDirectory;
    directoryListRequest.Credentials = new NetworkCredential("username", "password");

    using (FtpWebResponse directoryListResponse = (FtpWebResponse)directoryListRequest.GetResponse())
    {
        using (StreamReader directoryListResponseReader = new StreamReader(directoryListResponse.GetResponseStream()))
        {
            string responseString = directoryListResponseReader.ReadToEnd();
            string[] results = responseString.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.RemoveEmptyEntries);
            return results;
        }
    }
}

使用凭据连接ftp服务器

2 个答案: