c#开发-实现从FTP服务器上下载文件夹中的数据

/// <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();
}

/// </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(new char[2] { '/', 'n' });
return fen;
}

/// <summary>
/// 下载方法
/// </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
{
if (!string.IsNullOrEmpty(names))
{
foreach (string onlynames in onlyname)
{
if (!string.IsNullOrEmpty(onlynames))
{
if (names.Contains(" " + onlynames))
{
download(downloadDir + "/" + onlynames, ftpads + "/" + name + "/" +
onlynames);
break;
}
}
}
}
}
}
}

}

using System;
using System.Text;
using System.IO;
using System.Net;