从FTP上下载文件到本地

艾丝凡家的

#region 下载文件
///
/// 从FTP服务器下载文件，指定本地路径和本地文件名,20120817,ylh
///
///  要下载文件所在ftp上的完整路径，如ftp://192.168.0.111/2012-08-17/yinluhui.xml
/// 要下载文件的文件名,如yinluhui.xml
/// 本地路径,如D:\ftp临时文件\20120817
public bool DownFtpToLocation(String ftpPath, String ftpFile, String LocalPath)
{
byte[] bt = null;
try
{
//if (!IsValidFileChars(RemoteFileName) || !IsValidFileChars(LocalFileName) || !IsValidPathChars(LocalPath))
//{
//    throw new Exception("非法文件名或目录名!");
//}
if (Directory.Exists(LocalPath) == false)
{
Directory.CreateDirectory(LocalPath);
}
string LocalFullPath = Path.Combine(LocalPath, ftpFile);
//if (File.Exists(LocalFullPath))
//{
//    throw new Exception("当前路径下已经存在同名文件！");
//}
bt = DownloadFile(ftpPath, LocalPath);
if (bt != null)
{
FileStream stream = new FileStream(LocalFullPath, FileMode.Create);
stream.Write(bt, 0, bt.Length);
stream.Flush();
stream.Close();
return true;
}
else
{
return false;
}
}
catch (Exception ep)
{
//ErrorMsg = ep.ToString();
throw ep;
}
}
///
/// 从FTP服务器下载文件，返回文件二进制数据
///
public byte[] DownloadFile(String ftpPath, String LocalPath)
{
try
{
//if (!IsValidFileChars(RemoteFileName))
//{
//    throw new Exception("非法文件名或目录名!");
//}
FtpWebRequest ftpRequest = (FtpWebRequest)WebRequest.Create(ftpPath);
ftpRequest.Credentials = new NetworkCredential(_account, _pwd);//登陆ftp的用户名，密码
ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;
FtpWebResponse Response = (FtpWebResponse)ftpRequest.GetResponse();
Stream Reader = Response.GetResponseStream();
MemoryStream mem = new MemoryStream(1024 * 500);
byte[] buffer = new byte[1024];
int bytesRead = 0;
int TotalByteRead = 0;
while (true)
{
bytesRead = Reader.Read(buffer, 0, buffer.Length);
TotalByteRead += bytesRead;
if (bytesRead == 0)
break;
mem.Write(buffer, 0, bytesRead);
}
if (mem.Length > 0)
{
return mem.ToArray();
}
else
{
return null;
}
}
catch (Exception ep)
{
throw ep;
}
}
#endregion