我正在使用.NET 4 C#。我正在尝试上传ZIP文件,然后将其下载到(我的)服务器。
对于上传我有
using (WebClient client = new WebClient()) { FtpWebRequest request = (FtpWebRequest)WebRequest.Create(MyUrl); request.Method = WebRequestMethods.Ftp.UploadFile; request.EnableSsl = false; request.Credentials = new NetworkCredential(MyLogin, MyPassword); byte[] fileContents = null; using (StreamReader sourceStream = new StreamReader(LocalFilePath)) { fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd()); } request.ContentLength = fileContents.Length; using (Stream requestStream = request.GetRequestStream()) { requestStream.Write(fileContents, 0, fileContents.Length); } FtpWebResponse response = null; response = (FtpWebResponse)request.GetResponse(); response.Close(); }
这似乎可行,因为我在服务器上获得了正确大小的文件。
1)我如何流式传输它,而不是先将其加载到内存中?我将上传非常大的文件。
对于下载,我有
using (WebClient client = new WebClient()) { string HtmlResult = String.Empty; FtpWebRequest request = (FtpWebRequest)WebRequest.Create(remoteFile); request.Method = WebRequestMethods.Ftp.DownloadFile; request.EnableSsl = false; request.Credentials = new NetworkCredential(MyLogin, MyPassword); using (FtpWebResponse response = (FtpWebResponse)request.GetResponse()) using (Stream responseStream = response.GetResponseStream()) using (StreamReader reader = new StreamReader(responseStream)) using (FileStream writer = new FileStream(localFilename, FileMode.Create)) { long length = response.ContentLength; int bufferSize = 2048; int readCount; byte[] buffer = new byte[2048]; readCount = responseStream.Read(buffer, 0, bufferSize); while (readCount > 0) { writer.Write(buffer, 0, readCount); readCount = responseStream.Read(buffer, 0, bufferSize); } } }
2)一切似乎都可以正常工作……除了当我尝试解压缩下载的ZIP文件时,我得到的是无效的ZIP文件。
使用.NET框架将二进制文件上传到FTP服务器的最简单的方法是使用WebClient.UploadFile:
WebClient.UploadFile
WebClient client = new WebClient(); client.Credentials = new NetworkCredential("username", "password"); client.UploadFile("ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");
如果您需要更大的控制权WebClient(例如TLS / SSL加密等),则无法使用,请使用FtpWebRequest。简单的方法是FileStream使用Stream.CopyTo以下命令将a复制到FTP流:
WebClient
FtpWebRequest
FileStream
Stream.CopyTo
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip"); request.Credentials = new NetworkCredential("username", "password"); request.Method = WebRequestMethods.Ftp.UploadFile; using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip")) using (Stream ftpStream = request.GetRequestStream()) { fileStream.CopyTo(ftpStream); }
如果需要监视上传进度,则必须自己逐块复制内容:
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip"); request.Credentials = new NetworkCredential("username", "password"); request.Method = WebRequestMethods.Ftp.UploadFile; using (Stream fileStream = File.OpenRead(@"C:\local\path\file.zip")) using (Stream ftpStream = request.GetRequestStream()) { byte[] buffer = new byte[10240]; int read; while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0) { ftpStream.Write(buffer, 0, read); Console.WriteLine("Uploaded {0} bytes", fileStream.Position); } }
有关GUI进度(WinForms ProgressBar),请参见: 我们如何显示进度栏,以便使用FtpWebRequest上传
ProgressBar
如果要从文件夹上传所有文件,请参阅 C#中的“递归上传到FTP服务器”。
使用.NET框架从FTP服务器下载二进制文件的最简单的方法是使用WebClient.DownloadFile:
WebClient.DownloadFile
WebClient client = new WebClient(); client.Credentials = new NetworkCredential("username", "password"); client.DownloadFile( "ftp://ftp.example.com/remote/path/file.zip", @"C:\local\path\file.zip");
如果您需要更大的控制权WebClient(例如TLS / SSL加密等),则无法使用,请使用FtpWebRequest。简单的方法是将FTP响应流复制到FileStream使用Stream.CopyTo:
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip"); request.Credentials = new NetworkCredential("username", "password"); request.Method = WebRequestMethods.Ftp.DownloadFile; using (Stream ftpStream = request.GetResponse().GetResponseStream()) using (Stream fileStream = File.Create(@"C:\local\path\file.zip")) { ftpStream.CopyTo(fileStream); }
如果需要监视下载进度,则必须自己逐块复制内容:
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp.example.com/remote/path/file.zip"); request.Credentials = new NetworkCredential("username", "password"); request.Method = WebRequestMethods.Ftp.DownloadFile; using (Stream ftpStream = request.GetResponse().GetResponseStream()) using (Stream fileStream = File.Create(@"C:\local\path\file.zip")) { byte[] buffer = new byte[10240]; int read; while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0) { fileStream.Write(buffer, 0, read); Console.WriteLine("Downloaded {0} bytes", fileStream.Position); } }
有关GUI进度(WinForms ProgressBar),请参见: FtpWebRequest使用ProgressBar下载FTP
如果要从远程文件夹 下载所有文件,请参见C#通过FTP下载所有文件和子目录。