在C#/.NET中向FTP服务器上载文件或从FTP服务器下载文件 [英] Upload and download a file to/from FTP server in C#/.NET
问题描述
我正在使用.NET 4 C#.我正在尝试上传一个ZIP文件，然后将其下载到(我的)服务器.
I am using .NET 4 C#. I am trying to upload and then download a ZIP file to (my) server.
我要上传
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，因为我在服务器上得到了一个合适大小的文件.
This seems to work, in that I get a file on the server of the right size.
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.
1) How do I stream it, rather than load it into memory first? I will be uploading very large files.
我已经下载了
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)一切似乎都正常……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.
2) Everything seems to work ... except when I try to unzip the downloaded ZIP file I get an invalid ZIP file.
推荐答案
上传
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如果您需要更好的控制，则WebClient不提供(例如 TLS/SSL加密，等等)，请使用 FtpWebRequest .简单的方法是使用
If you need a greater control, that WebClient does not offer (like TLS/SSL encryption, etc), use FtpWebRequest. Easy way is to just copy a FileStream to FTP stream using 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);
}
如果您需要监视上传进度，则必须自己逐块复制内容:
If you need to monitor an upload progress, you have to copy the contents by chunks yourself:
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:
我们如何显示使用FtpWebRequest上传的进度栏
For GUI progress (WinForms ProgressBar), see:
How can we show progress bar for upload with FtpWebRequest
如果要上传文件夹中的所有文件，请参见
以C#递归上传到FTP服务器.
If you want to upload all files from a folder, see
Recursive upload to FTP server in C#.
使用.NET Framework从FTP服务器下载二进制文件的最简单的方法是使用
The most trivial way to download a binary file from an FTP server using .NET framework is using 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");
如果您需要更好的控制，则WebClient不提供(例如 TLS/SSL加密，等等)，请使用 FtpWebRequest .简单的方法是使用
If you need a greater control, that WebClient does not offer (like TLS/SSL encryption, etc), use FtpWebRequest. Easy way is to just copy an FTP response stream to FileStream using 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:
If you need to monitor a download progress, you have to copy the contents by chunks yourself:
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
For GUI progress (WinForms ProgressBar), see:
FtpWebRequest FTP download with ProgressBar
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.
If you want to download all files from a remote folder, see
C# Download all files and subdirectories through FTP.
这篇关于在C#/.NET中向FTP服务器上载文件或从FTP服务器下载文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
