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。
我有上传
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,因为我在服务器上获得了一个大小合适的文件。
1) 我如何流式传输它,而不是先将它加载到内存中?我将上传非常大的文件。
为了下载我有
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) 一切似乎都正常......除了当我尝试解压缩下载的 ZIP 文件时,我得到一个无效的 ZIP 文件。
最佳答案
上传
使用 .NET 框架将二进制文件上传到 FTP 服务器的最简单方法是使用 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");
如果您需要更好的控制,WebClient
不提供(如 TLS/SSL encryption、ascii/文本传输模式、传输恢复等),请使用 FtpWebRequest
.简单的方法是使用 Stream.CopyTo
将 FileStream
复制到 FTP 流:
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);
}
如果你需要监控上传进度,你必须自己分块复制内容:
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);
}
}
对于 GUI 进度(WinForms ProgressBar
),请参阅:
How can we show progress bar for upload with FtpWebRequest
如果要上传文件夹中的所有文件,请参阅
Recursive upload to FTP server in C# .
下载
使用 .NET 框架从 FTP 服务器下载二进制文件的最简单方法是使用 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,WebClient
不提供(如 TLS/SSL encryption 、ascii/文本传输模式、resuming transfers 等),请使用 FtpWebRequest
.简单的方法是使用 Stream.CopyTo
将 FTP 响应流复制到 FileStream
:
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);
}
如果你需要监控下载进度,你必须自己分块复制内容:
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);
}
}
对于 GUI 进度(WinForms ProgressBar
),请参阅:
FtpWebRequest FTP download with ProgressBar
如果要从远程文件夹下载所有文件,请参阅
C# Download all files and subdirectories through FTP .
关于c# - 在 C#/.NET 中上传文件到 FTP 服务器或从 FTP 服务器下载文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44606028/