如何解决在C#/NET中向FTP服务器上载二进制文件或从FTP服务器下载二进制文件
上载
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 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:
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
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”。
下载
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 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。
解决方法
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,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,bufferSize);
while (readCount > 0)
{
writer.Write(buffer,readCount);
readCount = responseStream.Read(buffer,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。
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