$listFTP = [system.net.ftpwebrequest] [system.net.webrequest]::create("ftpurl")
$listFTP.Credentials = New-Object System.Net.NetworkCredential("username","password")
$listFTP.Method=[system.net.WebRequestMethods+ftp]::listdirectorydetails
$response = $listFTP.getresponse()
$stream = New-Object System.Io.StreamReader($response.getresponsestream(),[System.Text.Encoding]::UTF8)
while(-not $stream.EndOfStream){
    $stream.ReadLine()
}
$stream.Close()
$response.Close()
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#ftpurl:ftp路径
#username：ftp用户名
#password：ftp密码
#localfilename：要上传的文件名
$fileinf=New-Object System.Io.FileInfo("localfilename")
$upFTP = [system.net.ftpwebrequest] [system.net.webrequest]::create("ftpurl"+$fileinf.name)
$upFTP.Credentials = New-Object System.Net.NetworkCredential("username","password")
$upFTP.Method=[system.net.WebRequestMethods+ftp]::UploadFile
$upFTP.KeepAlive=$false
$sourceStream = New-Object System.Io.StreamReader($fileInf.fullname)
$fileContents = [System.Text.Encoding]::UTF8.GetBytes($sourceStream.ReadToEnd())
$sourceStream.Close();
$upFTP.ContentLength = $fileContents.Length;
$requestStream = $upFTP.GetRequestStream();
$requestStream.Write($fileContents, 0, $fileContents.Length);
$requestStream.Close();
$response =$upFTP.GetResponse();
$response.StatusDescription
$response.Close();
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$downFTP = [system.net.ftpwebrequest] [system.net.webrequest]::create("url"+"filename")
$downFTP.Credentials = New-Object System.Net.NetworkCredential("username","password")
$response = $downFTP.getresponse()
$stream=$response.getresponsestream()
$buffer = new-object System.Byte[] 2048
$outputStream=New-Object System.Io.FileStream("patch"+"filename","Create")
while(($readCount = $stream.Read($buffer, 0, 1024)) -gt 0){
    $outputStream.Write($buffer, 0, $readCount)
}
$outputStream.Close()

$stream.Close()
$response.Close()
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