[Powershell] FTP Download File

# Config
$today = Get-Date -UFormat "%Y%m%d"
$LogFilePath = "d:ftpLog_$today.txt"
$UserName = "ftpuser"
$Password = "Password01!"


function REM($Msg){
    $now= Get-Date
    write-host "$now : $Msg" -foregroundcolor Yellow
    Add-Content $LogFilePath "$now : $Msg"
}

function DownloadFile($Username,$Password,$RemoteFile,$LocalFile){

    try
    {
        $ErrorActionPreference="Stop";

        if($RemoteFile -eq $null){ 
            REM "RemoteFile is null"
            return 
        }
        if($LocalFile -eq $null){ 
            REM "LocalFile is null"
            return 
        }
    
        $FTPRequest = [System.Net.FtpWebRequest]::Create($RemoteFile)
        $FTPRequest.Credentials = New-Object System.Net.NetworkCredential($Username,$Password) 
        $FTPRequest.Method = [System.Net.WebRequestMethods+Ftp]::DownloadFile 
        $FTPRequest.UseBinary = $true
        $FTPRequest.KeepAlive = $false
        # Send the ftp request
        $FTPResponse = $FTPRequest.GetResponse() 
        # Get a download stream from the server response 
        $ResponseStream = $FTPResponse.GetResponseStream() 
        # Create the target file on the local system and the download buffer 
        $LocalFileFile = New-Object IO.FileStream ($LocalFile,[IO.FileMode]::Create) 
        [byte[]]$ReadBuffer = New-Object byte[] 1024 
        if($ResponseStream -eq $null){
            return
        }
        # Loop through the download 
        do { 
            $ReadLength = $ResponseStream.Read($ReadBuffer,0,1024) 
            $LocalFileFile.Write($ReadBuffer,0,$ReadLength) 
        
        } 
        while ($ReadLength -ne 0)

        REM "$RemoteFile 下载成功。"
    }
    catch
    {
        REM("Exception Msg: $_")
    }

}



DownloadFile $UserName $Password "ftp://192.168.1.103/frate.csv" "c:downloadsfrate.csv"
DownloadFile $UserName $Password "ftp://192.168.1.103/bcirfp.csv" "c:downloadscirfp.csv" 

连接Linux机器上的ftp时候，切记文件名是区分大小写滴！