How to use PowerShell to download files from SharePoint?

Question

I've used the following sites to help me get this far and to troubleshoot.

1. Download file from SharePoint
2. How to download newest file from SharePoint using PowerShell
3. Mike Smith's Tech Training Notes SharePoint, PowerShell and .Net!
4. Upload file to a SharePoint doc library via PowerShell
5. Download latest file from SharePoint Document Library
6. How to iterate each folders in each of the SharePoint websites using PowerShell
7. PowerShell's Get-ChildItem on SharePoint Library

I am trying to download random files from SharePoint folder, and I have it working for when I actually know the file name and extension.

Working code with name and extension:

$SharePoint = "https://Share.MyCompany.com/MyCustomer/WorkLoad.docx"
$Path = "$ScriptPath\$($CustomerName)_WorkLoad.docx"

#Get User Information
$user = Read-Host "Enter your username"
$username = "$user@MyCompany"
$password = Read-Host "Enter your password" -AsSecureString

#Download Files
$WebClient = New-Object System.Net.WebClient
$WebClient.Credentials = New-Object System.Net.Networkcredential($UserName, $Password)
$WebClient.DownloadFile($SharePoint, $Path)

However, I don't seem to be able to figure out how to do it with multiple files of unknown names or extensions.

I have tried mapping a drive, only to end up with "drive mapping failed" & "The network path was not found." errors:

$SharePoint  = Read-Host 'Enter the full path to Delivery Site'
$LocalDrive  = 'P:'
$Credentials = Get-Credential


if (!(Test-Path $LocalDrive -PathType Container)) {
    $retrycount = 0; $completed = $false
    while (-not $completed) {
        Try {
            if (!(Test-Path $LocalDrive -PathType Container)) {
                (New-Object -ComObject WScript.Network).MapNetworkDrive($LocalDrive,$SharePoint,$false,$($Credentials.username),$($Credentials.GetNetworkCredential().password))
            }
            $Completed = $true
        }
        Catch {
            if ($retrycount -ge '5') {
                Write-Verbose "Mapping SharePoint drive failed the maximum number of times"
                throw "SharePoint drive mapping failed for '$($SharePoint)': $($Global:Error[0].Exception.Message)"
            } else {
                Write-Verbose "Mapping SharePoint drive failed, retrying in 5 seconds."
                Start-Sleep '5'
                $retrycount++
            }
        }
    }
}

I've also used the following code with similar results or no results at all.

#Get User Information
$user = Read-Host "Enter your username"
$username = "$user@MyCompany"
$password = Read-Host "Enter your password" -AsSecureString

#Gathering the location of the Card Formats and Destination folder
$Customer = "$SharePoint\MyCustomer"
$Products = "$Path\$($CustomerName)\Products\"

#Get Documents from SharePoint
$credential = New-Object System.Management.Automation.PSCredential($UserName, $Password)
New-PSDrive -Credential $credential -Name "A" -PSProvider "FileSystem" -Root "$SharePoint"
net use $spPath #$password /USER:$user@corporate

#Get PMDeliverables file objects recursively
Get-ChildItem -Path "$Customer" | Where-Object { $_.name -like 'MS*' } | Copy-Item -Destination $Products  -Force -Verbose

Answer 1

没有定义的“输入参数”，并不能完全清楚您需要的完整解决方案，因此，我将根据您的描述提供一些应使用的PowerShell代码段。

我将为您提供各种OOTB功能（例如Get-SPWeb等）的基础知识，不过如果需要的话，也可以提供这些详细信息。我在脚本编写中也过于露骨，尽管知道其中一些行可以链接，通过管道传输等以缩短和提高效率。

本示例将遍历SharePoint库的内容并将其下载到本地计算机：

$Destination = "C:\YourDestinationFolder\ForFilesFromSP"
$Web = Get-SPWeb "https://YourServerRoot/sites/YourSiteCollection/YourSPWebURL"
$DocLib = $Web.Lists["Your Doc Library Name"]
$DocLibItems = $DocLib.Items

foreach ($DocLibItem in $DocLibItems) {
    if($DocLibItem.Url -Like "*.docx") {
        $File = $Web.GetFile($DocLibItem.Url)
        $Binary = $File.OpenBinary()
        $Stream = New-Object System.IO.FileStream($Destination + "\" + $File.Name), Create
        $Writer = New-Object System.IO.BinaryWriter($Stream)
        $Writer.write($Binary)
        $Writer.Close()
    }
}

这是非常基本的。顶部的变量是您希望在本地计算机上存储下载文件（$Destination），SharePoint网站/网站的URL（$Web）和文档库的名称（Your Doc Library Name）的位置。

然后，脚本会遍历库（foreach ($DocLibItem in $DocLibItems) {}）中的项目，可以选择过滤带有.docx文件扩展名的项目，并将每个项目下载到本地计算机。

您可以通过针对文档库中的特定子文件夹，按文档的元数据或属性进行过滤，甚至在一个脚本中遍历多个站点，网站和/或库来进行自定义，甚至可以基于相似的属性进行过滤。