PowerShell 实现批量下载文件

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

简介

批量文件下载器 PowerShell 版，类似于迅雷批量下载功能，且可以破解 Referer 防盗链

源代码

[int]$script:completed = 0 # 下载完成数量
[int]$script:succeed = 0 # 下载成功数量# 开始下载（普通方法）
function StartDownload {
param([array]$urlList, [string]$path, [string]$referer)
$last = $urlList.Count
$watch = Measure-Command {
for($i = 0; $i -lt $last; $i++) {
DownloadItem -url $urlList[$i] -path $path -referer $referer
Start-Sleep -Milliseconds 200 # 延迟0.2秒
}
}
$failed = $script:completed - $succeed
$elapsed = [Math]::Round($watch.TotalMilliseconds/1000, 2) # 总计耗时（秒）
Write-Output ""
Write-Host "总共下载 $script:completed，成功 $script:succeed，失败 $failed，耗时 $elapsed s" -ForegroundColor Red -BackgroundColor Yellow
$script:completed = 0
$script:succeed = 0
}# 下载单个文件
function DownloadItem {
param([string]$url, [string]$path, [string]$referer)
$url_file = $url.Substring($url.LastIndexOf('/') + 1);
if($referer.Contains("(*)")) {
$referer = $referer -replace "$\*$", $url
}
try {
$tmpFileName = [System.IO.Path]::GetTempFileName()
$destFileName = [System.IO.Path]::Combine($path, $url_file)
$watch = Measure-Command {
# 下载文件到临时文件夹
Invoke-WebRequest -Uri $url -Method Get -Headers @{"Referer"=$referer} -UserAgent "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36" -TimeoutSec 120 -OutFile $tmpFileName
# 将临时文件移动到目标文件夹
Move-Item -Path $tmpFileName -Destination $destFileName -Force
}
$script:succeed += 1
$fileLength =[Math]::Ceiling((Get-Item -LiteralPath $destFileName).Length / 1024.0)
$elapsed = [Math]::Round($watch.TotalMilliseconds)
# 下载成功！12.jpg - 115KB/2356ms
Write-Host "下载成功！$url_file - $fileLength KB/$elapsed ms" -ForegroundColor Green
} catch {
Write-Error $PSItem.ToString()
} finally {
$script:completed += 1
}
}# 主函数运行 AppStart 即可启动
function AppStart {
Clear-Host
Write-Welcome
$urlFormat = ReadInput_Url -message "输入URL(含通配符，例如 http://www.spany.com/2019/(*).jpg)"
$start = ReadInput_Integer -message "通配符数字开始(0~200)" -minValue 0 -maxValue 200
$end = $start + 200
$end = ReadInput_Integer -message "通配符数字结束($start~$end)" -minValue: $start -maxValue $end
$len = ReadInput_Integer -message "通配符数字长度(1~5)" -minValue: 1 -maxValue 5
$referer = ReadInput_Url -message "输入Referer为破解防盗链(如果Referer中含有通配符(*)，则将被当前URL替换，如无须Referer则直接回车)" -defaultValue "https://www.baidu.com/visit"
Write-Output "" $urlList = BuildUrlList -urlFormat $urlFormat -start $start -end $end -len $len
if($urlList.Count -gt 0) {
Write-Output "URL列表如下:"
foreach($url in $urlList) {
Write-Output "`t$url"
}
Write-Output ""
if(ReadInput_YesOrNo -message "是否开始下载？(y/n)") {
$path = ReadInput_Path -message "输入文件存储目录"
Write-Output ""
StartDownload -urlList $urlList -path $path -referer $referer
}
} else {
Write-Warning "不能创建URL列表，请核对参数！"
}
Write-Output ""
}AppStart