powershell网络蜘蛛解决乱码问题

抓取（爬取）网上信息的脚本程序，俗称网络蜘蛛。
powershell中自带了这样的两个命令，【Invoke-WebRequest】和【Invoke-RestMethod】，但这两个命令有时候会乱码。

现在转帖分享， 某个【歪果仁】写的脚本。来源于 墙外出处： https://gist.github.com/angel-vladov/9482676

核心代码

function Read-HtmlPage {param ([Parameter(Mandatory=$true, Position=0, ValueFromPipeline=$true)][String] $Uri)# Invoke-WebRequest and Invoke-RestMethod can't work properly with UTF-8 Response so we need to do things this way.[Net.HttpWebRequest]$WebRequest = [Net.WebRequest]::Create($Uri)[Net.HttpWebResponse]$WebResponse = $WebRequest.GetResponse()$Reader = New-Object IO.StreamReader($WebResponse.GetResponseStream())$Response = $Reader.ReadToEnd()$Reader.Close()# Create the document class[mshtml.HTMLDocumentClass] $Doc = New-Object -com "HTMLFILE"$Doc.IHTMLDocument2_write($Response)# Returns a HTMLDocumentClass instance just like Invoke-WebRequest ParsedHtml$Doc#powershell 传教士 转帖并修改的文章 2016-01-01, 允许再次转载，但必须保留名字和出处，否则追究法律责任}

原文函数

function Read-HtmlPage {  param ([Parameter(Mandatory=$true, Position=0, ValueFromPipeline=$true)][String] $Uri)  # Invoke-WebRequest and Invoke-RestMethod can't work properly with UTF-8 Response so we need to do things this way.  [Net.HttpWebRequest]$WebRequest = [Net.WebRequest]::Create($Uri)  [Net.HttpWebResponse]$WebResponse = $WebRequest.GetResponse()  $Reader = New-Object IO.StreamReader($WebResponse.GetResponseStream())  $Response = $Reader.ReadToEnd()  $Reader.Close()  # Create the document class  [mshtml.HTMLDocumentClass] $Doc = New-Object -com "HTMLFILE"  $Doc.IHTMLDocument2_write($Response)    # Returns a HTMLDocumentClass instance just like Invoke-WebRequest ParsedHtml  $Doc}

PowerShell function you can use for reading UTF8 encoded HTML pages content. The built in Invoke-WebRequest and Invoke-RestMethod fail miserably.