如何用vb.net獲得網(wǎng)頁的源代碼

Dim url As String=" 網(wǎng)址"

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Dim httpReq As System.Net.HttpWebRequest

Dim httpResp As System.Net.HttpWebResponse

Dim httpURL As New System.Uri(url)

httpReq = CType(WebRequest.Create(httpURL), HttpWebRequest)

httpReq.Method = "GET"

httpResp = CType(httpReq.GetResponse(), HttpWebResponse)

httpReq.KeepAlive = False ' 獲取或設(shè)置一個值，該值指示是否與

Internet資源建立持久連接。

Dim reader As StreamReader = _

New StreamReader(httpResp.GetResponseStream,

System.Text.Encoding.GetEncoding(-0))

Dim respHTML As String = reader.ReadToEnd() 'respHTML就是網(wǎng)頁源代碼

VB.NET 如何獲取網(wǎng)頁中的數(shù)據(jù)

Public Function webCaptureContent(ByVal mWebsiteUrl As String, ByVal mWebsiteType As Boolean) As String

'啟動一次具體的數(shù)據(jù)采集工作,返回采集到的HTML內(nèi)容:要求必須輸入帶://的全地址數(shù)據(jù)

On Error Resume Next

Dim Str_WebContent As String = "請輸入查找網(wǎng)站地址."

Dim wb As WebClient = New WebClient() '//創(chuàng)建一個WebClient實例

If mWebsiteUrl.IndexOf("://") 0 Then

'//獲取或設(shè)置用于對向 Internet 資源的請求進行身份驗證的網(wǎng)絡(luò)憑據(jù)。（可有可無）

wb.Credentials = CredentialCache.DefaultCredentials

'//從資源下載數(shù)據(jù)并返回字節(jié)數(shù)組。（加@是因為網(wǎng)址中間有"/"符號）

Dim pagedata As Object = wb.DownloadData(mWebsiteUrl)

'//轉(zhuǎn)換字符

If mWebsiteType Then

Str_WebContent = Encoding.Default.GetString(pagedata)

Else

Str_WebContent = Encoding.UTF8.GetString(pagedata)

End If

End If

Return Str_WebContent '提取出來新聞內(nèi)容,刪除Body前后的多余內(nèi)容,同時補充上該 Body標記,形成完整的內(nèi)容 Str_WebContent '

End Function

求VB.NET讀取網(wǎng)頁內(nèi)容寫法

Imports System.Net

Imports System.IO

Imports System.Text.RegularExpressions

Public Class Form1

Private Sub button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

Dim stream As IO.Stream = WebRequest.Create(UrlAdress).GetResponse().GetResponseStream()

'注意urladress為你上面的網(wǎng)頁地址。

Dim sr As StreamReader = New StreamReader(stream, System.Text.Encoding.UTF8)

Label1.Text = Regex.Match(sr.ReadToEnd, "回答采納率").ToString

'sr。readtoend讀取網(wǎng)頁流到末尾，即使用正則表達式從網(wǎng)頁流中提取“回答采納率”，賦值給Label1.Text ‘沒有則為空

sr.Dispose() '關(guān)閉流

End Sub'要提取什么東西用正則表達式最好

End Class