vb.netget网页,vbnet fileget
如何用vb.net获得网页的源代码
Dim url As String=" 网址"
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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 ' 获取或设置一个值,该值指示是否与
Internet资源建立持久连接。
Dim reader As StreamReader = _
New StreamReader(httpResp.GetResponseStream,
System.Text.Encoding.GetEncoding(-0))
Dim respHTML As String = reader.ReadToEnd() 'respHTML就是网页源代码
求VB.NET读取网页内容写法
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为你上面的网页地址。
Dim sr As StreamReader = New StreamReader(stream, System.Text.Encoding.UTF8)
Label1.Text = Regex.Match(sr.ReadToEnd, "回答采纳率").ToString
'sr。readtoend读取网页流到末尾,即使用正则表达式从网页流中提取“回答采纳率”,赋值给Label1.Text ‘没有则为空
sr.Dispose() '关闭流
End Sub'要提取什么东西用正则表达式最好
End Class
VB.NET 如何获取网页中的数据
Public Function webCaptureContent(ByVal mWebsiteUrl As String, ByVal mWebsiteType As Boolean) As String
'启动一次具体的数据采集工作,返回采集到的HTML内容:要求必须输入带://的全地址数据
On Error Resume Next
Dim Str_WebContent As String = "请输入查找网站地址."
Dim wb As WebClient = New WebClient() '//创建一个WebClient实例
If mWebsiteUrl.IndexOf("://") 0 Then
'//获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据。(可有可无)
wb.Credentials = CredentialCache.DefaultCredentials
'//从资源下载数据并返回字节数组。(加@是因为网址中间有"/"符号)
Dim pagedata As Object = wb.DownloadData(mWebsiteUrl)
'//转换字符
If mWebsiteType Then
Str_WebContent = Encoding.Default.GetString(pagedata)
Else
Str_WebContent = Encoding.UTF8.GetString(pagedata)
End If
End If
Return Str_WebContent '提取出来新闻内容,删除Body前后的多余内容,同时补充上该 Body标记,形成完整的内容 Str_WebContent '
End Function
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