如何从cookie中获得的Web会议？ [英] How to get Web Session from cookie?

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本文介绍了如何从cookie中获得的Web会议？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图做一个刮一个网页，但为了文章中，我需要一个像

Web会话ID的数据
  

web_session = HQJ3G1GPAAHRZGFR

我怎样才能拿到身份证？

我的code到目前为止是：

 私人小组测试（）

    昏暗POSTDATA作为字符串= "web_session=HQJ3G1GPAAHRZGFR&intext=O&term_$c$c=201210&search_type=A&keyword=&kw_scope=all&kw_opt=all&subj_$c$c=BIO&crse_numb=205&campus=*&instructor=*&instr_session=*&attr_type=*&mon=on&tue=on&wed=on&thu=on&fri=on&sat=on&sun=on&avail_flag=on" /BANPROD/pkgyc_yccsweb.P_Results
    昏暗tempCookie作为新的CookieContainer
    昏暗的编码作为新UTF8Encoding
    昏暗byteData为字节（）= encoding.GetBytes（POSTDATA）

    System.Net.ServicePointManager.SecurityProtocol = Net.SecurityProtocolType.Ssl3
    尝试

        tempCookie.GetCookies（新的URI（https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Results））
        POSTDATA =web_session =＆放大器; tempCookie。

        昏暗postReq由于HttpWebRequest的= DirectCast（WebRequest.Create（https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Results），HttpWebRequest的）
        postReq.Method =POST
        postReq.KeepAlive = TRUE
        postReq.Co​​okieContainer = tempCookie
        postReq.Co​​ntentType =应用/的X WWW的形式urlen codeD


        postReq.UserAgent =Mozilla的/ 4.0（兼容; MSIE 8.0; Windows NT的5.1;三叉戟/ 4.0; .NET CLR 1.0.3705; Media Center PC的4.0; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4 .0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729）
        postReq.Co​​ntentLength = byteData.Length
        昏暗postreqstream作为物流= postReq.GetRequestStream
        postreqstream.Write（byteData，0，byteData.Length）
        postreqstream.Close（）
        昏暗postresponse由于HttpWebResponse
        postresponse = DirectCast（postReq.GetResponse，HttpWebResponse）
        tempCookie.Add（postresponse.Cookies）

        昏暗postresreader作为新的StreamReader（postresponse.GetResponseStream）
        昏暗的翻动书页的String = postresreader.ReadToEnd
        MSGBOX（翻动书页）
    抓住EX作为WebException
        MSGBOX（ex.Status.ToString＆安培; vbNewLine＆安培; ex.Message.ToString）
    结束尝试

结束小组

解决方案

问题是， tempCookie.GetCookies（）不是做你认为是什么它​​做什么。什么它实际上主要是一个过滤器pre-现有的 CookieCollection 下降到仅包括饼干所提供的URL。相反，你需要做的就是先创建一个请求一个页面，会给你这个会话令牌，然后为您的数据的实际要求是什么。因此第一个请求的页面 P_SEARCH ，然后再利用，与的CookieContainer 绑定到它，并张贴到<请求code> P_Results 。

相反，的HttpWebRequest 对象

不过，让我指出你的 Web客户端类的<​​a href = http://stackoverflow.com/questions/2825377/how-can-i-get-the-webclient-to-use-cookies">my在这里发表有关扩展到支持cookie 。你会发现，你可以简化您的codeA不少。下面是一个完整的VB2010工作WinForms应用程序，显示这一点。如果你仍然想使用的HttpWebRequest 对象，这至少应该给你一个什么需要做的事情的想法，太：

 选项严
显式的选项在

进口System.Net

公共类Form1中

    私人小组Form1_Load的（发件人为System.Object的，E作为System.EventArgs）把手MyBase.Load
        ''//创建我们的Web客户端
        使用WC作为新CookieAwareWebClient（）
            ''//设置的SSLv3
            System.Net.ServicePointManager.SecurityProtocol = Net.SecurityProtocolType.Ssl3
            ''//创建一个会话，忽略返回什么
            WC.DownloadString（https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Search）
            ''// POST我们的实际数据并返回结果
            昏暗S = WC.UploadString（https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Results，POST，term_ code = 201130＆放大器; search_type = K＆放大器;关键词=数学）
            Trace.WriteLine（S）
        结束使用
    结束小组
末级

公共类CookieAwareWebClient
    继承Web客户端

    私人CC作为新的CookieContainer（）
    私人末页作为字符串

    受保护的覆盖功能GetWebRequest（BYVAL地址作为的System.Uri）作为System.Net.WebRequest
        昏暗的R = MyBase.GetWebRequest（地址）
        如果TypeOf运算R是HttpWebRequest的再
            随着DirectCast（R，HttpWebRequest的）
                .CookieContainer = CC
                如果不是末页是没有那么
                    .Referer =末页
                结束如果
            结束与
        结束如果
        末页= address.ToString（）
        返回ṛ
    端功能
末级

I'm trying to do an scrape a web page but in order to Post the data I need a web session ID like

web_session=HQJ3G1GPAAHRZGFR

How can I get that ID?

My code so far is:

Private Sub test()

    Dim postData As String = "web_session=HQJ3G1GPAAHRZGFR&intext=O&term_code=201210&search_type=A&keyword=&kw_scope=all&kw_opt=all&subj_code=BIO&crse_numb=205&campus=*&instructor=*&instr_session=*&attr_type=*&mon=on&tue=on&wed=on&thu=on&fri=on&sat=on&sun=on&avail_flag=on" '/BANPROD/pkgyc_yccsweb.P_Results 
    Dim tempCookie As New CookieContainer
    Dim encoding As New UTF8Encoding
    Dim byteData As Byte() = encoding.GetBytes(postData)

    System.Net.ServicePointManager.SecurityProtocol = Net.SecurityProtocolType.Ssl3
    Try

        tempCookie.GetCookies(New Uri("https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Results"))
        'postData="web_session=" & tempCookie.

        Dim postReq As HttpWebRequest = DirectCast(WebRequest.Create("https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Results"), HttpWebRequest)
        postReq.Method = "POST"
        postReq.KeepAlive = True
        postReq.CookieContainer = tempCookie
        postReq.ContentType = "application/x-www-form-urlencoded"


        postReq.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.0.3705; Media Center PC 4.0; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)"
        postReq.ContentLength = byteData.Length
        Dim postreqstream As Stream = postReq.GetRequestStream
        postreqstream.Write(byteData, 0, byteData.Length)
        postreqstream.Close()
        Dim postresponse As HttpWebResponse
        postresponse = DirectCast(postReq.GetResponse, HttpWebResponse)
        tempCookie.Add(postresponse.Cookies)

        Dim postresreader As New StreamReader(postresponse.GetResponseStream)
        Dim thepage As String = postresreader.ReadToEnd
        MsgBox(thepage)
    Catch ex As WebException
        MsgBox(ex.Status.ToString & vbNewLine & ex.Message.ToString)
    End Try

End Sub

解决方案

The problem is that tempCookie.GetCookies() isn't doing what you think its doing. What it actually does is essentially filter a pre-existing CookieCollection down to only include cookies for the supplied URL. Instead, what you need to do is first create a request to a page that will give you this session token, then make the actual request for your data. So first request the page at P_Search, then re-use that request with the CookieContainer bound to it and post to P_Results.

Instead of the HttpWebRequest object, however, let me point you to the WebClient class and my post here about extending it to support cookies. You'll find that you can simplify your code a lot. Below is a full working VB2010 WinForms app that shows this. If you still want to use the HttpWebRequest object this should at least give you an idea of what needs to be done, too:

Option Strict On
Option Explicit On

Imports System.Net

Public Class Form1

    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        ''//Create our webclient
        Using WC As New CookieAwareWebClient()
            ''//Set SSLv3
            System.Net.ServicePointManager.SecurityProtocol = Net.SecurityProtocolType.Ssl3
            ''//Create a session, ignore what is returned
            WC.DownloadString("https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Search")
            ''//POST our actual data and get the results
            Dim S = WC.UploadString("https://taylor.yc.edu/BANPROD/pkgyc_yccsweb.P_Results", "POST", "term_code=201130&search_type=K&keyword=math")
            Trace.WriteLine(S)
        End Using
    End Sub
End Class

Public Class CookieAwareWebClient
    Inherits WebClient

    Private cc As New CookieContainer()
    Private lastPage As String

    Protected Overrides Function GetWebRequest(ByVal address As System.Uri) As System.Net.WebRequest
        Dim R = MyBase.GetWebRequest(address)
        If TypeOf R Is HttpWebRequest Then
            With DirectCast(R, HttpWebRequest)
                .CookieContainer = cc
                If Not lastPage Is Nothing Then
                    .Referer = lastPage
                End If
            End With
        End If
        lastPage = address.ToString()
        Return R
    End Function
End Class

这篇关于如何从cookie中获得的Web会议？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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