WebRequest.GetResponse 方法
GetResponse 方法向 Internet 资源发送请求并返回 WebResponse 实例。如果该请求已由 GetRequestStream 调用启动,则 GetResponse 方法完成该请求并返回任何响应。
GetResponse 方法向 Internet 资源发送请求并返回 WebResponse 实例。如果该请求已由 GetRequestStream 调用启动,则 GetResponse 方法完成该请求并返回任何响应。
2 Inherits System.Web.UI.Page
3 protected WithEvents ResURL as System.Web.UI.WebControls.Literal
4 protected WithEvents ErrMSG as System.Web.UI.WebControls.Literal
5 protected WithEvents PageHash as System.Web.UI.WebControls.Literal
6 protected WithEvents PageTitle as System.Web.UI.WebControls.Literal
7 protected WithEvents MetaURL as System.Web.UI.WebControls.Literal
8 protected WithEvents ReqUrl as System.Web.UI.WebControls.Literal
9 protected WithEvents Alliance1 as DPM.Alliance
10 protected WithEvents Alliance2 as DPM.Alliance
11 protected WithEvents Textbox1 as System.Web.UI.WebControls.TextBox
12
13 private Sub Page_Load(ByVal sender as System.object, ByVal e as System.EventArgs) Handles MyBase.Load
14 Dim req as System.Net.HttpWebRequest
15 Dim res as System.Net.HttpWebResponse
16 Dim r as System.IO.StreamReader
17 Dim ex as Exception 'error exeption holder
18 Dim pge as string 'page holder
19
20 if Page.IsPostBack Then
21 ReqUrl.Text = Textbox1.Text
22
23 'set up error trapping
24 Try
25 'display request url
26 req = req.Create(Textbox1.Text)
27
28 'set the user agent
29 'some site might brush you off if it is not set
30 'to stop bots and scrapers
31 req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)"
32
33 'get page
34 res = req.GetResponse()
35 r = new System.IO.StreamReader(res.GetResponseStream())
36 pge = r.ReadToEnd
37 r.Close()
38 res.Close()
39
40 'display respondent url
41 ResURL.Text = res.ResponseUri.AbsoluteUri
42
43 'extract and display meta refresh tag, if it exists
44 MetaURL.Text = System.Text.RegularExpressions.Regex.Match(pge, "URL=(?<href>[^""]+)""").Groups("href").Value()
45
46 'extract and display page title
47 PageTitle.Text = System.Text.RegularExpressions.Regex.Match(pge, "<title>(?<title>[^<]+)</title>", System.Text.RegularExpressions.RegexOptions.IgnoreCase).Groups("title").Value
48
49 Dim SHhash as new System.Security.Cryptography.SHA1Managed()
50
51 'convert the page to a byte array
52 Dim pgeb as byte() = System.Text.Encoding.ASCII.GetBytes(pge)
53
54 'get the hash as a byte array
55 Dim hashvalue as byte() = SHhash.ComputeHash(pgeb)
56
57 'display the hash as a string
58 Dim b as byte
59 PageHash.Text = ""
60 for Each b in hashvalue
61 PageHash.Text += Right("0" + Hex$(b), 2)
62 Next
63 ErrMSG.Text = ""
64 catch ex
65 'display any error message
66 ErrMSG.Text = ex.Message
67 ResURL.Text = ""
68 MetaURL.Text = ""
69 PageTitle.Text = ""
70 PageHash.Text = ""
71 End Try
72 End if
73 'reset the textbox
74 Textbox1.Text = "http://"
75 End Sub
76
77 private Sub InitializeComponent()
78
79 End Sub
80 End class