.NET从优酷专辑中采集所有视频及信息（VB.NET代码）

Imports System.Net
Imports System.IO
Imports System.Text
Imports System.Text.RegularExpressions
Public Class frmMain
Structure VList
Dim id As Integer
Dim title As String
Dim vid1 As String
Dim vid2 As String
Overloads Function ToString() As String
Return String.Format("{0}:<{1}> [{2}]", id, title, vid1)
End Function
End Structure
Dim myList As New List(Of VList)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
' 防止重复创建变量
Dim wr1 As HttpWebRequest
Dim wr2 As HttpWebResponse
Dim ret As String
Dim reg As Match
Dim g As Group
Dim preVid As String = "" '上一个VID
Dim nowid As Integer = 0 '当前的视频集数
Dim listUrl As String = TextBox1.Text '获取专辑URL，如 http://www.youku.com/playlist_show/id_2350764.html
Dim tarUrl As String = "http://v.youku.com/v_playlist/f{0}" '{0}ListID
reg = Regex.Match(listUrl, "playlist_show/id_(\d+).*\.html")
If Not reg.Success Then
MsgBox("专辑列表提取失败！")
Exit Sub
End If
g = reg.Groups(1)
tarUrl = String.Format(tarUrl, g.Value) & "o{1}p{0}.html" '{0}集数 {1}排序
wr1 = HttpWebRequest.Create(TextBox1.Text)
wr2 = wr1.GetResponse
ret = New StreamReader(wr2.GetResponseStream, Encoding.GetEncoding(wr2.CharacterSet)).ReadToEnd
reg = Regex.Match(ret, "<title>(.+) - 专辑 - 优酷视频</title>")
If Not reg.Success Then
MsgBox("专辑名称提取失败！")
Else
g = reg.Groups(1)
MsgBox("专辑名：《" & g.Value & "》")
End If
Do
' 从Web流中获取页面文本
wr1 = HttpWebRequest.Create(String.Format(tarUrl, nowid, "0")) '按倒序方式查找视频
wr2 = wr1.GetResponse
ret = New StreamReader(wr2.GetResponseStream, Encoding.GetEncoding(wr2.CharacterSet)).ReadToEnd
'TextBox2.Text = ret
' 创建一个临时视频列表变量
Dim nlist As New VList
nlist.id = nowid '获取ID
' 获取videoId
reg = Regex.Match(ret, "var\s+videoId\s*=\s*""(\d+)""\s*;")
If Not reg.Success Then Exit Do
g = reg.Groups(1)
' 如果VID等于上一个VID最退出
If g.Value = preVid Then Exit Do
nlist.vid1 = g.Value
' 获取videoId2
reg = Regex.Match(ret, "var\s+videoId2\s*=\s*""((\w|=)+)""\s*;") '"var\s+videoId2\s*=\s*""(\w+)""\s*;")
If Not reg.Success Then Exit Do
g = reg.Groups(1)
nlist.vid2 = g.Value
' 获取标题
reg = Regex.Match(ret, "<title>(.+) - (.+) - 视频 - 优酷视频 - 在线观看 - </title>")
If Not reg.Success Then
nlist.title = "{名称查找错误}"
Else
g = reg.Groups(2)
nlist.title = g.Value
End If
' 收尾工作
myList.Add(nlist) '添加到总列表中
preVid = nlist.vid1 '记录最后一个VID
wr2.Close()
Me.Text = nowid & " : 处理完成！"
nowid += 1
Loop
wr2.Close()
MsgBox(nowid & " 个视频全部采集处理完成！")
Button2_Click(sender, e)
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
ListBox1.Items.Clear()
For Each ls As VList In myList
ListBox1.Items.Add(String.Format("{0}:<{1}> [{2}]", ls.id, ls.title, ls.vid1))
Next
myList.Clear()
End Sub

End Class