- <%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%><%Option Explicit%> <%'==================================''帶進度條的ASP無組件斷點續傳下載'=================================='簡介：'1)利用xmlhttp方式'2)無組件'3)異步方式獲取，節省服務器資源'4)服務器到服務器的文件傳送。(當然，你自己電腦上的IIS也是http服務器)'5)支持斷點續傳'6)分段下載'7)使用緩衝區，提升下載速度'8)支持大文件下載(速度我就不說了，你可以測，用事實說話)'9)帶進度條：下載百分比、下載量、即時下載速度、平均下載速度''用法：'設置好下面的三個變量，RemoteFileUrl、LocalFileUrl、RefererUrl''作者：午夜狂龍(Madpolice)'[email protected]'2005.12.25'===============================%><%'------------爲設置部分------<%Server.Scripttimeout = 24 * 60 * 60'腳本超時設置，這裏設爲24小時%><%Dim RemoteFileUrl'遠程文件路徑Dim LocalFileUrl'本地文件路徑,相對路徑，可以包含/及..RemoteFileUrl = "http://202.102.14.137/win98.zip"LocalFileUrl = "win98.zip"Dim RefererUrl'該屬性設置文件下載的引用頁，'某些網站只允許通過他們網站內的連接下載文件，'這些網站的服務器判斷用戶是否是在他們網站內點擊的文件鏈接就是靠這個屬性。RefererUrl = "http://www.skycn.com/crack_skycn.html"'若遠程服務器未限制，可留空Dim BlockSize'分段下載的塊大小Dim BlockTimeout'下載塊的超時時間(秒)BlockSize = 128 * 1024'128K，按1M帶寬計算的每秒下載量（可根據自己的帶寬設置，帶寬除以8），建議不要設的太小BlockTimeout = 64'應當根據塊的大小來設置。這裏設爲64秒。如果128K的數據64秒還下載不完(按每秒2K保守估算)，則超時。Dim PercentTableWidth'進度條總寬度PercentTableWidth = 560%><%'--------------------以上爲設置部分---------------%><%'***********************************'！！！以下內容無須修改！！！'***********************************%><%Dim LocalFileFullPhysicalPath'本地文件在硬盤上的絕對路徑LocalFileFullPhysicalPath = Server.Mappath(LocalFileUrl)%><%Dim http,adosOn Error Resume NextSet http = Server.CreateObject("Msxml2.ServerXMLHTTP.7.0")If Err ThenErr.ClearSet http = Server.CreateObject("Msxml2.ServerXMLHTTP.6.0")If Err ThenErr.ClearSet http = Server.CreateObject("Msxml2.ServerXMLHTTP.5.0")If Err ThenErr.ClearSet http = Server.CreateObject("Msxml2.ServerXMLHTTP.3.0")If Err ThenErr.ClearSet http = Server.CreateObject("Msxml2.ServerXMLHTTP")If Err ThenErr.ClearResponse.Write "服務器不支持Msxml，本程序無法運行！"Response.EndEnd IfEnd IfEnd IfEnd IfEnd IfOn Error Goto 0Set ados = Server.CreateObject("Adodb.Stream")%><%Dim RangeStart'分段下載的開始位置Dim fsoSet fso = Server.CreateObject("Scripting.FileSystemObject")If fso.FileExists(LocalFileFullPhysicalPath) Then'判斷要下載的文件是否已經存在RangeStart = fso.GetFile(LocalFileFullPhysicalPath).Size'若存在，以當前文件大小作爲開始位置ElseRangeStart = 0'若不存在，一切從零開始fso.CreateTextFile(LocalFileFullPhysicalPath).Close'新建文件End IfSet fso = Nothing%><%Dim FileDownStart'本次下載的開始位置Dim FileDownEnd'本次下載的結束位置Dim FileDownBytes'本次下載的字節數Dim DownStartTime'開始下載時間Dim DownEndTime'完成下載時間Dim DownAvgSpeed'平均下載速度Dim BlockStartTime'塊開始下載時間Dim BlockEndTime'塊完成下載時間Dim BlockAvgSpeed'塊平均下載速度Dim percentWidth'進度條的寬度Dim DownPercent'已下載的百分比FileDownStart = RangeStart%><%Dim adosCache'數據緩衝區Dim adosCacheSize'緩衝區大小Set adosCache = Server.CreateObject("Adodb.Stream")adosCache.Type = 1'數據流類型設爲字節adosCache.Mode = 3'數據流訪問模式設爲讀寫adosCache.OpenadosCacheSize = 4 * 1024 * 1024'設爲4M，獲取的數據先放到(內存)緩衝區中，當緩衝區滿的時候數據寫入磁盤'若在自己的電腦上運行本程序，當下載百兆以上級別的大文件的時候，可設置大的緩衝區'當然，也不要設的太大，免得發生(按下瀏覽器上的停止按鈕或斷電等)意外情況導致緩衝區中的數據沒有存盤，那緩衝區中的數據就白下載了%><%'先顯示html頭部Response.ClearCall HtmlHead()Response.Flush%><%Dim ResponseRange'服務器返回的http頭中的"Content-Range"Dim CurrentLastBytes'當前下載的結束位置(即ResponseRange中的上限)Dim TotalBytes'文件總字節數Dim temp'分段下載DownStartTime = Now()DoBlockStartTime = Timer()http.open "GET",RemoteFileUrl,true,"",""'用異步方式調用serverxmlhttp'構造http頭http.setRequestHeader "Referer",RefererUrlhttp.setRequestHeader "Accept","*/*"http.setRequestHeader "User-Agent","Baiduspider+(+http://www.baidu.com/search/spider.htm)"'僞裝成Baidu'http.setRequestHeader "User-Agent","Googlebot/2.1 (+http://www.google.com/bot.html)"'僞裝成Googlehttp.setRequestHeader "Range","bytes=" & RangeStart & "-" & Cstr(RangeStart + BlockSize - 1)'分段關鍵http.setRequestHeader "Content-Type","application/octet-stream"http.setRequestHeader "Pragma","no-cache"http.setRequestHeader "Cache-Control","no-cache"http.send'發送'循環等待數據接收While (http.readyState <> 4)'判斷是否塊超時temp = Timer() - BlockStartTimeIf (temp > BlockTimeout) Thenhttp.abortResponse.Write "<script>document.getElementById(""status"").innerHTML=""<strong>錯誤：數據下載超時，建議重試。</strong>"";</script>" & vbNewLine & "</body></html>"Call ErrHandler()Call CloseObject()Response.EndEnd Ifhttp.waitForResponse 1000'等待1000毫秒Wend'檢測狀態If http.status = 416 Then'服務器不能滿足客戶在請求中指定的Range頭。應當是已下載完畢。FileDownEnd = FileDownStart'設置一下FileDownEnd，免得後面的FileDownBytes計算出錯Call CloseObject()Exit DoEnd If'檢測狀態If http.status > 299 Then'http出錯Response.Write "<script>document.getElementById(""status"").innerHTML=""<strong>http錯誤：" & http.status & " " & http.statusText & "</strong>"";</script>" & vbNewLine & "</body></html>"Call ErrHandler()Call CloseObject()Response.EndEnd If'檢測狀態If http.status <> 206 Then'服務器不支持斷點續傳Response.Write <script>document.getElementById(""status"").innerHTML=""<strong> 錯誤：服務器不支持斷點續傳！</strong>"";</script>" & vbNewLine & "</body></html>"Call ErrHandler()Call CloseObject()Response.EndEnd If'檢測緩衝區是否已滿If adosCache.Size >= adosCacheSize Then'打開磁盤上的文件ados.Type = 1'數據流類型設爲字節ados.Mode = 3'數據流訪問模式設爲讀寫ados.Openados.LoadFromFile LocalFileFullPhysicalPath'打開文件ados.Position = ados.Size'設置文件指針初始位置'將緩衝區數據寫入磁盤文件adosCache.Position = 0ados.Write adosCache.Readados.SaveToFile LocalFileFullPhysicalPath,2'覆蓋保存ados.Close'緩衝區復位adosCache.Position = 0adosCache.SetEOSEnd If'保存塊數據到緩衝區中adosCache.Write http.responseBody'寫入數據'判斷是否全部(塊)下載完畢ResponseRange = http.getResponseHeader("Content-Range")'獲得http頭中的"Content-Range"If ResponseRange = "" Then'沒有它就不知道下載完了沒有Response.Write "<script>document.getElementById(""status"").innerHTML=""<strong>錯誤：文件長度未知！</strong>"";</script>" & vbNewLine & "</body></html>"Call CloseObject()Response.EndEnd Iftemp = Mid(ResponseRange,Instr(ResponseRange,"-")+1)'Content-Range是類似123-456/789的樣子CurrentLastBytes = Clng(Left(temp,Instr(temp,"/")-1))'123是開始位置，456是結束位置TotalBytes = Clng(Mid(temp,Instr(temp,"/")+1))'789是文件總字節數If TotalBytes - CurrentLastBytes = 1 ThenFileDownEnd = TotalBytes'將緩衝區數據寫入磁盤文件ados.Type = 1'數據流類型設爲字節ados.Mode = 3'數據流訪問模式設爲讀寫ados.Openados.LoadFromFile LocalFileFullPhysicalPath'打開文件ados.Position = ados.Size'設置文件指針初始位置adosCache.Position = 0ados.Write adosCache.Readados.SaveToFile LocalFileFullPhysicalPath,2'覆蓋保存ados.CloseResponse.Write "<script>document.getElementById(""downsize"").innerHTML=""" & TotalBytes & """;</script>" & vbNewLineResponse.FlushCall CloseObject()Exit Do'結束位置比總大小少1就表示傳輸完成了End If'調整塊開始位置，準備下載下一個塊RangeStart = RangeStart + BlockSize'計算塊下載速度、進度條寬度、已下載的百分比BlockEndTime = Timer()temp = (BlockEndTime - BlockStartTime)If temp > 0 ThenBlockAvgSpeed = Int(BlockSize / 1024 / temp)ElseBlockAvgSpeed = ""End IfpercentWidth = Int(PercentTableWidth * RangeStart / TotalBytes)DownPercent = Int(100 * RangeStart / TotalBytes)'更新進度條Response.Write "<script>document.getElementById(""downpercent"").innerHTML=""" & DownPercent & "%"";document.getElementById(""downsize"").innerHTML=""" & RangeStart & """;document.getElementById(""totalbytes"").innerHTML=""" & TotalBytes & """;document.getElementById(""blockavgspeed"").innerHTML=""" & BlockAvgSpeed & """;document.getElementById(""percentdone"").style.width=""" & percentWidth & """;</script>" & vbNewLineResponse.FlushLoop While Response.IsClientConnectedIf Not Response.IsClientConnected ThenResponse.EndEnd IfDownEndTime = Now()FileDownBytes = FileDownEnd - FileDownStarttemp = DateDiff("s",DownStartTime,DownEndTime)If (FileDownBytes <> 0) And (temp <> 0) ThenDownAvgSpeed = Int((FileDownBytes / 1024) / temp)ElseDownAvgSpeed = ""End If'全部下載完畢後更新進度條Response.Write "<script>document.getElementById(""downpercent"").innerHTML=""100%"";document.getElementById(""percentdone"").style.width=""" & PercentTableWidth & """;document.getElementById(""percent"").style.display=""none"";document.getElementById(""status"").innerHTML=""<strong>下載完畢！用時：" & S2T(DateDiff("s",DownStartTime,DownEndTime)) & "，平均下載速度：" & DownAvgSpeed & "K/秒</strong>"";</script>" & vbNewLine%></body></html><%Sub CloseObject()Set ados = NothingSet http = NothingadosCache.CloseSet adosCache = NothingEnd Sub%><%'http異常退出處理代碼Sub ErrHandler()Dim fsoSet fso = Server.CreateObject("Scripting.FileSystemObject")If fso.FileExists(LocalFileFullPhysicalPath) Then'判斷要下載的文件是否已經存在If fso.GetFile(LocalFileFullPhysicalPath).Size = 0 Then'若文件大小爲0fso.DeleteFile LocalFileFullPhysicalPath'刪除文件End IfEnd IfSet fso = NothingEnd Sub%><%Sub HtmlHead()%><html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>帶進度條的ASP無組件斷點續傳下載----作者：午夜狂龍(Madpolice)--2005.12.25</title></head><body><div id="status">正在下載 <span style="color:blue"><%=RemoteFileUrl%></span> ,請稍候...</div><div> </div><div id="progress">已完成：<span id="downpercent" style="color:green"></span> <span id="downsize" style="color:red"><%=RangeStart%></span> / <span id="totalbytes" style="color:blue"></span> 字節(<span id="blockavgspeed"></span>K/秒)</div><div> </div><div id="percent" align="center" style="display:''"><table style="border-collapse:collapse;" border="1" bordercolor="#666666" cellpadding="0" cellspacing="0" width="<%=PercentTableWidth%>" align="center" bgcolor="#eeeeee"><tr height="20"><td><table border="0" width="" cellspacing="1" bgcolor="#0033FF" id="percentdone"><tr><td> <td></tr></table></td></tr></table></div><%End Sub%><%'------------------------------'將秒數轉換爲"x小時y分鐘z秒"形式'------------------------------Function S2T(ByVal s)Dim x,y,z,tIf s < 1 ThenS2T = (s * 1000) & "毫秒"Elses = Int(s)x = Int(s / 3600)t = s - 3600 * xy = Int(t / 60)z = t - 60 * yIf x > 0 ThenS2T = x & "小時" & y & "分" & z & "秒"ElseIf y > 0 ThenS2T = y & "分" & z & "秒"ElseS2T = z & "秒"End IfEnd IfEnd IfEnd Function'-----------------------%>
ok!