在瀏覽器的地址欄里直接輸入一個doc或xls或jpg的文件的url路徑，那么該文件會直接顯示在瀏覽器里。而在很多時候我們希望能直接彈出下載提示框讓用戶下載，我們該怎么辦呢？這里有兩種方法：
1、設置你的服務器的iis，給doc等后綴名做映射。
2、在向客戶端發送時設置其contenttype。
下面詳細說明方法2
程序代碼:
| <% Response.Buffer = true Response.Clear dim url Dim fso,fl,flsize dim Dname Dim objStream,ContentType,flName,isre,url1 '*********************************************調用時傳入的下載文件名 Dname=trim(request("n")) '****************************************************************** If Dname<>"" Then '******************************下載文件存放的服務端目錄 url=server.MapPath("/")&"/"&Dname '*************************************************** End If Set fso=Server.CreateObject("Scripting.FileSystemObject") Set fl=fso.getfile(url) flsize=fl.size flName=fl.name Set fl=Nothing Set fso=Nothing %> <% Set objStream = Server.CreateObject("ADODB.Stream") objStream.Open objStream.Type = 1 objStream.LoadFromFile url Select Case lcase(Right(flName, 4)) Case ".asf" ContentType = "video/x-ms-asf" Case ".avi" ContentType = "video/avi" Case ".doc" ContentType = "application/msword" Case ".zip" ContentType = "application/zip" Case ".xls" ContentType = "application/vnd.ms-excel" Case ".gif" ContentType = "image/gif" Case ".jpg", "jpeg" ContentType = "image/jpeg" Case ".wav" ContentType = "audio/wav" Case ".mp3" ContentType = "audio/mpeg3" Case ".mpg", "mpeg" ContentType = "video/mpeg" Case ".rtf" ContentType = "application/rtf" Case ".htm", "html" ContentType = "text/html" Case ".txt" ContentType = "text/plain" Case Else ContentType = "application/octet-stream" End Select Response.AddHeader "Content-Disposition", "attachment; filename=" & flName Response.AddHeader "Content-Length", flsize Response.Charset = "UTF-8" Response.ContentType = ContentType Response.BinaryWrite objStream.Read Response.Flush response.Clear() objStream.Close Set objStream = Nothing %> |
將下面的東西存成download.asp然后你就可以用<a herf="http://xxx.xxx.com/download.asp？n=file.doc">download!</a>來下載同一目錄下的file.doc了!
但是這里有個問題就是直接將file.doc路徑寫在url里是不安全的，所以解決方案應該是將file.doc的路徑存到數據庫里，同過查找數據庫后得到路徑
在這個程序的最前面如果加上一個判斷：
| if instr(Request.ServerVariables("HTTP_REFERER"),"http://你的域名")=0 then Response.End end if |
就能夠很好的防止別人的盜鏈了.
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