ASP文件上传工具(只能上传一定大小文件)

  <%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>    <%
    Response.Buffer = True
    Server.ScriptTimeOut=9999999
    On Error Resume Next
    %>
    <head>  www.2cto.com
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <meta http-equiv="Content-Language" content="zh-cn" />
    <meta name="description" content="ASP文件上传工具" />
    <style type="text/css">
    <!--
    body,input {font-size:12px;}
    -->
    </style>
    <title>ASP文件上传工具</title>
    </head>
    <body id="body">
    <%
    upurl=Request.ServerVariables("URL")
    ExtName = "jpg,gif,png,txt,rar,zip,doc,pdf"    '允许扩展名
    SavePath = "upload"                    '保存路径
    If Right(SavePath,1)<>"/" Then SavePath=SavePath&"/" '在目录后加(/)
    CheckAndCreateFolder(SavePath)
    UpLoadAll_a = Request.TotalBytes '取得客户端全部内容
    If(UpLoadAll_a>0) Then
    Set UploadStream_c = Server.CreateObject("ADODB.Stream")
    UploadStream_c.Type = 1
    UploadStream_c.Open
    UploadStream_c.Write Request.BinaryRead(UpLoadAll_a)
    UploadStream_c.Position = 0
    FormDataAll_d = UploadStream_c.Read
    CrLf_e = chrB(13)&chrB(10)
    FormStart_f = InStrB(FormDataAll_d,CrLf_e)
    FormEnd_g = InStrB(FormStart_f+1,FormDataAll_d,CrLf_e)
    Set FormStream_h = Server.Createobject("ADODB.Stream")
    FormStream_h.Type = 1
    FormStream_h.Open
    UploadStream_c.Position = FormStart_f + 1
    UploadStream_c.CopyTo FormStream_h,FormEnd_g-FormStart_f-3
    FormStream_h.Position = 0
    FormStream_h.Type = 2
    FormStream_h.CharSet = "GB2312"
    FormStreamText_i = FormStream_h.Readtext
    FormStream_h.Close
    FileName_j = Mid(FormStreamText_i,InstrRev(FormStreamText_i,"\")+1,FormEnd_g)
    If(CheckFileExt(FileName_j,ExtName)) Then
    SaveFile = Server.MapPath(SavePath & FileName_j)
    If Err Then
    Response.Write "文件上传: <span color:red;"">文件上传出错!</span> <a href=""" & upurl&""">重新上传文件</a><br />"
    Err.Clear
    Else
    SaveFile = CheckFileExists(SaveFile)
    k=Instrb(FormDataAll_d,CrLf_e&CrLf_e)+4
    l=Instrb(k+1,FormDataAll_d,leftB(FormDataAll_d,FormStart_f-1))-k-2
    FormStream_h.Type=1
    FormStream_h.Open
    UploadStream_c.Position=k-1
    UploadStream_c.CopyTo FormStream_h,l
    FormStream_h.SaveToFile SaveFile,2
    SaveFileName = Mid(SaveFile,InstrRev(SaveFile,"\")+1)
    Response.write "文件上传: <span color:red;"">" &SaveFileName& " </span>文件上传成功! <a href=""" &upurl&""">继续上传文件</a><br />"
    End If
    Else
    Response.write "文件上传: <span color:red;"">文件格式不正确!</span> <a href=""" &upurl&""">重新上传文件</a><br />"
    End If
    Else
    %>
    <script language="Javascript">
    <!--
    function ValidInput()
    {
    if(document.upform.upfile.value=="")
    {
    alert("请选择上传文件!")
    document.upform.upfile.focus()
    return false
    }
    return true
    }
    // -->
    </script>
    <form action='<%= Request.ServerVariables("URL") %>' method='post' name="upform" onSubmit="return ValidInput()"
    enctype="multipart/form-data">
    文件上传:
    <input type='file' name='upfile' size="40"> <input type='submit' value="上传">
    </form>
    <%
    End if
    Set FormStream_h = Nothing
    UploadStream.Close
    Set UploadStream = Nothing
    %>
    </body>
    </html>
    <%
    '判断文件类型是否合格
    Function CheckFileExt(FileName,ExtName) '文件名,允许上传文件类型
    FileType = ExtName
    FileType = Split(FileType,",")
    For i = 0 To Ubound(FileType)
    If LCase(Right(FileName,3)) = LCase(FileType(i)) then
    CheckFileExt = True
    Exit Function
    Else
    CheckFileExt = False
    End if
    Next
    End Function
    '检查上传文件夹是否存在,不存在则创建文件夹
    Function CheckAndCreateFolder(FolderName)
    fldr = Server.Mappath(FolderName)
    Set fso = CreateObject("Scripting.FileSystemObject")
    If Not fso.FolderExists(fldr) Then
    fso.CreateFolder(fldr)
    End If
    Set fso = Nothing
    End Function
    '检查文件是否存在,重命名存在文件
    Function CheckFileExists(FileName)
    Set fso=Server.CreateObject("Scripting.FileSystemObject")
    If fso.FileExists(SaveFile) Then
    i=1
    msg=True
    Do While msg
    CheckFileExists = Replace(SaveFile,Right(SaveFile,4),"_" & i & Right(SaveFile,4))
    If not fso.FileExists(CheckFileExists) Then
    msg=False
    End If
    i=i+1
    Loop
    Else
    CheckFileExists = FileName
    End If
    Set fso=Nothing
    End Function
    %>