有人嫌无组件上传类太大（我的上传类是13.8KB大小），下面就写了个简单的单文件上传的示例，顺便把无组件上传的原理也写在代码里面了。下面的示例适合在iframe或者弹出窗口中调用。不过，还是推荐大家用完整的类进行上传，完整的类在功能、易用性以及安全性上都比较好。

http://www.

<form action="?action=upload" method="post" enctype="multipart/form-data">
选择文件:<input type="file" name="file1" /> <input type="submit" value="提交" /
</form><br />
<%
If request.QueryString("action")="upload" Then
    Call doUpload("upload")
End If

Function doUpload(Byval savePath)
    Dim vData, vSplit, SplitStart, SplitEnd, ValueEnd, path, value
    Dim vdata1, Str, FormNameStart, FormNameEnd, FormName, FileNameStart, FileNameEnd, FileName, ContentType
    vData = request.BinaryRead(request.TotalBytes)
    SplitStart = instrb(vData,chrb(13) & chrb(10))    '找到分隔字符串的位置
    vSplit = midb(vData, 1, SplitStart - 1)                '取出分隔符
    SplitEnd = instrb(vData,chrb(13) & chrb(10) & chrb(13) & chrb(10)) '找到文件数据的开始位置
    
    '读出数据前面的描述部分，类似于
    'Content-Disposition: form-data; name="file1"; filename="D:\TempFiles\a.jpg"
    'Content-Type: image/pjpeg
    vdata1 = midb(vData,SplitStart + 2,SplitEnd - SplitStart - 2)
    str = BinToGB(vdata1) 
    FormNameStart = instr(1,str,"name=""") + 6
    FormNameEnd = instr(FormNameStart,str,"""")
    FormName = Mid(str,FormNameStart,FormNameEnd-FormNameStart) '读出表单名字
    
    FileNameStart = instr(1,str,"filename=""")+10
    FileNameEnd = instr(FileNameStart,str,"""")
    FileName = Mid(str,FileNameStart,FileNameEnd-FileNameStart) '读出文件在客户端的路径
    FileName = Replace(FileName,"/","\")
    FileName = split(FileName,"\")(ubound(split(FileName,"\"))) '读出文件名字
    
    SplitEnd = SplitEnd + 4                             '数据真正开始的位置
    ValueEnd = instrb(SplitEnd,vData,vSplit)            '找到数据结束位置
    value = midb(vData,SplitEnd,ValueEnd-SplitEnd-2)            '取出数据
    
    '保存文件的代码,因为stream直接写入value会出错，因此用adodb.recordset转换一下
    Dim tmpStrm
    Set tmpStrm = server.CreateObject("adodb.stream")
    tmpStrm.mode=3
    tmpStrm.type= 1
    tmpStrm.open()
    Dim Info : Set Info = server.CreateObject("ADODB.Recordset")
    Info.Fields.Append "value", 205,-1
    Info.open()
    Info.addNew()
    Info("value").appendChunk(value)
    tmpStrm.write(Info("value"))
    Info("value").appendChunk(null)
    Info.update()
    Info.Close()
    Set Info = Nothing
    tmpStrm.saveToFile server.MapPath(savePath) & "\" & FileName,2  '以原文件名保存到upload下面
    tmpStrm.close()
    Set tmpStrm = Nothing
    doUpload = FileName
End Function

'二进制转GB函数
Function BinToGB(Bin)
    Dim i,tAsc,str
    for i=1 to lenb(Bin)
        tAsc = ascb(midb(bin,i,1))
        if tAsc<128 Then
            str = str & chr(tAsc)
        Else
            i = i+1
            str = str & chr(clng("&H" & hex(tAsc) & hex(ascb(midb(bin,i,1)))))
        End if
    Next
    BinToGB = str
End Function
%>