先检查是否已经存在该目录了，如果存在，则不做任何处理，如果不存在则创建。
希望对各位快速开发有用。
CheckFolder.asp

<%
'*******************************************************************************
'页面名称: CreateFolder.asp
'页面功能: 生成n层目录的文件夹
'使用方法: 调用CheckFolder()函数,例如: CheckFolder(path)
'传入参数: 即将上传的文件的相对路径,例如: path = "./upload/bbb/ccc/ddd"
'缺 点： 必须在参数path里面带上upload文件夹
'*******************************************************************************
Sub CheckFolder(path)
SplitPath(path)
End Sub
Sub SplitPath(path)
dim Road '物理路径
Road = Server.Mappath("./upload")
dim CurRoad '当前路径
Road = Split(Road,"\",-1,1)
CurRoad = Road(UBound(Road))
dim folder,FSO
Set FSO = Server.CreateObject("Scripting.FileSystemObject")
folder = Split(path,"\",-1,1)
for i = 0 to UBound(folder) step 1
if folder(i) = CurRoad then
j = i
exit for
end if
Next
i = j + 1
if i <= UBound(folder) then
dim myroad
myroad = Server.MapPath(".\upload")
for i = j + 1 to UBound(folder) step 1
CreateFolder myroad,folder(i)
myroad = myroad &"/"& folder(i)
Next
end if
End Sub
Sub CreateFolder(mypath,folderName)
Dim fso,f
Set fso = Server.CreateObject("Scripting.FileSystemObject")
if Not(fso.FolderExists(mypath+"/"+folderName)) then
set f = fso.CreateFolder(mypath+"/"+folderName)
end if
End Sub
Set fso = nothing
%>