Question

用ASP如何实现文件上传，最好有原代码

Answer 1

'文件上传类
Class UpFile_Class
Dim Form,File
Dim AllowExt_ '允许上传类型(白名单)
Dim NoAllowExt_ '不允许上传类型(黑名单)
Dim IsDebug_ '是否显示出错信息
Private oUpFileStream '上传的数据流
Private isErr_ '错误的代码,0或true表示无错
Private ErrMessage_ '错误的字符串信息
Private isGetData_ '指示是否已执行过GETDATA过程
'------------------------------------------------------------------
'类的属性
Public Property Get Version
Version="上传版本"
End Property
Public Property Get isErr '错误的代码,0或true表示无错
isErr=isErr_
End Property
Public Property Get ErrMessage '错误的字符串信息
ErrMessage=ErrMessage_
End Property
Public Property Get AllowExt '允许上传类型(白名单)
AllowExt=AllowExt_
End Property
Public Property Let AllowExt(Value) '允许上传类型(白名单)
AllowExt_=LCase(Value)
End Property
Public Property Get NoAllowExt '不允许上传类型(黑名单)
NoAllowExt=NoAllowExt_
End Property
Public Property Let NoAllowExt(Value) '不允许上传类型(黑名单)
NoAllowExt_=LCase(Value)
End Property
Public Property Let IsDebug(Value) '是否设置为调试模式
IsDebug_=Value
End Property

'----------------------------------------------------------------
'类实现代码
'初始化类
Private Sub Class_Initialize
isErr_ = 0
NoAllowExt="" '黑名单,可以在这里预设不可上传的文件类型,以文件的后缀名来判断,不分大小写,每个每缀名用;号分开,如果黑名单为空,则判断白名单
NoAllowExt=LCase(NoAllowExt)
AllowExt="" '白名单,可以在这里预设可上传的文件类型,以文件的后缀名来判断,不分大小写,每个后缀名用;号分开
AllowExt=LCase(AllowExt)
isGetData_=false
End Sub
'类结束
Private Sub Class_Terminate
on error Resume Next
'清除变量及对像
Form.RemoveAll
Set Form = Nothing
File.RemoveAll
Set File = Nothing
oUpFileStream.Close
Set oUpFileStream = Nothing
if Err.number<>0 then OutErr("清除类时发生错误!")
End Sub
'分析上传的数据
Public Sub GetData (MaxSize)
'定义变量
on error Resume Next
if isGetData_=false then
Dim RequestBinDate,sSpace,bCrLf,sInfo,iInfoStart,iInfoEnd,tStream,iStart,oFileInfo
Dim sFormValue,sFileName
Dim iFindStart,iFindEnd
Dim iFormStart,iFormEnd,sFormName
'代码开始
If Request.TotalBytes < 1 Then '如果没有数据上传
isErr_ = 1
ErrMessage_="没有数据上传,这是因为直接提交网址所产生的错误!"
OutErr("没有数据上传,这是因为直接提交网址所产生的错误!!")
Exit Sub
End If
If MaxSize > 0 Then '如果限制大小
If Request.TotalBytes > MaxSize Then
isErr_ = 2 '如果上传的数据超出限制大小
ErrMessage_="上传的数据超出限制大小!"
OutErr("上传的数据超出限制大小!")
Exit Sub
End If
End If
Set Form = Server.CreateObject ("Scripting.Dictionary")
Form.CompareMode = 1
Set File = Server.CreateObject ("Scripting.Dictionary")
File.CompareMode = 1
Set tStream = Server.CreateObject ("ADODB.Stream")
Set oUpFileStream = Server.CreateObject ("ADODB.Stream")
if Err.number<>0 then OutErr("创建流对象(ADODB.STREAM)时出错,可能系统不支持或没有开通该组件")
oUpFileStream.Type = 1
oUpFileStream.Mode = 3
oUpFileStream.Open
oUpFileStream.Write Request.BinaryRead (Request.TotalBytes)
oUpFileStream.Position = 0
RequestBinDate = oUpFileStream.Read
iFormEnd = oUpFileStream.Size
bCrLf = ChrB (13) & ChrB (10)
'取得每个项目之间的分隔符
sSpace = MidB (RequestBinDate,1, InStrB (1,RequestBinDate,bCrLf)-1)
iStart = LenB(sSpace)
iFormStart = iStart+2
'分解项目
Do
iInfoEnd = InStrB (iFormStart,RequestBinDate,bCrLf & bCrLf)+3
tStream.Type = 1
tStream.Mode = 3
tStream.Open
oUpFileStream.Position = iFormStart
oUpFileStream.CopyTo tStream,iInfoEnd-iFormStart
tStream.Position = 0
tStream.Type = 2
tStream.CharSet = "gb2312"
sInfo = tStream.ReadText
'取得表单项目名称
iFormStart = InStrB (iInfoEnd,RequestBinDate,sSpace)-1
iFindStart = InStr (22,sInfo,"name=""",1)+6
iFindEnd = InStr (iFindStart,sInfo,"""",1)
sFormName = Mid(sinfo,iFindStart,iFindEnd-iFindStart)
'如果是文件
If InStr (45,sInfo,"filename=""",1) > 0 Then
Set oFileInfo = new FileInfo_Class
'取得文件属性
iFindStart = InStr (iFindEnd,sInfo,"filename=""",1)+10
iFindEnd = InStr (iFindStart,sInfo,""""&vbCrLf,1)
sFileName = Trim(Mid(sinfo,iFindStart,iFindEnd-iFindStart))
oFileInfo.FileName = GetFileName(sFileName)
oFileInfo.FilePath = GetFilePath(sFileName)
oFileInfo.FileExt = GetFileExt(sFileName)
iFindStart = InStr (iFindEnd,sInfo,"Content-Type: ",1)+14
iFindEnd = InStr (iFindStart,sInfo,vbCr)
oFileInfo.FileMIME = Mid(sinfo,iFindStart,iFindEnd-iFindStart)
oFileInfo.FileStart = iInfoEnd
oFileInfo.FileSize = iFormStart -iInfoEnd -2
oFileInfo.FormName = sFormName
file.add sFormName,oFileInfo
else
'如果是表单项目
tStream.Close
tStream.Type = 1
tStream.Mode = 3
tStream.Open
oUpFileStream.Position = iInfoEnd
oUpFileStream.CopyTo tStream,iFormStart-iInfoEnd-2
tStream.Position = 0
tStream.Type = 2
tStream.CharSet = "gb2312"
sFormValue = tStream.ReadText
If Form.Exists (sFormName) Then
Form (sFormName) = Form (sFormName) & ", " & sFormValue
else
Form.Add sFormName,sFormValue
End If
End If
tStream.Close
iFormStart = iFormStart+iStart+2
'如果到文件尾了就退出
Loop Until (iFormStart+2) >= iFormEnd
if Err.number<>0 then OutErr("分解上传数据时发生错误,可能客户端的上传数据不正确或不符合上传数据规则")
RequestBinDate = ""
Set tStream = Nothing
isGetData_=true
end if
End Sub
'保存到文件,自动覆盖已存在的同名文件
Public Function SaveToFile(Item,Path)
SaveToFile=SaveToFileEx(Item,Path,True)
End Function
'保存到文件,自动设置文件名
Public Function AutoSave(Item,Path)
AutoSave=SaveToFileEx(Item,Path,false)
End Function
'保存到文件,OVER为真时,自动覆盖已存在的同名文件,否则自动把文件改名保存
Private Function SaveToFileEx(Item,Path,Over)
On Error Resume Next
Dim FileExt
if file.Exists(Item) then
Dim oFileStream
Dim tmpPath
isErr_=0
Set oFileStream = CreateObject ("ADODB.Stream")
oFileStream.Type = 1
oFileStream.Mode = 3
oFileStream.Open
oUpFileStream.Position = File(Item).FileStart
oUpFileStream.CopyTo oFileStream,File(Item).FileSize
tmpPath=Split(Path,".")(0)
FileExt=GetFileExt(Path)
if Over then
if isAllowExt(FileExt) then
oFileStream.SaveToFile tmpPath & "." & FileExt,2
if Err.number<>0 then OutErr("保存文件时出错,请检查路径,是否存在该上传目录!该文件保存路径为" & tmpPath & "." & FileExt)
Else
isErr_=3
ErrMessage_="该后缀名的文件不允许上传!!!" & tmpPath & "." & FileExt
OutErr("该后缀名的文件不允许上传")
End if
Else
Path=GetFilePath(Path)
dim fori
fori=1
if isAllowExt(File(Item).FileExt) then
do
fori=fori+1
Err.Clear()
tmpPath=Path&GetNewFileName()&"."&File(Item).FileExt
oFileStream.SaveToFile tmpPath
loop Until ((Err.number=0) or (fori>50))
if Err.number<>0 then OutErr("自动保存文件出错,已经测试50次不同的文件名来保存,请检查目录是否存在!该文件最后一次保存时全路径为"&Path&GetNewFileName()&"."&File(Item).FileExt)
Else
isErr_=3
ErrMessage_="该后缀名的文件不允许上传!!!!"
OutErr("该后缀名的文件不允许上传")
End if
End if
oFileStream.Close
Set oFileStream = Nothing
else
ErrMessage_="不存在该对象(如该文件没有上传,文件为空)!"
OutErr("不存在该对象(如该文件没有上传,文件为空)")
end if
if isErr_=3 then SaveToFileEx="" else SaveToFileEx=GetFileName(tmpPath)
End Function
'取得文件数据
Public Function FileData(Item)
isErr_=0
if file.Exists(Item) then
if isAllowExt(File(Item).FileExt) then
oUpFileStream.Position = File(Item).FileStart
FileData = oUpFileStream.Read (File(Item).FileSize)
Else
isErr_=3
ErrMessage_="该后缀名的文件不允许上传"
OutErr("该后缀名的文件不允许上传")
FileData=""
End if
else
ErrMessage_="不存在该对象(如该文件没有上传,文件为空)!"
OutErr("不存在该对象(如该文件没有上传,文件为空)")
end if
End Function

'取得文件路径
Public function GetFilePath(FullPath)
If FullPath <> "" Then
GetFilePath = Left(FullPath,InStrRev(FullPath, "\"))
Else
GetFilePath = ""
End If
End function
'取得文件名
Public Function GetFileName(FullPath)
If FullPath <> "" Then
GetFileName = mid(FullPath,InStrRev(FullPath, "\")+1)
Else
GetFileName = ""
End If
End function
'取得文件的后缀名
Public Function GetFileExt(FullPath)
If (FullPath <> "") and (InStrRev(FullPath,".")>1) Then
GetFileExt = LCase(Mid(FullPath,InStrRev(FullPath, ".")+1))
Else
GetFileExt = ""
End If
End function
'取得一个不重复的序号
Public Function GetNewFileName()
dim ranNum
dim dtNow
dtNow=Now()
randomize
ranNum=int(90000*rnd)+10000
'以下这段由webboy提供
GetNewFileName=year(dtNow) & right("0" & month(dtNow),2) & right("0" & day(dtNow),2) & right("0" & hour(dtNow),2) & right("0" & minute(dtNow),2) & right("0" & second(dtNow),2) & ranNum
End Function
Public Function isAllowExt(Ext)
if NoAllowExt="" then
'如果扩展名在允许范围中　或者　未设置允许扩展名，则返回真，允许上传
isAllowExt=cbool(InStr(1,";"&AllowExt&";",LCase(";"&Ext&";")) or (AllowExt="") )
else
isAllowExt=not CBool(InStr(1,";"&NoAllowExt&";",LCase(";"&Ext&";")))
end if
'if Ext="" then isAllowExt=false '如果文件没有扩展名，则不允许上传
End Function
End Class
Public Sub OutErr(ErrMsg)
if IsDebug_=true then
Response.Write ErrMsg
Response.End
End if
End Sub
'----------------------------------------------------------------------------------------------------
'文件属性类
Class FileInfo_Class
Dim FormName,FileName,FilePath,FileSize,FileMIME,FileStart,FileExt
End Class
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