如何上传图片并自动生成缩略图和水印
请问大家 如何实现图片上传并自动生成缩略图和水印和功能啊，
有的话麻烦提供一下代码学习一下，先谢谢了啊？
1.
<form action="img_save.asp" method="POST" enctype="multipart/form-data" name=form id="form">
<TABLE cellpadding="3" cellspacing="1" align="center">
<tr>
<td class=th colspan="2">
<font size="3" color="#FF0000">Logo</font></td>
</tr>
<tr>
<td align="right" width="21%">上传Logo：</td>
<td width="77%"><input type="file" name="img" size="20" value="浏览" />
<input type="submit" value="上传" name="B1" isshowprocessbar="True" >
gif或jpg格式</td>
</tr>
<tr>
<td align="right" width="21%">Logo预览：
</td>
<td align="left" width="77%" ><%if myrs("img")<>"" then %>
<img src="<%=myrs("img")%>" width="50" height="50" border="1" />
<%else
response.write "您还没有上传图片！"
end if%></td>
</tr>
</table>
</form>
2.
<!--#include FILE="conn.asp"-->
<!--#include FILE="upload.inc"-->
<%
if session("user_name")="" then '''''''''''自己定义的用户名,每个人有每人的图片
response.write "<script language='javascript'>"
response.write "alert('非法操作!');"
response.write "history.go(-1);"
response.write "</script>"
else
user_name="user_name_"&session("user_name")&"_"
nowtime=now()
sj=cstr(year(nowtime))+"-"+right("0"+cstr(month(nowtime)),2)+"-"+right("0"+cstr(day(nowtime)),2)
dim upload,file,formName,formPath,iCount
set upload=new upload_F
function MakedownName()
dim fname
fname = now()
fname = replace(fname,"-","")
fname = replace(fname," ","")
fname = replace(fname,":","")
fname = replace(fname,"PM","")
fname = replace(fname,"AM","")
fname = replace(fname,"上午","")
fname = replace(fname,"下午","")
fname = int(fname) + int((10-1+1)*Rnd + 1)
MakedownName=fname
end function
formPath="img/" ''''''''''文件夹名称,放在根目录里
iCount=0
for each formName in upload.file ''列出所有上传了的文件
set file=upload.file(formName) ''生成一个文件对象
if file.FileSize<100 then
response.write "<FIELDSET align=center><LEGEND align=center>文件上传发生错误 </LEGEND><br>请先选择你要上传的文件！ [ <a href=# onclick=history.go(-1)>重新上传</a> ]</fieldset>"
response.end
end if
if file.FileSize>204800 then
response.write "<FIELDSET align=center><LEGEND align=center>文件上传发生错误 </LEGEND><br>文件大小超过了限制200K！[ <a href=# onclick=history.go(-1)>重新上传</a> ]</fieldset>"
response.end
end if
fileExt=lcase(right(file.filename,4))
if fileEXT<>".gif" and fileEXT<>".jpg" then
response.write "<FIELDSET align=center><LEGEND align=center>文件上传发生错误！</LEGEND><br>文件格式不正确！[ <a href=# onclick=history.go(-1)>重新上传</a> ]</fieldset>"
response.end
end if
if file.FileSize>0 then ''如果 FileSize > 0 说明有文件数据
set myrs = server.CreateObject ("Adodb.recordset")
strsql = "select * from 注册 where user_name="&session("user_name")&""
myrs.open strsql,myconn,1,3
if myrs("img")<>"" then
tempfpath=myrs("img")
FiLePaTh = Server.MapPath(tempfpath)
Set fso = CreateObject("Scripting.FileSystemObject")
fso.DeleteFile(FiLePaTh)
Set fso = nothing
end if
newname=user_id&MakedownName()&"."&mid(file.FileName,InStrRev(file.FileName, ".")+1) '''自定义
file.SaveAs Server.mappath(formPath&newname) ''保存文件
iCount=iCount+1
else
response.write "未找到文件 <A HREF=javascript:history.back(1)>返回</A>"
response.end
end if
next
myrs("img")="img/"&newname
myrs.Update
myrs.close
Set myrs=nothing
myconn.Close
Set myconn=nothing
response.Redirect("img.asp")
end if
%>
3.upload.inc
<SCRIPT RUNAT=SERVER LANGUAGE=VBSCRIPT>
dim upfile_Stream
Class upload_F
dim Form,File,Version
Private Sub Class_Initialize
dim iStart,iFileNameStart,iFileNameEnd,iEnd,vbEnter,iFormStart,iFormEnd,theFile
dim strDiv,mFormName,mFormValue,mFileName,mFileSize,mFilePath,iDivLen,mStr
Version="化境编程界HTTP上传程序 Version 1.0"
if Request.TotalBytes<1 then Exit Sub
set Form=CreateObject("Scripting.Dictionary")
set File=CreateObject("Scripting.Dictionary")
set upfile_Stream=CreateObject("Adodb.Stream")
upfile_Stream.mode=3
upfile_Stream.type=1
upfile_Stream.open
upfile_Stream.write Request.BinaryRead(Request.TotalBytes)
vbEnter=Chr(13)&Chr(10)
iDivLen=inString(1,vbEnter)+1
strDiv=subString(1,iDivLen)
iFormStart=iDivLen
iFormEnd=inString(iformStart,strDiv)-1
while iFormStart < iFormEnd
iStart=inString(iFormStart,"name=""")
iEnd=inString(iStart+6,"""")
mFormName=subString(iStart+6,iEnd-iStart-6)
iFileNameStart=inString(iEnd+1,"filename=""")
if iFileNameStart>0 and iFileNameStart<iFormEnd then
iFileNameEnd=inString(iFileNameStart+10,"""")
mFileName=subString(iFileNameStart+10,iFileNameEnd-iFileNameStart-10)
iStart=inString(iFileNameEnd+1,vbEnter&vbEnter)
iEnd=inString(iStart+4,vbEnter&strDiv)
if iEnd>iStart then
mFileSize=iEnd-iStart-4
else
mFileSize=0
end if
set theFile=new FileInfo
theFile.FileName=getFileName(mFileName)
theFile.FilePath=getFilePath(mFileName)
theFile.FileSize=mFileSize
theFile.FileStart=iStart+4
theFile.FormName=FormName
file.add mFormName,theFile
else
iStart=inString(iEnd+1,vbEnter&vbEnter)
iEnd=inString(iStart+4,vbEnter&strDiv)
if iEnd>iStart then
mFormValue=subString(iStart+4,iEnd-iStart-4)
else
mFormValue=""
end if
form.Add mFormName,mFormValue
end if
iFormStart=iformEnd+iDivLen
iFormEnd=inString(iformStart,strDiv)-1
wend
End Sub
Private Function subString(theStart,theLen)
dim i,c,stemp
upfile_Stream.Position=theStart-1
stemp=""
for i=1 to theLen
if upfile_Stream.EOS then Exit for
c=ascB(upfile_Stream.Read(1))
If c > 127 Then
if upfile_Stream.EOS then Exit for
stemp=stemp&Chr(AscW(ChrB(AscB(upfile_Stream.Read(1)))&ChrB(c)))
i=i+1
else
stemp=stemp&Chr(c)
End If
Next
subString=stemp
End function
Private Function inString(theStart,varStr)
dim i,j,bt,theLen,str
InString=0
Str=toByte(varStr)
theLen=LenB(Str)
for i=theStart to upfile_Stream.Size-theLen
if i>upfile_Stream.size then exit Function
upfile_Stream.Position=i-1
if AscB(upfile_Stream.Read(1))=AscB(midB(Str,1)) then
InString=i
for j=2 to theLen
if upfile_Stream.EOS then
inString=0
Exit for
end if
if AscB(upfile_Stream.Read(1))<>AscB(MidB(Str,j,1)) then
InString=0
Exit For
end if
next
if InString<>0 then Exit Function
end if
next
End Function
Private Sub Class_Terminate
form.RemoveAll
file.RemoveAll
set form=nothing
set file=nothing
upfile_Stream.close
set upfile_Stream=nothing
End Sub
Private function GetFilePath(FullPath)
If FullPath <> "" Then
GetFilePath = left(FullPath,InStrRev(FullPath, "\"))
Else
GetFilePath =""
End If
End function
Private function GetFileName(FullPath)
If FullPath <> "" Then
GetFileName = mid(FullPath,InStrRev(FullPath, "\")+1)
Else
GetFileName =""
End If
End function
Private function toByte(Str)
dim i,iCode,c,iLow,iHigh
toByte=""
For i=1 To Len(Str)
c=mid(Str,i,1)
iCode =Asc(c)
If iCode<0 Then iCode = iCode + 65535
If iCode>255 Then
iLow = Left(Hex(Asc(c)),2)
iHigh =Right(Hex(Asc(c)),2)
toByte = toByte & chrB("&H"&iLow) & chrB("&H"&iHigh)
Else
toByte = toByte & chrB(AscB(c))
End If
Next
End function
End Class
Class FileInfo
dim FormName,FileName,FilePath,FileSize,FileStart
Private Sub Class_Initialize
FileName =""
FilePath =""
FileSize = 0
FileStart= 0
FormName =""
End Sub
Public function SaveAs(FullPath)
dim dr,ErrorChar,i
SaveAs=1
if trim(fullpath)="" or FileSize=0 or FileStart=0 or FileName="" then exit function
if FileStart=0 or right(fullpath,1)="/" then exit function
set dr=CreateObject("Adodb.Stream")
dr.Mode=3
dr.Type=1
dr.Open
upfile_Stream.position=FileStart-1
upfile_Stream.copyto dr,FileSize
dr.SaveToFile FullPath,2
dr.Close
set dr=nothing
SaveAs=0
end function
End Class
</SCRIPT>
