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开发学院WEB开发ASP 多表单域无组件文件上传的例子 阅读

多表单域无组件文件上传的例子

 2002-08-01 11:10:00 来源:WEB开发网   
核心提示:最近经常有人问到这类问题,在此转贴一下,内容:1,数据库表结构(access):UserID:Text(保存上传文件的用户ID)FileContentType:Text(用来保存上传文件的类型,多表单域无组件文件上传的例子,eg:"application/msWord",主要用来使用户能正确下载此文
最近经常有人问到这类问题,在此转贴一下,内容:


1。数据库表结构(access):
UserID:Text(保存上传文件的用户ID)
FileContentType:Text(用来保存上传文件的类型,eg:"application/msWord",主要用来使用户能正确下载此文件)
FileContent:OLE Object(保存文件数据)

2。HTML文件
muploadfile.htm
<Form name="upload_file" enctype="multipart/form-data" action="muploadfile.asp" method=post>
<input type=hidden name="UserID" value="abc">
<input type=hidden name="FileUploadStart"> '这里用来表示开始文件数据上传
File to send: <BR>
<INPUT TYPE="file" name="file_up" size="30"><br>
<INPUT TYPE="file" name="file_up" size="30"><br>
<input type=hidden name="FileUploadEnd"> '这里用来表示文件数据结束
<input type=submit value=Submit>
</Form>

3。ASP文件
muploadfile.asp

<%
Response.Expires=0
Function bin2str(binstr)
  Dim varlen,clow,ccc,skipflag

  skipflag=0
  ccc = ""
  If Not IsNull(binstr) Then
    varlen=LenB(binstr)
    For i=1 To varlen
      If skipflag=0 Then
        clow = MidB(binstr,i,1)
        If AscB(clow) > 127 Then
          ccc =ccc & Chr(AscW(MidB(binstr,i+1,1) & clow))
          skipflag=1
        Else
          ccc = ccc & Chr(AscB(clow))
        End If
      Else
        skipflag=0
      End If
    Next
  End If
  bin2str = ccc
End Function


varByteCount = Request.TotalBytes
bnCRLF = chrB( 13 ) & chrB( 10 )
binHTTPHeader=Request.BinaryRead(varByteCount)    
Divider = LEFTB( binHTTPHeader, INSTRB( binHTTPHeader, bnCRLF ) - 1 )

'开始读非文件域的数据
Do while lenB(binHTTPHeader)>46
  
  binHeaderData = LeftB(binHTTPHeader, INSTRB( binHTTPHeader, bnCRLF & bnCRLF )-1)
  strHeaderData=bin2str(binHeaderData)

  lngFieldNameStart=Instr(strHeaderData,"name="&chr(34))+Len("name="&chr(34))
  lngFieldNameEnd=Instr(lngFieldNameStart,strHeaderData,chr(34))
  
  
  strFieldName=Mid(strHeaderData,lngFieldNameStart,lngFieldNameEnd-lngFieldNameStart)
  strFieldName=Trim(strFieldName)
  strFieldName=Replace(strFieldName,vbcrlf,vbnullstring)
  
    '判断文件数据时候开始
  If strComp(strFieldName,"FileUploadStart",1)=0 Then
    binHTTPHeader=MIDB(binHTTPHeader,INSTRB( DataStart + 1, binHTTPHeader, divider ))
    exit do
  End if
  
  DataStart = INSTRB( binHTTPHeader, bnCRLF & bnCRLF ) + 4
  DataEnd = INSTRB( DataStart + 1, binHTTPHeader, divider ) - DataStart

  binFieldValue=MIDB( binHTTPHeader, DataStart, DataEnd )
  strFieldValue=bin2str(binFieldValue)
  strFieldValue=Trim(strFieldValue)
  strFieldValue=Replace(strFieldValue,vbcrlf,vbnullstring)

  '非文件上传域变量赋值
  execute strFieldName&"="""&strFieldValue&""""
  
    
  binHTTPHeader=MIDB(binHTTPHeader,INSTRB( DataStart + 1, binHTTPHeader, divider ))
    
loop

'开始处理文件数据
Do while lenB(binHTTPHeader)>46
  
  
  binHeaderData = LeftB(binHTTPHeader, INSTRB( binHTTPHeader, bnCRLF & bnCRLF )-1)
    
  strHeaderData=bin2str(binHeaderData)
  
  '读取上传文件的Content-Type
  lngFileContentTypeStart=Instr(strHeaderData,"Content-Type:")+Len("Content-Type:")
  strFileContentType=Trim(Mid(strHeaderData,lngFileContentTypeStart))
  strFileContentType=Replace(strFileContentType,vbCRLF,vbNullString)
  
  '读取上传的文件名
  lngFileNameStart=Instr(strHeaderData,"filename="&chr(34))+Len("filename="&chr(34))
  lngFileNameEnd=Instr(lngFileNameStart,strHeaderData,chr(34))
  strFileName=Mid(strHeaderData,lngFileNameStart,lngFileNameEnd-lngFileNameStart)
  strFileName=Trim(strFileName)
  strFileName=Replace(strFileName,vbCRLF,vbNullString)
  
  '读取上传文件数据
  DataStart = INSTRB( binHTTPHeader, bnCRLF & bnCRLF ) + 4
  DataEnd = INSTRB( DataStart + 1, binHTTPHeader, divider ) - DataStart
  
  If strFileName<>"" Then
        
    binFieldValue=MIDB( binHTTPHeader, DataStart, DataEnd )
    
    '将上传的文件写入数据库
    set conn = Server.CreateObject("ADODB.Connection")
    conn.Open "DSN=abc"
    
    SQL="select * from User_File"
    set rs=server.CreateObject("ADODB.Recordset")
    rs.Open sql,conn,3,3
    rs.addnew
    rs("UserID")=UserID
    rs("FileContentType")=strFileContentType
    rs("FileContent").AppendChunk binFieldValue
    rs.update
    rs.close
    set rs=Nothing
    conn.Close
    set conn=Nothing
    
  End if
  
  binHTTPHeader=MIDB(binHTTPHeader,INSTRB( DataStart + 1, binHTTPHeader, divider ))
  
loop
%>

4。下载用户上传的文件
<%
Response.Buffer   = true
Response.Clear

UserID=request("UserID")

Set conn=server.createobject("adodb.connection")
set rs=server.createobject("adodb.recordset")
conn.open "DSN=UploadFile"
rs.open "select * from User_File where UserID='"&UserID&"'",conn,3,3
Response.ContentType = rs("FileContentType")

lngOffset=0
conChunkSize=1024
lngPictSize=rs("FileContent").ActualSize
Do While lngOffset < lngPictSize
 varChunk = rs("FileContent").GetChunk(conChunkSize)
 Response.BinaryWrite varChunk
 lngOffset = lngOffset + conChunkSize
 If lngOffset > lngPictSize Then Exit Do
Loop

rs.close
set rs=Nothing
conn.close
set conn=nothing
%>

就是这些了,希望此方法对大家能有所帮助。:)

Tags:表单 组件 文件

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