Asp下实现多表单域无组件文件上传的实例

答案：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:  
<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></P><P>
3。ASP文件 
muploadfile.asp</P><P><% 
Response.Expires=0 
Function bin2str(binstr)  
    Dim varlen,clow,ccc,skipflag </P><P>    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 </P><P> 
varByteCount = Request.TotalBytes 
bnCRLF = chrB( 13 ) & chrB( 10 ) 
binHTTPHeader=Request.BinaryRead(varByteCount)         
Divider = LEFTB( binHTTPHeader,  INSTRB( binHTTPHeader, bnCRLF ) - 1 )</P><P>'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)</P><P>    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</P><P>    binFieldValue=MIDB( binHTTPHeader, DataStart, DataEnd ) 
    strFieldValue=bin2str(binFieldValue) 
    strFieldValue=Trim(strFieldValue) 
    strFieldValue=Replace(strFieldValue,vbcrlf,vbnullstring)</P><P>    '非文件上传域变量赋值 
    execute strFieldName&"="""&strFieldValue&"""" 
         
    binHTTPHeader=MIDB(binHTTPHeader,INSTRB( DataStart + 1, binHTTPHeader, divider )) 
loop</P><P>'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")</P><P>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")</P><P>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 
%></P><P>就是这些了，希望此方法对大家能有所帮助。：） 

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