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  • asp.net教程之纯ASP上传图像文件到数据库实例

  • 2018-04-24 08:38 来源:未知
原作者: IAmTrue 

------------------------- 
<html> 

<head> 
<title>保存图片到数据库</title> 
</head> 

<body> 
<b> 

<p></b>你可以找个图片试试,保存完毕后会有提示</p> 

<form METHOD="POST" ENCTYPE="multipart/form-data" ACTION="savetodb.asp"> 
 <p>Email : <input NAME="email" VALUE="wangcq@sina.com" size="20">

 Picture : <input TYPE="file" NAME="blob">

 <input TYPE="submit" NAME="Enter"> </p> 
</form> 
</body> 
</html> 

savetodb.asp 
---------------------------------- 
<% 

Response.Buffer = TRUE 
Response.Clear 
byteCount = Request.TotalBytes 

RequestBin = Request.BinaryRead(byteCount) 
Dim UploadRequest 
Set UploadRequest = CreateObject("Scripting.Dictionary") 

BuildUploadRequest RequestBin 

email = UploadRequest.Item("email").Item("Value") 

contentType = UploadRequest.Item("blob").Item("ContentType") 
filepathname = UploadRequest.Item("blob").Item("FileName") 
filename = Right(filepathname,Len(filepathname)-InstrRev(filepathname,"")) 
picture = UploadRequest.Item("blob").Item("Value") 

'Response.ContentType = contentType 
'Response.binaryWrite picture 

set objCn = server.createobject("adodb.connection") 
set objRst = server.createobject("adodb.recordset") 
objCn.Open "upload" 
objrst.Open "pic", objcn, 1,3,2 
objrst.addnew 
objrst.fields("filename")=filename 
objrst.fields("type")="gif" 

objrst.fields("what").appendchunk picture 
objrst.update 
response.write "<a href=showpic.asp?id=" & objrst("id") & ">第" & objrst("id") & "个图片。</a>" 
objrst.close 

objCn.close 
set objrst=nothing 
set objcn = nothing 
%> 
<!--#include file="upload.asp"--> 

showpic.asp 
---------------------------------------- 
<% 
set objCn = server.createobject("adodb.connection") 
set objRst = server.createobject("adodb.recordset") 
objCn.Open "upload" 
objrst.Open "select what from pic where id=" & request("id"), objcn 

if not objrst.eof then 
  response.binarywrite objrst("what") 
end if 

objrst.close 
objCn.close 
set objrst=nothing 
set objcn = nothing 
%> 


upload.asp 
------------------------------------------- 
<% 
Sub BuildUploadRequest(RequestBin) 
  'Get the boundary 
  PosBeg = 1 
  PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(13))) 
  boundary = MidB(RequestBin,PosBeg,PosEnd-PosBeg) 
  boundaryPos = InstrB(1,RequestBin,boundary) 
  'Get all data inside the boundaries 
  Do until (boundaryPos=InstrB(RequestBin,boundary & getByteString("--"))) 
    'Members variable of objects are put in a dictionary object 
    Dim UploadControl 
    Set UploadControl = CreateObject("Scripting.Dictionary") 
    'Get an object name 
    Pos = InstrB(BoundaryPos,RequestBin,getByteString("Content-Disposition")) 
    Pos = InstrB(Pos,RequestBin,getByteString("name=")) 
    PosBeg = Pos+6 
    PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(34))) 
    Name = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg)) 
    PosFile = InstrB(BoundaryPos,RequestBin,getByteString("filename=")) 
    PosBound = InstrB(PosEnd,RequestBin,boundary) 
    'Test if object is of file type 
    If PosFile<>0 AND (PosFile<PosBound) Then 
      'Get Filename, content-type and content of file 
      PosBeg = PosFile + 10 
      PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(34))) 
      FileName = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg)) 
      'Add filename to dictionary object 
      UploadControl.Add "FileName", FileName 
      Pos = InstrB(PosEnd,RequestBin,getByteString("Content-Type:")) 
      PosBeg = Pos+14 
      PosEnd = InstrB(PosBeg,RequestBin,getByteString(chr(13))) 
      'Add content-type to dictionary object 
      ContentType = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg)) 
      UploadControl.Add "ContentType",ContentType 
      'Get content of object 
      PosBeg = PosEnd+4 
      PosEnd = InstrB(PosBeg,RequestBin,boundary)-2 
      Value = MidB(RequestBin,PosBeg,PosEnd-PosBeg) 
      Else 
      'Get content of object 
      Pos = InstrB(Pos,RequestBin,getByteString(chr(13))) 
      PosBeg = Pos+4 
      PosEnd = InstrB(PosBeg,RequestBin,boundary)-2 
      Value = getString(MidB(RequestBin,PosBeg,PosEnd-PosBeg)) 
    End If 
    'Add content to dictionary object 
  UploadControl.Add "Value" , Value   
    'Add dictionary object to main dictionary 
  UploadRequest.Add name, UploadControl   
    'Loop to next object 
    BoundaryPos=InstrB(BoundaryPos+LenB(boundary),RequestBin,boundary) 
  Loop 

End Sub 

'String to byte string conversion 
Function getByteString(StringStr) 
For i = 1 to Len(StringStr) 
   char = Mid(StringStr,i,1) 
  getByteString = getByteString & chrB(AscB(char)) 
Next 
End Function 

'Byte string to string conversion 
Function getString(StringBin) 
getString ="" 
For intCount = 1 to LenB(StringBin) 
  getString = getString & chr(AscB(MidB(StringBin,intCount,1))) 
Next 
End Function 
%> 

test.mdb(dsn 名称:upload) 
---------------------------------------- 
表pic: 
id:自动加 
filename:文本 
type:文本 
what:ole 

----------------------------------------- 
存成单个文件,放在一个目录下,打开(必须用http://...)getfile.htm 
上传一个.gif或.jpg就可以显示了。 
对于大文件在显示程序(showpic.asp)中可能会用到循环和getchunk方法。自己去做。记住,由于ASP目前暂时不支持二进行制读写,只能存二进制到数据库中。 
有什么问题,请致电veryblue@chinese.com (IAmTrue) 
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