ASP文件上传神功 第二重(招势图加内功心法)

发表于:2007-06-30来源:作者:点击数: 标签:
第二重:文本信息与图片文件同时提交保存到 数据库 图片文件也可保存到磁盘文件 这个问题已经不是什么新鲜问题了,网上也有大把的教程,但大多数是授人以鱼,而不授人以渔,经过辛苦的资料收集,思考,调试,整理,我基本上已经把这个问题从原理上搞清楚了,
第二重:文本信息与图片文件同时提交保存到数据库
图片文件也可保存到磁盘文件

  这个问题已经不是什么新鲜问题了,网上也有大把的教程,但大多数是授人以鱼,而不授人以渔,经过辛苦的资料收集,思考,调试,整理,我基本上已经把这个问题从原理上搞清楚了,现在根据我自己的理解,在范例程序的基础上,加以解释,希望能对部分网友(比我还菜的:-))有所帮助。

  请诸位大虾能对其中的不正或不良这处予以指正。

  程序中stream对象的用法上参考了“化境HTTP上传程序 Version 2.0”在代码,在此对稻香老农和梁无惧表示衷心的感谢和由衷的敬意。

  上次讲了单个图片文件保存到数据库,这次讲一下文本信息与图片文件同时提交保存到数据库,图片文件也可保存到磁盘文件。

MultiInputOrImageToData.asp
<%@ Language=VBScript %>
<% option explicit %>

<%
 ‘’把一段二进制数据写入到一个文件
 sub saveBin2File(srmSource,posB,posLen,strPath)
  dim srmObj
  set srmObj = server.CreateObject("adodb.stream")
  srmObj.Type = 1
  srmObj.Mode = 3
  srmObj.Open
   
  srmSource.Position = posB-1
  srmSource.CopyTo srmObj,posLen
  srmObj.Position = 0
  srmObj.SaveToFile strPath,2   ‘’如果该文件已经存在,无条件覆盖
  srmObj.Close
  set srmObj = nothing
 end sub

 ‘’二进制数据转换为字符串,包括汉字
 function getTextfromBin(srmSource,posBegin,posLen)
  dim srmObj, strData
  set srmObj = server.CreateObject("adodb.stream")
  srmObj.Type = 1
  srmObj.Mode = 3
  srmObj.Open

  srmSource.position = posBegin-1   ‘’位置计数首数不一样,这个对象是对0开始的
  srmSource.CopyTo srmObj,posLen
  srmObj.Position = 0
  srmObj.Type = 2
  srmObj.Charset = "gb2312"
  strData = srmObj.ReadText

  srmObj.Close
  set srmObj = nothing
   
  getTextfromBin = strData
 end function
    
 ‘’双字节字符串转换成单字节字符串
 function getSBfromDB(bytString)
  dim bin, i
  bin = ""
  for i=1 to len(bytString)
   bin = bin & chrb(asc(mid(bytString,i,1)))
  next
  getSBfromDB = bin
 end function

 ‘’单字节字符串转换成双字节字符串
 function getDBfromSB(bitString)
  dim str, i
  str = ""
  for i=1 to lenb(bitString)
   str = str & chr(ascb(midb(bitString,i,1)))
  next
  getDBfromSB = str
 end function
 
 ‘’从一个完整路径中析出文件名称
 function getFileNamefromPath(strPath)
  getFileNamefromPath = mid(strPath,instrrev(strPath,"\")+1)
 end function

 ‘’判断函数
 function iif(cond,expr1,expr2)
  if cond then
   iif = expr1
  else
   iif = expr2
  end if
 end function
 
 ‘’定义数据库连接字符串
 dim cnstr
 cnstr = "driver={Microsoft Aclearcase/" target="_blank" >ccess Driver (*.mdb)};dbq=" & server.MapPath("./upload.mdb")
%>

<HTML>
 <HEAD>
  <title>多个表单域或图像同步保存到数据库</title>
  <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 </HEAD>
 <body>
<p>导航菜单:<b>上传图片</b> <a href="ShowImageListFromData2.asp">显示图片</a><hr></p>
 
<%
 if request.ServerVariables("REQUEST_METHOD") = "POST" then

  dim sCome, binData
  dim posB, posE, posSB, posSE
  dim binCrlf, binSub
  dim strTitle, strFileName, strContentType, posFileBegin, posFileLen, aryFileInfo
  dim i, j
  dim dicData
  dim strName,strValue
  
  binCrlf = getSBfromDB(vbcrlf)  ‘’定义一个单字节的回车换行符
  binSub = getSBfromDB("--")    ‘’定义一个单字节的“--”字符串
  
  set sCome = server.CreateObject("adodb.stream")
  sCome.Type = 1  ‘’指定返回数据类型 adTypeBinary=1,adTypeText=2
  sCome.Mode = 3  ‘’指定打开模式 adModeRead=1,adModeWrite=2,adModeReadWrite=3
  sCome.Open
  sCome.Write request.BinaryRead(request.TotalBytes)
  
  sCome.Position = 0
  binData = sCome.Read
  ‘’response.BinaryWrite binData    ‘’调试用:显示提交的所有数据
  ‘’response.Write "<hr>"       ‘’调试用
  
  posB = instrb(binData,binSub)
  posB = instrb(posB,binData,bincrlf) + 2   ‘’+2是加入回车换行符本身的长度
  posB = instrb(posB,binData,getSBfromDB("name=""")) + 6
  
  set dicData = server.CreateObject("scripting.dictionary")    ‘’用来保存信息
  
  do until posB=6
   posE = instrb(posB,binData,getSBfromDB(""""))
   ‘’Response.Write "name=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"
   strName = getTextfromBin(sCome,posB,posE-posB)
   
   posB = posE + 1     ‘’指针移动到“"”的后面
   posE = instrb(posB,binData,bincrlf)
   ‘’Response.Write posB & "->" & posE & "<br>"
  
   if instrb(midb(binData,posB,posE-posB),getSBfromDB("filename=""")) > 0 then   ‘’判断成功表示这是一个file域
    posB = instrb(posB,binData,getSBfromDB("filename=""")) + 10
    posE = instrb(posB,binData,getSBfromDB(""""))
    if posE>posB then
     ‘’response.Write "filename=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"
     strFileName = getFileNamefromPath(getTextfromBin(sCome,posB,posE-posB))
     posB = instrb(posB,binData,getSBfromDb("Content-Type:")) + 14
     posE = instrb(posB,binData,bincrlf)
     ‘’response.Write "content-type=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"
     strContentType = getTextfromBin(sCome,posB,posE-posB)

     posB = posE + 4     ‘’这个地方换了两行,具体参看输出的原始二进制数据
     posE = instrb(posB,binData,binSub)
     ‘’response.Write "image data="
    
     ‘’saveBin2File sCome,posB,posE-posB-1,server.MapPath("./") & "\test.jpg"
     ‘’Response.Write "<img src=‘’test.jpg‘’ border=0><br>"
     posFileBegin = posB
     posFileLen = posE-posB-1
     strValue = strFileName & "," & strContentType & "," & posFileBegin & "," & posFileLen
    else
     ‘’Response.Write "没有上传文件!" & "<br>"
     strValue = ""
    end if
   else
    posB = posE + 4     ‘’这个地方换了两行,具体参看输出的原始二进制数据
    posE = instrb(posB,binData,binCrlf)
    ‘’Response.Write "value=" & getTextfromBin(sCome,posB,posE-posB) & "<br>"  ‘’这个后面没有“"”,所以不用-1
    strValue = getTextfromBin(sCome,posB,posE-posB)
   end if
  
   dicData.Add strName,strValue
   
   posB = posE + 2
  
   posB = instrb(posB,binData,bincrlf) + 2
   posB = instrb(posB,binData,getSBfromDB("name=""")) + 6
  loop
  
  strTitle = dicData.Item("txtTitle")
  aryFileInfo = dicData.Item("filImage")
  if aryFileInfo <> "" then         ‘’有文件数据上传
   aryFileInfo = split(aryFileInfo,",")
   strFileName = aryFileInfo(0)
   strContentType = aryFileInfo(1)
   posFileBegin = aryFileInfo(2)
   posFileLen = aryFileInfo(3)
   
   sCome.Position = posFileBegin-1
   binData = sCome.Read(posFileLen)
        
   dim cn, rs, sql
   set cn = server.CreateObject("adodb.connection")
   cn.Open cnstr
   set rs = server.CreateObject("adodb.recordset")
   sql = "select title,[content-type],image from tblImage2"
   rs.Open sql,cn,1,3
   rs.AddNew
   rs.Fields("title").Value = strTitle
   rs.Fields("content-type").Value = strContentType
   
   ‘’数据保存到数据库
   rs.Fields("image").AppendChunk binData

   ‘’如果数据以文件形式保存到磁盘上,用下面这句
   ‘’saveBin2File sCome,posFileBegin,posFileLen,server.MapPath("./") & strFileName

   rs.Update
   rs.Close
   set rs = nothing
   cn.Close
   set cn = nothing
   
   Response.Write "<p>文件保存成功!</p>"
  else
   Response.Write "<p>没有上传文件!</p>"
  end if
  
  sCome.Close
  set sCome = nothing  
 else
%>
  <form id="frmUpload" name="frmUpload" action="<%=Request.ServerVariables("script_name")%>" method="post" target="_self" enctype="multipart/form-data">
   <p>标题:<input id="txtTitle" type="text" name="txtTitle" size="40"></p>
   <p>图片:<INPUT id="filImage" type="file" name="filImage" size="40"></p>
   <INPUT id="btnUpload" type="submit" value="Upload" name="btnUpload">
  </form>
<%
 end if
%>
 </body>
</HTML>

待续...

原文转自:http://www.ltesting.net