大家经常探讨使用asp，而不使用其他组建能否实现文件的上传，从而开发出支持邮件附件的邮件系统，答案是可以的。请看：
以下是发送邮件的页面，邮件的帐号是员工号，假设是5位的数字，sendmail.asp当然是在合法登陆后才能够看到的
邮件系统
<%
meth=request.querystring("meth")
if meth=1 then
geterempl=trim(request.querystring("geterempl"))
emailtitle=trim(request.querystring("emailtitle"))
elseif meth=2 then
mailid=trim(request.querystring("mailid"))
set conn=server.createobject("adodb.connection")
conn.open "DSN=;UID=;PWD="
dsnpath="DSN=;UID=;PWD="
set rs=server.createobject("adodb.recordset")
selectnew="select * from t_mail where ((geterempl like '%"&session("myid")&"%' or deleempl like '%"&session("myid")&"%' or receempl like '%"&session("myid")&"%')and (not deleverempl like '%"&session("myid")&"%')) and mailid='"&mailid&"' "
rs.open selectnew,dsnpath,3,3
if rs.bof or rs.eof then
%>
<%
response.end
else
body=rs("body")
emailtitle=rs("emailtitle")
rs.close
set rs=nothing
conn.close
set conn=nothing
end if
end if
%>
这次讲到的是处理发送的页面，前一部分是得到发送者ip地址和mac地址，并且禁止用户自己更改自己ip地址的代码，因为我们的系统是需要对个人修改ip的行为进行禁止的。
<%
strIP = Request.ServerVariables("REMOTE_ADDR")
Set net = Server.CreateObject("wscript.network")
Set sh = Server.CreateObject("wscript.shell")
sh.run "%comspec% /c nbtstat -A " & strIP & " > c:\" & strIP & ".txt",0,true
Set sh = nothing
Set fso = createobject("scripting.filesystemobject")
Set ts = fso.opentextfile("c:\" & strIP & ".txt")
macaddress = null
Do While Not ts.AtEndOfStream
data = ucase(trim(ts.readline))
If instr(data,"MAC ADDRESS") Then
macaddress = trim(split(data,"=")(1))
Exit Do
End If
loop
ts.close
Set ts = nothing
fso.deletefile "c:\" & strIP & ".txt"
Set fso = nothing
GetMACAddress = macaddress
strMac = GetMACAddress
set conn=server.CreateObject("adodb.connection")
conn.open "DSN=;UID=;PWD="
dsnpath="DSN=;UID=;PWD="
set rs=server.CreateObject("adodb.recordset")
sele="select * from getmac where g_mac='"&strMac&"'"
rs.open sele,dsnpath
if rs.bof then
set conn=server.CreateObject("adodb.connection")
conn.open "DSN=;UID=;PWD="
dsnpath="DSN=;UID=;PWD="
set rs=server.CreateObject("adodb.recordset")
g_id=mid(strIP,9)
g_id=left(g_id,2)
'response.write g_id
if isnumeric(g_id) then
g_id=cint(g_id)
else
g_id=0
end if
sele="insert into getmac(g_ip,g_mac,g_id,g_ok) values('"&strIP&"','"&strMac&"',"&g_id&",0)"
rs.open sele,dsnpath
else
set conn=server.CreateObject("adodb.connection")
conn.open "DSN=;UID=;PWD="
dsnpath="DSN=;UID=;PWD="
set rs=server.CreateObject("adodb.recordset")
sele="select * from getmac where g_ip='"&trim(strIP)&"' and g_mac='"&trim(strMac)&"'"
rs.open sele,dsnpath
if rs.bof or rs.eof then
set rs1=server.CreateObject("adodb.recordset")
sele="insert into badmac(ip, mac ,thetime) values('"&strIP&"','"&strMac&"','"&now()&"')"
rs1.open sele,dsnpath
response.redirect("/reg/wrong.asp")
response.end
end if
end if
%>
邮件系统
<%
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
'response.write varbytecount
bnCRLF = chrB( 13 ) & chrB( 10 )
binHTTPHeader=Request.BinaryRead(varByteCount)
'response.write vbenter
'response.write "
"& cstr(binhttpheader) &"
"
sread=0
eread=0
'开始读非文件域的数据
set conn = Server.CreateObject("ADODB.Connection")
conn.open "DSN=;UID=;PWD="
SQL="select * from t_mail where mailid=0"
set rs=server.CreateObject("ADODB.Recordset")
rs.Open sql,conn,3,3
rs.addnew
rs("emaillevel")=0
rs("receempl")=""
Do while lenB(binHTTPHeader)>46
Divider = LEFTb( binHTTPHeader, INSTRB( binHTTPHeader, bnCRLF ) - 1 )
binHeaderData = Leftb(binHTTPHeader, INSTRB( binHTTPHeader, bnCRLF & bnCRLF )-1)
strHeaderData=bin2str(binHeaderData)
lngFieldNameStart=Instr(strHeaderData,"name="&chr(34))+Len("name="&chr(34))
'response.write " lngfieldnamestart:"&lngfieldnamestart
lngFieldNameEnd=Instr(lngFieldNameStart,strHeaderData,chr(34))
'response.write " lngfieldnameEND:"&lngfieldnameEND
strFieldName=Mid(strHeaderData,lngFieldNameStart,lngFieldNameEnd-lngFieldNameStart)
'RESPOnSE.WRITE " STRFIELDNAME:" & STRfieldname
strFieldName=Trim(strFieldName)
strFieldName=Replace(strFieldName,vbcrlf,vbnullstring)
'判断文件数据时候开始
If strComp(strFieldName,"FileUploadStart",1)=0 and sread=0 Then
'response.write "找到了文件开始的地方"
sread=1
'response.write " " & INSTRB( DataStart + 1, binHTTPHeader, divider ) &" "
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," "," ")
'非文件上传域变量赋值
'execute strFieldName&"="""&strFieldValue&""""
'response.write strFieldName&":"&strFieldValue&" "
if strfieldname="geterempl" then
strFieldValue=Replace(strFieldValue,vbcrlf,vbnullstring)
if instr(strfieldvalue,"gr:")=1 then
'邮件组发
'response.write len(trim(strfieldvalue))
if len(trim(strfieldvalue))<>6 then
'格式错误返回
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
else
if not isnumeric(mid(trim(strfieldvalue),4)) then
'格式错误返回
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
else
thegroup=(mid(trim(strfieldvalue),4))
end if
end if
tmpSQL="select * from t_group where owner='"&session("myid")&"' and groupidowner='"&thegroup&"'"
'response.write tmpsql
set tmprs=server.CreateObject("ADODB.Recordset")
tmprs.Open tmpsql,conn
if tmprs.bof or tmprs.eof then
'没有找到该组
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
else
if tmprs("personnum")=0 then
'组内没有用户
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
else
strFieldValue=trim(tmprs("groupempl"))
tmprs.close
set tmprs=nothing
end if
end if
end if
if instr(strfieldValue,"|") then
'组发
allsearch=replace(trim(strfieldValue),"|","','")
allsearch="'"&allsearch&"'"
tmpstring=trim(strfieldValue)&"|"
tosearch=""
do while len(tmpstring)>=5
tosearch=left(tmpstring,5)
tmpstring=mid(tmpstring,7)
if instr(tosearch,"|") then
'格式错误
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
end if
tmpSQL="select * from (select userid from t_officer where userid in ("&allsearch&")) DERIVEDTBL where userid='"&tosearch&"'"
'response.write tmpsql
set tmprs=server.CreateObject("ADODB.Recordset")
tmprs.Open tmpsql,conn
if tmprs.eof or tmprs.bof then
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
end if
tmprs.close
set tmprs=nothing
loop
strfieldValue=trim(strFieldValue)
else
if len(trim(strFieldValue))<>5 then
'格式不正确
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
else
if isnumeric(trim(len(strFieldValue))) then
tmpSQL="select * from t_officer where userid='"&trim(strFieldValue)&"'"
set tmprs=server.CreateObject("ADODB.Recordset")
tmprs.Open tmpsql,conn
if tmprs.eof or tmprs.bof then
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
end if
tmprs.close
set tmprs=nothing
strfieldValue=trim(strFieldValue)
else
%>
尝试发送邮件，但是失败了，请修改错误后重试！
<%
response.end
end if
end if
end if
end if
strFieldValue=replace(strFieldValue,"<","<")
'response.write strfieldname
rs(STRFIELDNAME)=replace(strFieldValue,">",">")
binHTTPHeader=MIDB(binHTTPHeader,INSTRB( DataStart + 1, binHTTPHeader, divider ))
loop
'开始处理文件数据
titem=0
rs("filesize_1")=0
rs("filesize_2")=0
rs("filesize_3")=0
Do while lenB(binHTTPHeader)>46
if INSTRB( binHTTPHeader, bnCRLF & bnCRLF )<>0 then
binHeaderData = LeftB(binHTTPHeader,INSTRB( binHTTPHeader, bnCRLF & bnCRLF )-1)
else
exit do
end if
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
if instr(strheaderdata,"filename=")>0 then
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)
else
strfilename=""
end if
'读取上传文件数据
DataStart = INSTRB( binHTTPHeader, bnCRLF & bnCRLF ) + 4
DataEnd = INSTRB( DataStart + 1, binHTTPHeader, divider ) - DataStart
If strFileName<>"" Then
if dataend>0 then
binFieldValue=MIDB( binHTTPHeader, DataStart, DataEnd )
'将上传的文件写入数据库
titem=titem+1
'response.write "titem:"&titem
rs("FileContentType_"&titem)=strFileContentType
rs("FileContent_"&titem).AppendChunk binFieldValue
rs("filesize_"&titem)=lenb(binFieldValue)
rs("filename_"&titem)=strfilename
else
binfieldvalue=binhttpheader
end if
End if
if INSTRB( DataStart + 1, binHTTPHeader, divider )>0 then
binHTTPHeader=MIDB(binHTTPHeader,INSTRB( DataStart + 1, binHTTPHeader, divider ))
else
binhttpheader=""
end if
loop
rs("sizetotal")=csng(rs("filesize_1"))+csng(rs("filesize_2"))+csng(rs("filesize_3"))+csng(len(rs("body")))+csng(len(rs("emailtitle")))+csng(len(rs("emailshowname")))+csng(len("geterempl"))
if csng(rs("sizetotal"))>=csng(2*1024*1024) then
response.write "对不起,文件太大，请保证每封邮件的总大小不超过2M!"
response.end
end if
rs("mailtime")=now
rs("readerempl")=""
if rs("receempl")<>"" then
rs("receempl")=session("myid")
rs("readerempl")=session("myid")
end if
rs("deleempl")=""
rs("deleverempl")=""
rs("sendmac")=strmac
rs.update
rs.close
set rs=Nothing
conn.Close
set conn=Nothing
%>
最后，我们来讲讲如何把内容从数据库中读出来，内容有这么几类，一类是浏览器上可以显示的，例如*.htm，一类是需要下载的，例如*.exe，还有一种是浏览器可以显示但是不能够让他显示的，例如*.asp，请看代码：
<%
Response.Buffer= true
Response.Clear
function getname(oriname)
thename=oriname
do while instr(thename,"/")>0
thename=mid(thename,instr(thename,"/")+1)
loop
do while instr(thename,"\")>0
thename=mid(thename,instr(thename,"\")+1)
loop
getname=thename
end function
function canexec(thechar)
if instr(thechar,".asp")>0 then
canexec=false
exit function
end if
if instr(thechar,".asa")>0 then
canexec=false
exit function
end if
if instr(thechar,".aspx")>0 then
canexec=false
exit function
end if
if instr(thechar,".asax")>0 then
canexec=false
exit function
end if
canexec=true
end function
mailID=request("mailID")
se=request("se")
if se<>1 and se<>2 and se<>3 then
response.end
end if
Set conn=server.createobject("adodb.connection")
set rs=server.createobject("adodb.recordset")
conn.open "DSN=;UID=;PWD="
sql="select * from t_mail where ((geterempl like '%"&session("myid")&"%' or deleempl like '%"&session("myid")&"%' or receempl like '%"&session("myid")&"%' ) and (not deleverempl like '%"&session("myid")&"%')) and mailid='"&mailid&"' "
rs.open sql,conn,3,3
if rs.eof or rs.bof then
response.end
end if
if rs("filecontenttype_"&trim(se))<>"text/plain" or (not canexec(getname(trim(rs("filename_"&trim(se)))))) then
Response.ContentType = rs("FileContentType_"&trim(se))
end if
'Response.AddHeader "content-type","application/x-msdownload"
if instr(response.contenttype,"application")>0 then
response.AddHeader "Content-Disposition","attachment;filename="&getname(trim(rs("filename_"&trim(se))))
end if
Response.BinaryWrite rs("FileContent_"&trim(se))
rs.close
set rs=Nothing
conn.close
set conn=nothing
%>
文章到这里就结束了，至于邮件数据库的数据结构大家根据代码自己琢磨吧！
