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使用ASP实现支持附件的邮件系统

类别: ASP教程

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

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link rel="stylesheet" type="text/css" href="/css/FORUM.CSS">
<style type=text/css>

</style>
<title>邮件系统</title></head>
<body bgcolor="#FEF7ED">
<script language="javascript">
<%
if session("myid")="" or len(session("myid"))<>5 then
response.write "window.open(\'nolog.asp\',target=\'_top\');"
end if
%>
function check(theform)
{

if (theform.geterempl.value==\'\')
{
alert(\'请输入收件人！\');
theform.geterempl.focus();
return false;
}
if (theform.emailtitle.value==\'\')
{
alert(\'请输入主题!\');
theform.emailtitle.focus();
return false;
}
if (theform.emailtitle.value.length>200)
{
alert(\'主题请少于200字节\');
theform.emailtitle.focus();
return false;
}
if (theform.body.value.length>15*1024)
{
alert(\'正文请少于16K\');
theform.body.focus();
return false;
}
if (theform.emailshowname.value.length>1024)
{
alert(\'签名请少于1K\');
theform.emailshowname.focus();
return false;
}

}
</script>
<%
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
%>
<script language="javascript">
alert("您没有查看这封邮件的权限！");
window.history.back();
</script>
<%
response.end
else
body=rs("body")
emailtitle=rs("emailtitle")
rs.close
set rs=nothing
conn.close
set conn=nothing
end if
end if
%>
<Form name="upload_file" onSubmit="return check(this)" action="loadmail.asp" method=post enctype="multipart/form-data" >
<table width="100%" border="0" cellspacing="2" cellpadding="2">
<tr>
<td width="11%">
<div align="right">发件人:</div>
</td>
<td width="89%">
<input type="hidden" name="senderempl" value="<%=session("myid")%>">
<%=session("myid")%> </td>
</tr>
<tr>
<td width="11%">
<div align="right">收件人:</div>
</td>
<td width="89%">
<input type="text" name="geterempl" size="40" value="<%=geterempl%>">
<input type="checkbox" name="emaillevel" value="1" style="background-color: #FEF7ED">
紧急信件 </td>
</tr>
<tr>
<td width="11%" valign="top"> </td>
<td width="89%">发送多个人的时候可以使用"<font color="#9999FF">|</font>"隔开,例如:<font color="#3399FF">01234|01235|01236</font>,第一位和最后一位不需要"<font color="#9999FF">|</font>"<br>
<font color="#FF0000">新功能</font>：您可以把信信直接发送给您设定的<a href="group.asp">某用户</a>，发送格式为：gr:组序号，例如<font color="#0099FF">gr:001</font></td>
</tr>
<tr>
<td width="11%">
<div align="right"></div>
</td>
<td width="89%">
<input type="checkbox" name="receempl" value="1" style="background-color: #FEF7ED">
保存一份到收藏夹[<font color="#3399FF">选定此项，则邮件发送到对方邮箱的同时发送到自己的收藏夹里</font>]</td>
</tr>
<tr>
<td width="11%" valign="top"> </td>
<td width="89%"> </td>
</tr>
<tr>
<td width="11%" align="right"> 主题:</td>
<td width="89%">
<input type="text" name="emailtitle" size="60" value="<%=emailtitle%>">
</td>
</tr>
<tr>
<td width="11%" valign="top">
<div align="right">正文:</div>
</td>
<td width="89%">
<TEXTAREA name=body rows=8 cols=60><%=body%></TEXTAREA>
</td>
</tr>
<tr>
<td width="11%" valign="top">
<div align="right">签名:</div>
</td>
<td width="89%">
<textarea name="emailshowname" cols="30" rows="6"><%=application(session("myid")&"_name")%></textarea>
</td>
</tr>
<tr>
<td width="11%">
<div align="right">
<input type=hidden name="FileUploadStart">
附件1: </div>
</td>
<td width="89%">
<input type="file" name="file_up" size="50">
</td>
</tr>
<tr>
<td width="11%">
<div align="right">附件2:</div>
</td>
<td width="89%">
<input type="file" name="file_up1" size="50">
</td>
</tr>
<tr>
<td width="11%">
<div align="right">附件3:</div>
</td>
<td width="89%">
<input type="file" name="file_up2" size="50">
<input type=hidden name="FileUploadEnd">
</td>
</tr>
<tr>
<td width="11%">
<div align="right"></div>
</td>
<td width="89%">
<input type=submit value=确定 >
</td>
</tr>
</table>
</Form>
</body>
</html>

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
%>
<html>
<head>
<link rel="stylesheet" type="text/css" href="/css/FORUM.CSS">
<style type=text/css>

</style>
<title>邮件系统</title></head><body bgcolor="#FEF7ED">
<%
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 "<br><br>"& cstr(binhttpheader) &"<br><br>"

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 "<br>lngfieldnamestart:"&lngfieldnamestart
lngFieldNameEnd=Instr(lngFieldNameStart,strHeaderData,chr(34))
\'response.write "<br>lngfieldnameEND:"&lngfieldnameEND

strFieldName=Mid(strHeaderData,lngFieldNameStart,lngFieldNameEnd-lngFieldNameStart)

\'RESPOnSE.WRITE "<BR>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 "<br>" & INSTRB( DataStart + 1, binHTTPHeader, divider ) &"<br>"
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&"<br>"

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！
<script language="javascript">
alert("您输入的收件组格式错误！r正确的格式是:\'gr:001\'");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件组格式错误！r正确的格式是:\'gr:001\'");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件组<%=thegroup%>没有找到！");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件组<%=thegroup%>中目前没有任何的用户n所以不能发送");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件人格式错误!");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件人<%=tosearch%>没有找到!");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件人<%=trim(strFieldValue)%>不正确!");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件人<%=trim(strFieldValue)%>没有找到r该员工可能还没有注册!");
history.back();
</script>
<p>
<%
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！
<script language="javascript">
alert("您输入的收件人<%=trim(strFieldValue)%>不正确!");
history.back();
</script>

<p> <%
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

%>
<script language=javascript>
window.open("mailok.asp",target="_self")
</script>
</body></html>

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
%>

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