然而有些情况只需要传递几个文件，而且文件体积并不太大，这种情况下使用组件则有点牛刀杀鸡的感觉，通过html自带的表单就可以实现需要的功能，关键在于后台接收程序的处理。

php处理上传做的很方便，上传文件的信息通过服务器自动处理到$_FILES数组中，开发者只需要使用的内置处理函数简单操作就可以啦。ASP开发者则没有这么幸运，官方并没有提供直接的处理方法，需要开发者自己设计，这时就需要开发者了解IIS对enctype="multipart/form-data"表单的处理方式，IIS把enctype="multipart/form-data"表单提交的数据存储成二进制数据，以二进制格式返回给开发者，开发者则需要通过LenB、MidB的字节处理函数来分析获取的上传内容，客户端发送的具体表单数据格式，可以了解下HTTP RFC1867协议传输格式方面的知识。

下面是我处理多个文件上传的方法，包括php和asp两个版本。

php：WEBSITE_DIRROOT代表网站根目录：

/*

* class: 文件上传类

* author: 51JS.COM-ZMM

* date: 2011.1.20

* email: 304924248@qq.com

* blog: http://www.cnblogs.com/cnzmm/

*/

class Upload {

public $up_ext=array(), $up_max=5210, $up_dir;

private $up_name, $up_rename=true, $up_num=0, $up_files=array(), $up_ret=array();

function __construct($name, $ext=array(), $rename=true) {

if (!empty($name)) {

$this->up_name = $name;

!empty($ext) && $this->up_ext = $ext;

$this->up_rename = $rename;

$this->up_dir = WEBSITE_DIRROOT.

$GLOBALS['cfg_upload_path'];

$this->InitUpload();

} else {

exit('upload文件域名称为空，初始化失败！');

}

}

private function InitUpload() {

if (is_array($_FILES[$this->up_name])) {

$up_arr = count($_FILES[$this->up_name]);

$up_all = count($_FILES[$this->up_name], 1);

$up_cnt = ($up_all - $up_arr) / $up_arr;

for ($i = 0; $i < $up_cnt; $i ++) {

if ($_FILES[$this->up_name]['error'][$i] != 4) {

$this->up_files[] = array(

'tmp_name' => $_FILES[$this->up_name]['tmp_name'][$i],

'name' => $_FILES[$this->up_name]['name'][$i],

'type' => $_FILES[$this->up_name]['type'][$i],

'size' => $_FILES[$this->up_name]['size'][$i],

'error' => $_FILES[$this->up_name]['error'][$i]

);

}

}

$this->up_num = count($this->up_files);

} else {

if (isset($_FILES[$this->up_name])) {

$this->up_files = array(

'tmp_name' => $_FILES[$this->up_name]['tmp_name'],

'name' => $_FILES[$this->up_name]['name'],

'type' => $_FILES[$this->up_name]['type'],

'size' => $_FILES[$this->up_name]['size'],

'error' => $_FILES[$this->up_name]['error']

);

$this->up_num = 1;

} else {

exit('没找找到需要upload的文件！');

}

}

$this->ChkUpload();

}

private function ChkUpload() {

if (empty($this->up_ext)) {

$up_mime = array('image/wbmp', 'image/bmp', 'image/gif', 'image/pjpeg', 'image/x-png');

foreach ($this->up_files as $up_file) {

$up_allw = false;

foreach ($up_mime as $mime) {

if ($up_file['type'] == $mime) {

$up_allw = true; break;

}

}

!$up_allw && exit('不允许上传'.$up_file['type'].'格式的文件！');

if ($up_file['size'] / 1024 > $this->up_max) {

exit('不允许上传大于 '.$this->up_max.'K 的文件！');

}

}

} else {

foreach ($this->up_files as $up_file) {

$up_ext = end(explode('.', $up_file['name']));

$up_allw = false;

foreach ($this->up_ext as $ext) {

if ($up_ext == $ext) {

$up_allw = true; break;

}

}

!$up_allw && exit('不允许上传.'.$up_ext.'格式的文件！');

if ($up_file['size'] / 1024 > $this->up_max) {

exit('不允许上传大于 '.$this->up_max.'K 的文件！');

}

}

}

$this->Uploading();

}

private function Uploading() {

if (IO::DIRCreate($this->up_dir)) {

if (chmod($this->up_dir, 0777)) {

if (!empty($this->up_files)) {

foreach ($this->up_files as $up_file) {

if (is_uploaded_file($up_file['tmp_name'])) {

$file_name = $up_file['name'];

if ($this->up_rename) {

$file_ext = end(explode('.', $file_name));

$file_rnd = substr(md5(uniqid()), mt_rand(0, 26), 6);

$file_name = date('ymdHis').'_'.$file_rnd.'.'.$file_ext;

}

$file_name = $this->up_dir.'/'.$file_name;

if (move_uploaded_file($up_file['tmp_name'], $file_name)) {

$this->up_ret[] = str_replace(WEBSITE_DIRROOT, '', $file_name);

} else {

exit('文件上传失败！');

}

}

}

}

} else {

exit('未开启写入权限！');

}

} else {

exit('上传目录创建失败！');

}

}

public function GetUpload() {

return empty($this->up_ret) ? false : $this->up_ret;

}

function __destruct() {}

}

?>

asp：

Class MultiUpload

REM PUBLIC-VARIANT

Public Form, IsFinished

Private bVbCrlf, bSeparate, fPassed, formData, fileType, fileSize, folderPath, _

fRename, fIMGOnly, itemCount, chunkSize, bTime, sErrors, sAuthor, sVersion

Private itemStart(), itemLength(), dataStart(), dataLength(), itemName(), itemData(), extenArr(), httpArr()

REM CLASS-INITIALIZE

Private Sub Class_Initialize

Call InitVariant

Server.ScriptTimeOut = 1800

Set Form = Server.CreateObject("Scripting.Dictionary")

sAuthor = "51JS.COM-ZMM"

sVersion = "MultiUpload Class 3.0"

End Sub

REM CLASS-ATTRIBUTES

Public Property Let AllowType(byVal sType)

Dim regEx

Set regEx = New RegExp

regEx.Pattern = "^(\w+\|)*\w+$"

regEx.Global = False

regEx.IgnoreCase = True

If regEx.Test(sType) Then fileType = "|" & Ucase(sType) & "|"

Set regEx = Nothing

End Property

Public Property Let MaxSize(byVal sSize)

If IsNumeric(sSize) Then fileSize = CDbl(FormatNumber(CCur(sSize), 2))

End Property

Public Property Let SaveFolder(byVal sFolder)

folderPath = sFolder

End Property

Public Property Let CommonPassed(byVal bCheck)

fPassed = bCheck

End Property

Public Property Let FileRenamed(byVal bRename)

fRename = bRename

End Property

Public Property Let FileIsAllImg(byVal bOnly)

fIMGOnly = bOnly

End Property

Public Property Get SaveFolder

SaveFolder = folderPath

End Property

Public Property Get FileRenamed

FileRenamed = fRename

End Property

Public Property Get FileIsAllImg

FileIsAllImg = fIMGOnly

End Property

Public Property Get ErrMessage

ErrMessage = sErrors

End Property

Public Property Get ClsAuthor

ClsAuthor = sAuthor

End Property

Public Property Get ClsVersion

ClsVersion = sVersion

End Property

REM CLASS-METHODS

Private Function InitVariant

IsFinished = False

bVbCrlf = StrToByte(vbCrlf & vbCrlf)

bSeparate = StrToByte(String(29, "-"))

fPassed = False

fileType = "*"

fileSize = "*"

fRename = True

fIMGOnly = True

itemCount = 0

chunkSize = 1024 * 128

bTime = Now

sErrors = ""

End Function

Public Function GetUploadData

Dim curRead : curRead = 0

Dim dataLen : dataLen = Request.TotalBytes

Dim appName : appName = "PROGRESS" & IPToNum(GetClientIPAddr)

Dim streamTmp

Set streamTmp = Server.CreateObject("ADODB.Stream")

streamTmp.Type = 1

streamTmp.Open

Do While curRead < dataLen

Dim partLen : partLen = chunkSize

If partLen + curRead > dataLen Then partLen = dataLen - curRead

streamTmp.Write Request.BinaryRead(partLen)

curRead = curRead + partLen

LetProgress appName, Array(curRead, dataLen, DateDiff("s", bTime, Now), folderPath)

Loop

streamTmp.Position = 0

formData = streamTmp.Read(dataLen)

streamTmp.Close

Set streamTmp = Nothing

Call ItemPosition

End Function

Private Function LetProgress(byVal sName, byVal vArr)

Application.Value(sName) = Join(vArr, "|")

End Function

Private Function DelProgress

Application.Contents.Remove("PROGRESS" & IPToNum(GetClientIPAddr))

End Function

Private Function ItemPosition

Dim iStart, iLength : iStart = 1

Do Until InStrB(iStart, formData, bSeparate) = 0

iStart = InStrB(iStart, formData, bSeparate) + LenB(bSeparate) + 14

iLength = InStrB(iStart, formData, bSeparate) - iStart - 2

If Abs(iStart + 2 - LenB(formData)) > 2 Then

ReDim Preserve itemStart(itemCount)

ReDim Preserve itemLength(itemCount)

itemStart(itemCount) = iStart

itemLength(itemCount) = iLength

itemCount = itemCount + 1

End If

Loop

Call FillItemValue

End Function

Private Function FillItemValue

Dim dataPart, bInfor

Dim iStart : iStart = 1

Dim iCount : iCount = 0

Dim iCheck : iCheck = StrToByte("filename")

For i = 0 To itemCount - 1

ReDim Preserve itemName(iCount)

ReDim Preserve itemData(iCount)

ReDim Preserve extenArr(iCount)

ReDim Preserve httpArr(iCount)

ReDim Preserve dataStart(iCount)

ReDim Preserve dataLength(iCount)

dataPart = MidB(formData, itemStart(i), itemLength(i))

iStart = InStrB(1, dataPart, ChrB(34)) + 1

iLength = InStrB(iStart, dataPart, ChrB(34)) - iStart

itemName(iCount) = GetItemName(MidB(dataPart, iStart, iLength))

iStart = InStrB(1, dataPart, bVBCrlf) + 4

iLength = LenB(dataPart) - iStart + 1

If InStrB(1, dataPart, iCheck) > 0 Then

bInfor = MidB(dataPart, 1, iStart - 5)

extenArr(iCount) = FileExtenName(bInfor)

httpArr(iCount) = GetHttpContent(bInfor)

If IsNothing(extenArr(iCount)) Then

itemData(iCount) = ""

dataStart(iCount) = ""

dataLength(iCount) = ""

Else

If Mid(folderPath, Len(folderPath) - 1) = "/" Then

If fRename Then

itemData(iCount) = folderPath & GetRandomName(6) & extenArr(iCount)

Else

itemData(iCount) = folderPath & GetClientName(bInfor) & extenArr(iCount)

End If

Else

If fRename Then

itemData(iCount) = folderPath & "/" & GetRandomName(6) & extenArr(iCount)

Else

itemData(iCount) = folderPath & "/" & GetClientName(bInfor) & extenArr(iCount)

End If

End If

dataStart(iCount) = itemStart(i) + iStart - 2

dataLength(iCount) = iLength

End If

Else

extenArr(iCount) = ""

httpArr(iCount) = ""

itemData(iCount) = ByteToStr(MidB(dataPart, iStart, iLength))

dataStart(iCount) = ""

dataLength(iCount) = ""

End If

iCount = iCount + 1

Next

Call ItemToColl

End Function

Private Function GetItemName(byVal bName)

GetItemName = ByteToStr(bName)

End Function

Private Function ItemToColl

For i = 0 To itemCount - 1

If Not Form.Exists(itemName(i)) Then

Form.Add itemName(i), itemData(i)

End If

Next

End Function

Private Function FileExtenName(byVal bInfor)

Dim pContent, regEx

pContent = GetClientPath(bInfor)

If IsNothing(pContent) Then

FileExtenName = ""

Else

Set regEx = New RegExp

regEx.Pattern = "^.+(\.[^\.]+)$"

regEx.Global = False

regEx.IgnoreCase = True

FileExtenName = regEx.Replace(pContent, "$1")

Set regEx = Nothing

End If

End Function

Private Function GetHttpContent(byVal bInfor)

Dim sInfor, regEx

sInfor = ByteToStr(bInfor)

Set regEx = New RegExp

regEx.Pattern = "^[\S\s]+Content-Type:([\S\s]+)$"

regEx.Global = False

regEx.IgnoreCase = True

GetHttpContent = Trim(regEx.Replace(sInfor, "$1"))

Set regEx = Nothing

End Function

Private Function GetRandomName(byVal sLen)

Dim regEx, sTemp, arrFields, n : n = 0

Set regEx = New RegExp

regEx.Pattern = "[^\d]+"

regEx.Global = True

regEx.IgnoreCase = True

sTemp = regEx.Replace(Now, "") & "-"

Set regEx = Nothing

arrFields = Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", _

"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", _

"k", "l", "m", "n", "o", "p", "q", "r", "s", "t", _

"u", "v", "w", "x", "y", "z", "A", "B", "C", "D", _

"E", "F", "G", "H", "I", "J", "K", "L", "M", "N", _

"O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", _

"Y", "Z")

Randomize

Do While n < sLen

sTemp = sTemp & CStr(arrFields(61 * Rnd))

n = n + 1

Loop

GetRandomName = sTemp

End Function

Private Function GetClientName(byVal bInfor)

Dim pContent, regEx

pContent = GetClientPath(bInfor)

If IsNothing(pContent) Then

GetClientName = ""

Else

Set regEx = New RegExp

regEx.Pattern = "^.*\\([^\.]*)[^\\]+$"

regEx.Global = False

regEx.IgnoreCase = True

GetClientName = regEx.Replace(pContent, "$1")

Set regEx = Nothing

End If

End Function

Private Function GetClientPath(byVal bInfor)

Dim sInfor, pStart, pLength, pContent

sInfor = ByteToStr(bInfor)

pStart = InStr(1, sInfor, "filename=" & Chr(34)) + 10

pLength = InStr(pStart, sInfor, Chr(34)) - pStart

pContent = Mid(sInfor, pStart, pLength)

GetClientPath = pContent

End Function

Public Function SaveUploadFile

Dim isValidate

Dim filePath, oStreamGet, oStreamPut

isValidate = fPassed And CheckFile

If isValidate Then

For i = 0 To itemCount - 1

If Not IsNothing(dataStart(i)) And Not IsNothing(dataLength(i)) Then

If dataLength(i) = 0 Then

itemData(i) = ""

Else

filePath = Server.MapPath(itemData(i))

If CreateFolder("|", ParentFolder(filePath)) Then

Set oStreamGet = Server.CreateObject("ADODB.Stream")

oStreamGet.Type = 1

oStreamGet.Mode = 3

oStreamGet.Open

oStreamGet.Write formData

oStreamGet.Position = dataStart(i)

Set oStreamPut = Server.CreateObject("ADODB.Stream")

oStreamPut.Type = 1

oStreamPut.Mode = 3

oStreamPut.Open

oStreamPut.Write oStreamGet.Read(dataLength(i))

oStreamPut.SaveToFile filePath, 2

oStreamGet.Close

Set oStreamGet = Nothing

oStreamPut.Close

Set oStreamPut = Nothing

End If

End If

End If

Next

IsFinished = True

Else

IsFinished = False

End If

End Function

Private Function CheckFile

Dim oBoolean : oBoolean = True

CheckFile = oBoolean And CheckType And CheckSize

End Function

Private Function CheckType

Dim oBoolean : oBoolean = True

If fileType = "*" Then

oBoolean = oBoolean And True

Else

For i = 0 To itemCount - 1

If Not IsNothing(extenArr(i)) Then

If InStr(1, fileType, "|" & Ucase(Mid(extenArr(i), 2)) & "|") > 0 Then

If fIMGOnly Then

Dim sAllow : sAllow = "|GIF|PJPEG|X-PNG|BMP|"

Dim aCheck : aCheck = Split(UCase(httpArr(i)), "/")

Dim iCheck : iCheck = "|" & aCheck(Ubound(aCheck)) & "|"

If InStr(1, sAllow, iCheck, 1) > 0 Then

oBoolean = oBoolean And True

Else

sErrors = sErrors & "表单 [ " & itemName(i) & " ] 的文件格式错误！\n" & _

"支持的格式为：" & Replace(Mid(fileType, 2, Len(fileType) - 1), "|", " ") & "\n\n"

oBoolean = oBoolean And False

End If

Else

oBoolean = oBoolean And True

End If

Else

sErrors = sErrors & "表单 [ " & itemName(i) & " ] 的文件格式错误！\n" & _

"支持的格式为：" & Replace(Mid(fileType, 2, Len(fileType) - 1), "|", " ") & "\n\n"

oBoolean = oBoolean And False

End If

End If

Next

End If

CheckType = oBoolean

End Function

Private Function CheckSize

Dim oBoolean : oBoolean = True

If fileSize = "*" Then

oBoolean = oBoolean And True

Else

For i = 0 To itemCount - 1

If Not IsNothing(dataLength(i)) Then

Dim tmpSize : tmpSize = CDbl(FormatNumber(CCur(dataLength(i)) / 1024, 2))

If tmpSize <= fileSize Then

oBoolean = oBoolean And True

Else

sErrors = sErrors & "表单 [ " & itemName(i) & " ] 的文件大小 (" & tmpSize & " KB) 超出范围！\n" & _

"支持大小范围：<= " & fileSize & " KB\n\n"

oBoolean = oBoolean And False

End If

End If

Next

End If

CheckSize = oBoolean

End Function

Private Function CreateFolder(byVal sLine, byVal sPath)

Dim oFso

Set oFso = Server.CreateObject("Scripting.FileSystemObject")

If Not oFso.FolderExists(sPath) Then

Dim regEx

Set regEx = New RegExp

regEx.Pattern = "^(.*)\\([^\\]*)$"

regEx.Global = False

regEx.IgnoreCase = True

sLine = sLine & regEx.Replace(sPath, "$2") & "|"

sPath = regEx.Replace(sPath, "$1")

If CreateFolder(sLine, sPath) Then CreateFolder = True

Set regEx = Nothing

Else

If sLine = "|" Then

CreateFolder = True

Else

Dim sTemp : sTemp = Mid(sLine, 2, Len(sLine) - 2)

If InStrRev(sTemp, "|") = 0 Then

sLine = "|"

sPath = sPath & "\" & sTemp

Else

Dim Folder : Folder = Mid(sTemp, InStrRev(sTemp, "|") + 1)

sLine = "|" & Mid(sTemp, 1, InStrRev(sTemp, "|") - 1) & "|"

sPath = sPath & "\" & Folder

End If

oFso.CreateFolder sPath

If CreateFolder(sLine, sPath) Then CreateFolder = True

End if

End If

Set oFso = Nothing

End Function

Private Function ParentFolder(byVal sPath)

Dim regEx

Set regEx = New RegExp

regEx.Pattern = "^(.*)\\[^\\]*$"

regEx.Global = True

regEx.IgnoreCase = True

ParentFolder = regEx.Replace(sPath, "$1")

Set regEx = Nothing

End Function

Private Function IsNothing(byVal sVar)

IsNothing = CBool(sVar = Empty)

End Function

Private Function StrPadLeft(byVal sText, byVal sLen, byVal sChar)

Dim sTemp : sTemp = sText

Do While Len(sTemp) < sLen : sTemp = sChar & sTemp : Loop

StrPadLeft = sTemp

End Function

Private Function StrToByte(byVal sText)

For i = 1 To Len(sText)

StrToByte = StrToByte & ChrB(Asc(Mid(sText, i, 1)))

Next

End Function

Private Function ByteToStr(byVal sByte)

Dim oStream

Set oStream = Server.CreateObject("ADODB.Stream")

oStream.Type = 2

oStream.Mode = 3

oStream.Open

oStream.WriteText sByte

oStream.Position = 0

oStream.CharSet = "gb2312"

oStream.Position = 2

ByteToStr = oStream.ReadText

oStream.Close

Set oStream = Nothing

End Function

Private Function GetClientIPAddr

If IsNothing(GetServerVar("HTTP_X_FORWARDED_FOR")) Then

GetClientIPAddr = GetServerVar("REMOTE_ADDR")

Else

GetClientIPAddr = GetServerVar("HTTP_X_FORWARDED_FOR")

End If

End Function

Private Function GetServerVar(byVal sText)

GetServerVar = Request.ServerVariables(sText)

End Function

Private Function IPToNum(byVal sIp)

Dim sIp_1, sIp_2, sIp_3, sIp_4

If IsNumeric(Left(sIp, 2)) Then

sIp_1 = Left(sIp, InStr(sIp, ".") - 1)

sIp = Mid(sIp, InStr(sIp, ".") + 1)

sIp_2 = Left(sIp, InStr(sIp, ".") - 1)

sIp = Mid(sIp, InStr(sIp, ".") + 1)

sIp_3 = Left(sIp, InStr(sIp, ".") - 1)

sIp_4 = Mid(sIp, InStr(sIp, ".") + 1)

End If

IPToNum = CInt(sIp_1) * 256 * 256 * 256 + CInt(sIp_2) * 256 * 256 + CInt(sIp_3) * 256 + CInt(sIp_4) - 1

End Function

REM CLASS-TERMINATE

Private Sub Class_Terminate

Call DelProgress

Form.RemoveAll

Set Form = Nothing

End Sub

End Class

%>

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