AspUpload是一个功能强大的ASP上传组件，能够方便地实现文件上传功能。在ASP开发中，文件上传是一项非常常见的功能，但是ASP原生的文件上传功能太过简单，不方便实现更加复杂的文件上传功能。而使用AspUpload，可以轻松地实现文件上传，并且还可以支持多种文件类型和对上传文件的检查。下面带大家详解AspUpload。

一、AspUpload的基本介绍

AspUpload是一个基于ASP的文件上传组件，可以支持文件上传、文件下载、图像处理和其他和文件相关的操作。它支持多种文件类型和对上传文件的检查。可以上传多个文件，还支持上传进度条实时监测等高端功能。

二、基本操作

1.安装

在使用AspUpload前，需要先安装AspUpload组件。下载后将其复制到服务器上的一个目录下，并在ASP中使用组件。安装过程非常简单。

2.文件上传实现

文件上传是AspUpload最常用的功能。使用AspUpload上传文件非常简单。以下是一个完整的代码示例：

```

<%@ Language=VBScript %>

<%

'Declare the required variables

Dim objUpload, objFile, strPath

'Create the instance of Upload

Set objUpload = Server.CreateObject("Persits.Upload.1")

'Set the path where the uploaded file will be saved

'Change "c:\uploads" to the desired physical path

strPath = "c:\uploads"

'Save the uploaded file

Set objFile = objUpload.Files("File1")

'Check whether the file was successfully uploaded

If Not objFile Is Nothing Then

objFile.SaveAs(strPath & "\" & objFile.FileName)

Response.Write "The file has been uploaded successfully."

Else

Response.Write "An error occurred while uploading the file."

End If

'Set the object to Nothing, clearing memory

Set objUpload = Nothing

Set objFile = Nothing

%>

```

以上代码实现了将用户上传的文件保存在指定位置的功能。

三、多文件上传

文件上传功能不再局限于单个文件。使用AspUpload，可以轻松地实现批量上传文件。以下是一个实现多文件上传的示例：

```

<%@ Language=VBScript %>

<%

'Declare the required variables

Dim objUpload, objFile, strPath, i

'Create the instance of Upload

Set objUpload = Server.CreateObject("Persits.Upload.1")

'Set the path where the uploaded file will be saved

'Change "c:\uploads" to the desired physical path

strPath = "c:\uploads"

'Loop through all uploaded files

For i = 1 To objUpload.Files.Count

'Save each uploaded file

Set objFile = objUpload.Files.Item(i)

If Not objFile Is Nothing Then

objFile.SaveAs(strPath & "\" & objFile.FileName)

End If

Next

'Respond indicating success or failure

If objUpload.Files.Count <> 0 Then

Response.Write "The files have been uploaded successfully."

Else

Response.Write "An error occurred while uploading the files."

End If

'Set the object to Nothing, clearing memory

Set objUpload = Nothing

Set objFile = Nothing

%>

```

四、上传进度条

上传进度条是AspUpload的高端功能之一。它可以实时监测文件上传的进度，用户可以及时得到上传进度的反馈。上传进度条的实现需要使用AJAX技术。以下是一个简单的上传进度条示例：

```

<%@ Language=VBScript %>

<%

'Declare the required variables

Dim objUpload, objFile, strPath, i, intTotalBytes, intBytesLoaded, strProgress

Dim strScriptBegin, strScriptEnd

'Create the instance of Upload

Set objUpload = Server.CreateObject("Persits.Upload.1")

'Get the total size of all uploaded files

intTotalBytes = objUpload.TotalBytes

'Set script string that will be passed to the client

strScriptBegin = "