濡備綍浣跨敤 ASP 文件上载到 Web 服务器

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要求

1. Microsoft Internet 信息与 Microsoft Windows 2000 Server 5.0 (IIS) 安装和配置
2. 如果开发计算机是不同的计算机比服务器，您必须具有有效的网络或 Internet 连接到服务器承载 ASP 页。

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Microsoft Visual Basic 6 项目设置和代码

1. 启动 Visual Basic，然后开始一个新 ActiveX DLL 项目。
2. 项目命名 ASPFileUpload。
3. 更改的 Class1 名称到 文件。
4. 在 项目 菜单上单击 引用。
5. 在 引用 对话框中单击以选择下列选项，然后单击 确定：
   • 对于应用程序的 Visual Basic
   • Visual Basic 运行时对象和过程
   • Visual Basic 对象和过程
   • OLE 自动化
   • COM + 服务类型库
   • Microsoft 活动服务器页面对象库
   • Microsoft 脚本运行时
6. 在 项目 菜单上单击 ASPFileUpload 属性。
7. 在 项目属性 对话框中单击以选择 无人参与执行 和 内存中留存，然后单击 确定。
8. 将以下代码粘贴到 File.cls:

   Option Explicit
   
   Const ERR_INVALID_FILENAME = vbObjectError + 1000
   Const ERR_INVALID_TARGET = vbObjectError + 1001
   Const ERR_FILE_EXISTS = vbObjectError + 1002
   Const ERR_UPLOAD_CALLED = vbObjectError + 1003
   Const VB_ERR_PATH_NOT_FOUND = 76
   
   Private m_objContext As ObjectContext
   Private m_objRequest As ASPTypeLibrary.Request
   
   Private m_strTarget As String
   Private m_strFileName As String
   Private m_blnOverWrite As Boolean
   Private m_blnUploaded As Boolean
   Private m_lngTotalBytes As Long
   
   'All other form elements go here.
   Private m_formCol As Scripting.Dictionary
   
   Implements ObjectControl
   
   Private Function ObjectControl_CanBePooled() As Boolean
     ObjectControl_CanBePooled = False
   End Function
   
   Private Sub ObjectControl_Activate()
     Set m_objContext = GetObjectContext()
     Set m_objRequest = m_objContext("Request")
     Set m_formCol = New Scripting.Dictionary
   End Sub
   
   Private Sub ObjectControl_Deactivate()
     Set m_objContext = Nothing
     Set m_objRequest = Nothing
     Set m_formCol = Nothing
   End Sub
   
   Public Sub Upload()
     
     Const DEFAULT_CHUNK_SIZE = 262144 '256kb
     
     Dim bytBeginOfChunk() As Byte
     Dim bytEndOfChunk() As Byte
     Dim bytBeginOfName() As Byte
     Dim bytEndOfName() As Byte
     Dim bytBeginOfFile() As Byte
     Dim bytEndOfFile() As Byte
     Dim bytBeginOfValue() As Byte
     Dim bytEndOfValue() As Byte
     Dim bytName() As Byte
     Dim bytValue() As Byte
     Dim bytThisChunk() As Byte
     Dim bytFileName() As Byte
     Dim lngBeginOfChunk As Long
     Dim lngEndOfChunk As Long
     
     Dim lngBeginOfAttribute As Long
     Dim lngEndOfAttribute As Long
     Dim lngBeginOfValue As Long
     Dim lngEndOfValue As Long
     Dim blnEndOfData As Boolean
     Dim lngChunkSize As Long
     Dim lngBytesLeft As Long
     Dim lngFileNum As Long
     Dim strFileName As String
     
     On Error GoTo UploadErr
     
     If Uploaded Then
       Err.Raise ERR_UPLOAD_CALLED, App.Title, "The Upload method has already been called."
     End If
        
     bytBeginOfChunk = StrConv("-----------------------------", vbFromUnicode)
     bytEndOfChunk = StrConv("-----------------------------", vbFromUnicode)
     
     bytBeginOfName = StrConv("name=", vbFromUnicode) & ChrB(34)
     bytEndOfName = ChrB(34)
     
     bytBeginOfFile = StrConv("filename=", vbFromUnicode) & ChrB(34)
     bytEndOfFile = ChrB(34)
     
     bytBeginOfValue = ChrB(13) & ChrB(10) & ChrB(13) & ChrB(10)
     bytEndOfValue = ChrB(13) & ChrB(10) & StrConv("-----------------------------", vbFromUnicode)
        
     'Initialize the chunk size.
     If m_objRequest.TotalBytes <= DEFAULT_CHUNK_SIZE Then
       lngChunkSize = m_objRequest.TotalBytes
     Else
       lngChunkSize = DEFAULT_CHUNK_SIZE
     End If
       
     'Get the chunk from the request object.
     bytThisChunk = m_objRequest.BinaryRead(CVar(lngChunkSize))
   
     'Initialize the value.
     lngBeginOfChunk = 1
     
     'Repeat until the end of the data.
     Do While Not blnEndOfData
       'Begin the chunk.
       lngBeginOfChunk = InStrB(lngBeginOfChunk, bytThisChunk, bytBeginOfChunk) + UBound(bytBeginOfChunk)
       
       'Get name of the item.
       lngBeginOfAttribute = InStrB(lngBeginOfChunk, bytThisChunk, bytBeginOfName) + UBound(bytBeginOfName) + 1
       lngEndOfAttribute = InStrB(lngBeginOfAttribute, bytThisChunk, bytEndOfName)
       bytName = MidB(bytThisChunk, lngBeginOfAttribute, lngEndOfAttribute - lngBeginOfAttribute)
       
       'Get the value of the item.
       lngBeginOfValue = InStrB(lngEndOfAttribute, bytThisChunk, bytBeginOfValue, vbBinaryCompare) + UBound(bytBeginOfValue) + 1
       lngEndOfValue = InStrB(lngBeginOfValue, bytThisChunk, bytEndOfValue, vbBinaryCompare)
       
       If lngEndOfValue = 0 Then
         'The item extends the past current chunk.
         bytValue = MidB(bytThisChunk, lngBeginOfValue, lngChunkSize)
       Else
         'The item value exists in the current chunk.
         bytValue = MidB(bytThisChunk, lngBeginOfValue, lngEndOfValue - lngBeginOfValue)
       End If
       
       If UCase(StrConv(bytName, vbUnicode)) = "FILE" Then
         lngBeginOfAttribute = InStrB(lngBeginOfChunk, bytThisChunk, bytBeginOfFile, vbBinaryCompare) + UBound(bytBeginOfFile) + 1
         lngEndOfAttribute = InStrB(lngBeginOfAttribute, bytThisChunk, bytEndOfFile, vbBinaryCompare)
         
         bytFileName = MidB(bytThisChunk, lngBeginOfAttribute, lngEndOfAttribute - lngBeginOfAttribute)
         
         If UBound(bytFileName) < 0 Or UBound(bytValue) < 0 Then
           Err.Raise ERR_INVALID_FILENAME, App.Title, "Invalid File Name."
         End If
         
         If Me.Target = "" Then
           Err.Raise ERR_INVALID_TARGET, App.Title, "Invalid Target."
         End If
         
         'Use the original file name.
         If Me.FileName = "" Then
         
           'Trim the path from the file name.
           While InStrB(1, bytFileName, StrConv("\", vbFromUnicode), vbBinaryCompare) > 0
             bytFileName = MidB(bytFileName, InStrB(1, bytFileName, StrConv("\", vbFromUnicode)) + 1)
           Wend
           
           'Set the property.
           Me.FileName = StrConv(bytFileName, vbUnicode)
           
           'Convert the byte to Unicode.
           strFileName = Me.Target & Me.FileName
          
         Else
           strFileName = Me.Target & Me.FileName
         End If
         
         'Check for overwrite.
         If Me.OverWrite Then
           'This is the hack check. Make sure that wildcard characters cannot be used.
           If Not InStr(1, strFileName, "*") Then
             If FileExists(strFileName) Then
               Kill strFileName
             End If
           Else
             Err.Raise ERR_INVALID_FILENAME, App.Title, "The specified file name appears to be invalid."
           End If
         Else
           If FileExists(strFileName) Then
             Err.Raise ERR_FILE_EXISTS, App.Title, "The file already exists."
           End If
         End If
         
         lngFileNum = FreeFile
         
         Open strFileName For Binary Access Write As #lngFileNum
         
         'Write the file to the destination directory.
         Put #lngFileNum, , bytValue
   
         'This chunk is empty. Therefore, get a new chunk.
         lngBytesLeft = m_objRequest.TotalBytes - lngChunkSize
           
         'Start the chunking machine.
         Do While lngBytesLeft > 0
         
           'Get a new chunk.
           bytThisChunk = m_objRequest.BinaryRead(CVar(lngChunkSize))
                     
             lngEndOfValue = InStrB(1, bytThisChunk, bytEndOfValue, vbBinaryCompare)
             
             If lngEndOfValue > 0 Then
               'The item value exists in the current chunk.
               bytThisChunk = MidB(bytThisChunk, 1, lngEndOfValue - 1)
             End If
             
             'Append the chunk to the file.
             Put #lngFileNum, , bytThisChunk
             
             lngBytesLeft = lngBytesLeft - lngChunkSize
             
             If lngBytesLeft < lngChunkSize Then
               lngChunkSize = lngBytesLeft
             End If
           Loop
           
           Close #lngFileNum
           
           TotalBytes = FileLen(strFileName)
           
        ' Exit Do
        Else
         If UCase(StrConv(bytName, vbUnicode)) = "SAVEAS" Then
          Me.FileName = StrConv(bytValue, vbUnicode)
         Else 
          'form field other than file, such as textboxes 
          If UBound(bytValue) > 0 And UBound(bytName) > 0 Then 
           m_formCol.Add StrConv(bytName, vbUnicode), StrConv(bytValue, vbUnicode)
          Else
           m_formCol.Add StrConv(bytName, vbUnicode), ""
          End If
         End If
        End If
       
       'Get the next chunk.
       lngBeginOfChunk = lngEndOfValue
       
       If InStrB(lngBeginOfChunk, bytThisChunk, bytBeginOfName, vbBinaryCompare) = 0 Then
         blnEndOfData = True
       End If
     Loop
   
     Uploaded = True
     
     Exit Sub
     
   UploadErr:
     
     If Err.Number = VB_ERR_PATH_NOT_FOUND Then
       Err.Raise ERR_INVALID_TARGET, App.Title, "The Target specified does not exist."
     Else
       Err.Raise Err.Number, Err.Source, Err.Description
     End If
   End Sub
   
   Public Property Get Form() As Collection
       Set Form = m_formCol
   End Property
   Public Property Get FileName() As String
     FileName = m_strFileName
   End Property
   
   Public Property Let FileName(ByVal strNewValue As String)
     If Uploaded Then
       Err.Raise ERR_UPLOAD_CALLED, App.Title, "The Upload method has already been called."
     Else
       m_strFileName = strNewValue
     End If
   End Property
   
   Public Property Get OverWrite() As Boolean
     OverWrite = m_blnOverWrite
   End Property
   
   Public Property Let OverWrite(ByVal blnNewValue As Boolean)
     If Uploaded Then
       Err.Raise ERR_UPLOAD_CALLED, App.Title, "The Upload method has already been called."
     Else
       m_blnOverWrite = blnNewValue
     End If
   End Property
   
   Private Property Get Uploaded() As Boolean
     Uploaded = m_blnUploaded
   End Property
   
   Private Property Let Uploaded(ByVal blnNewValue As Boolean)
     m_blnUploaded = blnNewValue
   End Property
   
   Public Property Get Target() As String
     Target = m_strTarget
   End Property
   
   Public Property Let Target(ByVal NewValue As String)
     If Uploaded Then
       Err.Raise ERR_UPLOAD_CALLED, App.Title, "The Upload method has already been called."
     Else
       m_strTarget = NewValue
     End If
   End Property
   
   Private Function FileExists(ByVal FileName As String) As Boolean
     On Error GoTo FileExistsErr
     
     FileLen FileName
     FileExists = True
     Exit Function
     
   FileExistsErr:
     If Err.Number = VB_ERR_PATH_NOT_FOUND Then
       FileExists = False
     End If
   End Function
   
   Public Property Get TotalBytes() As Long
     TotalBytes = m_lngTotalBytes
   End Property
   
   Private Property Let TotalBytes(ByVal NewValue As Long)
     m_lngTotalBytes = NewValue
   End Property
   

9. 编译该项目

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ASP 代码

1. 将以下代码粘贴到编辑器 （如记事本或 Microsoft Visual Interdev，然后将其另存为 PostFile.asp：

   <%@ Language=VBScript %>
   <html>
   <head>
   </head>
   <body>
   <form enctype="multipart/form-data" action="uploadfile.asp" method="post" name="main1">
   <input name="file" type="file" size="50">
   <INPUT type="text" id=text1 name=text1><INPUT type="text" id=text2 name=text2>
   <input name="submit" type="submit" value="Upload">
   </form>
   </body>
   </html>
   

2. 将下面的代码复制到编辑器 （如记事本或可视化 Interdev，然后将它保存为 UploadFile.asp：

   <%@ Language=VBScript %>
   <%
     '//////////////////////////////////////////////////////////////////////////////////
     '//  ASPFileUpload.File API
     '//  
     '//  Properties
     '//     FileName
     '//       - Read/Write 
     '//       - The file will be saved with this file name. 
     '//       - This property can only be set before calling Upload.
     '//       - If no value is specified, the original file name
     '//       - in the HTTP post will be used.
     '//     
     '//     OverWrite
     '//       - Read/Write
     '//       - This property can only be set before calling Upload.
     '//       - If set to false and if the destination file exists, an error
     '//       - is raised. The default value is False.
     '//     
     '//     Target 
     '//       - Read/Write
     '//       - The file will be written to this folder.
     '//       - This property can only be set before calling Upload.
     '//       - There is no default value for this property and it is required.
     '//       
     '//      Form
     '//        - ReadOnly
     '//        - Scripting.Dictionary object
     '//        - Can access a specific item by using aspfileupload.Form("item").
     '//        - Acts like the asp form collection.
     '//        - Can enumerate all values in a collection with for each.
     '//        - Only filled after the Upload method is called.
     '//         
     '//  Methods
     '//     Upload
     '//       - This method parses the HTTP Post and writes the file.
     '//  
     '//  Other
     '//    - ASPFileUpload requires COM+
     '//    - Any call to the Request.Form() collection will cause the Upload
     '//      method to fail as the method references the Binary contents of the
     '//      Request object through the Request.BinaryRead method. 
     '//    - Also, if you access a variable in the Request collection without 
     '//      specifying the subcollection that it belongs to, the Request.Form collection 
     '//      may be searched. This causes an error in the Upload method.
     '//      
     '//////////////////////////////////////////////////////////////////////////////////
     
     Dim strMsg 'As String
     
    ' On Error Resume Next
     dim fuFile
     set fuFile = server.CreateObject("aspFileupload.file")  
     'Set the destination folder.
     fuFile.Target = "C:\TEMP\AspFileUpload\"
     fuFile.Upload
     
     If Err.number = 0 Then
       strMsg = fuFile.FileName  & " was uploaded successfully."
     Else
       strMsg = "An error occurred when uploading your file: " & Err.Description 
     End If
     for each o in fuFile.Form
   	Response.Write o  & "<BR>"
   	
   	next
   	
   	Response.Write fuFile.Form.item("text1") & "  :  " & fuFile.Form.item("text2")
   '  Response.Write Request.Form("test")
    set fufile = nothing
   %>
   <html>
   <head></head>
   <body>
   <%=strMsg%>
   </body>
   </html>

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璁剧疆鏈嶅姟鍣

1. 将接收上载的文件 C:\TEMP\AspFileUpload 如在 Web 服务器上创建一个文件夹。
2. ASPFileUpload.dll 文件复制到 Web 服务器，然后将它注册通过在命令提示符处使用以下命令：
   regsvr32 PathToDLL \ASPFileUpload.dll
3. 文件权限 (写访问权限） 适用于您希望能够上载文件的用户。
4. 单击 开始，指向 设置，然后单击 控制面板。
5. 在控件面板中单击 管理工具，然后单击 组件服务 以打开组件服务 Microsoft 管理控制台 (MMC) 中。
6. 展开 组件服务 节点、 计算机 节点、 我的电脑 节点和 COM + 应用程序 节点。
7. 右击节点，指向 新建，然后单击 应用程序。
8. 在 安装或新建应用程序 对话框中单击 创建空应用程序、 命名应用程序，请确保单击以选择 服务器应用程序，然后单击 下一步。
9. 该 设置应用程序标识 对话框中单击 此用户，然后键入相应的用户帐户的凭据。 用户帐户必须将接收上载的文件的文件夹具有写访问权限。
10. 单击 完成。
11. 展开您刚创建为此应用程序节点。
12. 用鼠标右键单击该 nod、 指向 新建，然后单击 组件。
13. 单击 安装新组件，并找到该文件夹已保存并注册.dll 文件、 单击文件、 单击 下一步，和然后单击 完成。
14. Postfile.asp 的文件和 Uploadfile.asp 文件复制到您的 Web 根文件夹。 榛樿鎯呭喌涓嬶，Web 根文件夹是 C:\Inetpub\Wwwroot。
15. 编辑 Uploadfile.asp 以反映您在步骤 1 中创建该文件夹的目标文件夹。 目标文件夹分配位于下面的代码行：

    fuFile.Target = "C:\TEMP\AspFileUpload\"
    					

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上载文件

1. 在 Web 浏览器中打开 Postfile.asp 页，在以下 URL：
   http:// YourWebServer /Postfile.asp
2. 选择您要上载，一个文件，然后单击 上载。
3. 请检查您的上载文件夹。 您上载的文件将出现在此文件夹中。

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鐤戦毦瑙 g 瓟

• 如果不键入一个文件名，并尝试提交 Postfile.asp 页收到泛型、 服务器端的错误消息。 您可能需要修改代码以提供更友好的错误消息，在客户端或服务器端。
• 如果需要高卷上载容量，Microsoft 建议您购买或生成比此 Visual Basic 组件可以更有效地处理负载的已编译的、 多线程组件。
• 每当您允许用户将文件上载到您的 Web 服务器时，存在潜在的安全风险。 如果您的服务器是在 Internet 上，如果您允许匿名上载时尤其如此。 必须正确配置 Windows 权限和 IIS 用户身份验证，以确保您会向用户提供仅访问他们需要的。 这一点很重要，以便您不允许用户通过绕过安全控制您的系统的访问方式。

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