readfile_in_asp

在 ASP 中读取文本文件。

如何在 ASP 中使用 VBScript 读取服务器上的文本文件

任何编程语言中最重要的任务之一就是读取和写入文件的能力。 ASP 涉及的步骤与许多其他语言没有什么不同：

1. 指定文件的位置
2. 判断文件是否存在
3. 获取文件的句柄
4. 阅读内容
5. 关闭文件并释放所有使用的资源

ASP 中的文件 I/O 可以使用FileSystemObject组件来完成。打开文本文件时，您只需将其作为文本流打开，并且您可以使用此文本流来访问文件的内容。

FileSystemObject 允许您执行所有文件和文件夹处理操作。它可以返回一个可以作为文本流打开的文件，也可以直接返回一个文本流对象。

下面我介绍两种不同的方法。第一个方法获取文件对象并使用它打开文本流，第二个方法直接从FileSystemObject打开文本流。

方法一：

File: " & Filename & " (size " & FileSize &_ " bytes)

---

" Response.Write "

"

    ' Open the file
    Dim TextStream
    Set TextStream = file.OpenAsTextStream(ForReading, TristateUseDefault)

    ' Read the file line by line
    Do While Not TextStream.AtEndOfStream
        Dim Line
        Line = TextStream.readline
    
        ' Do something with "Line"
        Line = Line & vbCRLF
    
        Response.write Line 
    Loop

    Response.Write "

---

" Set TextStream = nothing Else Response.Write "

File " & Filename &_ " does not exist

" End If Set FSO = nothing %>">

 <% Option Explicit

Const Filename = " /readme.txt "    ' file to read
Const ForReading = 1 , ForWriting = 2 , ForAppending = 3
Const TristateUseDefault = - 2 , TristateTrue = - 1 , TristateFalse = 0

' Create a filesystem object
Dim FSO
set FSO = server . createObject ( " Scripting.FileSystemObject " )

' Map the logical path to the physical system path
Dim Filepath
Filepath = Server . MapPath (Filename)

if FSO.FileExists(Filepath) Then

    ' Get a handle to the file
    Dim file    
    set file = FSO.GetFile(Filepath)

    ' Get some info about the file
    Dim FileSize
    FileSize = file.Size

    Response . Write " 
File: " & Filename & " (size " & FileSize  & _
                   " bytes)
 "
    Response . Write " 
 "

    ' Open the file
    Dim TextStream
    Set TextStream = file.OpenAsTextStream(ForReading, TristateUseDefault)

    ' Read the file line by line
    Do While Not TextStream.AtEndOfStream
        Dim Line
        Line = TextStream.readline
    
        ' Do something with "Line"
        Line = Line & vbCRLF
    
        Response . write Line 
    Loop

    Response . Write " 
 "

    Set TextStream = nothing
    
Else

    Response . Write " 
 File " & Filename & _
                       " does not exist
 "

End If

Set FSO = nothing
%>

方法二：

" & Contents & "

---

" TextStream.Close Set TextStream = nothing Else Response.Write "

File " & Filename &_ " does not exist

" End If Set FSO = nothing %>">

 <% Option Explicit

Const Filename = " /readme.txt "    ' file to read
Const ForReading = 1 , ForWriting = 2 , ForAppending = 3
Const TristateUseDefault = - 2 , TristateTrue = - 1 , TristateFalse = 0

' Create a filesystem object
Dim FSO
set FSO = server . createObject ( " Scripting.FileSystemObject " )

' Map the logical path to the physical system path
Dim Filepath
Filepath = Server . MapPath (Filename)

if FSO.FileExists(Filepath) Then

    Set TextStream = FSO.OpenTextFile(Filepath, ForReading, False , TristateUseDefault)

    ' Read file in one hit
    Dim Contents
    Contents = TextStream.ReadAll
    Response . write " 
 " & Contents & " 
 "
    TextStream.Close
    Set TextStream = nothing
    
Else

    Response . Write " 
 File " & Filename & _
                   " does not exist
 "

End If

Set FSO = nothing
%>