如何对文件进行操作？

<%@ LANGUAGE="VBScript" %>

<% 'Set file i/o constants.
  Const ForReading  = 1
  Const ForWriting  = 2
  Const ForAppending = 8
  filename = "test.txt"
  path = Server.MapPath("data") & "\" & filename

  ' 映射文件名到服务器的物理路径.
  operation = Request.Form("operation") %>

  ' 得到请求操作.

" method="post"> 创建 删除 读取 写入 添加 确定"> 重置"> 返回

<%
  if operation = "create" then
    call CreateFile(path)
    call ReadFile(path)
  elseif operation = "delete" then
    call DeleteFile(path)
  elseif operation = "read" then
    call ReadFile(path)
  elseif operation = "write" then
    call WriteFile(path)
    call ReadFile(path)
  elseif operation = "append" then
    call AppendFile(path)
    call ReadFile(path)
  end if

' 执行请求操作.
%>

<% sub CreateFile(path)
    dim fs, file
    set fs = CreateObject("Scripting.FileSystemObject")
    if fs.FileExists(path) then
      Response.Write(噢,文件" & filename & " 已经存在,创建失败!
" & vbCrLf)

     ' 如果文件早已存在则显示一个错误信息
    else
      Response.Write(恭喜, " & filename & "创建成功!
" & vbCrLf)

' 否则创建它并写入数据
      set file = fs.CreateTextFile(path)
      Response.Write(向" & filename & "写入数据...
" & vbCrLf)
      file.WriteLine("Line 1 added " & Now() & ".")
      file.WriteLine("Line 2 added " & Now() & ".")
      file.WriteLine("Line 3 added " & Now() & ".")
      file.WriteLine("Line 4 added " & Now() & ".")
      file.WriteLine("Line 5 added " & Now() & ".")
      file.Close()
    end if
  end sub
  sub DeleteFile(path)
    dim fs, file
    set fs = CreateObject("Scripting.FileSystemObject")
    if not fs.FileExists(path) then

' 如果文件不存在则显示一个错误信息.
      Response.Write(噢,文件" & filename & "不存在,您删除什么!
" & vbCrLf)
    else
      Response.Write(恭喜," & filename & "删除成功!
" & vbCrLf)

  ' 否则删除它.
      fs.DeleteFile(path)
    end if
  end sub
  sub ReadFile(path)
    dim fs, file
    set fs = CreateObject("Scripting.FileSystemObject")
    if not fs.FileExists(path) then
      Response.Write(噢,文件" & filename & "不存在,您读取什么!
" & vbCrLf)
    ' 如果文件不存在则显示一个错误信息.

    else
      set file = fs.OpenTextFile(path, ForReading)
      Response.Write(恭喜," & filename & "读取成功!" & vbCrLf)

  ' 否则打开它并显示内容.
      Response.Write("

" & vbCrLf)
      Response.Write("

---

" & vbCrLf)
      Response.Write("

" & vbCrLf)
      do while not file.AtEndOfStream
        Response.Write(file.ReadLine & vbCrLf)
      loop
      Response.Write("

" & vbCrLf)
      Response.Write("

---

" & vbCrLf)
      file.Close()
    end if
  end sub
  sub WriteFile(path)
    dim fs, file
    set fs = CreateObject("Scripting.FileSystemObject")
    if not fs.FileExists(path) then
      Response.Write(噢,文件" & filename & "不存在,您写入什么!
" & vbCrLf)

   ' 如果文件不存在则显示一个错误信息.

    else
      set file = fs.OpenTextFile(path, ForWriting)

   ' 否则,改写内容.
      Response.Write(Rewriting file " & filename & ".
" & vbCrLf)
      file.WriteLine("Rewritting file with line 1 added " & Now() & ".")
      file.WriteLine("Rewritting file with line 2 added " & Now() & ".")
      file.WriteLine("Rewritting file with line 3 added " & Now() & ".")
      file.Close()
    end if

  end sub

  sub AppendFile(path)

    dim fs, file

    set fs = CreateObject("Scripting.FileSystemObject")

    if fs.FileExists(path) then
      set file = fs.GetFile(path)
      if file.size > 500 then

 ' 如果文件存在,检查它的大小并退出,如果它超过500K.
        Response.Write(噢,文件" & filename & "超过了大小限制, 添加失败!
" &
vbCrLf)
        exit sub
      end if

    else
      Response.Write(噢,文件" & filename & "不存在!但它将会被创建...
" & vbCrLf)
    end if
    ' 如果文件不存在,显示一个提示信息.

    Response.Write(添加内容到文件" & filename & "...
" & vbCrLf)
    set file = fs.OpenTextFile(path, ForAppending, true)
    file.WriteLine("添加的新内容:" & Now() & ".")

' 当需要给它添加新内容时打开或创建文件
    file.Close()

  end sub %>

 

    

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