当前位置: 首页 > 图文教程 > 网络编程 > ASP > 用多种方法制作WEB页面的计数器

ASP
ASP实例代码：搞个长文章分页代码
说说对象的复制
多个函数验证同一表单
查询某个字段没有值的所有记录的SQL语句怎么写？
ASP实例：一个简单的ASP无组件上传类
ASP实例讲解：用分页符实现长文章分页显示
ASP实例：动态网页中常用的6个ASP程序
ASP实例：词语搭配游戏的制作
ASP实例学习：随机生成文件名的函数
asp实例：测试WEB服务器
ASP实例：计数器程序详解
预防ASP网站被黑 彻底了解ASP木马
分享：XML HTTP Request的属性和方法简介
ASP架设：给每个IIS站点建立一个用户
ASP技巧：判断远程图片是否存在
故障解决：解决ASP脚本运行超时的方法
再说ASP输出N行N列表格
怎么判断一个对象是否已被释放
ASP实现网页打开任何类型文件都保存的方法
ASP技巧：利用函数InstrRev()获取当前文件名

No. « 6 7 8 9 »

技术文章搜索

关键字

ASP 中的 用多种方法制作WEB页面的计数器

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-11-03   浏览: 27 ::
收藏到网摘: n/a

  One way to do it:

Do you like to know how many users visited your site? Creating a Web counter is very easy thing to do
using ASP. The only thing you have to do is to use an application server variable called count, this
variable will have the value zero when your application is started for the first time, and every time anew
visitor will come to your site the count variable will be incremented, the increment section will be
written in the Session_OnStart in the Global.asa through three steps:
¨  Lock the application server so no more than one visitor will try to increase it at the same time.
¨  Increment the count variable by one.
¨  Unlock the variable.
And that’s all what you have to do to create a simple counter and here is the code.
First let us do the Global.asa section:

<SCRIPT LANGUAGE=VBScript RUNAT=Server>
Sub Session_OnStart
   ' Lock the Application object
   Application.Lock

     ' Increment the count
      Application("count") = Application("count") + 1

   ' Unlock the Application object
   Application.Unlock
End Sub
</SCRIPT>


And now to show the result you just need to retrieve the count variable like this in your web page:
<%@ language="vbscript"%>
<HTML>
<HEAD>
<TITLE>Counter Example 1</TITLE>
</HEAD>
<BODY>
<H1> You are the visitor number <%=Application("count")%></H1>
</BODY>
</HTML>



Another way to do it:

Ok that’s very nice, but what will happen if the application stops for any reason? You will lose all the
data stored in the application variables and that includes the count variable. To solve this problem I
will use another way, you need to store the value of the count variable with in a text file or database.
For me I prefer database so I will use an MS access database with a table of one field called count and
the field called counter of type NUMBER.

<%
' Declare the variables that will be used with our code
Dim Connection, RS, ConStr, Counts

' Create and open the database connection
Set Connection=Server.Createobjec t("ADODB.Connection")
ConStr=("DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath ("counter.mdb"))
Connection.Open ConStr

' Create the record set and retrive the counter value
Set RS = Connection.Execute("SELECT * FROM count")

' Increase the counter value by one
Counts=RS("counter")+1

' Update the counter value in the database
Set RS = Connection.Execute ("UPDATE count SET counter =" & Counts)
Connection.Close
%>

<HTML>
<HEAD>
<TITLE>Counter Example 2</TITLE>
</HEAD>
<BODY>
<H1>You are the visitor number <%=Counts%></H1>
</BODY>
</HTML>



What about Active users:

Some guys wants to know how many visitors are currently seeing the site, for that we will use another way,
we will create an application variable called active, and on each new session we will increase it by one
and when a session ends we will decrease it by one, and here is the code:

The Global.asa:
<SCRIPT LANGUAGE="VBScript" RUNAT="Server">

Sub Application_OnStart
         'Create the variable that will hold the number of active visitors
    Application("Active") = 0
End Sub

Sub Session_OnStart
   'Increase the counter by one
   Application.Lock
      Application("Active") = Application("Active") + 1