Overview:
The Session Object is how you track a single user across many pages. It has four (4) properties, two (2) collections, one (1) method, and two (2) events.
Get Started:
In this series of examples we will create a password system. We will use the Session Object to track whether or not a user is authorized to view certain pages. Below are several scripts for lesson12. Look at them, play with, and then read the explanations that come further down the page.
<%@LANGUAGE="JavaScript"%> <% //No ASP Here, just a regular HTML Page %> <HTML> To play along with our password page, put in a user name and a password.<BR> <BR>The correct user name is <I>guest</I>.<BR> And the correct password is also <I>guest</I>.<BR> <FORM METHOD="post" ACTION="script12a.asp"> User:<INPUT TYPE="text" SIZE="9" NAME="userName" VALUE="guest"><BR> Pass:<INPUT TYPE="password" SIZE="9" NAME="userPassword" VALUE="guest"> <BR> <INPUT TYPE="submit" value="Login"> </FORM> </HTML>
Click Here to run script12.asp in a new window. Below is script12a.asp.
<%@LANGUAGE="JavaScript"%> <% var userName=new String(Request.Form("userName")) var userPassword=new String(Request.Form("userPassword")) if (userName=="guest" && userPassword=="guest") { Session("Authorized")=true Response.Redirect("script12b.asp") } else { Session("Authorized")=false %> <HTML> You did not supply the correct Name & Password.<BR> <A HREF="script12.asp">Click here</A> to log in. </HTML> <% } //end else statement %>
We'll skip over script12b.asp entirely because it's almost exactly the same as script12c.asp. Down below is script12c.asp.
<%@LANGUAGE="JavaScript"%> <% if (Session("Authorized")!=true) { %> <HTML> You are not an authorized user.<BR> <A HREF="script12.asp">Click here</A> to log in. </HTML> <% } else { %> <HTML> The <B>second</B> of two pages that are password protected.<BR> <A HREF="script12d.asp">Click Here</A> to log out. </HTML> <% } //end of else statement %>
Above is script12c.asp, which is the second of two password-protected pages. Below is script12.asp, which is the logout page.
<%@LANGUAGE="JavaScript"%> <% if (Session("Authorized")!=true) { %> <HTML> You are not an authorized user.<BR> <A HREF="script12.asp">Click here</A> to log in. </HTML> <% } else { var SessionID=Session.SessionID Session.Abandon() %> <HTML> You have sucessfully logged out.<BR> This was session <%=SessionID%>.<BR><BR> Now try a link to one of the pages you've already visited.<BR><BR> <A HREF="script12b.asp">script12b.asp</A><BR> <A HREF="script12c.asp">script12c.asp</A><BR> <A HREF="script12d.asp">script12d.asp</A><BR> </HTML> <% } //end of else statement %>
A Quick Explanation:
After all that, the last thing you want to see is another grey box full of code. Sorry to do it one more time but, the keystone to this system is in script12a.asp. I've reprinted it down below.
if (userName=="guest" && userPassword=="guest") { Session("Authorized")=true Response.Redirect("script12b.asp") }
Any page can now be turned into a password protected page with the following line:
Session Collections:
The two Session Collections are Session.Contents and Session.StaticObjects. They parallel the Application.Contents and Application.StaticObjects.
Using
The shortcut is what you saw in the scripts above.
Session.Contents has two methods of its own. They are
We did not demonstrate StaticObjects in the scripts above. It comes in the form of the <OBJECT> flag (set for Session scope).
No Sharing:
Remember how Application variables could be shared by all viewers on your ASP web site? That's not so with Session Variables. They are private; Session Variables are to be accessed only by one user.
Session.Abandon( ):
My bet is you could figure out Session.Abandon() without any explanation. However, let me just state for the record that Session.Abandon() ends the user's session and releases the Session Variables from memory.
Session Properties:
Let's briefly discuss two properties you are not likely to use. Session.CodePage lets you call for foreign character sets, like Chinese or Russian. Session.LCID is a location identifier. It determines the time zone and language for the server. Don't mess with it.
Now let's move on to something you might actually use from time to time. Session.SessionID is a read-only property generated by the server, and assigned to one specific user during one specific session. The SessionID follows the user from the beginning of the session until the end.
Session.Timeout is the number of minutes that a user can be idle before the Server ends the user's individual session and reclaims the memory that was allocated to Session Variables. (Session.Timeout is demonstrated in the global.asa in lesson 10.)
Session Events:
The two Session events are Session_OnStart() and Session_OnEnd(). These events are accessed in the global.asa. You can see an example of global.asa in lesson 10.
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稳了!魔兽国服回归的3条重磅消息!官宣时间再确认!
昨天有一位朋友在大神群里分享,自己亚服账号被封号之后居然弹出了国服的封号信息对话框。
这里面让他访问的是一个国服的战网网址,com.cn和后面的zh都非常明白地表明这就是国服战网。
而他在复制这个网址并且进行登录之后,确实是网易的网址,也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情,因为以前都没有出现这样的情况,现在突然提示跳转到国服战网的网址,是不是说明了简体中文客户端已经开始进行更新了呢?
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