Transcript ASP

A S P
Presented by: Yu, zhu
Time :2003.10.20
Outline
The introduction of ASP
 Why we choose ASP
 How ASP works
 Basic syntax rule of ASP
 ASP’S object model
 An example of ASP (management system of chat
room)
 Limitations of ASP
 Summary

Introduction
What is the ASP
ASP (Active Server Pages) is a technology
developed by Microsoft. Pages using ASP are
primarily developed in JavaScript, VBScript , or
PerlScript and are integrated into the HTML of
your Web pages. The ASP code is compiled by the
server and the resulting output is standard HTML.
By using ASP, Web pages can be dynamic, full of
ever-changing content, and browser independent
Introduction (Cont.)
Here's the official word from the Microsoft site:
"Active Server Pages is an open, compile-free
application environment in which you can combine
HTML, scripts, and ActiveX server components to
create dynamic and powerful Web-based business
solutions. Active Server Pages enables serverside scripting for IIS with native support for both
VBScript and Jscript." and the highest version of
IIS is IIS 5.0
Why we choose ASP



What can we do by using ASP
Server-side ASP scripts can be used to store HTML form
information in a database, personalize Web sites according
to visitor preferences, or use different HTML features
based on the browser.
separate the design of your Web page from the details of
programming access to databases and applications ,
allowing programmers and Web designers to focus on
what they do best.
Can call other programs to do things like access databases,
serve different pages to different browsers
Why we choose ASP (Cont.)
The benefits of ASP




ASP runs as a service of the Web server, and is optimized
for multiple threads and multiple users.
you can create ASP pages using whatever language you
want.
ASPs can also take advantage of COM and DCOM objects
with minimum effort.
Server-side scripts cannot be readily copied because only
the result of the script is returned to the browser; users
cannot view the script commands that created the page
they are viewing.
How ASP works
How ASP works (Cont.)
Have a look at the diagrams below. They are pretty simplistic and self-explanatory.
The Basic syntax rule of ASP
ASP contain the server scripts, which can contain
any expressions, statements, procedures,
operators valid for the scripting language. These
server scripts are enclosed by the delimiters <%
and %>
 1. VBScript
 2. JavaScript
 3. Other Scripting Languages
ASP’S object model
 1.
Request Object
 2. Response Object
 3. Server Object
 4. Session Object
 5. Application Objects
An example of ASP
 A management
system of a small chat room
In this management system of the chat room,
files are used to record the data. This
management system is used to kick out
some users.
An example of ASP
An example of ASP (source code)
<%Response.Expires=0
manage=Session("hqtchatmanage")
if manage<>"Administrator" then Response.Write “visit declined" : Response.end
username=Request.QueryString("username")
dim online()
onfile=server.mappath("online.asp") get the path of the online.asp
Set fs=CreateObject("Scripting.FileSystemObject")
establish the “Filesystemobject” objection，and set the fs as the variable
Set thisfile = fs.OpenTextFile(onfile,1,False)
counton = 0
do while not thisfile.AtEndOfStream
thisline = thisfile.readline
Get a line of data from the file
Redim preserve online(counton) define an array
online(counton) = thisline
counton = counton + 1
loop
An example of ASP (source code)
thisfile.Close
Set outfile = fs.CreateTextFile(onfile)
for i=0 to counton-1 step 3
if online(i)<>username then
If the user are not deleted
outfile.WriteLine online(i)
output all of the data of this user, and rewrite the
outfile.WriteLine online(i+1) data to the online.asp. And replace the original
outfile.WriteLine online(i+2) data of online.asp. So you can just see the users
end if
except the name of this user who was kicked out!
next
outfile.Close
Close this file
set fs=nothing
Response.Redirect "onlinelist.asp"
%>
An example of ASP (Cont.)
An example of ASP (Cont.)
 This
function is achieved all by files instead
of the database. At first, establish a
temporary file folder (outfile). Output the
data of the users’ information such as
username, IP address and so on and store
in this folder. Then write into the file
(online.asp) that recorded the users’
information orderly and replace the original
data in this file.
Limitations of ASP




Many of the functions of ASP will perform often in a data
driven website take several lines of repetitive code each
time to perform.
Sometimes, the code of ASP will become repetitive and is
somewhat time consuming.
ASP is the lack of a good development environment. ASP
is extremely robust, working well with the Windows
platform on many levels, but is often convoluted and
finding good support documentation and code examples
can be excruciating.
And if you are not proficient in Visual Basic or programming,
ASP is a very difficult language to learn.
Summary

ASP was designed as a faster and easier
alternative to CGI scripting using Perl or C. It
provides an easy-to-learn scripting interface
(including native support for VBScript and JScript),
along with a number of predefined objects that
simplify many development tasks, such as
maintaining user state and defining global
variables within an application. ADO components
can be used to perform additional functions,
including accessing ODBC-compliant databases,
and outputting data to text files. Java components
and XML can be used to extend ASP scripts
Reference









http://www.asp101.com/
http://www.aspin.com/
http://www.powerasp.com/
http://hotwired.lycos.com/webmonkey/98/39/index2a.html
http://www.asp-help.com/
http://www.webopedia.com/TERM/A/Active_Server_Pages.
html
http://www.aspronline.com/
http://www.oreilly.com/catalog/designasp/
http://www.codefixer.com/tutorials/how_asp_works.asp
Thank You for your time!