[Jscheme-user] Servlets supporting JScheme Web Programming classes

[Timothy J. H. <tim...@ma...>]

I thought the JScheme Users might be interested in seeing how I teach 
JScheme servlets
in my Intro to Computers classes. I've prepared some example
links you can click on to get a quick feel for how the novice web 
development environment
works.  These are links into the current Summer School class website, 
so if you want
to play around writing some servlets please put them in the following 
folder:

http://tat.cs.brandeis.edu:8090/sum04/cs2a/practice/



QUICK INTRO TO JSCHEME SERVLET ENVIRONMENT

The idea is that the students write Scheme programs ending in .servlet
and the server then evaluates these programs returning the result
to the browser, e.g.

http://tat.cs.brandeis.edu:8090/sum04/cs2a/practice/demo1.servlet

returns the date/time/IP/OS and other info. The students can view the 
file
by adding a "V" to the suffix:

http://tat.cs.brandeis.edu:8090/sum04/cs2a/practice/demo1.servletV

This allows students to look at other students code (just as they can
look at other students HTML using the "View Source" menu item.
When the students need to edit the file, they type a "." at the end of 
the name
and are prompted for the password (in this case it is "jscheme")

http://tat.cs.brandeis.edu:8090/sum04/cs2a/practice/demo1.servlet.

which brings them to a page that allows them to view/edit/save the
servlet code. Changes to the code result in the original code being
stored in a backup directory.

http://tat.cs.brandeis.edu:8090/sum04/backup/sum04/cs2a

You can see the code for validating here

http://tat.cs.brandeis.edu:8090/sum04/lib/schemevalidate.servletV

and the code for editing here

http://tat.cs.brandeis.edu:8090/sum04/lib/umethod/umethod.servletV

This is clearly not a secure system so we run the server on an isolated
network and don't store any sensitive data on it (e.g. no grades, 
credit cards,
etc.) It could be made more secure, but that s a later project


Notes on how to write JScheme servlets are here

http://tat.cs.brandeis.edu:8090/cs2asum04/lectures/L6.html?printable=yes

but are being revised this summer.

The long term goal is to design a variant of Scheme, a curriculum, and 
an
environment so that web programming can become a standard part of the
undergraduate experience.

Comments/suggestions welcome.
---Tim---