In Jess 5, making Jess's "standard output" go to a servlet's output is
extremely easy. Say you've got a Rete object in a variable named
'engine', and an HttpServletResponse in a variable named 'res'. Then:
engine.addOutputRouter("t", res.getWriter());
That's it! The Jess 5.0a6 manual, section 4.4.6, explains everything
you need to know about output routers.
At this point Jess 5 is stable enough that I'm recommending everybody
use it rather than 4.4. This would be somewhat harder to accomplish in
Jess 4, anyway.
I think Message UK wrote:
>
> Thanks Danny, that is helpful. I have no GUI yet, I'm just starting with my
> servlet stuff and I have servlets like Hello World running just fine on my
> PC using the built in web server with JDSK and I got the O'Reilly servlets
> book...
>
> I guess what I need to know how to do is take the javacsript or output
> strings from the RHS of my rules in jess, and have the servlet interpret
> them. There must be a simple way to do it! Main produces output to standard
> output, so how do I "capture" the output, or better still, change the output
> stream from standard to "internal" (if you know what I mean!!!)?? I'll work
> out the http get and post stuff, I have the text for that. I just have very
> littl eexperience with output stream stuff.
>
> Thanks so much for your help. ANy comments welcome!!!
>
> >
> >Hi,
> >A lot will depend on how the servlet is to be used - servlets are based
> >around HTTP
> >comms, so if you're wanting e.g. user interaction you will have fun sorting
> >out
> >what messages to send from form post operations etc. It is remarkably
> >straightforward to stick an application that doesn't have a lot of GUI
> >stuff - you
> >pretty much just take the code from within your main class and bung it in a
> >servlet
> >class e.g.
> >public class WasMyMain extends HttpServlet{
> >I haven't really looked at it, but I guess that you would be able to do
> >redirection
> >from the Jess UI to HTTP, but this could get a bit fiddly - I'd be tempted
> >to strip
> >down the front end a bit first and then build a HTTP-based GUI from scratch
> >(no as
> >bad as it sounds - doesn't need much more than HTML).
> >I don't know if you've already done this, but it can take a while to get
> >the
> >servlet runner (Jserv or whatever) going right on your web server - what
> >I'm trying
> >to say is, get HelloWorldServlet working first before attacking the Jess
> >code.
> >The Java Tutorial is pretty good on servlets :
> >http://java.sun.com/docs/books/tutorial/servlets/index.html
> >and there's the mailing list :
> >[EMAIL PROTECTED]
> >I'd love to hear how you get on.
> >Cheers,
> >Danny.
> >
> >
> >Message UK wrote:
> >
> > > Hello. I'm hoping to write a servlet which will run JESS, and I'd like
> >to
> > > know if I can do so **simply**, by taking the output of jess.Main and
> >have
> > > the servlet use this output. I read that the output stream can be
> >altered,
> > > so rather than standard output I'd send it to the servlet. Any help? I
> >have
> > > seen an example of a servlet by RF Grove but that's a bit too complex
> >for my
> > > needs!
> > >
> > > Many thanks. Debbie Lampon
> > >
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
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