Blocks World

import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import jess.*; public class Blocks extends HttpServlet { public void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { response.setContentType( "text/html" ); String root = getInitParameter("root"); // root defined in zone.properties String debug = request.getParameter("debug"); String move = request.getParameter("move"); String on_top_of = request.getParameter("on-top-of"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println("Blocks World"); out.println(""); out.println("

Blocks World

"); out.println("

");

      Rete rete = new Rete();

      rete.addOutputRouter("t", out);
      rete.addOutputRouter("WSTDOUT", out);
      rete.addOutputRouter("WSTDERR", out);

      try {
        BufferedReader br = new BufferedReader(new FileReader(root + "/sylee/courses/jess/examples/blocks.clp"));

        Jesp j = new Jesp(br, rete);
        try
        {
            j.parse(false);
            rete.reset();
            if ("yes".equals(debug)) rete.executeCommand("(watch all)");

            Fact f = new Fact("goal", rete);
            f.setSlotValue("move", new Value(move, RU.ATOM));
            f.setSlotValue("on-top-of", new Value(on_top_of, RU.ATOM));
            rete.assertFact(f);

            rete.run();
        }
        catch (JessException re)
        {
            re.printStackTrace(rete.getErrStream());
        }

    }catch(IOException e){}

    out.println("

"); out.close(); } }