// A second servlet program that jess embedded in Java // Usage : web/servlets/Jess?source= // root directory "c:/apache/htdocs" as specified in zone.properties import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import jess.*; public class JessTest2 extends HttpServlet { String root; public void init(ServletConfig Conf) throws ServletException { super.init(Conf); //Get the directory in which jess files are stored root = getInitParameter("root"); // specified in zone.properties if using JServ, } public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { //Establish the type of output res.setContentType("text/html; charset=Big5"); //Get an output stream PrintWriter out = res.getWriter(); //Get the file name through the query string String fileRB = req.getParameter("source"); //Construct an HTML form and send it back to the client out.println(""); out.println("jess engine result"); out.println(""); out.println("

The Jess Engine result

");

    try {
        // Open the rule base file
        BufferedReader br = new BufferedReader(new FileReader(root + fileRB));

        // Create a Jess engine
        Rete rete = new Rete();

        // connect Jess output to Writer out which will be sent to browser
        rete.addOutputRouter("t", out);
        rete.addOutputRouter("WSTDOUT", out);
        rete.addOutputRouter("WSTDERR", out);

        // Create a parser for the file, telling it where to take input
        // from and which engine to send the results to

        Jesp j = new Jesp(br, rete);
        try
        { // parse and execute one construct, without printing a prompt
            j.parse(false);
            rete.reset();
            rete.run();
        }
        catch (JessException re)
        {
            // All Jess errors are reported as 'JessException's.
            re.printStackTrace(rete.getErrStream());
        }

    }catch(IOException e){}

    out.println("
"); out.close(); } // end doGet() } // end servlet