Source Code for Naming Example

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import java.util.Hashtable;

import javax.servlet.*;

import javax.servlet.http.*;

import javax.naming.NamingException;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingEnumeration;

import javax.naming.directory.InitialDirContext;



/**

 * Demonstration of the web application environment support.

 *

 * @author Remy Maucherat

 */



public class JndiServlet 

    extends HttpServlet {





    public void doGet(HttpServletRequest request, HttpServletResponse response)

        throws ServletException, IOException {

        

        PrintWriter out = response.getWriter();

        response.setContentType("text/plain");

        

        Context ctx = null;

        

        try {

            ctx = new InitialContext();

        } catch (NamingException e) {

            out.println("Couldn't build an initial context : " + e);

            return;

        }

        

        try {

            Object value = ctx.lookup("java:/comp/env/maxExemptions)";

            out.println("Simple lookup test : ");

            out.println("Max exemptions value : " + value);

        } catch (NamingException e) {

            out.println("JNDI lookup failed : " + e);

        }

        

        try {

            Context envCtx = (Context) ctx.lookup("java:/comp/env/");

            out.println("list() on /comp/env Context : ");

            NamingEnumeration enum = ctx.list("java:/comp/env/");

            while (enum.hasMoreElements()) {

                out.print("Binding : ");

                out.println(enum.nextElement().toString());

            }

            out.println("listBindings() on /comp/env Context : ");

            enum = ctx.listBindings("java:/comp/env/");

            while (enum.hasMoreElements()) {

                out.print("Binding : ");

                out.println(enum.nextElement().toString());

            }

        } catch (NamingException e) {

            out.println("JNDI lookup failed : " + e);

        }

        

    }

    

    

}