Java EE 6 example source code file (TestServlet.java)

This example Java EE 6 source code file (TestServlet.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Java EE 6 tags/keywords

filter, filter, hello, http, httpservlet, httpservletresponse, io, ioexception, missing, missing, override, request, response, servlet, servletexception, servletexception, servletrequestlistener, testservlet, testservlet

The Java EE 6 TestServlet.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2009 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package web.servlet.dynamicregistration_war;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/**
 * Servlet that is registered by the
 * <tt>web.servlet.dynamicregistration_war.TestServletContextListener.
 *
 * <p>This Servlet verifies that the initialization parameter that was
 * added by the <tt>TestServletContextListener when it registered the
 * Servlet is present in its <tt>ServetConfig.
 *
 * <p>The Servlet also verifies that the Filter mapped to it has been
 * invoked, by checking the request for the presence of the Filter's
 * initialization parameter that was added by the
 * <tt>TestServletContextListener when it registered the Filter,
 * and was set on the request (as a request attribute) by the Filter as
 * the request passed through the Filter.
 * 
 * <p>If any of the verification steps fail, the Servlet will throw an
 * Exception. Otherwise, it outputs the string <tt>HELLO WORLD! to the
 * response.
 *
 * @author Jan Luehe
 */
public class TestServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse res)
            throws IOException, ServletException {

        if (!"servletInitValue".equals(getServletConfig().getInitParameter(
                        "servletInitName"))) {
            throw new ServletException("Missing servlet init param");
        }

        if (!"filterInitValue".equals(req.getAttribute("filterInitName"))) {
            throw new ServletException("Missing request attribute that was " +
                "supposed to have been set by programmtically registered " +
                "Filter");
        }

        if (!"listenerAttributeValue".equals(req.getAttribute(
                "listenerAttributeName"))) {
            throw new ServletException("Missing request attribute that was " +
                "supposed to have been set by programmtically registered " +
                "ServletRequestListener");
        }

        res.getWriter().println("HELLO WORLD!\n");
    }
}