MVC.rar_mvc

package mvcexample.controller; import javax.servlet.*; import javax.servlet.http.*; import java.io.IOException; import mvcexample.model.*; /** * A simple implementation of a servlet-based controller, using the * MailingBean model from the model package. */ public class ListController extends HttpServlet { // parameters shared with the JSP. Note these values must be the same // as the property names in the JSP files. public static final String FIRST_PARAM = "first"; public static final String LAST_PARAM = "last"; public static final String EMAIL_PARAM = "email"; public static final String MAILINGBEAN_ATTR = "mailingbean"; /** * Respond to an HTTP GET request. */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // read the paremeters from the request String first = request.getParameter(FIRST_PARAM); String last = request.getParameter(LAST_PARAM); String email = request.getParameter(EMAIL_PARAM); // get the mailing list bean for this list MailingBean mb = MailingBeanFactory.newInstance(); // set the parameters into the bean mb.setFirst(first); mb.setLast(last); mb.setEmail(email); // store a copy of the bean in the request context request.setAttribute(MAILINGBEAN_ATTR, mb); // perform the business method boolean result = mb.doSubscribe(); // choose a page based on the result String nextPage = "/success.jsp"; if (!result) nextPage = "/failure.jsp"; // transfer control to the selected view RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(nextPage); dispatcher.forward(request, response); } }