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/ch2/servletController/Controller.java package ch2.servletController; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet( urlPatterns={"/ch2/servletController/Controller"}) public class Controller extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //The address of the JSP will be stored as a string. String address; //Set the value of the address to the URL of the page //that is associated with the button that was pressed. //This 'if' statement is translating a button name to //a URL. //As the author of the controller, you have knowledge //of all the pages that it controls. You must test for //the button that was clicked by testing if its name in //in the query string using the 'getParameter' method. //Only the button that was clicked will have its name //in the query string. if (request.getParameter("processButton") != null) { address = "Process.jsp"; } else if (request.getParameter("confirmButton") != null) { address = "Confirm.jsp"; } else { address = "Edit.jsp"; } //Create a request dispatcher for the address //and forward the request and response objects to it. RequestDispatcher dispatcher = request.getRequestDispatcher(address); dispatcher.forward(request, response); } }

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