urscontrollerservlet.java

学生注册— 本模块允许新的学生创建和维护他们的帐户信息

package web;

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


import day21ex.studentfacade.*;
import day21ex.adminfacade.*;

public class URSControllerServlet extends HttpServlet {
   private StudentFacadeHome studentFacadeHome;
   private AdminFacadeHome   adminFacadeHome;
   public void init(ServletConfig config) throws ServletException {
      System.out.println("URS SERVLET INIT");
      super.init(config);
      try {
         Context ctx = new InitialContext(); 
         studentFacadeHome = (StudentFacadeHome) 
            ctx.lookup("day21ex/StudentFacade");
         adminFacadeHome = (AdminFacadeHome) 
            ctx.lookup("day21ex/AdminFacade");
      }
      catch (Exception e) {
         throw new ServletException(e.toString());
      }
   }
   public void service(HttpServletRequest request,
                       HttpServletResponse response)
      throws ServletException, IOException {
      HttpSession session = request.getSession(true);
      String pageName = request.getParameter("pageName");
      System.out.println("pageName:" + pageName);
      if ( pageName != null ) {
         if ( pageName.equals("loginPage" )) {
            processLoginPage(request, response, session);
         } else if ( pageName.equals("registrationPage" )) {
            processRegistrationPage(request, response, session);
         } else if ( pageName.equals("catalogPage" )) {
            processCatalogPage(request, response, session);
         } else if ( pageName.equals("orderPage" )) {
            processOrderPage(request, response, session);
         }  else if ( pageName.equals("adminPage" )) {
            processAdminPage(request, response, session);
         }  else if ( pageName.equals("enrollmentPage" )) {
            /* day 21 exercise */
            processEnrollmentPage(request, response, session);
         }
      }
   }

   void processLoginPage(HttpServletRequest request,
                         HttpServletResponse response,
                         HttpSession session
      ) 
      throws ServletException, IOException {
      String loginName = request.getParameter("loginName");
      String password = request.getParameter("password");
      System.out.println("LoginName:" + loginName + " Password:" + password);
      StudentFacade studentFacade = null;
      if ( loginName != null ) {    
         try {
            System.out.println("Login name:" + loginName);
            studentFacade = (StudentFacade) studentFacadeHome.create();
            if ( studentFacade.validateUser(loginName, password) == true ) {
               session.putValue("StudentFacade", studentFacade);
               session.setAttribute("courseItemList", 
                                    studentFacade.getCourseItemList());
               forwardToPage(request, response, "/catalog.jsp");

            }
            else {
               studentFacade.remove();
               request.setAttribute("InvalidLogin", "1");
               forwardToPage(request, response, "/login.jsp");
            }
         } catch ( Exception e) {
            System.err.println(e.toString());
            throw new ServletException(e.toString());
         }

      }
      else {
         forwardToPage(request, response, "/login.jsp");
      }
   }

   void processRegistrationPage(HttpServletRequest request,
                         HttpServletResponse response,
                         HttpSession session
      ) 
      throws ServletException, IOException {
      String loginName = request.getParameter("loginName");
      String password = request.getParameter("password");
      String firstName = request.getParameter("firstName");
      String lastName = request.getParameter("lastName");
      String address = request.getParameter("address");
      String emailAddress = request.getParameter("emailAddress");

      System.out.println("LoginName:" + loginName + " Password:" + password);
      System.out.println("firstName:" + firstName + " lastName:" + lastName);
      System.out.println("address:" + address + " emailAddress:" + emailAddress);
      StudentFacade studentFacade = null;
      if ( loginName != null ) {    
         try {
            studentFacade = (StudentFacade) studentFacadeHome.create();
            studentFacade.addStudent(loginName, password, firstName,
                                     lastName, address, emailAddress);
            session.putValue("StudentFacade", studentFacade);
            session.setAttribute("courseItemList", 
                                 studentFacade.getCourseItemList());
            forwardToPage(request, response, "/catalog.jsp");

         } catch ( Exception e) {
            System.err.println(e.toString());
            throw new ServletException(e.toString());
         }

      }
      else {
         forwardToPage(request, response, "/registration.jsp");
      }
   }


   void processCatalogPage(HttpServletRequest request,
                           HttpServletResponse response,
                           HttpSession session
      ) 
      throws ServletException, IOException {
      try {
         StudentFacade studentFacade = 
            (StudentFacade)session.getValue("StudentFacade");
         // correct the following
         String courseId = request.getParameter("buy");
         if ( courseId != null ) {
            String[] courseIds = new String[1];
            courseIds[0] =  courseId;
            studentFacade.addCourses(courseIds);
            session.setAttribute("cartItemList", 
                                 studentFacade.getCartItems());
         }
       
         forwardToPage(request, response, "/catalog.jsp");           
         
      } catch ( Exception e) {
         e.printStackTrace();
         System.err.println(e.toString());
         throw new ServletException(e.toString());
      }

   }

   void processOrderPage(HttpServletRequest request,
                         HttpServletResponse response,
                         HttpSession session
      ) 
      throws ServletException, IOException {
      try {
         StudentFacade studentFacade = 
            (StudentFacade)session.getValue("StudentFacade");
         studentFacade.placeOrder();
         forwardToPage(request, response, "/order.jsp");           
         
      } catch ( Exception e) {
         System.err.println(e.toString());
         throw new ServletException(e.toString());
      }

   }

   void processAdminPage(HttpServletRequest request,
                         HttpServletResponse response,
                         HttpSession session
      ) 
      throws ServletException, IOException {
      try {

         AdminFacade adminFacade = 
            (AdminFacade)session.getValue("AdminFacade");
         if ( adminFacade == null ) {
            adminFacade = (AdminFacade)adminFacadeHome.create();
            session.putValue("AdminFacade", adminFacade);
         }
         String orderId = request.getParameter("orderId");      
         if ( orderId != null ) {
            adminFacade.approveOrder(orderId);
         }

         /* get pending orders */
         session.setAttribute("orderToApproveList", 
                              adminFacade.getOrdersByStatus("Verified"));
         forwardToPage(request, response, "/admin.jsp");           
         
      } catch ( Exception e) {
         System.err.println(e.toString());
         throw new ServletException(e.toString());
      }

   }


   /* day 21 exercise */
   void processEnrollmentPage(HttpServletRequest request,
                         HttpServletResponse response,
                         HttpSession session
      ) 
      throws ServletException, IOException {
      try {
         StudentFacade studentFacade = 
            (StudentFacade)session.getValue("StudentFacade");
         session.setAttribute("enrollmentsList", 
                              studentFacade.getStudentEnrollments());
         forwardToPage(request, response, "/enrollment.jsp");           
         
      } catch ( Exception e) {
         e.printStackTrace();
         System.err.println(e.toString());
         throw new ServletException(e.toString());
      }

   }


   void forwardToPage(HttpServletRequest request,
                      HttpServletResponse response, String page) 
      throws ServletException, IOException {
      RequestDispatcher disp =
         this.getServletContext().getRequestDispatcher(page);
      disp.forward(request, response);

   }
}