Thực hành EJB (Enterprise Java Bean) Lab 6 + 7

Enterprise Application Development in Java EE Lab 06 - 07 Introduction to Messaging Interceptors and Dependency Injection Mục tiêu - Tạo gửi message đến JMS Resource - Client nhận message lưu trữ JMS Resource - Tạo cấu hình Interceptors - Thực thi Interceptors Phần I Bài tập step by step Bài 4.1 Xây dựng JSF Web Application đặt lịch họp thông báo đến tất thành viên lịch họp Step 1: Tạo JSF Web Application tên MeetingMessenger  File  New  Java Web  WebApplication  Name and Location: Project Name  MeetingMessenger  Frameworks: JavaServer Faces Step 2: Tạo JMS Resource  RC MeetingMessenger  New  GlassFish  JMS Resource IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE  Sau hồn thành, JMS Resource tạo thơng tin lưu file glassfish-resources.xml  Glassfish-resources.xml Step 3: Tạo JMS Connection Factory IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE  RC MeetingMessenger  New  GlassFish  JMS Resource IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE  Sau hoàn thành, Một JMS Resource Connection Factory tạo thông tin lưu file glassfish-resource.xml Step 4: Tạo JSF Managed Bean đặt tên JMSProducerBean package bean  RC Source Packages  New  JavaServer Faces  JSF Managed Bean IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE  Viết code JMSProducerBean.java package bean; IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE import javax.annotation.Resource; import javax.faces.application.FacesMessage; import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; import javax.faces.context.FacesContext; import javax.jms.Connection; import javax.jms.ConnectionFactory; import javax.jms.Destination; import javax.jms.JMSException; import javax.jms.MessageProducer; import javax.jms.Queue; import javax.jms.Session; import javax.jms.TextMessage; import javax.naming.InitialContext; import javax.naming.NamingException; /** * * @author Quang */ @ManagedBean @RequestScoped public class JMSProducerBean { //Them meetingMessQueue reference den jms/meetingMessQueue @Resource(mappedName = "jms/meetingMessQueue") private Queue meetingMessQueue; //Khai bao message truyen thong bao private String message; public JMSProducerBean() { } //Getter and setter public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } //phuong thuc send message public void send() throws NamingException, JMSException { InitialContext initContext = new InitialContext(); FacesContext facesContext = FacesContext.getCurrentInstance(); ConnectionFactory factory = (ConnectionFactory) initContext.lookup("jms/meetingMessQueueFactory"); Destination destination = (Destination) initContext.lookup("jms/meetingMessQueue"); initContext.close(); //Tao cac doi tuong JMS Connection connection = factory.createConnection(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); MessageProducer sender = session.createProducer(destination); //Gui message TextMessage msg = session.createTextMessage(message); IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE sender.send(msg); FacesMessage facesMessage = new FacesMessage("Message sent: " + message); facesMessage.setSeverity(FacesMessage.SEVERITY_INFO); facesContext.addMessage(null, facesMessage); } Step 5: Tạo form gửi message index.xhtml Home Step 6: Build and Run Application Step 7: Kiểm tra JMS Resource lưu trữ Server  Services  Servers  GlassFish Server  View Domain Admin Console  Common Tasks  Server (Admin Server) JMS Physical Destinations IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page / 27 Enterprise Application Development in Java EE Step 8: Tạo EJBModule để nhận message từ JMS Resource IT Research Department @BKAP 2015 Page 10 / 27 Enterprise Application Development in Java EE  JMSConsumerBean.java package bean; import java.util.logging.Level; import java.util.logging.Logger; import javax.ejb.ActivationConfigProperty; import javax.ejb.MessageDriven; import javax.jms.JMSException; import javax.jms.Message; import javax.jms.MessageListener; import javax.jms.TextMessage; /** * * @author Quang */ @MessageDriven(activationConfig = { @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"), @ActivationConfigProperty(propertyName = "destinationLookup", propertyValue = "jms/meetingMessQueue") }) public class JMSConsumerBean implements MessageListener { public JMSConsumerBean() { } @Override public void onMessage(Message message) { if (message instanceof TextMessage) { TextMessage msg = (TextMessage) message; try { System.out.println("Received message: " + msg.getText()); } catch (JMSException ex) { Logger.getLogger(JMSConsumerBean.class.getName()).log(Level.SEVERE, null, ex); } } else { System.out.println("Message of wrong type: " + message.getClass().getName()); } } } Step 10: Deploy Application IT Research Department @BKAP 2015 Page 13 / 27 Enterprise Application Development in Java EE Bài 4.2 Xây dựng ứng dụng chat gồm room chat để user join vào room chat tính số lượng user join vào phòng Step 1: Tạo ứng dụng Enterprise với tên ChatApplication  File  New Project  Java EE  Enterprise Application  Name: ChatApplication  Server and Settings  Server: GlassFish Server  Create EJB Module  Create Web Application Module  Sau hoàn thành: Step 2: Tạo lớp java ChatRoomStats package data để quản lý phòng chat, số người phòng chat, thời gian tham gia phòng chat  ChatApplication-ejb  New  Other  Java  Java Class IT Research Department @BKAP 2015 Page 14 / 27 Enterprise Application Development in Java EE  ChatRoomStats.java package data; /** * * @author Quang */ public class ChatRoomStats { //Khai bao ten phong chat la bien chatRoom private String chatRoom; //Khai bao so luong nguowi phong chat la bien personCount private int personCount; //Khai bao so thoi gian tham gia phong chat la bien totalTime private long totalTime; //Tao constructor public ChatRoomStats(String chatRoom) { this.chatRoom = chatRoom; } //Getter va Setter cac bien public String getChatRoom() { return chatRoom; } public void setChatRoom(String chatRoom) { this.chatRoom = chatRoom; } public int getPersonCount() { return personCount; } public void setPersonCount(int personCount) { this.personCount = personCount; } public long getTotalTime() { return totalTime; } public void setTotalTime(long totalTime) { this.totalTime = totalTime; } //Phuong thuc tang so luong nguoi tham gia phong chat co nguoi join vao public void increment() { this.personCount += 1; } //Phuong thuc tinh so thoi gian tham gia public void increaseTotalTime(long time) { this.totalTime += time; IT Research Department @BKAP 2015 Page 15 / 27 Enterprise Application Development in Java EE } } Step 3: Tạo lớp java ApplicationStats package datatrên sở Singleton pattern để khởi tạo đối tượng ChatRoomStats  ChatApplication-ejb  New  Other  Java  Java Class  ApplicationStats.java package data; import java.util.ArrayList; import java.util.List; /** * * @author Quang */ public class ApplicationStats { //Khai bao bien Singleton private static ApplicationStats instance; //Khai bao danh sach ChatRoomStats private static List chatRoomStats = new ArrayList(); //Constructor public ApplicationStats() { } //Phuong thuc khoi tao instance public static ApplicationStats getInstance() { if (instance == null) { instance = new ApplicationStats(); } return instance; } //Phuong thuc tinh so nguoi chat public void inscrementCount(String chatRoom){ for (ChatRoomStats room : chatRoomStats) { if (room.getChatRoom().equals(chatRoom)) { room.increment(); break; } } } //Phuong thuc tinh so nguoi chat thoi gian public void recordTime(String chatRoom, long time){ for (ChatRoomStats room : chatRoomStats) { if (room.getChatRoom().equals(chatRoom)) { room.increaseTotalTime(time); break; IT Research Department @BKAP 2015 Page 16 / 27 Enterprise Application Development in Java EE } } } //Phuong thuc get List Chat Room public List getChatRoomStats(){ return chatRoomStats; } } Step 4: Tạo Session Bean Singleton Sesion Bean tên ChatRoomBean package beanpack  Tạo phương thức joinChatRoom ChatRoomBean.java để tạo random Thread sleep package beanpack; import javax.ejb.Singleton; import javax.ejb.LocalBean; /** * * @author Quang */ @Singleton IT Research Department @BKAP 2015 Page 17 / 27 Enterprise Application Development in Java EE @LocalBean public class ChatRoomBean { public void joinChatRoom(String chatRoom) { try { Thread.sleep((long) (1 + (Math.random() * 1000))); } catch (Exception e) { System.out.println("New person joined the Chat Room " + chatRoom); } } public List getChatRoomStats() { return ApplicationStats.getInstance().getChatRoomStats(); } } Step 5: Tạo lớp Interceptor có tên ChatRoomInterceptor package interceptorpack  ChatRoomInterceptor.java package interceptorpack; import data.ApplicationStats; import data.ChatRoomStats; import java.util.List; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; IT Research Department @BKAP 2015 Page 18 / 27 Enterprise Application Development in Java EE import javax.interceptor.InvocationContext; /** * * @author Quang */ public class ChatRoomInterceptor { //Phuong thuc xu ly truoc khoi tao session bean @PostConstruct public void initialiseChatRoom(InvocationContext context) { System.out.println("PostConstruct - initialising Chat Rooms"); List list = ApplicationStats.getInstance().getChatRoomStats(); //Them cac phong chat vao list list.add(new ChatRoomStats(("Business"))); list.add(new ChatRoomStats("Family")); } //Phuong thuc xu ly truong huy session bean @PreDestroy public void preDestroy(InvocationContext context) { System.out.println("PreDestroy - Clearing Chat Room"); ApplicationStats.getInstance().getChatRoomStats().clear(); } } Step 6: Tạo lớp java có tên HitCounterInterceptor package interceptorpack để đếm số người join vào room chat IT Research Department @BKAP 2015 Page 19 / 27 Enterprise Application Development in Java EE  HitCounterInterceptor.java package interceptorpack; import data.ApplicationStats; import javax.interceptor.AroundInvoke; import javax.interceptor.InvocationContext; /** * * @author Quang */ public class HitCounterInterceptor { //Phuong thuc thuc thi truoc va sau xu ly nghiep vu @AroundInvoke public Object incrementHitCount(InvocationContext context) throws Exception{ System.out.println("HitCounterInterceptor - Start"); //lay Chat Room String chatRoom = (String) context.getParameters()[0]; //Tang so luong nguoi chat room ApplicationStats.getInstance().inscrementCount(chatRoom); Object result = context.proceed(); System.out.println("HitCounterInterceptor - Terminate"); return result; } } Step 7: Tạo lớp TimerInterceptor package interceptorpack IT Research Department @BKAP 2015 Page 20 / 27 Enterprise Application Development in Java EE  TimerInterceptor.java package interceptorpack; import data.ApplicationStats; import javax.interceptor.InvocationContext; /** * * @author Quang */ public class TimerInterceptor { public Object recordPerfTime(InvocationContext context) throws Exception { System.out.println("PerformanceMethodInterceptor - Start"); String chatRoom = (String) context.getParameters()[0]; long startTime = System.currentTimeMillis(); Object result = context.proceed(); long endTime = System.currentTimeMillis(); ApplicationStats.getInstance().recordTime(chatRoom, endTime - startTime); System.out.println("PerformanceMethodInterceptor - Terminate"); return result; } } Step 8: Đưa Interceptor vào Session Bean  ChatRoomBean.java package beanpack; import import import import import import import import import data.ApplicationStats; data.ChatRoomStats; interceptorpack.ChatRoomInterceptor; interceptorpack.HitCounterInterceptor; interceptorpack.TimerInterceptor; java.util.List; javax.ejb.Singleton; javax.ejb.LocalBean; javax.interceptor.Interceptors; /** * * @author Quang */ @Singleton @LocalBean @Interceptors(ChatRoomInterceptor.class) public class ChatRoomBean { @Interceptors({HitCounterInterceptor.class, TimerInterceptor.class}) public void joinChatRoom(String chatRoom) { try { Thread.sleep((long) (1 + (Math.random() * 1000))); } catch (Exception e) { IT Research Department @BKAP 2015 Page 21 / 27 Enterprise Application Development in Java EE System.out.println("New person joined the Chat Room " + chatRoom); } } public List getChatRoomStats() { return ApplicationStats.getInstance().getChatRoomStats(); } } Step 9: Tạo servlet tên ChatServlet package servlet thực thi interceptor  ChatApplication-war  New  Other  Web  Servlet IT Research Department @BKAP 2015 Page 22 / 27 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page 23 / 27 Enterprise Application Development in Java EE  ChatServlet.java package servlet; import beanpack.ChatRoomBean; import data.ChatRoomStats; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.ejb.EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author Quang */ public class ChatServlet extends HttpServlet { //goi Enterprice session bean @EJB private ChatRoomBean chatRoomBean; /** * Processes requests for both HTTP GET and POST * methods * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); //Lay ten phong chat tu request String chatRoom = request.getParameter("ChatRoom"); try (PrintWriter out = response.getWriter()) { //Kiem tra neu trang duoc load hoac join vao room if (chatRoom != null && !chatRoom.isEmpty()) { //Thuc thi phuong thuc interceptor chatRoomBean.joinChatRoom(chatRoom); } /* TODO output your page here You may use following sample code */ out.println(""); out.println(""); out.println(""); out.println("Chat Room"); out.println(""); out.println(""); //Form hien thi cho user out.println(""); out.println("Chat Room: "); out.println("Business"); out.println("Family"); IT Research Department @BKAP 2015 Page 24 / 27 Enterprise Application Development in Java EE out.println(""); out.println(""); out.println(""); out.println("Chat Statistics"); //Lay list ChatRoomStats List stats = chatRoomBean.getChatRoomStats(); for (ChatRoomStats room : stats) { out.println("Chat Room - " + room.getChatRoom()); out.println("

• Number of people - " + room.getPersonCount() + "
"); out.println("
• Total time taken (in mill sec) - " + room.getTotalTime()); out.println("

"); } out.println(""); out.println(""); } } // /** * Handles the HTTP GET method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP POST method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// IT Research Department @BKAP 2015 Page 25 / 27 Enterprise Application Development in Java EE }  Ứng dụng sau hoàn thành Step 10: Build and Run Application IT Research Department @BKAP 2015 Page 26 / 27 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page 27 / 27 ... import java. io.IOException; import java. io.PrintWriter; import java. util.List; import javax .ejb. EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest;... java. util.logging.Level; import java. util.logging.Logger; import javax .ejb. ActivationConfigProperty; import javax .ejb. MessageDriven; import javax.jms.JMSException; import javax.jms.Message; import javax.jms.MessageListener;... ChatRoomBean .java để tạo random Thread sleep package beanpack; import javax .ejb. Singleton; import javax .ejb. LocalBean; /** * * @author Quang */ @Singleton IT Research Department @BKAP 2015 Page 17 / 27