Thực hành EJB (Enterprise Java Bean) Lab 1 + 2

Enterprise Application Development in Java EE Lab 01 + 02 Introduction to Business Components Enterprise Java Bean Mục tiêu - Tạo project EJB - Tạo Session Bean Stateless theo interface Local, Remote - Deploy project - Gọi phương thức từ Session Bean Phần I Bài tập step by step Bài Tạo project EJB với Session Bean Stateless có interface Local gồm phương thức sau: - countWord(String st): Trả số từ chuỗi (Mỗi từ cách khoảng trắng) - convertToNoun(String name): Trả chuỗi chuẩn dạng danh từ (Các từ cách khoảng trắng, ký tự đầu từ ký tự hoa, chứa ký tự AZ az) Step 1: Tạo ứng dụng EJB  File  New  JavaEE Enterprise Application IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE  Cấu trúc Project sau hoàn thành IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE Step 2: Tạo Stateless Session Bean cho ứng dụng  Session01_02-ejb  New  Other  Enterprise JavaBeans  SessionBean IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE  Cấu trúc ứng dụng sau hoàn thành Step 3: Khai báo phương thức nghiệp vụ Session Bean Local S01_02SessionBeanLocal.java package sessionBean; import javax.ejb.Local; /** * * @author admin */ @Local public interface S01_02SessionBeanLocal { int countWord(String st); String convertToNoun(String name); } Step 4: Thực thi phương thức nghiệp vụ Session Bean IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE S01_02SessionBean.java package sessionBean; import javax.ejb.Stateless; /** * * @author admin */ @Stateless public class S01_02SessionBean implements S01_02SessionBeanLocal { @Override public int countWord(String st) { st = st.trim(); String[] tokens = st.split(" "); return tokens.length; } @Override public String convertToNoun(String name) { name = name.trim(); name = name.replaceAll("\\s+", " "); name = name.replaceAll("[^a-zA-Z ]+", ""); name = name.toLowerCase(); String[] tokens = name.split(" "); name = ""; for (int i = 0; i < tokens.length; i++) { name += String.valueOf(tokens[i].charAt(0)).toUpperCase() + tokens[i].substring(1); if (i < tokens.length - 1) { name += " "; } } return name; } } Step 5: Xây dựng Client gọi Local Bean để test phương thức nghiệp vụ xây dựng  Tạo trang jsp để nhập liệu test phương thức nghiệp vụ xây dựng  Session01_02.war  Web Page  New  Other  Web  JSP IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE  Tạo form nhập danh từ cần đếm số từ hay cần chuẩn hóa standardized.jsp gọi đến servlet kết nối với local bean Standardized Page Standardized Noun Input Noun:  Tạo Servlet Session01_02.war để gọi Local Bean  Session01_02.war  New  Other  Web  Servlet IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page / 25 Enterprise Application Development in Java EE  S01_02Servlet.java  Call Enterprise Bean (Alt + Insert)  S01_02Servlet.java package servlet; import java.io.IOException; import java.io.PrintWriter; import javax.ejb.EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; IT Research Department @BKAP 2015 Page 10 / 25 Enterprise Application Development in Java EE import javax.servlet.http.HttpServletResponse; import sessionBean.S01_02SessionBeanLocal; /** * * @author admin */ public class S01_02Servlet extends HttpServlet { @EJB private S01_02SessionBeanLocal s01_02SessionBean; /** * 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"); try (PrintWriter out = response.getWriter()) { /* TODO output your page here You may use following sample code */ out.println(""); out.println(""); out.println(""); out.println("Standardized Noun"); out.println(""); out.println(""); String noun = request.getParameter("noun"); if (request.getParameter("countWord")!=null) { int count = s01_02SessionBean.countWord(noun); out.println("Number of Word: "+count+""); } else { String covertnoun = s01_02SessionBean.convertToNoun(noun); out.println("Convert To Noun: "+covertnoun+""); } 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) IT Research Department @BKAP 2015 Page 11 / 25 Enterprise Application Development in Java EE 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"; } }  Ứng dụng sau hoàn thành IT Research Department @BKAP 2015 Page 12 / 25 Enterprise Application Development in Java EE Step 6: Khai báo web.xml  web.xml  Pages IT Research Department @BKAP 2015 Page 13 / 25 Enterprise Application Development in Java EE Step 7: Build, Deploy and Run Application  Build and Deploy  Sau Deploy IT Research Department @BKAP 2015 Page 14 / 25 Enterprise Application Development in Java EE  Run and Test Application IT Research Department @BKAP 2015 Page 15 / 25 Enterprise Application Development in Java EE Bài Tạo ứng dụng EJB với Session Bean Stateless có interface Remote thực phương thức autolncrement(String valuecurrent, int fixedletter): phương thức trả giá trị tăng valuecurrent, fixedletter số ký tự cố định đầu VD: autolncrement(“HD00029”,2)  kết trả “HD00030” Step 1: Tạo Interface cho Stateless Session Bean  File  New Project  Java  Java Class Library IT Research Department @BKAP 2015 Page 16 / 25 Enterprise Application Development in Java EE Step 2: Sử dụng application 1, Tạo Stateless Session Bean với interface Remote  Session01_02-ejb  New  Other  Enterprise JavaBeans  Session Bean IT Research Department @BKAP 2015 Page 17 / 25 Enterprise Application Development in Java EE  Cấu trúc ứng dụng sau hoàn thành IT Research Department @BKAP 2015 Page 18 / 25 Enterprise Application Development in Java EE Step 3: Khai báo phương thức nghiệp vụ Interface RemoteSessionBeanRemote.java Step 4: Triển khai phương thức nghiệp vụ Session Bean  Triển khai phương thức nghiệp vụ RemoteSessionBean.java (Alt + Insert) IT Research Department @BKAP 2015 Page 19 / 25 Enterprise Application Development in Java EE  RemoteSessionBean.java package sessionBean; import javax.ejb.Stateless; /** * * @author admin */ @Stateless public class RemoteSessionBean implements RemoteSessionBeanRemote { @Override public String autoIncrement(String valuecurrent, int fixedletter) { int count = valuecurrent.length(); String nextcurrent = valuecurrent.substring(0, fixedletter); valuecurrent = valuecurrent.substring(fixedletter); int y = Integer.parseInt(valuecurrent); y = y + 1; String stint = Integer.toString(y); int count0 = count - (stint.length() + fixedletter); for (int i = 0; i < count0; i++) { nextcurrent += "0"; } nextcurrent += stint; return nextcurrent; IT Research Department @BKAP 2015 Page 20 / 25 Enterprise Application Development in Java EE } } Step 5: Tạo Client gọi Stateless Session Bean qua interface Remote  File  New Project  Java EE  Enterprise Application Client IT Research Department @BKAP 2015 Page 21 / 25 Enterprise Application Development in Java EE Step 6: Triển khai hàm main Client  Gọi RemoteSessionBean (Alt + Insert) IT Research Department @BKAP 2015 Page 22 / 25 Enterprise Application Development in Java EE  Main.java package s01_02client; import java.util.Scanner; import javax.ejb.EJB; import sessionBean.RemoteSessionBeanRemote; /** * * @author admin */ public class Main { @EJB private static RemoteSessionBeanRemote remoteSessionBean; /** * @param args the command line arguments */ public static void main(String[] args) { Scanner in = new Scanner(System.in); IT Research Department @BKAP 2015 Page 23 / 25 Enterprise Application Development in Java EE System.out.println("Enter Current Value"); String currentvalue = in.nextLine(); System.out.println("Enter Fixed Letter"); int fixedletter = in.nextInt(); String nextvalue = remoteSessionBean.autoIncrement(currentvalue, fixedletter); System.out.println("Next Value: "+nextvalue); }  Cấu trúc ứng dụng sau hoàn thành IT Research Department @BKAP 2015 Page 24 / 25 Enterprise Application Development in Java EE Step 7: Build and Run Client Phần II Bài tập tự làm Bài tập: Tạo ứng dụng EJB có SessionBean Stateless Session Bean thực nghiệp vụ sau (Theo interface Local Remote): - Tìm từ dài xâu ký tự nhập vào Nếu có nhiều từ có độ dài chọn từ xâu (VD: Nguyen Duy Quang  Kết quả: Nguyen) - Từ dài vị trí (VD: Nguyen  1, Duy  2, Quang  3) - Nhập vào tên người theo thứ tự Họ-Đệm-Tên, chuyển thành Tên-Họ-Đệm (VD: Nguyen Duy Quang  Quang Nguyen Duy) IT Research Department @BKAP 2015 Page 25 / 25 ... javax.servlet.http.HttpServletResponse; import sessionBean.S01_02SessionBeanLocal; /** * * @author admin */ public class S01_02Servlet extends HttpServlet { @EJB private S01_02SessionBeanLocal s01_02SessionBean; /** * Processes... Development in Java EE S01_02SessionBean.java package sessionBean; import javax.ejb.Stateless; /** * * @author admin */ @Stateless public class S01_02SessionBean implements S01_02SessionBeanLocal... name="convertToNoun" value="ConvertToNoun"/>  Tạo Servlet Session01_02.war để gọi Local Bean  Session01_02.war  New  Other  Web  Servlet IT Research Department @BKAP 2015 Page