EJB Programming Using Eclipse & JBoss

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Hand-onExercises

การพัฒน�ฒนาโปรแกรมEJB 3.0 and JPA

โดยใช้� �Eclipse และ JBoss

Assoc.Prof.Dr.Thanachart NumnondaSoftware Park Thailand

andAsst Prof.Thanisa Kruawaisayawan

King Mongkut's Institute of Technology Ladkrabang

June 2011

�� Enterprise Java Bean 3.0 Assoc.Prof.Dr.Thanachart Numnonda/ Asst Prof.Thanisa Kruawaisayawan

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บทนำ��

�� Java 301 : EJB 3.0 �� Mini Master of Java

Technology !"��#!��#$��%��&�� & �!'"#��&'��!(��)*�� +,� ��-� �� &%.��Java Enterprise Application #�*�� Enterprise Java Bean 3.0 ��+Java Persistence API #��/.�� !�)*��)��&��Eclipse ��+JBoss Application Server

[email protected] twitter.com/thanachart

www.facebook.com/thanachart www.thaijavadev.com

��%'��2554


mailto:[email protected]

http://www.thaijavadev.com/

http://www.facebook.com/thanachart

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สารบัญ��ญExercise 1 Stateless Session Bean Using EJB 3.0................................................................................4Exercise 2 Stateful Session Bean Using EJB 3.0...............................................................................21Exercise 3 Entity Class (JPA).............................................................................................................26Exercise 4 การพัฒนาJSP เพื่อเ�ฒนา JSP เพัฒนาJSP เพื่อเอเร�ยกใช้ EJB 3.036��x��1�King � EJB 3.0.....................................................................................36Exercise 5 JPA : Entity Relationships................................................................................................41Exercise 6 JPA: Inheritance................................................................................................................60Exercise 7 Message Driven Bean.......................................................................................................70Exercise 8 EJB Security.....................................................................................................................75Exercise 9 Using Java Persistence API in Visual Web JSF applications...........................................83


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Exercise 1 Stateless Session Bean Using EJB 3.0

��/.�� 0��Enterprise Java Bean (EJB) �� EJB 3.0 �� Session

Bean �� 1�� Session Bean &��Web Application �� Java Servlet ��&��+Desktop Application �� Java SE

ข��นตอนในการพัฒนาโปรแกรม��ฒนาโปรแกรม1. �� Enterprise Application Project

2. ��Session Bean

3. ��Web Application

4. ��Desktop Application

1.1 ก�รสร�ง Enterprise Application Project

�� Project ��Enterprise Application 2.*��EJB Module ��Web Module 3�� Project

1. �� Project ��)��File → New → Enterprise Application Project

�4��Project Name �0��SessionBeanDemo

2. �� Server #�*&��Click #�*'1��New Runtime...

�4��Directory #�*��JBoss Application Server ��13. ��Next ��'1��New Module... ��)��EJB Module ��Web Module ��Finish &�&��Wizard


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ร�ปที่ �� 1.1 การสร�าง Enterprise Application Project


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1.2 ก�รพัฒน�ฒนำ��โปรแกรม Session Bean

��EJB &�� Session Bean �� 1��)*�5�3��EJB Container

�� Session Bean &�� Business Method 1��5��/.��&�� Session Bean #�*�)*�+BLSession #�*��Business method ��6��!)�

● String sayHi(String name)● double currencyConvert(String currency, double amt)

��%#�*&�� -� ��1. !��7��#�*�SessionBeanDemoEJB → New → Session Bean(EJB 3.x)

2. �4��Java package = ejbClass Name = BLSession State Type = Stateless Create Business Interface ��)��#��Remote ��Local ��#�*�1.2

ร�ปที่ �� 1.2 ไดอะล็อกการสร้าง S�อกการสร�าง Session Bean


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3. � ��Finish ��&�� -8�( 1��5��

ร�ปที่ �� 1.3 โครงสร�างของไฟล็อกการสร้าง S ของ Session Bean

4. Declare Method Signature 2 methods #�*�Interface BLSessionLocal , BLSessionRemote

Method Name �)*��sayHiReturn Type : StringInput Parameter = name �0� String

Method Name �)*�+ currencyConvertReturn Type : doubleInput Parameter 1 = currency �0��String

Input Parameter 2 = amt �0��double

#4�-� ��4��Signature Method �� Interface? ��2 ��"��!)�1. ,� ��EJB ��1��Virtual Machine ��EJB

,� ��&�� Method #�*��'��Interface BLSessionLocal

2. ,� ��1!�� Virtual Machine ��)�!��!�)*��,� ��&�� Method #�*��'��Interface BLSessionRemote


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Listing 1.1 ��$� Signature Method #�*� Interface #�� Local �� Remote --- File Local--------------------------------------------------------------@Localpublic interface BLSessionLocal {

public String sayHi(String name);public double currencyConvert(String currency,double amt);

}

--- File Remote-------------------------------------------------------------@Remotepublic interface BLSessionRemote {

public String sayHi(String name);public double currencyConvert(String currency,double amt);

}

5. &��0��1��Error ��.��#�*�BLSession.java (Concrete Class) �� mouse ��#�*�Error

eclipse &��1�� implement method #�*�interface ��!��-� ��"��)��#�*��#��Add Unimplemented Methods ��+

ร�ปที่ �� 1.4 ที่ !าการ Implement source code ที่ �� concrete class : BLSession

6. �� Implement source code �4��Business Method #�� public String sayHi(String name) { return "Hello " + name; }

public double currencyConvertor(String currency, double amt) { if (currency.equals("baht")) { return (amt / 35); } else if (currency.equals("euro")) { return (amt * 2); } else { return 0; } }


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1.3 ก�รพัฒน�ฒนำ��โปรแกรม Web Application

��EJB &��0��1��Business Logic �#1��1��Presentation &� �� Web Application ��)��Java SE

�� &��Web Application ��)*�� Business Method ��BLSession

#�*�)*��sayHi ��4�� ,� �� 1�� (�String myName -�Servlet #�*�)*��SayHiServlet

1. !��7��#�*�SessionBeanDemoWeb ��)��New → Servlet

2. �4��Package = controller Class Name = SayHiServlet

ร�ปที่ �� 1.5 สร�าง Servlet เพัฒนาโปรแกรม�#�อต$ดต%อก�บ EJB3


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3. Set �� Web Project �� &��EJB Project ��!��#�*�SessionBeanDemoWeb

��)��Build Path → Configure Build Path

ร�ปที่ �� 1.6 ที่ !าให้ Web Projec� Web Project มองเห้ Web Projec�น EJB Project

4. ��*��Source code ��EJB #�*�Servlet ��Declare �0��Instant Variable

public class SayHiServlet extends HttpServlet {

@EJBprivate BLSessionLocal blSession;..............................

5. �� '��Source code ��6��processRequest ��protected void processRequest(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException

{request.setCharacterEncoding("TIS-620");response.setContentType("TIS-620"); PrintWriter out = response.getWriter();out.println("<html><body>");out.println(blSession.sayHi(request.getParameter("myName")));out.println("</body></html>");out.close();

}


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1.4 ก�รทดสอบโปรแกรม

1. #4�� Add �� SessionBeanDemo �� 1�JBoss Application Server

2. ��1�URL ��Web Browser �0�http://localhost:8080/SessionBeanDemoWeb/SayHiServlet?myName=Thana

3. ��Web Browser &�� !��Hello Thana ��


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1.5 ก�รพัฒน�ฒนำ��โปรแกรม Desktop Application ติดต่อกับ EJB 3.0�姍�x�愭楬��2�โปรแกรม W�ดติดต่อกับ EJB 3.0�姍�x�愭楬��2�โปรแกรม W�อก�บ EJB 3.0

��%#�*&��Desktop Application ��)*�#�*&�� EJB �� &��0��Java SE ��)*�� Business Method ��BLSession ��&�#4��!)��Main.java &��6��#�*�)*��sayHi &��command prompt �1��#�*��!)��CurrencyConvertor.java &��6��#�*�)*��currencyConvert ��4�� GUI ��)*�� ,� �� )*�� 4��'��&4��

1. !��#�*�SessionBeanDemo ��)��New → Application Client Module

�4��Project Name = SessionBeanDemoClient

2. !��)��check box �0� Add project to an EAR ��)��dropdown �)*��SessionBeanDemo

ร�ปที่ �� 1.7 การเพัฒนาโปรแกรม�$�ม Enterprise Application Client เข�าส�% Enterprise Application Project


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1.5.1 � -��+ +EJB Project (+ +��*��+ +Mapping Name)+ +��)*�� Application Client �� SessionBean ��EJB -� &� ��Register �)*��SessionBean �� 1 �Context ��)��1��Mapping

-#�*�SessionBeanDemoEJB

#�*�@Stateless �� *��0�� Ctrl+Space &��hint �� )��mappedName � ��1�)*�#�* ��

ร�ปที่ �� 1.8 การเพัฒนาโปรแกรม�$�มชื่อของ Session Bea#�อของ Session Bean เข�าส�% Context ของ JBoss Application Server

1.5.2 ��+ +Main.java+ +Implement Source code ��Main.java ��

import java.util.Hashtable;import javax.naming.Context;import javax.naming.InitialContext;import javax.naming.NamingException;import ejb.BLSessionRemote;public class Main { public static void main(String[] args) throws NamingException {

Context ctx = getJBossNamingContext();BLSessionRemote sb = (BLSessionRemote)ctx.lookup("SessionBeanForClient");String result = sb.sayHi("Thana");System.out.println(result);

}

public static Context getJBossNamingContext() throws NamingException{Hashtable<String, String> env = new Hashtable<String, String>();env.put("java.naming.factory.initial","org.jboss.naming.NamingContextFactory");env.put("java.naming.provider.url", "localhost:1099");return new InitialContext(env);

} }

#�*�Method getJBossNamingContext() ��1��Config %.��host:port ��Naming Service

(�0�#�*5��&�� -%��Session Bean �)*��9SessionBeanForClient”) ��&� ��port ��Server #�*��+EJB ��1�2.*�#4�-� ��double click #�*�Server JBoss ��


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ร�ปที่ �� 1.9 การห้ Web Projecา JNDI port ของ Server ที่ �� EJB Project Deploy อยู่��t ��A�Hashtable<String, String> env = new Hashta�%

&��#4��Application &�-� ,��6(!)��Hello Thana print ��#�*�Console


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1.5.3 ��+ +CurrencyConvertor.java+ +

��Desktop Application &��:"��&�� GUI Designer (Jigloo) ��

ร�ปที่ �� 1.10 GUI ของโปรแกรม CurrencyConvertor

1. !��#�*��SessionBeanDemoClient ��)��appClientModule → New → Other... → GUI Forms → Swing → Jframe &��-��0��.��4��Package = swing ��Class Name = CurrencyConvertor

ร�ปที่ �� 1.11 สร�าง Swing GUI


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2. !��7�#�*�JFrame � ��*��property #�*�)*��title �0��Currency Convertor


3. ��*��JPanel ��Form


4.


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5. ��-�!��Label ��Swing Controls &��Table Compoments Drag & Drop -#�*�� 1�� 4��!1��

ร�ปที่ �� 1.14 การวาง Label ใน Components Windows

6. !��7��)��jLabel 1�� *��property #�*�)*��text �0��currency, amount ��value

7. ��-�!��Combo Box �� 4��1�#��)��currency &��property �� )��model

��4��Item �� 0��baht ��euro ��

ร�ปที่ �� 1.15 การก!าห้ Web Projecนดค%า item ของ ComboBox


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8. #4��implement sourcecode ��

9. Implement source code ��"�#�*��'1��Calculate �� -��source code ��

private void jButton1ActionPerformed(ActionEvent evt) {System.out.println("jButton1.actionPerformed, event="+evt); try {

Context ctx = getJBossNamingContext(); BLSessionRemote obj = (BLSessionRemote) ctx.lookup("SessionBeanForClient"); int index = jComboBox1.getSelectedIndex(); String currency = (String) jComboBox1.getItemAt(index); String amtStr = jTextField1.getText(); double amt = Double.parseDouble(amtStr); double usDollar = obj.currencyConvertor(currency, amt); jTextField2.setText(usDollar + ""); } catch (Exception ex) { ex.printStackTrace(); }}

public Context getJBossNamingContext() throws NamingException{ Hashtable<String, String> env = new Hashtable<String, String>();

env.put("java.naming.factory.initial","org.jboss.naming.NamingContextFactory"); env.put("java.naming.provider.url", "localhost:1099"); return new InitialContext(env);}

10. '1��Exit #4��1��'1��Calculateprivate void jButton2ActionPerformed(ActionEvent evt) {

System.out.println("jButton2.actionPerformed, event=" + evt);System.exit(0);

}11. #��)��'�� &4�� '1��Calculate


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Source Code #�*�Jigloo �� .��#�*��'�#��package swing;

import com.jgoodies.forms.layout.CellConstraints;import com.jgoodies.forms.layout.FormLayout;

import ejb.BLSessionRemote;

import java.awt.BorderLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.Hashtable;

import javax.naming.*;import javax.swing.ComboBoxModel;import javax.swing.DefaultComboBoxModel;import javax.swing.JButton;import javax.swing.JComboBox;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;

import javax.swing.WindowConstants;import javax.swing.SwingUtilities;

import org.apache.bsf.Main;

/** * This code was edited or generated using CloudGarden's Jigloo SWT/Swing GUI * Builder, which is free for non-commercial use. If Jigloo is being used * commercially (ie, by a corporation, company or business for any purpose * whatever) then you should purchase a license for each developer using Jigloo. * Please visit www.cloudgarden.com for details. Use of Jigloo implies * acceptance of these licensing terms. A COMMERCIAL LICENSE HAS NOT BEEN * PURCHASED FOR THIS MACHINE, SO JIGLOO OR THIS CODE CANNOT BE USED LEGALLY FOR * ANY CORPORATE OR COMMERCIAL PURPOSE. */public class CurrencyConverter extends javax.swing.JFrame {

private JPanel jPanel1;private JLabel jLabel3;private JButton jButton1;private JComboBox jComboBox1;private JButton jButton2;private JTextField jTextField2;private JTextField jTextField1;private JLabel jLabel2;private JLabel jLabel1;

/** * Auto-generated main method to display this JFrame */public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {public void run() {

CurrencyConverter inst = new CurrencyConverter();inst.setLocationRelativeTo(null);inst.setVisible(true);

}});

}

public CurrencyConverter() {super();initGUI();

}

private void initGUI() {try {

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);{

jPanel1 = new JPanel();FormLayout jPanel1Layout = new FormLayout(

"53dlu, 42dlu, 41dlu, 44dlu", "max(p;5dlu), max(p;5dlu), max(p;5dlu), max(p;5dlu)");

getContentPane().add(jPanel1, BorderLayout.CENTER);jPanel1.setLayout(jPanel1Layout);jPanel1.setPreferredSize(new java.awt.Dimension(182, 104));{

jLabel1 = new JLabel();jPanel1.add(jLabel1, new CellConstraints(

"1, 1, 1, 1, default, default"));jLabel1.setText("Currency");

}{


"1, 2, 1, 1, default, default"));jLabel2.setText("Amount");

}{


"1, 3, 1, 1, default, default"));jLabel3.setText("Value [Dollars] ");

}{

jTextField1 = new JTextField();jPanel1.add(jTextField1, new CellConstraints(

"2, 2, 1, 1, default, default"));}{

jTextField2 = new JTextField();


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jPanel1.add(jTextField2, new CellConstraints("2, 3, 1, 1, default, default"));

}{

jButton1 = new JButton();jPanel1.add(jButton1, new CellConstraints(

"1, 4, 1, 1, default, default"));jButton1.setText("Calculate");jButton1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {jButton1ActionPerformed(evt);

}});

}{

jButton2 = new JButton();jPanel1.add(jButton2, new CellConstraints(

"2, 4, 1, 1, default, default"));jButton2.setText("Exit");jButton2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent evt) {jButton2ActionPerformed(evt);

}});

}{

ComboBoxModel jComboBox1Model = new DefaultComboBoxModel(

new String[] { "baht", "euro" });jComboBox1 = new JComboBox();jPanel1.add(getJComboBox1(), new CellConstraints("2, 1, 1, 1, default, default"));jComboBox1.setModel(jComboBox1Model);

}}pack();

} catch (Exception e) {e.printStackTrace();

}}

private void jButton2ActionPerformed(ActionEvent evt) {System.out.println("jButton2.actionPerformed, event=" + evt);System.exit(0);

}public JComboBox getJComboBox1() {

return jComboBox1;}

private void jButton1ActionPerformed(ActionEvent evt) {System.out.println("jButton1.actionPerformed, event="+evt);

try { Context ctx = getJBossNamingContext(); BLSessionRemote obj = (BLSessionRemote) ctx.lookup("SessionBeanForClient"); int index = jComboBox1.getSelectedIndex(); String currency = (String) jComboBox1.getItemAt(index); String amtStr = jTextField1.getText(); double amt = Double.parseDouble(amtStr); double usDollar = obj.currencyConvertor(currency, amt); jTextField2.setText(usDollar + ""); } catch (Exception ex) { ex.printStackTrace(); }}public Context getJBossNamingContext() throws NamingException{

Hashtable<String, String> env = new Hashtable<String, String>();env.put("java.naming.factory.initial","org.jboss.naming.NamingContextFactory");env.put("java.naming.provider.url", "localhost:1099");return new InitialContext(env);

} }


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Exercise 2 Stateful Session Bean Using EJB 3.0

เน#�อห้ Web Projecาที่ ��ต�องศึกษาก่อน Ses-กษาก%อน+++Session Bean Using EJB 3.0

��/.��#�� 0�� Stateful Session Bean �4��Shopping Cart �� EJB 3.0

��4�� Session Bean ��)*��0��Cart ��Business Methods ��6��!)�● void putItem(String itemId, int quantity)● void removeItem(String itemId)● Hashtable getItems()

��&�� &��6��#�*%��&��@PostConstruct !)�● void initialize()

��Bean Class &�� &0!�(instance variable) �� !)�● String customerId● Hashtable cart

��/.�� &�� Java Servlet �.��)*�� Cart Session Bean #�*�)*�+CartManager.java ��)*�� *�/��&��Cart ��)*��#�*��1��Cart ��,� #�*�� CartManager &� ��1�� (#�*�)*��action ��)��'�1� ��#4��-��Cart ��action ��

● add ��)*��*��Cart

● remove ��)*��&��Cart

● list ��)*��Cart

[�� '�% �� Servlet ��5-8�(��)*�#4�� #�* 1��1��AddCartServlet,

RemoveCartServlet ��ListCartServlet ��Stateful Session Bean &�� bean instance

�4��Servlet 1�� #4�� Session #�* 1��]

�� 1. ��Stateful Session Bean

2. ��CartManager.java

3. ��CartList.java

2.1 ก�รพัฒน�ฒนำ��โปรแกรม Stateful Session Bean

��/.��&�� &0!��(SessionBeanDemo) #�*�� /.��Session Bean Using

EJB 3.0 �� Stateful Session Bean �� -� ��


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1. !��7��#�*�SessionBeanDemoEJB → New → Session Bean(EJB 3.x)

2. �4��Java package = ejb , Class Name = Cart ��State Type = Stateful

ร�ปที่ �� 2.1 การก!าห้ Web Projecนดค%าของ Cart Stateful Session Bean

3. #4�� Add Business Method ��*�&�� Signature Method ��Interface CartLocal ��+CartRemote ��

Declare Method Signature 3 methods #�*�Interface CartLocal , CartRemote

Method Name �)*��putItem

Input Parameter 1 = itemId �0� String

Input Parameter 2 = quantity �0��int

Method Name �)*�+removeItem

Input Parameter = itemId �0� String

Method Name �)*��getItemsReturn Type : Hashtable


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4. &�-� �Business Method ��1��Interface #��(local,remote) 3 Methods !)�void putItem(String itemId , int quantity);void removeItem(String itemId);Hashtable getItems();Implement source code ��Listing 2.1 ��2.2

Listing 2.1 �� CartLocal.java package ejb;import java.util.Hashtable;import javax.ejb.Local;

@Localpublic interface CartLocal {

void putItem(String itemId, int quantity);void removeItem(String itemId);Hashtable getItems();

}Listing 2.2 �� CartRemote.java

package ejb;

import java.util.Hashtable;

import javax.ejb.Remote;

@Remotepublic interface CartRemote {

void putItem(String itemId, int quantity);void removeItem(String itemId);Hashtable getItems();

}


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5. &��Fix Error ��Class Cart.java ��Implement source code ��Listing 2.3 ��Listing 2.3 �� Cart.java

package ejb;

import java.util.Hashtable;import javax.annotation.PostConstruct;import javax.ejb.Stateful;

@Statefulpublic class Cart implements CartRemote, CartLocal {

Hashtable<String, Integer> cart;@PostConstructpublic void initialize(){

cart = new Hashtable<String, Integer>();}@Overridepublic void putItem(String itemId, int quantity) {

cart.put(itemId, quantity);}

@Overridepublic void removeItem(String itemId) {

cart.remove(itemId);}

@Overridepublic Hashtable getItems() {

return cart;}

}

2.2 ก�รพัฒน�ฒนำ��โปรแกรม CartManager.java

��CartManager.java �0��Java Servlet ��)*�� Business Method ��Cart

Bean ��*��Cart ��4�� ,� �� 1�� (��● itemId !)��! �● quantity !)�&4��! �● method % ��!1��0��add !)��*��% ��!1��0��remove !)��

�'�!4��*� 1��5�3��CartManager �6��-� ��

1. ��$ ��cart �0��CartLocal �� annotation #�*�)*��@EJB ��@EJB private CartLocal cart;


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2. !4��*��1��!1�� ( 1��5��4�� (�1�,1��&��request !)��action, item ��quantity ��!4��*��

String action = request.getParameter("action"); String item = request.getParameter("item"); String quantity = request.getParameter("quantity"); cart.putItem(item, Integer.parseInt(quantity));

3. !4��*��Enterprise Bean ��action #�* 1��

if (action.equals("add")) { cart.putItem(item, Integer.parseInt(quantity)); } else if (action.equals("remove")) {

cart.removeItem(item);} else if (action.equals("list")) {

Hashtable items = cart.getItems();………

}�� + +Class CartManager+ +

1. ��)�� 1��Projects � �!��7��#�*��SessionBeanDemoWeb

&��)��!4��*��New → Servlet

�4��Package = controller , Class Name = CartManager

2. �� 1��Editor �� *��Source code ��EJB ��$�instant variable �0��CartLocal ��&��)*��EJB ,1��Interface CartLocal

@EJB private CartLocal cart;

3. Implement source code ��Method processRequest( ) ��Listing 2.4 �� CartManager.java package controller;

import java.io.IOException;import java.io.PrintWriter;import java.util.Enumeration;import java.util.Hashtable;

import javax.ejb.EJB;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

import ejb.CartLocal;public class CartManager extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

processRequest(request, response);}

protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

processRequest(request, response); }


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@EJBprivateCartLocal cart;protected void processRequest(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("TIS-620");response.setContentType("TIS-620");PrintWriter out = response.getWriter();

String action = request.getParameter("action");String item = request.getParameter("item");String quantity = request.getParameter("quantity");out.println("<html><body><h1>Cart Manager</h1>");

if (action.equals("add")) {cart.putItem(item, Integer.parseInt(quantity));

} else if (action.equals("remove")) {cart.removeItem(item);

} else if (action.equals("list")) {Hashtable items = cart.getItems();Enumeration itemNames = items.keys();while (itemNames.hasMoreElements()) {

String itemId = (String) itemNames.nextElement();out.println("Item id: " + itemId + " Quantity : "

+ items.get(itemId));out.println("<BR>");

}}out.println("</body></html>");

}}


1. #4��Publish ��)*�� #'��Project #4��Synchronized ��+

ร�ปที่ �� 2.2 การ Publish เพัฒนาโปรแกรม�#�อ Synchronized Project ใน Enterprise Application

2. #4��1��)��URL ��Web Browser �0�http://localhost:8080/SessionBeanDemoWeb/CartManager?action=add&item=125&quantity=3��#4��1��*�� )��URL ��Web Browser �0�+http://localhost:8080/SessionBeanDemoWeb/CartManager?action=add&item=123&quantity=23. ��Cart ��)��URL �0�

++++++++++++http://localhost:8080/SessionBeanDemoWeb/CartManager?action=list4. #��)��URL ��Web Browser �0�

++++++++++++http://localhost:8080/SessionBeanDemoWeb/CartManager?action=remove&item=1235. ��Cart ��1��)��URL �0�

+++++++++++http://localhost:8080/SessionBeanDemoWeb/CartManager?action=list


http://localhost:8080/SessionBeanDemoWeb/CartManager?action=add&item=123&quantity=2

http://localhost:8080/SessionBeanDemoWeb/CartManager?action=add&item=123&quantity=2

http://localhost:2160/SessionBeanDemo-war/CartManager?item=124&quantity=3

http://localhost:2160/SessionBeanDemo-war/CartManager?item=124&quantity=3

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Exercise 3 Entity Class (JPA)

��/.��#�� 0��Enterprise Java Bean (EJB) ��&��0�� 1��;�� MySQL �� EJB3.0 ��JBoss Application Server &�� Entity Class #�*��)*�� #�*�)*��books ��Session Bean ��)*�� &��*�� -�� table books -� �

ข��นตอนในการพัฒนาโปรแกรม��ฒนาโปรแกรม1. �� Enterprise Application Project

2. ��Entity Class

3. ��Session Bean

4. ��Web Application

3.1 ก�รสร�ง Enterprise Application Project �� Enterprise Application Project ��EJB Module ��Web Module ��13��Project

1. ��)��File → New → Enterprise Application Project

�4��Project Name = BookApp

2. �� Module ��1

ร�ปที่ �� 3.1 สร�าง Module EJB แล็อกการสร้าง Sะ Web ใน Enterprise Application


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3.2 ก�ร Config ให้ Project ใช Project ใช้งาน JPA เพื่อเชื่อมต่อกง�นำ� JPA เพัฒน��อเช้งาน JPA เพื่อเชื่อมต่อก��อมติดต่อกับ EJB 3.0�姍�x�愭楬��2�โปรแกรม W�อก�บ Database ได

Java EE 5 &�� !��3#�Entity ��)*��0��&0!#�*��!� �� ;�� #�*�� &�� Entity Class #�*�)*��Books.java &�� #�*�)*��books 2.*�� 1��

1. Copy EclipseLink , MySQLConnection (.jar file) -#�*�%JBOSS_HOME\common\lib

2. !��#�*�BookAppEJB ��)��Build path → Configure Build path...

3. ��)��Project Facets → JPA #4��Config ��


29


30

ร�ปที่ �� 3.2 Configuration ส%วนของ EclipseLink ใน EJB Project

4. �� JNDI DataSource �� JBoss (!� ��*��file context.xml ��Tomcat6)

��Folder $JBOSS_HOME\docs\examples\jca\ � ��copy file mysql-ds.xml -#�*+$JBOSS_HOME\server\default\deploy\

5. #4��config file mysql-ds.xml ��

ร�ปที่ �� 3.3 Config JNDI Context ให้ Web Projec� JBoss


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6. Config persistence.xml ��BookAppEJB ��)*�� JPA �� Database #�*��'

ร�ปที่ �� 3.4 Config persistence.xml

7. #4��*��JVM Arguments -Djava.endorsed.dirs=$JBOSS_HOME/lib/endorsed

ร�ปที่ �� 3.5 Config persistence.xml

8. Add (Deploy) BookApp �� JBoss ��#4��Start JBoss Application Server

Monitor ��log #�*�Console ��-�1��ERROR


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3.3 ก�รพัฒน�ฒนำ��โปรแกรม Entity Class �� Entity Classes ��!��#�*�BookAppEJB → New → Entities from Tables

ร�ปที่ �� 3.6 แสดงการสร�าง Entity Class

&�-� �Entity Class �)*�+++Books.java+ + #�*��Getter/Setter ��#'��Field ��table books

��*��1�� statement ��Query � ��-#�*��#�� 1��@Table(name = "books") ��@NamedQuery (name = "Books.findByIsbn", query = "SELECT b FROM Books b WHERE b.isbn = :isbn")


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Listing 3.1 �� Books.java package entity;import java.io.Serializable;import javax.persistence.*;

@Entity@Table(name="books")@NamedQuery (name = "Books.findByIsbn",

query = "SELECT b FROM Books b WHERE b.isbn = :isbn")public class Books implements Serializable {


@Id@Column(name="ISBN")private String isbn;

@Column(name="AUTHOR")private String author;

@Column(name="PRICE")private float price;

@Column(name="TITLE")private String title;

public String getIsbn() {return this.isbn;

}

public void setIsbn(String isbn) {this.isbn = isbn;

}

public String getAuthor() {return this.author;

}

public void setAuthor(String author) {this.author = author;

}

public float getPrice() {return this.price;

}

public void setPrice(float price) {this.price = price;

}

public String getTitle() {return this.title;

}

public void setTitle(String title) {this.title = title;

}

}


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3.4 ก�รพัฒน�ฒนำ��โปรแกรม Session Bean

��EJB &�� Session Bean �� 1��)*�5�3��EJB Container ��1��&� �� 1��Entity Class ��,1��Session Bean ��/.��&�� Session Bean #�*�)*�+BooksFacade.java #�*��Business method �� #�*�)*��books �� Entity Class �)*�+Books.java ��EntityManager ��&��

1. !��#�*��BookAppEJB ��)��New → SessionBean (EJB 3.x)

ร�ปที่ �� 3.7 แสดงการสร�าง Session Bean

2. �4��Package = sbClass name = BookFacadeeclipse &�� Interface BookFacadeLocal.java ��

3. ��*��Signature method #�*�interface ��! ��)��)*��String isbn ��)*�-��,� Books find(String isbn);


35

Listing 3.2 �� BookLocal.java package sb;import javax.ejb.Local;

import entity.Books;

@Localpublic interface BookFacadeLocal {

Books find(String isbn);}

4. Fix Error #�*�class BookFacade.java implements concrete class

��'�)*��JPA #�*�� !)��BookAppEJB � �� 1��Books.class (Books Entity Class)

-�� entity manager → em.find(Books.class, id);

Listing 3.3 �� BookFacade.java package sb;import javax.ejb.Stateless;import javax.persistence.EntityManager;import javax.persistence.PersistenceContext;

import entity.Books;

@Statelesspublic class BookFacade implements BookFacadeLocal {

@PersistenceContext(unitName = "BookAppEJB")private EntityManager em;@Overridepublic Books find(String isbn) {return em.find(Books.class, isbn);}

}

3.5 ก�รพัฒน�ฒนำ��โปรแกรม Web Application

��EJB &��0��1��Business Logic �#1��1��Presentation &� �� Web Application (��)��Java SE) ��/.�� &��Web Application ��)*�� ,� �� isbn ��)�� 0��findBook.html � ��&��Servlet #�*�)*�+ShowBook.java ��)*��)��1��


36

3.5.1 ��+ +findBook.html+ +

��findBook.html �0��0��&#�*�� 8��(��4�� ,� �� isbn ��)��

1. !��#�*��BookAppWeb ��)��!4��*��New → HTML

2. �4��HTML File Name: �0��findBook � ��Finish

3. ��source code ��-8�(�findBook.html ��Listing #�*��3.4+

Listing 3.4 ��findBook.html<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body> <form action="ShowBook" method="POST"> <h2>Search Book from ISBN</h2> Enter ISBN <input type="text" name="isbn" /> <input type="submit" value="Find" /> </form></body></html>

3.5.2 ��+ +ShowBook.java+ +

��ShowBook.java �0��Java Servlet #�*&��1��ISBN #�*,� �� &�� findBook.html ��&��6��find() ��session bean #�*�)*��BooksFacade ��)*��)��

1. !��#�*��BookAppWeb ��)��New → ServletPackage = servletsFile Name = ShowBook

2. ��*��source code ��EJB (��$�0��Instance Varible)

@EJBprivate BooksFacadeLocal booksFacade;

Eclipse &�& ��Error ��Web -�1��0��EJB Project


37

�� #4��*��Build path �� Library ��EJB Project ��)��#�*�Fix Project Setup

��set Build path ��

ร�ปที่ �� 3.8 แสดงการ Fix Project Setup


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3. �� '��Source code ��6��processRequest ��Listing � ��1��Listing 3.5 �� ShowBook.java

package servlets;

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;import javax.servlet.http.HttpServletResponse;

import sb.BookFacadeLocal;import entity.Books;

public class ShowBook extends HttpServlet {private static final long serialVersionUID = 1L;

@EJBprivate BookFacadeLocal bookFacade;public ShowBook() {

super();}

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {


protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {


protected void processRequest(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("TIS-620");response.setContentType("TIS-620");

PrintWriter out = response.getWriter();

out.println("<html>");out.println("<head>");out.println("<title>Servlet ShowBook</title>");out.println("</head>");out.println("<body>");String isbn = request.getParameter("isbn");Books book = bookFacade.find(isbn);out.println("Title: " + book.getTitle() + "<BR>");out.println("Author: " + book.getAuthor() + "<BR>");out.println("Price: " + book.getPrice() + "<BR>");out.println("</body>");out.println("</html>");out.close();

}}


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1. Re-Publish JBoss Server2. ��http://localhost:8080/BookAppWeb/findBook.html

3. ��isbn #�*��table books � ��Find �� &��0&��)��


http://localhost:8080/BookAppWeb/findBook.html

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Exercise 4 ก�รพัฒน�ฒนำ�� JSP เพัฒน��อเร ยกใช้งาน JPA เพื่อเชื่อมต่อก EJB 3.0

เน#�อห้ Web Projecาที่ ��ต�องศึกษาก่อน Ses-กษาก%อน+Entity Class

��/.�� 0��JSP ��)*�� Entity Class #�*�)*��Books ��Session Bean #�*�)*��BooksFacade 2.*��&��/.��)*��Entity Class � �&�� Stateful Session Bean #�*�)*�+Cart �� Servlet #�*�)*��CartManager.java #�*��&��/.��)*��Stateful Session Bean

Using EJB 3.0 ��)*��1��)*��)��Cart ��)*��#�*��1��Cart �� Project #�*,1��)*��SessionBeanDemoWeb

��showBook.jsp �0��JSP #�*&�� Custom Tag #�*�)*��<EJBTags:GetBooks>

2.*�&��0��Tag #�*�� 6��findAll() ��BooksFacade Session Bean � ��0��List ��)�#��-� ��session ��showBook.jsp �0&��)*��)�#�� ,� �� )��Cart �� -8�( 1��5�!)�

● Tag Library Descriptor● Tag Handler● JSP File

��

4.1.1 �� + +Tag Library Descriptor+ +

-8�(�� &�� 0��)*��Tag 1��5#�*��1��)*��%�4��tag 1��5�� JSP �� !4��*�+<%@taglib ...%> �� Tag Library Descriptor &��

1. !��#�*��BookAppWeb

2. �� 8��(�\Web Pages\WEB-INF\tlds3. �� -8�(#�*�)*��EJBTags.tld ��implements ��


mailto:%25@taglib

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Listing 4.1 โปรแกรม EJBTags.tld <?xml version="1.0" encoding="UTF-8"?><taglib xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" id="WebApp_ID" version="2.1">

<tlib-version>1.2</tlib-version><short-name>EJBTags</short-name><uri>/WEB-INF/tlds/EJBTags</uri><tag>

<name>GetBooks</name><tag-class>tags.GetBooks</tag-class><body-content>scriptless</body-content>

</tag></taglib>

4.1.2 �� -8�(�+ +Tag Handler+ +

-8�(�Tag Handler &��0��&��#�*��.��)*��'�1��)*�� tag � �&� ��#4�!4��*��1��-��#�*��&��4��)*��Tag �0��GetBook ��

1. !��7��#�*�Project BookAppWeb &��)��!4��*��New → Class

�4��Package = tags , Class Name = GetBooks��)��SuperClass = SimpleTagSupport

2. #4��Implement Method �)*��doTag( ) : Call Enterprise Bean �� annotation @EJB @EJB private BooksFacadeLocal booksFacade;

3. �� *��Signature Method => List<Books> findAll(); #�*�interface BookFacadeLocal

Listing 4.2 �� BooksFacadeLocal.java package sb;import java.util.List;import entity.Books;

@Localpublic interface BookFacadeLocal {

Books find(String isbn);List<Books> findAll();

}

4. Fix Error ��Implements BooksFacade.java ��++++ public List<Books> findAll() {

CriteriaQuery cq = em.getCriteriaBuilder().createQuery(); cq.select(cq.from(Books.class)); return em.createQuery(cq).getResultList();

}


http://java.sun.com/xml/ns/javaee

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5. � -��Books.java �� 1�'��Query statement ��-@NamedQueries({@NamedQuery(name = "Books.findAll", query = "SELECT b FROM Books b"),@NamedQuery(name = "Books.findByIsbn", query = "SELECT b FROM Books b WHERE b.isbn = :isbn")})Listing 4.3 �� Books .java package entity;import java.io.Serializable;import javax.persistence.*;

@Entity@Table(name = "books")@NamedQueries({@NamedQuery(name ="Books.findAll",query="SELECT b FROM Books b"),@NamedQuery(name ="Books.findByIsbn",query="SELECT b FROM Books b WHERE b.isbn = :isbn") })public class Books implements Serializable {


@Id@Column(name = "ISBN")private String isbn;@Column(name = "AUTHOR")private String author;@Column(name = "PRICE")private float price;@Column(name = "TITLE")private String title;public String getIsbn() {

return this.isbn;}public void setIsbn(String isbn) {

this.isbn = isbn;}public String getAuthor() {

return this.author;}public void setAuthor(String author) {

this.author = author;}public float getPrice() {

return this.price;}public void setPrice(float price) {

this.price = price;}public String getTitle() {

return this.title;}public void setTitle(String title) {

this.title = title;}

}


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6. Implement source code ��class GetBooks.java #�*��6��doTag() ��

public void doTag() throws JspException {JspWriter out = getJspContext().getOut();

try{JspFragment f = getJspBody();if (f != null)f.invoke(out);List<Books> books = bookFacade.findAll();getJspContext().setAttribute("books",books,PageContext.SESSION_SCOPE);

} catch (IOException ex) {throw new JspException(ex.getMessage());

}}

Listing 4.4 �� GetBooks .java

package tags;import java.io.IOException;import java.util.List;import javax.ejb.EJB;import javax.servlet.jsp.JspException;import javax.servlet.jsp.JspWriter;import javax.servlet.jsp.PageContext;import javax.servlet.jsp.tagext.JspFragment;import javax.servlet.jsp.tagext.SimpleTagSupport;import entity.Books;

import sb.BookFacadeLocal;

public class GetBooks extends SimpleTagSupport {

@EJBprivate BookFacadeLocal bookFacade;@Overridepublic void doTag() throws JspException {

JspWriter out = getJspContext().getOut();

try {JspFragment f = getJspBody();if (f != null)f.invoke(out);List<Books> books = bookFacade.findAll();getJspContext().setAttribute("books",

books,PageContext.SESSION_SCOPE);} catch (IOException ex) {

throw new JspException(ex.getMessage());}

}}


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4.1.3 ��+ +showBook.jsp+ +1. !��#�*�BookAppWeb &��)��!4��*��New → JSP

�4��JSP File Name: �0��showBook

2. �� 1��editor �� -��source code ��-8�(��showBook.jsp �� 0�- ��Listing #�*�4.5

��&�� ,��6(�� 1��#�*�4.1

ร�ปที่ �� 4.1 ผล็อกการสร้าง Sล็อกการสร้าง S�พัฒนาโปรแกรม�ธ์โปรแกรม showB โปรแกรม showBook.jsp


45

Listing 4.5 �� showBook.jsp

<%@page contentType="text/html"%><%@page pageEncoding="UTF-8"%><%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@taglib uri="/WEB-INF/tlds/EJBTags" prefix="EJB" %><html><body> <EJB:GetBooks/> <h1>Please Select Books</h1> <form action="http://localhost:8080/SessionBeanDemoWeb/CartManager" > <input type="HIDDEN" name="action" value="add" /> <table border="1"> <thead> <tr> <th></th> <th> Title </th> <th> Author </th> <th> Price </th> <th> Quantity </th> </tr> </thead> <tbody> <c:forEach var="book" items="${sessionScope.books}"> <tr> <td><input type="checkbox" name="item" value="${book.isbn}" /></td> <td>${book.title}</td><td>${book.author}</td> <td>${book.price}</td> <td><input type="text" name="${book.isbn}" value="0" size="3" />

</td> </tr> </c:forEach> </tbody> </table> <p> <input type="submit" value="Add" /> </form> </body></html>

4.2 ก�รปร�บปร"งโปรแกรม CartManager.java

��+CartManager.java ��&��4�� 1�� 1��! ��Cart #�*��+��)*�� %�1�� ! �#�*&��0��1�� (��String #�*��&��2.*�%��)��&��checkbox #�*��1�� showBook.jsp -� �� -��source code ��-8�(+CartManager.java �1��+ +Business Logic + +��*�� + ++��

if (action.equals("add")) { cart.putItem(item, Integer.parseInt(quantity)); }

�0�

if (action.equals("add")) { String[] items = request.getParameterValues("item"); for (int i = 0; i < items.length; i++) { String qty = request.getParameter(items[i]); cart.putItem(items[i], Integer.parseInt(qty)); } }


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Listing 4.6 โปรแกรม CartManager.java package controller;import java.io.IOException;import java.io.PrintWriter;import java.util.Enumeration;import java.util.Hashtable;import javax.ejb.EJB;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

import ejb.CartLocal;

public class CartManager extends HttpServlet {private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {processRequest(request, response);

}

protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {processRequest(request, response);

}

@EJBCartLocal cart;protected void processRequest(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("TIS-620");response.setContentType("TIS-620");String action = request.getParameter("action");String item = request.getParameter("item");String quantity = request.getParameter("quantity");PrintWriter out = response.getWriter();out.println("<html><body><h1>Cart Manager</h1>");

if (action.equals("add")) { String[] items = request.getParameterValues("item"); for (int i = 0; i < items.length; i++)

{ String qty = request.getParameter(items[i]); cart.putItem(items[i], Integer.parseInt(qty)); }

} else if (action.equals("remove")) {cart.removeItem(item);

} else if (action.equals("list")) {Hashtable items = cart.getItems();Enumeration itemNames = items.keys();while (itemNames.hasMoreElements()) {

String itemId = (String) itemNames.nextElement();out.println("Item id: " + itemId + " Quantity : "

+ items.get(itemId));out.println("<BR>");

}}out.println("</body></html>");

}}


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1. #4��Build ��Deploy ��&0!�SessionBeanDemo ��BookApp

2. �� URL http://localhost:8080/BookAppWeb/showBook.jsp �� #��)��1� ��3. ��)*��'1��Add ��0&��0��)�#�*��)��Cart

4. ��Cart ��)��URL �0�http://localhost:8080/SessionBeanDemoWeb/CartManager?action=list


http://localhost:8080/SessionBeanDemoWeb/CartManager?action=list

http://localhost:8080/BookAppWeb/showBook.jsp

EJB Programming Using Eclipse & JBoss

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