Thực hành EJB (Enterprise Java Bean) Lab 9 + 10

IT Research Department @BKAP 2015 Page 1 / 25 Lab 09 - 10 Persistence of Entities Advanced Persistence Concepts Mục tiêu - Tạo một Entity Class và Persistence Unit trong ứng dụng Ent

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IT Research Department @BKAP 2015 Page 1 / 25

Lab 09 - 10

Persistence of Entities

Advanced Persistence Concepts

Mục tiêu

- Tạo một Entity Class và Persistence Unit trong ứng dụng Enterprise

- Tạo liên kết giữa các thực thể

- Tạo Web Client để test

Phần I Bài tập step by step

Bài 6.1

Tạo một Entity Class từ một bảng trong Database và tạo Persistence Unit từ JNDI

Step 1: Tạo Database CRMDB

 Tạo bảng Customer có các trường

 CustomerId: Int, Primary Key, Identity(1,1)

 CustomerName: Nvarchar(50)

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Step 2: Tạo JDBC Connection Pools có tên CRMPool kết nối với CRMDB

Step 3: Tạo JDBC Resources có tên jdbc/CRMDS với Pool Name là CRMDB

Step 4: Tạo ứng dụng Enterprise CRMApplication

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 Ứng dụng sau khi hoàn thành

Step 5: Tạo Entity Class Customer và Persistence Unit

 CRMApplication-ejb  New  Other  Persistence  Entity Class

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 Ứng dụng sau khi hoàn thành

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public class Customer implements Serializable {

private static final long serialVersionUID = 1L;

//Map id voi column CustomerID

private String customerName;

//Getter and Setter

public Long getId() {

return id;

}

public void setId(Long id) {

this.id = id;

}

public String getCustomerName() {

return customerName;

}

public void setCustomerName(String customerName) {

this.customerName = customerName;

public boolean equals(Object object) {

// TODO: Warning - this method won't work in the case the id fields are not set

if (!(object instanceof Customer)) {

return false;

}

Customer other = (Customer) object;

if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {

return false;

}

return true;

}

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//Override phuong thuc toString

@Override

public String toString() {

return "entity.Customer[ id=" + id + " , name=" + customerName + " ]";

Step 6: Tạo Stateless Session Bean với tên CustomerBean thực hiện tạo một Customer

 CRMApplication-ejb  New  Other  Enterprise JavaBeans  Session Bean

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 Khai báo phương thức tạo Customer ở CustomerBeanLocal.java

package beanpack;

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public interface CustomerBeanLocal {

public void createCustomer(Customer customer);

Step 7: Tạo form nhập thông tin Customer: CustomerForm.jsp

 CRMApplication-war  Web Pages  New  Other  Web  JSP

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<title>Create Customer</title>

</head>

<body>

<h2>Create Customer</h2>

Customer Name: <input type="text" name="customerName"/><br/>

</form>

</body>

</html>

Step 8: Tạo Servlet CustomerServlet

 CRMApplication-war  New  Other  Web  Servlet

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 CustomerServlet.java

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* @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");

String customerName = request.getParameter("customerName");

try (PrintWriter out = response.getWriter()) {

/* TODO output your page here You may use following sample code */

//Khoi tao Customer Entity va set thuoc tinh customerName cho no

Customer customer = new Customer();

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// <editor-fold defaultstate="collapsed" desc="HttpServlet methods Click on the + sign on the left to edit the code.">

/**

* Handles the HTTP <code>GET</code> method

*

*/

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

*/

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse response)

public String getServletInfo() {

return "Short description";

<servlet-name>CustomerServlet</servlet-name>

<servlet-class>servlet.CustomerServlet</servlet-class>

</servlet>

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<servlet-mapping>

<servlet-name>CustomerServlet</servlet-name>

<url-pattern>/CustomerServlet</url-pattern>

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Step 2: Tạo Address Entity trong package entity của module CRMApplication-ejb (bài 6.1)

Tạo mối liên kết giữa Address Entity và Customer Entity

 CRMApplication-ejb  Source Packages  entity  RC  New  Other 

Persistence  Entity Class

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public class Address implements Serializable {

@Id

@Column(name = "AddressId")

@GeneratedValue(strategy = GenerationType.IDENTITY)

private Long id;

return id;

}

this.id = id;

private String addressLine;

//Lien ket Address voi Customer

@ManyToOne

@JoinColumn(name = "CustomerId")

private Customer customer;

//Getter and Setter

public String getAddressType() {

return addressType;

}

public void setAddressType(String addressType) {

this.addressType = addressType;

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}

public String getAddressLine() {

return addressLine;

}

public void setAddressLine(String addressLine) {

this.addressLine = addressLine;

}

public Customer getCustomer() {

return customer;

}

public void setCustomer(Customer customer) {

this.customer = customer;

if (!(object instanceof Address)) {

return false;

}

Address other = (Address) object;

return "entity.Address[ id=" + id + " ]";

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public class Customer implements Serializable {

//Map id voi column CustomerID

@Id

@Column(name = "CustomerId")

@GeneratedValue(strategy = GenerationType.IDENTITY)

private Long id;

//Map customerName voi column CustomerName

@Column(name = "CustomerName")

private String customerName;

//Map One to Many voi Address

@OneToMany(cascade = CascadeType.PERSIST, mappedBy = "Customer")

private List<Address> listAddress;

//Constuctor

public Customer() {

this.listAddress = new ArrayList<>();

}

//Getter and Setter

return id;

}

this.id = id;

}

public String getCustomerName() {

return customerName;

}

public void setCustomerName(String customerName) {

this.customerName = customerName;

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this.listAddress = listAddress;

if (!(object instanceof Customer)) {

return false;

}

Customer other = (Customer) object;

return "entity.Customer[ id=" + id + " , name=" + customerName + " ]";

public interface CustomerBeanLocal {

public void createCustomer(Customer customer, List<Address> listAddress);

}

 CustomerBean.java

package beanpack;

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<title>Create Customer</title>

</head>

<body>

<h2>Create Customer</h2>

Customer Name: <input type="text" name="customerName"/><br/>

Present Address: <input type="text" name="presAddress"/><br/>

Permanent Address: <input type="text" name="permAddrss"/><br/>

</form>

</body>

</html>

 CRMApplication-war  CustomerServlet.java

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*/

protected void processRequest(HttpServletRequest request, HttpServletResponse response)

response.setContentType("text/html;charset=UTF-8");

String customerName = request.getParameter("customerName");

String presAddress = request.getParameter("presAddress");

String permAddress = request.getParameter("permAddress");

try (PrintWriter out = response.getWriter()) {

/* TODO output your page here You may use following sample code */

//Khoi tao Customer Entity va set thuoc tinh customerName cho no

Customer customer = new Customer();

customer.setCustomerName(customerName);

List<Address> listAddress = new ArrayList<>();

//Add Present Address

if (presAddress != null && !presAddress.isEmpty()) {

Address addr = new Address();

addr.setAddressType("Present");

addr.setAddressLine(presAddress);

listAddress.add(addr);

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}

//Add Permanent Address

if (permAddress != null && !permAddress.isEmpty()) {

Address addr = new Address();

*/

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

*/

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse response)

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@Override

public String getServletInfo() {

return "Short description";

}// </editor-fold>

}

Step 5: Build and Run Application

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