Thực hành EJB (Enterprise Java Bean) Lab 8

IT Research Department @BKAP 2015 Page 1 / 15Mục tiêu - Cấu hình JDBC Connection Pool trên GlassFish Server - Tạo và thực thi Session Bean với Bean-Managed Transasction Phần I Bài tập

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IT Research Department @BKAP 2015 Page 1 / 15

Mục tiêu

- Cấu hình JDBC Connection Pool trên GlassFish Server

- Tạo và thực thi Session Bean với Bean-Managed Transasction

Phần I Bài tập step by step

Bài 5.1 Xây dựng một ứng dụng chuyển tiền tài khoản

Step 1: Tạo Database Banking

 Tạo bảng Accounts có các trường

 AccountNo: Nvarchar(10), Primary Key

 Balance: Numeric(20,2)

 Tạo 2 bản ghi bảng Accounts

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Step 2: Copy sqljdbc4.jar vào thư mục lib của server glassfish

Step 3: Tạo Connection Pool

 Netbean  Services  Servers  RC GlassFish Server  View Domain Admin Console

 Resources  JDBC  JDBC Connection Pools  New

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 Test Connection Pool BankingPool

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Step 4: Tạo JDBC Resources

Step 5: Tạo Enterprise Application

 File  New Project  Java EE  Enterprise Application

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Step 6: Tạo Stateless Session Bean trong package beanpack

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

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 AccountBean.java

package beanpack;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.logging.Level;

import java.util.logging.Logger;

import javax.annotation.PostConstruct;

import javax.annotation.Resource;

import javax.ejb.Stateless;

import javax.ejb.LocalBean;

import javax.ejb.TransactionManagement;

import javax.ejb.TransactionManagementType;

import javax.sql.DataSource;

import javax.transaction.SystemException;

import javax.transaction.UserTransaction;

/**

*

* @author Quang

*/

@Stateless

@LocalBean

@TransactionManagement(value = TransactionManagementType.BEAN)

public class AccountBean {

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//Khai bao Connection

private Connection conn;

//khai bao datasource

@Resource(mappedName = "jdbc/Banking")

private DataSource dataSource;

//Khai bao User Transaction

@Resource

private UserTransaction userTransaction;

//Phuong thuc khoi tao connection

@PostConstruct

public void initializeResources() {

System.out.println("PostConstruct callback");

try {

conn = dataSource.getConnection();

} catch (SQLException ex) {

Logger.getLogger(AccountBean.class.getName()).log(Level SEVERE, null, ex);

}

//Phuong thuc kiem tra so tai khoan co ton tai hay khoong

public boolean confirmAccount(String accountNo) {

//Khai bao bien kiem tra so tai khoan

boolean validAcc = false;

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

try {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT AccountNo FROM Accounts WHERE AccountNo = '" + accountNo +

"'");

if (rs.next()) {

validAcc = true;

}

rs.close();

} catch (SQLException ex) {

Logger.getLogger(AccountBean.class.getName()).log(Level SEVERE, null, ex);

throw new javax.ejb.EJBException(ex.getMessage());

}

return validAcc;

}

//Phuong thuc chuyen khoan

public void transferFund(String fromAcc, double balance, String toAacc) {

try {

userTransaction.begin();

if (confirmAccount(fromAcc) && confirmAccount(toAacc)) {

Statement stmt = null;

stmt = conn.createStatement();

//Tru tien tai khoan chuyen

stmt.executeUpdate("UPDATE Accounts SET Balance = Balance - " + balance + " WHERE AccountNo = '" + fromAcc + "'");

//Cong tien tai khoan duoc chuyen

stmt.executeUpdate("UPDATE Accounts SET Balance = Balance + " + balance + " WHERE AccountNo = '" + toAacc + "'");

userTransaction.commit();

} else {

throw new SQLException("Invalid Account Number");

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}

Step 7: Tạo trang PaymentForm.jsp

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

 PaymentForm.jsp

<%@ pagecontentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<title>Payment Form</title>

</head>

<body>

<h2>Payment Form</h2>

From Account Number: <input name="fromAcc" size="20" value=""/><br/>

Amount to be transferred: <input name="balance" size="20" value=""/><br/>

To Account Number: <input name="toAcc" size="20" value=""/><br/>

<hr>

</form>

</body>

</html>

Step 8: Tạo Servlet tên FundTransferServlet trong package servlet

 PaymentApplication-war  Source Packages  New  Other  Servlet

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 FundTransferServlet.java

package servlet;

import beanpack.AccountBean;

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;

/**

*

* @author Quang

*/

public class FundTransferServlet extends HttpServlet {

//goi Enterprise Session Bean

@EJB

private AccountBean accountBean;

/**

* Processes requests for both HTTP <code>GET</code> and <code>POST</code>

* methods

*

* @param request servlet request

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* @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 cac thong tin tren form

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

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

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

PrintWriter out = response.getWriter();

try {

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

out.println("<!DOCTYPE html>");

out.println("<html>");

out.println("<head>");

out.println("<title>Servlet FundTransferServlet</title>");

out.println("</head>");

out.println("<body>");

accountBean.transferFund(fromAcc, Double.valueOf(balance), toAcc);

out.println("<h2>Fund Transferred Succcessfully</h2>");

} catch (Exception ex) {

out.println("<h2>Error in transferring fund</h2>");

} finally {

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

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

out.close();

}

// <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)

throws ServletException, IOException {

processRequest(request, response);

}

/**

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

*

*/

@Override

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@Override

public String getServletInfo() {

return "Short description";

}// </editor-fold>

}

Step 9: Đặt PaymentForm.jsp làm trang home

 web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

<servlet-name>FundTransferServlet</servlet-name>

<servlet-class>servlet.FundTransferServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>FundTransferServlet</servlet-name>

<url-pattern>/FundTransferServlet</url-pattern>

</servlet-mapping>

<session-config>

<session-timeout>

30

</session-timeout>

</session-config>

<welcome-file-list>

<welcome-file>PaymentForm.jsp</welcome-file>

</welcome-file-list>

</web-app>

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 Ứng dụng sau khi hoàn thành

Step 10: Build and Run Application

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Định dạng
Số trang	15
Dung lượng	1,09 MB