J2EE Lab Manual [10mca46]

Department of MCA/Sir MVIT/Bangalore 1

J2EE LABORATORY [10MCA46]

J2EE Laboratory

Subject Code: 10MCA46 I.A Marks: 50

Hours/Week: 3 Exam Hours: 03

Total Hours: 42 Exam Marks: 50

1. Write a JAVA Program to insert data into Student DATA BASE and retrieve

info based on particular queries (queries can be given which covers all the

topics of 2nd UNIT).

2. Write a JAVA Servlet Program to implement a dynamic HTML using Servlet

(user name and password should be accepted using HTML and displayed using

a Servlet).

3. Write a JAVA Servlet Program to Download a file and display it on the screen

(A link has to be provided in HTML, when the link is clicked corresponding file

has to be displayed on Screen)

4. Write a JAVA Servlet Program to implement RequestDispatcher object (use

include() and forward() methods).

5. Write a JAVA Servlet Program to implement and demonstrate get() and Post

methods(Using HTTP Servlet Class).

6. Write a JAVA Servlet Program to implement sendRedirect() method(using

HTTP Servlet Class).

7. Write a JAVA Servlet Program to implement sessions (Using HTTP Session

Interface).

8. a. Write a JAVA JSP Program to print 10 even and 10 odd number.

b. Write a JAVA JSP Program to implement verification of a particular user

login and display a welcome page.

9. Write a JAVA JSP Program to get student information through a HTML and

create a JAVA Bean Class, populate Bean and display the same information

through another JSP.

10. Write a JAVA JSP Program which uses <jsp:plugin> tag to run a applet.

11. Write a JAVA JSP Program whch implements nested tags and also uses

TagSupport Class.

12. An EJB application that demonstrates Session Bean.

13. An EJB application that demonstrates Entity Bean.

14. An EJB application that demonstrates MDB.



1. Write a JAVA Program to insert data into Student DATA BASE and

retrieve info based on particular queries (queries can be given which

covers all the topics of 2nd UNIT).

SOURCE CODE:

JDBCDemo.java

import java.sql.*;

import java.io.*;

class JDBCDemo

{

public static void main(String args[])

{

Connection con=null;

Statement st=null;

PreparedStatement pst=null;

ResultSet rs=null;

String str=null;

try

{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

con=DriverManager.getConnection("jdbc:odbc:vas","","");

}

catch(ClassNotFoundException e)

{

System.out.println("\nUnable to load JDBC/ODBC Bridge Driver"+e);

System.exit(1);

}

catch(SQLException e)

{

System.out.println("Cannot able to connect with database"+e);

}

try

{

BufferedReader bufRead = new BufferedReader(new InputStreamReader(System.in))

;

while(true)

{

try{

System.out.println("\nSTUDENT INFORMATION MANAGEMENT SYSTEM");

System.out.println("\n1.Insert Info \n2.Query \n3.Updation \n4.Exit");

System.out.print("\nEnter your choice : ");

int ch=Integer.parseInt(bufRead.readLine());

switch(ch)

{

case 1: System.out.println("\nEnter the student usn, name, branch,age and

percentage\n");

String usn=bufRead.readLine();

String name=bufRead.readLine();

String branch=bufRead.readLine();

int age=Integer.parseInt(bufRead.readLine());



float per=Float.parseFloat(bufRead.readLine());

pst=con.prepareStatement("insert into student values(?,?,?,?,?)");

pst.setString(1,usn);

pst.setString(2,name);

pst.setString(3,branch);

pst.setInt(4,age);

pst.setFloat(5,per);

pst.execute();

break;

case 2: System.out.println("\nEnter the query to be executed\n");

str=bufRead.readLine();

st=con.createStatement();

rs=st.executeQuery(str);

ResultSetMetaData rmd=rs.getMetaData();

int col=rmd.getColumnCount();

int count=1;

boolean b=rs.next();

if(!b)

{

System.out.println("No Data Found");

}

else

{

do

{

System.out.print("RECORD " +(count++)+" => ");

for(int i=0;i<col;i++)

System.out.print(rs.getString(i+1)+"\t");

System.out.println();

}while(rs.next());

}

break;

case 3: System.out.println("\nEnter the query for updation");

str=bufRead.readLine();

st=con.createStatement();

int r=st.executeUpdate(str);

if(r==0)

System.out.println("\nNo rows Updated");

else

System.out.println("\nYour upddation has been done successfully");

break;

case 4: con.close();

System.exit(0);

break;

}

}

catch(SQLException e)

{

System.out.println(e);

}

catch(Exception e)

{




}

}

}

catch(Exception e)

{


}

}

}

OUTPUT





2. WRITE A JAVA SERVLET PROGRAM TO IMPLEMENT A DYNAMIC

HTML USING SERVLET (USER NAME AND PASSWORD SHOULD BE ACCEPTED USING HTML AND DISPLAYED USING A SERVLET).

SOURCE CODE:

Login.html

<html>

<head>

<title>Login Page</title>

</head>

<body>

<center><h1>Login Page</h1></center>

<b>Please enter your username and password

<form action="Login" method="POST">

<p><b>Username :<input type="text" name="username" length=40>

<p><b>Password :<input type="password" name="pass" length=40>

<p> <input type="submit" value="Submit">

</form>

</body>

</html>

Login.java

import javax.servlet.http.*;

import java.io.*;

public class Login extends HttpServlet

{

public void doPost(HttpServletRequest request,HttpServletResponse response)

{

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

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

try

{

response.setContentType("text/html");

PrintWriter writer=response.getWriter();

writer.println("<html><body>");

writer.println("<h4>Thank you, "+username+".You are now logged into the

system.</h4>");

writer.println("<br><B>User Information");

writer.println("<br><br><B>UserName: "+username);

writer.println("<br><B>Password: "+pass);

writer.println("</body></html>");

writer.close();

}catch(Exception e){

e.printStackTrace();

}

}

}



OUTPUT



3. WRITE A JAVA SERVLET PROGRAM TO DOWNLOAD A FILE AND

DISPLAY IT ON THE SCREEN (A LINK HAS TO BE PROVIDED IN HTML, WHEN THE LINK IS CLICKED CORRESPONDING FILE HAS

TO BE DISPLAYED ON SCREEN)

SOURCE CODE:

Download.html

<html>

<body>

<h1>The SQL Tutorial</h1>

<h3>

<a href="http://localhost:8080/PROG3/DownloadServlet">Click here

to Learn SQL</a>

</h3>

</body>

</html>

DownloadServlet.java


import javax.servlet.*;

import java.io.*;

public class DownloadServlet extends HttpServlet

{

public void doGet(HttpServletRequest request,HttpServletResponse

response)throws IOException,ServletException

{

response.setContentType("application/msword");

response.setHeader("Content-

Disposition","attachment;filename=SQL.doc");

ServletOutputStream output=response.getOutputStream();

FileInputStream file=new FileInputStream("F:\\SQL.doc");

int c=0;

while((c=file.read())!=-1)

{

output.write(c);

}

output.flush(); output.close(); file.close();

}

}



OUTPUT



4. WRITE A JAVA SERVLET PROGRAM TO IMPLEMENT

REQUESTDISPATCHER OBJECT (USE include() AND forward() METHODS).

SOURCE CODE:

IFDemo.html

<html>

<head>

<title>include and forward Demo</title>

</head>

<body>

<center><h1>include forward Demo</h1></center>

<b>Please enter mode of operation

<form action="/PROG4/IFDemo">

<p><input type="text" name="mode" length=40>

<p> <input type="submit" value="Submit">

<input type="reset" value="Clear">

</form>

</body>

</html>

IFDemo.java



import java.io.*;

public class IFDemo extends HttpServlet

{

public void doGet(HttpServletRequest request,HttpServletResponse response)

{

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

try

{


PrintWriter out = response.getWriter();

RequestDispatcher rd=null;

if(mode.equals("forward"))

{

request.setAttribute("mode","Forward Response....");

rd=request.getRequestDispatcher("ForwardDemo");

rd.forward(request,response);

}

else if(mode.equals("include"))

{

request.setAttribute("mode","Include Response...");

out.println("<html>");

out.println("<head>");

out.println("<title>Includes Demo</title>");

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



out.println("<body>");

out.println("<h1>Hello from Level 1</h1>");

out.println("This text is displayed at Level 1.");

rd = request.getRequestDispatcher("IncludeDemo");

rd.include(request, response);

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

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

out.close();

}

else

{

out.println("<h3> Enter only include or forward</h3>");

out.close();

}



}

}

}

ForwardDemo.java


import java.io.*;

public class ForwardDemo extends HttpServlet

{


{

try

{



String mode=(String)request.getAttribute("mode");

writer.println("Another doGet ");

writer.println(mode);

writer.close();



}

}

}

IncludeDemo.java


import java.io.*;

public class IncludeDemo extends HttpServlet

{


{

try

{





String mode=(String)request.getAttribute("mode");

writer.println("<br><b>This is another text of "+mode);

writer.close();


e.printStackTrace(); }

}

}

OUTPUT





5. WRITE A JAVA SERVLET PROGRAM TO IMPLEMENT AND

DEMONSTRATE GET AND POST METHODS(USING HTTP SERVLET CLASS).

SOURCE CODE:

Get.html

<html><head><title>Demonstration of Get and Post Method</title><head>

<body bgcolor="pink">

<center>

<form action="http://localhost:8080/PROG5/getpost">

<p><b>Press submit button to call Get method</b></p><br>

<B>color:</B>

<select name="color"size="1">

<option value="red">red</option>

<option value="green">green</option>

<option value="blue">blue</option>

</select>

<br><br>

<input type=submit value="submit">

</form>

</body></html>

Post.html

<html><head><title>Demonstration of Get and Post Method</title><head>

<body bgcolor="pink">

<center>

<form action="http://localhost:8080/PROG5/getpost" method="post">

<p><b>Press submit button to call Post method</b></p><br>

<B>color:</B>

<select name="color"size="1">

<option value="red">red</option>

<option value="green">green</option>

<option value="blue">blue</option>

</select>

<br><br>

<input type=submit value="submit">

</form>

</body>

</html>

getpost.java

import java.io.*;



public class getpost extends HttpServlet

{

public void doPost(HttpServletRequest request, HttpServletResponse response)



throws ServletException,IOException

{

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


PrintWriter pw=response.getWriter();

pw.println("<b>Hello from Post method</b><br><br>");

pw.println("You have selected" + " " + color + " " + "color");

pw.close();

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException,IOException

{

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


PrintWriter pw=response.getWriter();

pw.println("<b>Hello from Get method</b><br><br>");

pw.println("You have selected" + " " + color + " " + "color");

pw.close();

}

}

OUTPUT





6. WRITE A JAVA SERVLET PROGRAM TO IMPLEMENT sendRedirect()

METHOD(USING HTTP SERVLET CLASS).

SOURCE CODE

SendRedirect.html

<html>

<head>

<title>Redirecting the page</title>

</head>

<body>

<form action = "SendRedirect" method = "post">

<b>Enter your name -----:

<input type = "text" name = "username"><br>

<b>Enter your password :

<input type = "password" name = "password"><br>

<input type = "submit" value = "SUBMIT">

<input type = "reset" value = "RESET">

</form>

</body>

</html>

SendRedirect.java



import java.io.*;

public class SendRedirect extends HttpServlet

{

public void doPost(HttpServletRequest request, HttpServletResponse

response) throws ServletException, IOException

{


PrintWriter pw = response.getWriter();

String name = request.getParameter("username");

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

if(name.equals("vit") && password.equals("vit"))

{

response.sendRedirect("ValidUser");

}

else

{

pw.println("<h3>Invalid UserName or Password ....");

}

}

}

ValidUser.java



import java.io.*;

public class ValidUser extends HttpServlet

{



public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{


PrintWriter pw = response.getWriter();

pw.println("<center><h1>Welcome to Sir MVIT Home

Page</h1></center>");

pw.close();

}

}

OUTPUT



7. WRITE A JAVA SERVLET PROGRAM TO IMPLEMENT SESSIONS

(USING HTTP SESSION INTERFACE).

SOURCE CODE

ShowSession.java

import java.io.*;



public class ShowSession extends HttpServlet

{

public void doGet(HttpServletRequest req,HttpServletResponse res)throws

ServletException,IOException

{

res.setContentType("text/html");

PrintWriter pw=res.getWriter();

String title="Session Tracking Example";

HttpSession session=req.getSession(true);

String heading;

Integer ac=(Integer)session.getAttribute("ac");

if(ac==null)

{

ac=new Integer(0);

heading ="welcome,Newcomer";

}

else

{

heading="Welcome back";

ac=new Integer(ac.intValue()+1);

}

session.setAttribute("ac",ac);

pw.println("<html><head><title>"+title+"</title></head>");

pw.println(heading+"<br>");

pw.println("sessionID = "+session.getId()+"<br>");

pw.println("ac = "+ac+"<br>");

pw.close();

}

}



OUTPUT



8. a. WRITE A JAVA JSP PROGRAM TO PRINT 10 EVEN AND 10 ODD

NUMBER.

SOURCE CODE

EvenOdd.jsp

<html>

<head>

<title>

JSP Program

</title>

</head>

<body>

<br>

<h1>Ten Odd Numbers</h1><br>

<%

for(int i=1;i<=20;i++)

if(i%2!=0)

{

%>

<b><font size="4"><%=i%></font></b>

<%

}

%>

<br><br>

<h1>Ten Even Numbers</h1><br>

<%

for(int i=1;i<=20;i++)

if(i%2==0)

{

%>

<b><font size="4"><%=i%></font></b>

<%

}

%>

</body>

</html>



OUTPUT



B. WRITE A JAVA JSP PROGRAM TO IMPLEMENT VERIFICATION OF

A PARTICULAR USER LOGIN AND DISPLAY A WELCOME PAGE.

SOURCE CODE

Login.jsp

<html>

<head>


</head>

<body bgcolor="#fffff">

<form action="Validation.jsp">

<table border="0">

<tr>

<td>

User id :</td><td><input type="text" name="uname"/><br>

</td>

</tr>

<tr>

<td>

password :</td><td><input type="password" name="password"/><br>

</td>

</tr>

<tr>

<td align="center">

<input type="submit" value="submit">

<input type="reset" value="reset">

</td>

</tr>

</table>

</form>

</body>

</html>

Validation.jsp

<html>

<body>

<%! String uid="vas";%>

<%! String pass="mvit";%>

<%! String id,password; %>

<% id=request.getParameter("uname"); %>

<% password=request.getParameter("password"); %>

<%

if(uid.equals(id) && pass.equals(password))

{

%>

<jsp:forward page="Welcome.jsp"/>

<% }

else {

%>

<jsp:forward page="Error.jsp"/>



<% }

%>

</body>

</html>

Welcome.jsp

<body><center><h1> Welcome to Home Page</h1></center></body>

Error.jsp

<body> <h1>Invalid Entry ....</h1>

<a href="http://localhost:8080/PROG8B/">< BACK</a>

</body>



OUTPUT



9. WRITE A JAVA JSP PROGRAM TO GET STUDENT INFORMATION

THROUGH A HTML AND CREATE A JAVA BEAN CLASS, POPULATE BEAN AND DISPLAY THE SAME INFORMATION THROUGH

ANOTHER JSP.

SOURCE CODE

Registration.html

<html>

<head>

<title>Registration Page</title>

</head>

<body>

<h1>Registration Page</h1>

<form action="StuInfo.jsp" method="post">

<table>

<tr>

<td align="right">First name : </td>

<td align="left"><input type="text" name="firstName" length="30"

/></td>

</tr>

<tr>

<td align="right">Surname :</td>

<td align="left"><input type="text" name="surname" length="30"

/></td>

</tr>

<tr>

<td align="right">USN :</td>

<td align="left"><input type="text" name="usn" length="30"

/></td>

</tr>

<tr>

<td align="right">Course :</td>

<td align="left"><input type="text" name="course" length="30"

/></td>

</tr>

<tr>

<td align="right">Sem :</td>

<td align="left"><input type="text" name="sem" length="30"

/></td>

</tr>

<tr>

<td align="right">Age :</td>

<td align="left"><input type="text" name="age" length="30"

/></td>

</tr>

<tr>

<td align="right">Address :</td>

<td align="left"><input type="text" name="address" length="30"

/></td>



</tr>

</table>

<p><input type="submit" value="Submit"/>

<input type="reset" value="Reset"/></p>

</form>

</body>

</html>

StuInfo.jsp

<html>

<head>

<title>Register User</title>

</head>

<body>

<jsp:useBean id="stud" scope="session" class="mvit.Student">

<jsp:setProperty name="stud" property="*"/>

</jsp:useBean>

<h3>These are the values you submitted </h3>

<p>Your first name is <%= stud.getFirstName() %>.</p>

<p>Your last name is

<jsp:getProperty name="stud" property="surname"/>.</p>

<p>Your user USN is

<jsp:getProperty name="stud" property="usn"/>.</p>

<p>Your Selected Course is

<jsp:getProperty name="stud" property="course"/>.</p>

<p>Your Sem is

<jsp:getProperty name="stud" property="sem"/>.</p>

<p>Your age is

<jsp:getProperty name="stud" property="age"/>.</p>

<p>Your Address is

<jsp:getProperty name="stud" property="address"/>.</p>

</body>

</html>

Student.java

package mvit;

public class Student

{

private String firstName;

private String surname;

private String usn;

private String course;

private int sem;

private int age;

private String address;

private long contact;

public String getFirstName()

{



return firstName;

}

public void setFirstName(String newFirstName)

{ this.firstName=newFirstName;

}

public String getSurname()

{ return surname; }

public void setSurname(String newSurName)

{

this.surname=newSurName;

}

public String getUsn()

{

return usn;

}

public void setUsn(String newUsn)

{ this.usn=newUsn;

}

public String getCourse()

{

return course;

}

public void setCourse(String newCourse)

{ this.course=newCourse;

}

public int getAge()

{ return age; }

public void setAge(int newAge)

{

this.age=newAge;

}

public int getSem()

{ return sem; }

public void setSem(int newSem)

{

this.sem=newSem;

}

public String getAddress()

{

return address;

}

public void setAddress(String newAddress){ this.address=newAddress;

}}



OUTPUT



10. WRITE A JAVA JSP PROGRAM WHICH USES <JSP:PLUGIN> TAG TO

RUN A APPLET.

SOURCE CODE

AppJsp.jsp

<%@ page language="java" %>

<html>

<head>

<title>Welcome JSP-Applet Page</title>

</head>

<body>

<jsp:plugin type="applet" code="AppJspDemo.class" width="400" height="400">

<jsp:fallback>

<p>Unable to load applet</p>

</jsp:fallback>

</jsp:plugin>

</body>

</html>

AppJspDemo.java

import java.io.*;

import java.awt.*;

import java.util.*;

import java.applet.*;

import java.awt.event.*;

public class AppJspDemo extends Applet {

public void init() {

setBackground(Color.blue);

setForeground(Color.yellow);

}

public void paint(Graphics g){

g.drawString("Welcome JSP-Applet",100,100);

}

}



OUTPUT



11. WRITE A JAVA JSP PROGRAM WHCH IMPLEMENTS NESTED TAGS

AND ALSO USES TAGSUPPORT CLASS.

SOURCE CODE

Nested.jsp

<%@taglib uri="/WEB-INF/tlds/nested.tld" prefix="mine"%>

<mine:nest>

<mine:nest>

<mine:nest/>

</mine:nest>

</mine:nest>

Nested.tld

<taglib>

<tlib-version>1.0</tlib-version>

<jsp-version>1.2</jsp-version>

<short-name>mine</short-name>

<description>simple library.Author Rod Johnson</description>

<tag>

<name>nest</name>

<tag-class>com.NestedLevelTag</tag-class>

<body-content>JSP</body-content>

<description>

Hi

</description>

</tag>

</taglib>

NestedLevelTag.java

package com;

import java.io.IOException;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.Tag;

import javax.servlet.jsp.tagext.TagSupport;

public class NestedLevelTag extends TagSupport{

private int nestLevel=0;

public int doStartTag() throws JspException {

nestLevel=0;

Tag parent=getParent();

while(parent!=null)

{

parent=parent.getParent();

nestLevel++;

}

try{

pageContext.getOut().println("<br> Tag nested level: "+nestLevel);



}

catch(IOException e)

{

throw new JspException("IOException -"+e.toString());

}

return EVAL_BODY_INCLUDE;

}

}

OUTPUT



12. AN EJB APPLICATION THAT DEMONSTRATES SESSION BEAN.

SOURCE CODE:

CallServlet.html

<html>

<head>


</head>

<body>

<h1>Arithmetic Operation</h1>

<form action="CallSession" method="POST">

<p><b>Enter value for A :<input type="text"

name="num1"/></b></p>

<p><b>Enter value for B :<input type="text"

name="num2"/></b></p>

<p><b><input type="submit" value="Perform Operation"></b></p>

</form>

</body>

</html>

CallSession.java

package com;


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;

public class CallSession extends HttpServlet {

@EJB

private SessionBeanDemoLocal sessionBeanDemo;

protected void processRequest(HttpServletRequest request, HttpServletResponse

response)

throws ServletException, IOException {

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


int a,b;

a=Integer.parseInt(request.getParameter("num1"));

b= Integer.parseInt(request.getParameter("num2"));

try {





out.println("<title>Arithmetic Operation</title>");



out.println("<h1>Arithmetic Operation</h1>");

out.println("<h2>A = "+a+" B= "+b+"</h2>");

out.println("<pre><h2>Addition(A+B) = " +

sessionBeanDemo.add(a,b) + "</h2>");

out.println("<h2>Subtraction(A-B) = " + sessionBeanDemo.sub(a, b) +

"</h2>");

out.println("<h2>Multiplication(A*B) = " + sessionBeanDemo.mul(a, b) +

"</h2>");

out.println("<h2>Division(A/B) = " + sessionBeanDemo.div(a, b) +

"</h2></pre>");



} finally {

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.

*

* @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)


processRequest(request, response);

}

/**

* Handles the HTTP

* <code>POST</code> method.

*





*/

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse

response)



}



/**

* Returns a short description of the servlet.

*

* @return a String containing servlet description

*/

@Override

public String getServletInfo() {

return "Short description";

}// </editor-fold>

}

SessionBeanDemo.java

package com;

import javax.ejb.Stateless;

/**

*

* @author VASANTH

*/

@Stateless

public class SessionBeanDemo implements SessionBeanDemoLocal {

@Override

public int add(int a, int b) {

return a+b;

}

@Override

public int sub(int a, int b) {

return a-b;

}

@Override

public int mul(int a, int b) {

return a*b;

}

@Override

public int div(int a, int b) {

return a/b;

}

}



SessionBeanDemoLocal.java

package com;

import javax.ejb.Local;

@Local

public interface SessionBeanDemoLocal {

int add(int a, int b);

int sub(int a, int b);

int mul(int a, int b);

int div(int a, int b);

}



OUTPUT



13. AN EJB APPLICATION THAT DEMONSTRATES ENTITY BEAN.

SOURCE CODE:

CallServlet.html

<html>

<head>


</head>

<body>

<h1>ENTER STUDENT INFORMATION </h1>

<form action="CallEntity" method="POST">

<p><b>USN ---------- :<input type="text" name="usn"/></b></p>

<p><b>NAME ------ :<input type="text" name="name"/></b></p>

<p><b>BRANCH -- :<input type="text" name="course"/></b></p>

<p><b><input type="submit" value="Insert Student

Info"></b></p>

</form>

</body>

</html>

CallEntity.java

package com;


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;

public class CallEntity extends HttpServlet {

@EJB

private StudentFacadeLocal studentFacade;

protected void processRequest(HttpServletRequest request, HttpServletResponse

response)


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


String usn,name,course;

usn=request.getParameter("usn");

name=request.getParameter("name");

course=request.getParameter("course");

studentFacade.addStu(usn,name,course);

try {





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



out.println("<h1>Student record sucessfully stored ....</h1>");



} finally {

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)



}

/**

* Handles the HTTP

* <code>POST</code> method.

*





*/

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse

response)



}

/**

* Returns a short description of the servlet.

*

* @return a String containing servlet description

*/

@Override

public String getServletInfo() {

return "Short description";



}// </editor-fold>

}

Student.java

package com;

import java.io.Serializable;

import javax.persistence.*;

import javax.validation.constraints.NotNull;

import javax.validation.constraints.Size;

import javax.xml.bind.annotation.XmlRootElement;

@Entity

@Table(name = "STUDENT")

@XmlRootElement

@NamedQueries({

@NamedQuery(name = "Student.findAll", query = "SELECT s FROM Student s"),

@NamedQuery(name = "Student.findByUsn", query = "SELECT s FROM Student s

WHERE s.usn = :usn"),

@NamedQuery(name = "Student.findByName", query = "SELECT s FROM Student

s WHERE s.name = :name"),

@NamedQuery(name = "Student.findByCourse", query = "SELECT s FROM

Student s WHERE s.course = :course")})

public class Student implements Serializable {

private static final long serialVersionUID = 1L;

@Id

@Basic(optional = false)

@NotNull

@Size(min = 1, max = 20)

@Column(name = "USN")

private String usn;

@Size(max = 20)

@Column(name = "NAME")

private String name;

@Size(max = 20)

@Column(name = "COURSE")

private String course;

public Student() {

}

public Student(String usn) {

this.usn = usn;

}

public String getUsn() {

return usn;

}

public void setUsn(String usn) {

this.usn = usn;

}



public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getCourse() {

return course;

}

public void setCourse(String course) {

this.course = course;

}

@Override

public int hashCode() {

int hash = 0;

hash += (usn != null ? usn.hashCode() : 0);

return hash;

}

@Override

public boolean equals(Object object) {

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

if (!(object instanceof Student)) {

return false;

}

Student other = (Student) object;

if ((this.usn == null && other.usn != null) || (this.usn != null &&

!this.usn.equals(other.usn))) {

return false;

}

return true;

}

@Override

public String toString() {

return "com.Student[ usn=" + usn + " ]";

}

}

StudentFacade.java

package com;

import javax.ejb.Stateless;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;



@Stateless

public class StudentFacade extends AbstractFacade<Student> implements

StudentFacadeLocal {

@PersistenceContext(unitName = "EntityBeanDemo-ejbPU")

private EntityManager em;

@Override

protected EntityManager getEntityManager() {

return em;

}

public StudentFacade() {

super(Student.class);

}

@Override

public void persist(Object object) {

em.persist(object);

}

@Override

public void addStu(String usn, String name, String course) {

Student obj=new Student();

obj.setUsn(usn);

obj.setName(name);

obj.setCourse(course);

persist(obj);

}

}

StudentFacadeLocal.java

package com;

import java.util.List;

import javax.ejb.Local;

@Local

public interface StudentFacadeLocal {

void create(Student student);

void edit(Student student);

void remove(Student student);

Student find(Object id);

List<Student> findAll();

List<Student> findRange(int[] range);



int count();

void addStu(String usn, String name, String course);

public void persist(java.lang.Object object);

}

AbstractFacade.java

package com;

import java.util.List;

import javax.persistence.EntityManager;

public abstract class AbstractFacade<T> {

private Class<T> entityClass;

public AbstractFacade(Class<T> entityClass) {

this.entityClass = entityClass;

}

protected abstract EntityManager getEntityManager();

public void create(T entity) {

getEntityManager().persist(entity);

}

public void edit(T entity) {

getEntityManager().merge(entity);

}

public void remove(T entity) {

getEntityManager().remove(getEntityManager().merge(entity));

}

public T find(Object id) {

return getEntityManager().find(entityClass, id);

}

public List<T> findAll() {

javax.persistence.criteria.CriteriaQuery cq =

getEntityManager().getCriteriaBuilder().createQuery();

cq.select(cq.from(entityClass));

return getEntityManager().createQuery(cq).getResultList();

}

public List<T> findRange(int[] range) {



cq.select(cq.from(entityClass));

javax.persistence.Query q = getEntityManager().createQuery(cq);



q.setMaxResults(range[1] - range[0]);

q.setFirstResult(range[0]);

return q.getResultList();

}

public int count() {



javax.persistence.criteria.Root<T> rt = cq.from(entityClass);

cq.select(getEntityManager().getCriteriaBuilder().count(rt));

javax.persistence.Query q = getEntityManager().createQuery(cq);

return ((Long) q.getSingleResult()).intValue();

}

}

OUTPUT





14. AN EJB APPLICATION THAT DEMONSTRATES MDB.

SOURCE CODE:

HelloBean.java

package hello; 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; /** * * @author VASANTH */ @MessageDriven(mappedName = "jms/hello", activationConfig = { @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"), @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue") }) public class HelloBean implements MessageListener { public HelloBean() { } @Override public void onMessage(Message message) { try { System.out.println("Hello "+message.getStringProperty("name")); } catch (JMSException ex) { Logger.getLogger(HelloBean.class.getName()).log(Level.SEVERE, null, ex); } } } Main.java /* * To change this template, choose Tools | Templates * and open the template in the editor. */ package mdbclient;



import javax.annotation.Resource; import javax.jms.*; /** * * @author VASANTH */ public class Main { @Resource(mappedName = "jms/hello") private static Queue hello; @Resource(mappedName = "jms/helloFactory") private static ConnectionFactory helloFactory; /** * @param args the command line arguments */ public static void main(String[] args) throws JMSException { // TODO code application logic here Connection connection = helloFactory.createConnection(); Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); MessageProducer messageProducer = session.createProducer(hello); Message message=session.createMessage(); message.setStringProperty("name", "Vikram"); messageProducer.send(message); System.exit(0); } } OUTPUT

Documents

J2EE Lab Manual [10mca46]