EJB

[nandu]

Pgm1
======
import javax.ejb.EJBObject;
import java.rmi.RemoteException;

public interface Calculator extends EJBObject

{
public double dollarToRs(double dollars) throws RemoteException;
}

Pgm2
=====

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;

public class CalculatorClient extends JFrame

{
public static int w=500;
public static int h=95;
public static String str="Earnest bank Welocme You";
Container c;

JLabel l,result;
JTextField t;
JButton b;

public static String value;
public static double dbl;
public static double amt;

public CalculatorClient()
{
super(str);

c= getContentPane();
c.setLayout(new GridLayout(2,2,2,2));

l=new JLabel("Enter the amount in Dollars");
c.add(l);

t= new JTextField(10);
c.add(t);

b= new JButton("Calculate");
c.add(b);

result = new JLabel();
c.add(result);
value = t.getText();
b.addActionListener(new addEvent());
setSize(w,h);
show();
}
public class addEvent implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
value = t.getText();
dbl = Double.parseDouble(value);
try
{
Context ic= new InitialContext();
Object obj = ic.lookup("CalculatorJNDI");
CalculatorHome home =
(CalculatorHome)PortableRemoteObject.narrow(obj,CalculatorHome.class);
Calculator calc = home.create();
amt = calc.dollarToRs(dbl);
result.setText("Result(Rs.):"+String.valueOf(amt));
}
catch(Exception ex)
{
System.err.println("Caught as unexpected exception!");
ex.printStackTrace();
}
}
}

public static void main(String args[])
{
CalculatorClient m = new CalculatorClient();
}
}

Pgm3
======
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;

public class CalculatorEJB implements SessionBean
{
public double dollarToRs(double dollars)
{
return dollars*47.20;
}
public CalculatorEJB() {}
public void ejbCreate() {}
public void ejbRemove() {}
public void ejbActivate() {}
public void ejbPassivate() {}
public void setSessionContext(SessionContext sc) {}

}

Pgm4
========
import javax.ejb.EJBObject;
import java.io.Serializable;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
import java.rmi.RemoteException;

public interface CalculatorHome extends EJBObject

{
Calculator create() throws RemoteException,CreateException;
}