EJB Session Bean Örnek

package com.farukbozan.ejb;import javax.ejb.Local;

@Local
public interface CalendarEJBLocal {

public int thisYear();
public int thisMonth();
public int thisDay();

}

package com.farukbozan.ejb;import java.util.Calendar;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.Stateless;
@Stateless
public class CalendarEJB implements CalendarEJBLocal {

private Calendar calendar;

@PostConstruct
public void initCalendar()
{
calendar = Calendar.getInstance();
System.out.println(“Calendar instance is initialized”);
}

@PreDestroy
public void closeCalendar()
{
calendar = null;
System.out.println(“Calendar instance is null”);
}

@Override
public int thisYear()
{
int year = calendar.get(Calendar.YEAR);
return year;
}

@Override
public int thisMonth()
{
int month = calendar.get(Calendar.MONTH);
return month;
}

@Override
public int thisDay()
{
int day = calendar.get(Calendar.DAY_OF_MONTH);
return day;
}

}

package com.farukbozan.ejb;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;
public class MainServlet extends HttpServlet {

@EJB
private CalendarEJBLocal calendarEJB;

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType(“text/html;charset=UTF-8”);
PrintWriter out = response.getWriter();
try {
out.println(“”);
out.println(“”);
out.println(“”);
out.println(“”);
out.println(calendarEJB.thisDay() + “.” + calendarEJB.thisMonth() + “.” + calendarEJB.thisYear());
out.println(“”);
out.println(“”);
} finally {
out.close();
}
}

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

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

}