Home介面

EJBHome:負責建立遠端EJB物件(即實現了EJBObject介面的Remote物件)

public interface HaiRemoteHome extends EJBHome
{
    HaiRemote create() throws RemoteException, CreateException;
}
 

EJBLocalHome：負責建立本地EJB物件(即實現了EJBLocalObject介面的Remote物件)

Remote介面:裡面定義我們的業務方法

EJBObject : 僅用於遠端呼叫的業務介面

public interface HaiRemote extends EJBObject
{
    String sayHai() throws RemoteException;
}

EJBLocalObject : 僅用於本地呼叫的業務介面

SessionBean

會話bean：定義Bean的生命週期方法和實現Remote介面中定義的方法

public class HaiBean implements SessionBean
{
    public void setSessionContext(SessionContext arg0) throws EJBException, RemoteException
    {
        System.out.println("set session context");
    }
    
    public void ejbCreate() throws EJBException
    {
        System.out.println("ejb create");
    }

    public void ejbRemove() throws EJBException, RemoteException
    {
        System.out.println("ejb remove");
    }

    public void ejbActivate() throws EJBException, RemoteException
    {
        System.out.println("ejb activate");
    }

    public void ejbPassivate() throws EJBException, RemoteException
    {
        System.out.println("ejb passivate");
    }

    public String sayHai() throws RemoteException
    {
        return "Hai, EJB 2!";
    }
}