如何在Struts2 + Hibernate Web App中跨多个dao方法使用同一会话对象?

为了简单起见，我在下面的代码中省略了许多细节.
我的实现正确吗?
此实现有任何弊端吗?
有没有更好的方法来实现呢?

I have omitted many details from the code below just to keep it simple.
Is my implementation right?
Is there any downside of this implementation?
Is there a better way of implementing the same?

MyAction.java

class MyAction {
  public String execute() {
    Session session = sessionFactory.openSession();
    Transaction tx = session.beginTransaction();

    try {

      UserLoginDAO uldao = new UserLoginDAOImpl();
      uldao.firstMethod(session);
      List l = uldao.secondMethod(session);
      tx.commit();

    } catch(HibernateException ex) {
      if(tx != null) tx.rollback();
    } finally {
      session.close();
    }
    //statements
  }
}

UserLoginDAOImpl.java

class UserLoginDAOImpl implements UserLoginDAO{
  public void firstMethod(session) {
    //statements
    session.save(something);
  }

  public List secondMethod(session) {
    //statements
    List lst = session.createQuery("something").list(); 
    //statements
  }
}

UserLoginDAO.java

interface UserLoginDAO {
  public void firstMethod(session);
  public List secondMethod(session);
}