Hibernate 通用的添加实体方法

public void  addEntity(T entity){           Session session = null;           Transaction tx = null;           try{                    session = HibernateSessionFactory.getSession();                    tx = session.beginTransaction();                    session.save(entity);                    tx.commit();           }catch(HibernateException e){                    if(tx != null)                          tx.rollback();                    throw e;           }finally{                    if(session != null)                           session.close();           } }