一般 DAO是与Abstract Factory模式一起来用的...

Factory来建立数据库和定位具体的DAO(比如说是UserDao..CustomerDao..)..一般将getConnection设置为static..也可以把HibernateSessionFactory这一个公共类放在这一AbstractFactory类中去...
public class DAOFactory {
private static final SessionFactory sessionFacotory;
// 定义一个TrheadLocal .
static Session currentSession().....
public UserDao getUserDAO() { return new UserDaoImpl(sesssion); }
pulbic OtherDao getOtherDAO() { return new OtherDaoImpl(session); }
......
}
public interface UserDao {
public insertUser(FormBean)

public updateUser(FormBean);
}
然后就实现DAO的接口: (Struts的FormBean...VO来的..)

public class UserDaoImpl implements UserDao {
private Session session;
public UserDaoImpl(Session session){
this.session = session;
}...

(编辑:aniston)