struts2+hibernate+mysql实现注册登录

package cn.wk.dao; import java.util.List; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.cfg.Configuration; import cn.wk.bean.User; public class UserDao { // private static Session session; // private static Transaction transaction; // private static Query query; public static String insert(User user){ String message = "error"; Configuration cfg = new Configuration().configure(); SessionFactory factory = cfg.buildSessionFactory(); Session session = null; try { session = factory.openSession(); session.beginTransaction(); session.save(user); session.getTransaction().commit(); message = "success"; } catch (Exception e) { e.printStackTrace(); session.getTransaction().rollback(); }finally{ if (session != null) { if (session.isOpen()) { session.close(); } } } return message; } public static List<User> query(User user){ Configuration cfg = new Configuration().configure(); SessionFactory factory = cfg.buildSessionFactory(); Session session = null; Query query = null; String hql = "from User as u where u.username = ? and u.password = ?"; List<User> list = null; try { session = factory.openSession(); session.beginTransaction(); query = session.createQuery(hql); query.setParameter(0, user.getUsername()); query.setParameter(1, user.getPassword()); list = query.list(); session.getTransaction().commit(); session.close(); } catch (Exception e) { e.printStackTrace(); } return list; } }