网上投票调查系统，servlet+javabean+jsp

package net.survey.dao; import java.util.List; import net.survey.model.User; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.LockMode; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.Transaction; import org.hibernate.criterion.Example; /** * A data access object (DAO) providing persistence and search support for User * entities. Transaction control of the save(), update() and delete() operations * can directly support Spring container-managed transactions or they can be * augmented to handle user-managed Spring transactions. Each of these methods * provides additional information for how to configure it for the desired type * of transaction control. * * @see net.survey.model.User * @author MyEclipse Persistence Tools */ public class UserDAO extends BaseHibernateDAO { private static final Log log = LogFactory.getLog(UserDAO.class); // property constants public static final String USERNAME = "username"; public static final String PASSWORD = "password"; public static final String NICK_NAME = "nickName"; public static final String EMAIL = "email"; public static final String SEX = "sex"; public static final String DEPT = "dept"; public static final String ROLE = "role"; public void save(User transientInstance) { log.debug("saving User instance"); Session session = getSession(); Transaction t = session.beginTransaction(); try { session.save(transientInstance); log.debug("save successful"); t.commit(); } catch (RuntimeException re) { log.error("save failed", re); if (t != null) { t.rollback(); } throw re; } finally { session.close(); } } public void delete(User persistentInstance) { log.debug("deleting User instance"); try { getSession().delete(persistentInstance); log.debug("delete successful"); } catch (RuntimeException re) { log.error("delete failed", re); throw re; } } public User findById(java.lang.Integer id) { log.debug("getting User instance with id: " + id); Session session = getSession(); Transaction t = session.beginTransaction(); try { User instance = (User) getSession() .get("net.survey.model.User", id); t.commit(); return instance; } catch (RuntimeException re) { log.error("get failed", re); if (t != null) { t.rollback(); } throw re; }finally { session.close(); } } public List findByExample(User instance) { log.debug("finding User instance by example"); try { List results = getSession().createCriteria("net.survey.model.User") .add(Example.create(instance)).list(); log.debug("find by example successful, result size: " + results.size()); return results; } catch (RuntimeException re) { log.error("find by example failed", re); throw re; } } public List findByProperty(String propertyName, Object value) { log.debug("finding User instance with property: " + propertyName + ", value: " + value); Session session = getSession(); Transaction t = session.beginTransaction(); try { String queryString = "from User as model where model." + propertyName + "= ?"; Query queryObject = getSession().createQuery(queryString); queryObject.setParameter(0, value); t.commit(); return queryObject.list(); } catch (RuntimeException re) { log.error("find by property name failed", re); if (t != null) { t.rollback(); } throw re; } finally { session.close(); } } public List findByUsername(Object username) { return findByProperty(USERNAME, username); } public List findByPasword(Object pasword) { return findByProperty(PASSWORD, pasword); } public List findByNickName(Object nickName) { return findByProperty(NICK_NAME, nickName); } public List findByEmail(Object email) { return findByProperty(EMAIL, email); } public List findBySex(Object sex) { return findByProperty(SEX, sex); } public List findByDept(Object dept) { return findByProperty(DEPT, dept); } public List findByRole(Object role) { return findByProperty(ROLE, role); } public List findAll() { log.debug("finding all User instances"); Session session = getSession(); Transaction t = session.beginTransaction(); try { String queryString = "from User"; Query queryObject = getSession().createQuery(queryString); t.commit(); return queryObject.list(); } catch (RuntimeException re) { log.error("find all failed", re); if (t != null) { t.rollback(); } throw re; }finally { session.close(); } } public User merge(User detachedInstance) { log.debug("merging User instance"); try { User result = (User) getSession().merge(detachedInstance); log.debug("merge successful"); return result; } catch (RuntimeException re) { log.error("merge failed", re); throw re; } } public void attachDirty(User instance) { log.debug("attaching dirty User instance"); Session session = getSession(); Transaction t = session.beginTransaction(); try { getSession().saveOrUpdate(instance); t.commit(); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); if (t != null) { t.rollback(); } throw re; }finally { session.close(); } } public void attachClean(User instance) { log.debug("attaching clean User instance"); try { getSession().lock(instance, LockMode.NONE); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public User login(String username, String password) { User user = null; Session session = getSession(); Transaction t = session.beginTransaction(); try { String queryString = "from User where username='" + username + "' and password='" + password + "'"; Query queryObject = getSession().createQuery(queryString); if (queryObject.list().size() != 0) { user = (User) queryObject.list().get(0); } } catch (RuntimeException re) { log.error("merge failed", re); if (t != null) { t.rollback(); } throw re; } finally { session.close(); } return user; } }