用java中的ssh三大框架做的一个入门的例子

package stu.dao; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.LockMode; import org.springframework.context.ApplicationContext; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; import stu.entity.Student; /** * Data access object (DAO) for domain model class Student. * * @see stu.entity.Student * @author MyEclipse Persistence Tools */ public class StudentDAO extends HibernateDaoSupport { private static final Log log = LogFactory.getLog(StudentDAO.class); // property constants public static final String NAME = "name"; public static final String AGE = "age"; protected void initDao() { // do nothing } public void save(Student transientInstance) { log.debug("saving Student instance"); try { getHibernateTemplate().save(transientInstance); log.debug("save successful"); } catch (RuntimeException re) { log.error("save failed", re); throw re; } } public void delete(Student persistentInstance) { log.debug("deleting Student instance"); try { getHibernateTemplate().delete(persistentInstance); log.debug("delete successful"); } catch (RuntimeException re) { log.error("delete failed", re); throw re; } } //修改 public void update(Student student) { super.getHibernateTemplate().update(student); } public Student findById(java.lang.Integer id) { log.debug("getting Student instance with id: " + id); try { Student instance = (Student) getHibernateTemplate().get( "stu.entity.Student", id); return instance; } catch (RuntimeException re) { log.error("get failed", re); throw re; } } public List findByExample(Student instance) { log.debug("finding Student instance by example"); try { List results = getHibernateTemplate().findByExample(instance); 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 Student instance with property: " + propertyName + ", value: " + value); try { String queryString = "from Student as model where model." + propertyName + "= ?"; return getHibernateTemplate().find(queryString, value); } catch (RuntimeException re) { log.error("find by property name failed", re); throw re; } } public List findByName(Object name) { return findByProperty(NAME, name); } public List findByAge(Object age) { return findByProperty(AGE, age); } public List findAll() { log.debug("finding all Student instances"); try { String queryString = "from Student"; return getHibernateTemplate().find(queryString); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public Student merge(Student detachedInstance) { log.debug("merging Student instance"); try { Student result = (Student) getHibernateTemplate().merge( detachedInstance); log.debug("merge successful"); return result; } catch (RuntimeException re) { log.error("merge failed", re); throw re; } } public void attachDirty(Student instance) { log.debug("attaching dirty Student instance"); try { getHibernateTemplate().saveOrUpdate(instance); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public void attachClean(Student instance) { log.debug("attaching clean Student instance"); try { getHibernateTemplate().lock(instance, LockMode.NONE); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public static StudentDAO getFromApplicationContext(ApplicationContext ctx) { return (StudentDAO) ctx.getBean("StudentDAO"); } }