struts2二级联动下拉列表

package com.zhaosoft.domain; 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; /** * A data access object (DAO) providing persistence and search support for City 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 com.zhaosoft.domain.City * @author MyEclipse Persistence Tools */ public class CityDAO extends HibernateDaoSupport { private static final Log log = LogFactory.getLog(CityDAO.class); protected void initDao() { //do nothing } public void save(City transientInstance) { log.debug("saving City instance"); try { getHibernateTemplate().save(transientInstance); log.debug("save successful"); } catch (RuntimeException re) { log.error("save failed", re); throw re; } } public void delete(City persistentInstance) { log.debug("deleting City instance"); try { getHibernateTemplate().delete(persistentInstance); log.debug("delete successful"); } catch (RuntimeException re) { log.error("delete failed", re); throw re; } } public City findById( java.lang.Integer id) { log.debug("getting City instance with id: " + id); try { City instance = (City) getHibernateTemplate() .get("com.zhaosoft.domain.City", id); return instance; } catch (RuntimeException re) { log.error("get failed", re); throw re; } } public List findByExample(City instance) { log.debug("finding City 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 City instance with property: " + propertyName + ", value: " + value); try { String queryString = "from City 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 findAll() { log.debug("finding all City instances"); try { String queryString = "from City"; return getHibernateTemplate().find(queryString); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public City merge(City detachedInstance) { log.debug("merging City instance"); try { City result = (City) getHibernateTemplate() .merge(detachedInstance); log.debug("merge successful"); return result; } catch (RuntimeException re) { log.error("merge failed", re); throw re; } } public void attachDirty(City instance) { log.debug("attaching dirty City instance"); try { getHibernateTemplate().saveOrUpdate(instance); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public void attachClean(City instance) { log.debug("attaching clean City instance"); try { getHibernateTemplate().lock(instance, LockMode.NONE); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public static CityDAO getFromApplicationContext(ApplicationContext ctx) { return (CityDAO) ctx.getBean("CityDAO"); } }