BaseDao<T>.java

package cn.itcast.core.dao;import java.io.Serializable;import java.util.List;public interface BaseDao<T> {	//新增	public void save(T entity);	//更新	public void update(T entity);	//根據(jù)id刪除	public void delete(Serializable id);	//根據(jù)id查找	public T findObjectById(Serializable id);	//查找列表	public List<T> findObjects();	}BaseDaoImpl<T>.java
package cn.itcast.core.dao.impl;import java.io.Serializable;import java.lang.reflect.ParameterizedType;import java.util.List;import org.hibernate.Query;import org.sPRingframework.orm.hibernate3.support.HibernateDaoSupport;import cn.itcast.core.dao.BaseDao;public abstract class BaseDaoImpl<T> extends HibernateDaoSupport implements BaseDao<T> {	Class<T> clazz;	//泛型中T的類類型		public BaseDaoImpl(){//把泛型中的T給確定		//this.getClass()取到的類是被實(shí)例化的那個類		ParameterizedType pt = (ParameterizedType) this.getClass().getGenericSuperclass();//BaseDaoImpl<User>		clazz = (Class<T>)pt.getActualTypeArguments()[0];//為什么是數(shù)組,因?yàn)榭赡苁?lt;T,E>的形式	}		@Override	public void save(T entity) {		getHibernateTemplate().save(entity);	}	@Override	public void update(T entity) {		getHibernateTemplate().update(entity);	}	@Override	public void delete(Serializable id) {		getHibernateTemplate().delete(findObjectById(id));	}	@Override	public T findObjectById(Serializable id) {		return getHibernateTemplate().get(clazz, id);	}	@Override	public List<T> findObjects() {		Query query = getsession().createQuery("FROM "+clazz.getSimpleName());//hql		return query.list();	}}