接口：
package com.ph.dao;
import java.io.Serializable;
import java.util.List;
import org.hibernate.criterion.DetachedCriteria;
public interface BaseDao<T> {
public void save(T t);
public void delete(T t);
public void update(T t);
public T findById(Serializable id);
public List<T> findAll();
public Integer findCount(DetachedCriteria detachedCriteria);
public List<T> findByPage(DetachedCriteria detachedCriteria,Integer begin,Integer pageSize);
}
接口实现类：
package com.ph.dao.impl;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Projections;
import org.springframework.orm.hibernate5.support.HibernateDaoSupport;
import com.ph.dao.BaseDao;
public class BaseDaoImpl<T> extends HibernateDaoSupport implements BaseDao<T> {
private Class clazz;
public BaseDaoImpl() {
//获取子类
Class clazz = this.getClass();
//反射加载父类,获取参数化类型
Type type = clazz.getGenericSuperclass();
//获取实际类型参数
ParameterizedType pType = (ParameterizedType) type;
Type[] types = pType.getActualTypeArguments();
//设置clazz
this.clazz = (Class) types[0];
}
public void save(T t) {
this.getHibernateTemplate().save(t);
}
public void delete(T t) {
this.getHibernateTemplate().delete(t);
}
public void update(T t) {
this.getHibernateTemplate().update(t);
}
public T findById(Serializable id) {
return (T) this.getHibernateTemplate().get(clazz, id);
}
public List<T> findAll() {
return (List<T>) this.getHibernateTemplate().find("from "+clazz.getSimpleName());
}
public Integer findCount(DetachedCriteria detachedCriteria) {
detachedCriteria.setProjection(Projections.rowCount());
List<Long> list = (List<Long>) this.getHibernateTemplate().findByCriteria(detachedCriteria);
if (list.size()>0) {
return list.get(0).intValue();
}
return 0;
}
public List<T> findByPage(DetachedCriteria detachedCriteria,Integer begin,Integer pageSize) {
detachedCriteria.setProjection(null);
return (List<T>) this.getHibernateTemplate().findByCriteria(detachedCriteria, begin, pageSize);
}
}