public class CommonDaoImpl<T>  extends HibernateDaoSupport implements ICommonDao<T> {

    //泛型转化
    Class entityClass = TUtils.getActualType(this.getClass());
    /**
     * 如何来实现这个save方法：通过HibernateDaoSupport 来实现，需要注入sessionFactory
     */
    @Resource
    public void setDi(SessionFactory sessionFactory){
        this.setSessionFactory(sessionFactory);
    }
    @Override
    public void save(T entity) {
        this.getHibernateTemplate().save(entity);
    }

    public void update(T entity){
        this.getHibernateTemplate().update(entity);
    }
    @Override
    public T findObjectById(Serializable id) {
//        Class entityClass = TUtils.getActualType(this.getClass());
        return (T) this.getHibernateTemplate().get(entityClass, id);   //entityClass 此处需要类型
    }
    @Override
    public void deleteObjectByIds(Serializable... ids) {
        if(ids != null && ids.length > 0){
            for(Serializable id:ids){
                Object entity = this.findObjectById(id);
                this.getHibernateTemplate().delete(entity);
            }
        }
//        this.getHibernateTemplate().delete(entity);
    }
    @Override
    public void deleteObjectByCollection(List<T> list) {
            this.getHibernateTemplate().deleteAll(list);
    }
}

package junit;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.itheima.elec.bean.ElecText;
import com.itheima.elec.dao.IElecTextDao;

public class TestDao {

    @Test
    public void save(){
        //加载spring容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        IElecTextDao elecTextDao =  (IElecTextDao) ac.getBean(IElecTextDao.SERVICE_NAME);
        
        ElecText elecText = new ElecText();
        elecText.setTextName("aaaaaaaaaa");
        elecText.setTextDate(new Date());
        elecText.setTextRemark("aaaaaaaaaaaaaaa test");
        
        elecTextDao.save(elecText);
    }
    
    @Test
    public void update(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        IElecTextDao elecTextDao = (IElecTextDao) ac.getBean(IElecTextDao.SERVICE_NAME);
        
        ElecText elecText = new ElecText();
        elecText.setTextID("8a80809359876a330159876a365b0001");
        elecText.setTextName("TestDaoupdate");
        elecText.setTextDate(new Date());
        elecText.setTextRemark("TestDao test update");
        
        elecTextDao.update(elecText);
        
    }
    
    @Test
    public void findObjectById(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        IElecTextDao elecTextDao = (IElecTextDao) ac.getBean(IElecTextDao.SERVICE_NAME);
        Serializable id = "8a80809359876a330159876a365b0001";
        ElecText elecText= elecTextDao.findObjectById(id);
        System.out.println(elecText.getTextName() + "+" + elecText.getTextRemark());
    }
    @Test
    public void deleteObjectByIds(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        IElecTextDao elecTextDao = (IElecTextDao) ac.getBean(IElecTextDao.SERVICE_NAME);
//        Serializable ids = "297e3503598229df0159822ac8000001";
        Serializable[] ids = {"297e3503598229df0159822ac8000001","297e35035985f149015985f1ea770001"};
        elecTextDao.deleteObjectByIds(ids);
    }
    
    @Test 
    public void deleteObjectByCollection(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
        IElecTextDao elecTextDao = (IElecTextDao) ac.getBean(IElecTextDao.SERVICE_NAME);
        
        List<ElecText> list = new ArrayList<ElecText>();
        ElecText elecText1 = new ElecText();
        elecText1.setTextID("297e350359873d030159873d7ab20001");
        
        ElecText elecText2 = new ElecText();
        elecText2.setTextID("8a80809359876a330159876a365b0001");
        
        ElecText elecText3 = new ElecText();
        elecText3.setTextID("8a8080935987d7c5015987d7c8d40001");
        
        list.add(elecText1);
        list.add(elecText2);
        list.add(elecText3);
        
        elecTextDao.deleteObjectByCollection(list);
        
    }
}