一：

package com.wzs.test2.dao;import java.util.List;public interface CommonDAO {	public 
     
       void sava(T entity); // 保存用户，无返回值；	public 
      
        void remove(T entity); // 删除用户	public 
       
         void update(T entity); // 更新用户	public 
        
          T findById(Class
         
           entityClass, Integer id); // 通过id来查找某一个用户；	public 
          
            List
           
             findAll(Class
            
              entityclass); // 使用范型List<>。查询全部的用户信息}
            
           
          
         
        
       
      
     

package com.wzs.test2.dao.impl;import java.util.List;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import com.wzs.test2.dao.CommonDAO;public class CommonDAOImpl extends HibernateDaoSupport implements CommonDAO {	@SuppressWarnings("unchecked")	public 
     
       List
      
        findAll(Class
       
         entityclass) {		String hql = "from " + entityclass.getName() + " as a order by a.id desc";		return this.getHibernateTemplate().find(hql);	}	@SuppressWarnings("unchecked")	public 
        
          T findById(Class
         
           entityClass, Integer id) {		return (T) this.getHibernateTemplate().get(entityClass, id);	}	public 
          
            void remove(T entity) { this.getHibernateTemplate().delete(entity); } public 
           
             void sava(T entity) { this.getHibernateTemplate().save(entity); } public 
            
              void update(T entity) { this.getHibernateTemplate().update(entity); }}
            
           
          
         
        
       
      
     

二：

package com.wzs.test.dao;import java.io.Serializable;import java.util.Collection;public interface BaseDao
     
       {	public void saveEntity(T t);	public Collection
      
        get();	public void updateEntity(T t);	public void deleteEntity(Serializable id);	public T getEntityById(Serializable id);}
      
     

package com.wzs.test.dao.impl;import java.io.Serializable;import java.lang.reflect.ParameterizedType;import java.util.Collection;import org.springframework.orm.hibernate3.HibernateTemplate;import com.wzs.test.dao.BaseDao;public class BaseDaoImpl
     
       implements BaseDao
      
        {	private HibernateTemplate hibernateTemplate;	private Class classt;	public BaseDaoImpl() {		// ParameterizedType就是泛型，关键部分		ParameterizedType type = (ParameterizedType) this.getClass().getGenericSuperclass();		this.classt = (Class) type.getActualTypeArguments()[0];// 
       
        		System.out.println(type.getRawType());	}	public void deleteEntity(Serializable id) {		T t = this.getEntityById(id);		hibernateTemplate.delete(t);	}	public Collection
        
          get() {		System.out.println(classt.getSimpleName());		return this.hibernateTemplate.find("from " + classt.getSimpleName());	}	public T getEntityById(Serializable id) {		return (T) this.hibernateTemplate.get(classt, id);	}	public void saveEntity(T t) {		this.hibernateTemplate.save(t);	}	public void updateEntity(T t) {		this.hibernateTemplate.update(t);	}	// set&&get	public HibernateTemplate getHibernateTemplate() {		return hibernateTemplate;	}	public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {		this.hibernateTemplate = hibernateTemplate;	}}
        
       
      
     

package com.wzs.test.dao;public interface StudentDao
     
       extends BaseDao
      
        {}
      
     

package com.wzs.test.dao.impl;import org.springframework.stereotype.Component;import com.wzs.test.dao.StudentDao;import com.wzs.test.dao.bean.Student;@Componentpublic class StudentDaoImpl extends BaseDaoImpl
     
       implements StudentDao
      
        {}
      
     

package com.wzs.test.dao.bean;public class Student {}

參考：

http://www.cnblogs.com/shenliang123/archive/2012/04/05/2433134.html

http://blog.csdn.net/qiaoge134/article/details/20228139