本示例完整代码请见：

首先在classpath下新建META-INF目录，并新建文件persistence.xml

    	
     	
     		
      
       org.hibernate.ejb.HibernatePersistence
      		
      
       com.yaolifei.test.user.domain.User
      		
      			
       			
       			
       			
       			
       			
       			
       		
      	
     
    

package com.yaolifei.test.user.dao;import java.util.List;import javax.persistence.EntityManager;import javax.persistence.EntityManagerFactory;import javax.persistence.Query;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Repository;import com.yaolifei.test.user.domain.User;@Repository("userDao")public class UserDaoImpl implements UserDao {		@Autowired	private EntityManagerFactory entityManagerFactory;	@Override	public User getById(Integer id) {		EntityManager entityManager = entityManagerFactory.createEntityManager();		entityManager.getTransaction().begin();		User user = (User) entityManager.find(User.class, id);		entityManager.getTransaction().commit();		return user;	}	@Override	public List
    
      getAll() {		EntityManager entityManager = entityManagerFactory.createEntityManager();		entityManager.getTransaction().begin();		Query query = entityManager.createQuery("from User");		List
     
       list = query.getResultList();		entityManager.getTransaction().commit();		return list;	}	@Override	public void save(User user) {		EntityManager entityManager = entityManagerFactory.createEntityManager();		entityManager.getTransaction().begin();		entityManager.persist(user);		entityManager.getTransaction().commit();	}	@Override	public void update(User user) {		EntityManager entityManager = entityManagerFactory.createEntityManager();		entityManager.getTransaction().begin();		entityManager.merge(user);		entityManager.getTransaction().commit();	}	@Override	public void remove(User user) {		EntityManager entityManager = entityManagerFactory.createEntityManager();		entityManager.getTransaction().begin();		entityManager.remove(user);		entityManager.getTransaction().commit();	}}