jpa集成Spring实现

先写上jpa实现，以后补上Hibernate实现，并加以对比

package junit.test;


import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.sql.DataSource;

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

import com.itcast.product.ProductType;
import com.itcast.service.product.ProductService;
import com.itcast.service.product.impl.ProductServiceBean;

public class TestProduct {

	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
	}
	@Test
	public void testrun(){
		/*jpa实现存储*/
//		EntityManagerFactory factory = Persistence.createEntityManagerFactory("itcast");
//		EntityManager em = factory.createEntityManager();
//		em.getTransaction().begin();
//		em.persist(new ProductType());
//		em.getTransaction().commit();
//		em.close();
//		factory.close();	
		/*通过Spring注入的jpa实现*/
		ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
		ProductService ps = (ProductService)cxt.getBean("productServiceBean");
		ps.save(new ProductType());
	}

}