Spring JpaTransactionManager事务管理

package com.spring.jpa;

import com.spring.model.Product;

public interface ProductDao {
	public void save(Product p);
}

 2.productDaoImpl.java

package com.spring.jpa;import javax.persistence.EntityManager;import javax.persistence.EntityManagerFactory;import javax.persistence.Persistence;import com.spring.model.Product;public class ProductDaoImpl implements ProductDao {	public void save(Product p) {		EntityManagerFactory emf = Persistence.createEntityManagerFactory("SimplePU");		EntityManager em = emf.createEntityManager();		em.getTransaction().begin();		em.persist(p);		em.getTransaction().commit();		emf.close();	}}

 3.ProductManager.java

package com.spring.jpa;import com.spring.model.Product;public interface ProductManager {		public void save(Product p);}

 4.ProductManagerImpl.java

package com.spring.jpa;import com.spring.model.Product;public class ProductManagerImpl implements ProductManager{		private ProductDao productDao = new ProductDaoImpl();		@Override	public void save(Product p) {		productDao.save(p);	}}

 5.persistence.xml

<?xml version="1.0" encoding="UTF-8"?><!-- 切记，该文件一定要放在/WEB-INF/classes/META-INF这里才能生效 --><persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">	<persistence-unit name="SimplePU"		transaction-type="RESOURCE_LOCAL">		<provider>org.hibernate.ejb.HibernatePersistence</provider>		<class>com.spring.model.Product</class>		<properties>			<property name="hibernate.connection.driver_class"				value="com.mysql.jdbc.Driver" />			<property name="hibernate.connection.url"				value="jdbc:mysql://127.0.0.1:3306/jinhonglun" />			<property name="hibernate.connection.username" value="root" />			<property name="hibernate.connection.password" value="root" />			<property name="hibernate.dialect"				value="org.hibernate.dialect.MySQL5Dialect" />			<property name="hibernate.show_sql" value="true" />			<property name="hibernate.format_sql" value="true" />			<property name="hibernate.use_sql_comments" value="false" />			<property name="hibernate.hbm2ddl.auto" value="update" />		</properties>	</persistence-unit></persistence>

 6.SimpleSpringJpaDemo.java

package com.spring.jpa;import com.spring.model.Product;public class SimpleSpringJpaDemo {	public static void main(String[] args) {		Product p = new Product();		p.setProductTitle("JPA测试");		new ProductManagerImpl().save(p);	}}

 接下来进行主题介绍JpaTransactionManager:
 * 我们引入 Spring，以展示 Spring 框架对 JPA 的支持。业务层接口 ProductManager 保持不变，ProductManagerImpl 中增加了三个注解，
 * 以让 Spring 完成依赖注入，因此不再需要使用 new 操作符创建 ProductDaoImpl 对象了。同时我们还使用了 Spring 的声明式事务：

package com.spring.jpaTransactionManager;import javax.persistence.EntityManager;import javax.persistence.PersistenceContext;import org.springframework.stereotype.Repository;import org.springframework.transaction.annotation.Transactional;import com.spring.model.Product;@Repository("productDao")public class ProductDaoImpl implements ProductDao {		@PersistenceContext 	private EntityManager em; 		@Transactional	public void save(Product p) {		em.persist(p);	}}

 2.ProductManagerImpl.java

package com.spring.jpaTransactionManager;import javax.annotation.Resource;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import com.spring.model.Product;@Service("productManager")public class ProductManagerImpl implements ProductManager{		@Resource	private ProductDao productDao;		@Transactional	@Override	public void save(Product p) {		productDao.save(p);	}}

 3.SimpleSpringJpaDemo.java

package com.spring.jpaTransactionManager;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.spring.model.Product;public class SimpleSpringJpaDemo {	public static void main(String[] args) {		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:/com/spring/jpaTransactionManager/spring-jpa.xml");		ProductDao productDao = ctx.getBean("productDao", ProductDao.class);				Product p = new Product();		p.setProductTitle("JPA  Spring与JpaTransactionManager结合测试");		productDao.save(p);	}}

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"	xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"	xmlns:util="http://www.springframework.org/schema/util" xmlns:aop="http://www.springframework.org/schema/aop"	xsi:schemaLocation="	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd	http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">	 	 <!-- 自动扫描包，自动将@Repository、@Service、@Controller 和 @Component自动实例化 -->     <context:component-scan base-package="com.spring.jpaTransactionManager" />     <!-- Spring 事务配置，声明式事务 -->     <tx:annotation-driven transaction-manager="transactionManager" />     <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">     	<property name="entityManagerFactory" ref="entityManagerFactory" />     </bean>     <!-- LocalContainerEntityManagerFactoryBean 会自动检测 persistence units ，     	  实际上，就是META-INF/persistence.xml（/WEB-INF/classes/META-INF） 文件和web.xml中的persistence-unit-ref，          以及定义的environment naming -->     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">     	     </bean></beans>