浅析Spring与hibernate整合

  最近在学ssh框架，学完了每个框架的运用，就开始准备整合ssh了，今天就先浅析一下spring和hibernate的整合。

1、Spring与Hibernate整合关键点：

         1） Hibernate的SessionFactory对象交给Spring创建；

         2） hibernate事务交给spring的声明式事务管理。

2、SH整合步骤：

         1）引入jar包

                   连接池/数据库驱动包

                   Hibernate相关jar

                   Spring核心包(5个)

                   Springaop 包(4个)

                   spring-orm-3.2.5.RELEASE.jar                 【spring对hibernate的支持】

   spring-tx-3.2.5.RELEASE.jar                     【事务相关】

                    

         2）配置

                   hibernate.cfg.xml

                   bean.xml

3、代码示例

1）Entity 与 hibernate映射文件

public class Dept {private int id;private String name;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="cn.itcast.entity"><class name="Dept" table="t_dept"><id name="id" column="deptId"><generator class="native"></generator></id><property name="name" column="deptName"></property></class></hibernate-mapping>

2）DAO 数据访问层

// 数据访问层public class DeptDao {// Spring与Hibernate整合： IOC容器注入private SessionFactory sessionFactory;public void setSessionFactory(SessionFactory sessionFactory) {this.sessionFactory = sessionFactory;}// 保存一个记录// Spring与Hibernate整合：事务管理交给Springpublic void save(Dept dept) {sessionFactory.getCurrentSession().save(dept);}}

3）Service层 DeptService

public class DeptService {private DeptDao deptDao;public void setDeptDao(DeptDao deptDao) {this.deptDao = deptDao;}public void save(Dept dept){deptDao.save(dept);}}

4）实例测试  App.java  

public class App {// 容器private ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");@Testpublic void testApp() throws Exception {DeptService deptServie = (DeptService) ac.getBean("deptService");System.out.println(deptServie.getClass());deptServie.save(new Dept());}}

5） bean.xml 配置  【Spring管理SessionFactory的3种方式】

<?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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans     http://www.springframework.org/schema/beans/spring-beans.xsd      http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context.xsd         http://www.springframework.org/schema/aop         http://www.springframework.org/schema/aop/spring-aop.xsd         http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx.xsd"><!-- dao 实例 --><bean id="deptDao" class="cn.itcast.dao.DeptDao"><property name="sessionFactory" ref="sessionFactory"></property></bean><!-- service 实例 --><bean id="deptService" class="cn.itcast.service.DeptService"><property name="deptDao" ref="deptDao"></property></bean><!-- 数据源配置 --><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="com.mysql.jdbc.Driver"></property><property name="jdbcUrl" value="jdbc:mysql:///hib_demo"></property><property name="user" value="root"></property><property name="password" value="root"></property><property name="initialPoolSize" value="3"></property><property name="maxPoolSize" value="10"></property><property name="maxStatements" value="100"></property><property name="acquireIncrement" value="2"></property></bean><!-- ###########Spring与Hibernate整合  start########### --><!-- 方式（1）直接加载hibernate.cfg.xml文件的方式整合<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"><property name="configLocation" value="classpath:hibernate.cfg.xml"></property></bean>    --><!-- 方式（2）连接池交给spring管理  【一部分配置写到hibernate中，一份分在spring中完成】 <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"><property name="configLocation" value="classpath:hibernate.cfg.xml"></property><property name="dataSource" ref="dataSource"></property></bean> --><!-- 【推荐】方式（3）所有的配置全部都在Spring配置文件中完成 --><bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"><!-- 注入连接池对象 --><property name="dataSource" ref="dataSource"></property><!-- hibernate常用配置 --><property name="hibernateProperties"><props><prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop><prop key="hibernate.show_sql">true</prop><prop key="hibernate.hbm2ddl.auto">update</prop></props></property><!-- hibernate映射配置 <property name="mappingLocations"><list><value>classpath:cn/itcast/entity/*.hbm.xml</value></list></property>--><property name="mappingDirectoryLocations"><list><value>classpath:cn/itcast/entity/</value></list></property></bean><!-- ###########Spring与Hibernate整合  end########### --><!-- 事务配置 --><!-- a. 配置事务管理器类 --><bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory"></property></bean><!-- b. 配置事务增强(拦截到方法后如果管理事务?) --><tx:advice id="txAdvice" transaction-manager="txManager"><tx:attributes><tx:method name="*" read-only="false"/></tx:attributes></tx:advice><!-- c. Aop配置 --><aop:config> <aop:pointcut expression="execution(* cn.itcast.service.*.*(..))" id="pt"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/></aop:config></beans>