Spring整合Hibernate配置文件

 applicationContext.xml

<?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:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd 
    http://www.springframework.org/schema/context  
    http://www.springframework.org/schema/context/spring-context-4.1.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/aop   
    http://www.springframework.org/schema/aop/spring-aop-4.1.xsd">


    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="url" value="jdbc:mysql://localhost:3306/mydb"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource" />
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.MySQLDialect
                </prop>
                <!-- 是否打印sql -->  
                <prop key="hibernate.show_sql">true</prop>
                <!-- 格式化sql -->  
                <prop key="hibernate.format_sql">true</prop>
                <!-- 配置二级缓存 -->
                <prop key="hibernate.cache.use_second_level_cache">true</prop>
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>  
                <prop key="hibernate.net.sf.ehcache.configurationResourceName">ehcache.xml</prop>
                <!-- 开启查询时的二级缓存 -->
                <prop key="hibernate.cache.use_query_cache">true</prop>
            </props>
        </property>
        <property name="mappingResources">
            <list>
                <value>com/db/entity/User.hbm.xml</value>
            </list>
        </property>
    </bean>
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean id="UserDAO" class="com.db.entity.UserDAO">
        <property name="sessionFactory">
            <ref bean="sessionFactory" />
        </property>
    </bean>
</beans>

如果Spring也使用cache缓存则

（1） 在spring 集成hibernate 的配置文件中，修改如下cache相关配置

<!-- 开启查询缓存 -->
<prop key="hibernate.cache.use_query_cache">true</prop>
<!-- 开启二级缓存 -->
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<!-- 高速缓存提供程序 --> 
<!-- 由于spring也使用了Ehcache, 保证双方都使用同一个缓存管理器 -->
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
<prop key="hibernate.net.sf.ehcache.configurationResourceName">ehcache.xml</prop>

由于Spring也使用ehcache, 所以也需要在spring配置文件中添加ehcache的配置

    <bean id="cacheManagerEhcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
    <property name="configLocation">
            <value>classpath:ehcache.xml</value>
        </property>
        <!-- 由于hibernate也使用了Ehcache, 保证双方都使用同一个缓存管理器 -->
        <property name="shared" value="true"/>
    </bean>

ehcache.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">
    <!--
    Subdirectories can be specified below the property e.g. java.io.tmpdir/one
    -->
    <diskStore path="java.io.tmpdir"/>

    <!--
    Mandatory Default Cache configuration. These settings will be applied to caches
    created programmtically using CacheManager.add(String cacheName)
    -->
    <defaultCache
         maxElementsInMemory="10000"
         eternal="false"
         timeToIdleSeconds="120"
         timeToLiveSeconds="120"
         overflowToDisk="true"
         maxElementsOnDisk="10000000"
         diskPersistent="false"
         diskExpiryThreadIntervalSeconds="120"
         memoryStoreEvictionPolicy="LRU"
     />
    
    <cache name="org.hibernate.cache.spi.UpdateTimestampsCache"
           maxElementsInMemory="5000" 
           eternal="true" 
           overflowToDisk="true" />
    <cache name="org.hibernate.cache.internal.StandardQueryCache"
           maxElementsInMemory="10000" 
           eternal="false" 
           timeToLiveSeconds="120"
           overflowToDisk="true" />      
        
</ehcache>

默认情况下二级缓存只会对load get 之类的方法缓存， 想list iterator 之类的方法也使用缓存，必须跟查询缓存一起使用， 重写查询方法 

Query.setCahceable(true);

获取SessionFactory对象

法一：通过配置文件获取

        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        SessionFactory sessionFactory=(SessionFactory) ac.getBean("sessionFactory");
        Session ss=sessionFactory.openSession();
        User user=new User();
        user.setName("sara");
        ss.save(user);
        ss.close();

法二：手动获取(必须要有对应的hibernate.cfg.xml文件)

        SessionFactory sessionFactory;
        Configuration configuration = new Configuration();
        ServiceRegistry serviceRegistry; 
        configuration.configure();
        serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);