hibernate ehcache二级缓存

<?xml version="1.0" encoding="UTF-8"?>
<ehcache>
    <!-- Sets the path to the directory where cache .data files are created.
         设置缓存文件保存的目录
         The following properties are translated:
         user.home - User's home directory 
         如果设置user.home则目录是：C:\Users\Administrator
         user.dir - User's current working directory - 当前项目的工作目录
         java.io.tmpdir - Default temp file path
         系统的临时目录：
          -->
    <diskStore path="d:/a"/>
    <!-- 以下是配置默认的缓存，如果没有指定哪一个类，缓存的哪一个文件中，则都使用默认的缓存策略 -->
    <!--Default Cache configuration. These will applied to caches programmatically created through
        the CacheManager.

        The following attributes are required for defaultCache:

        maxInMemory       - Sets the maximum number of objects that will be created in memory
                        设置在内存中最多可以保存多少个对象
        eternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the element
                            is never expired. 如果设置为true，则一个对象保存在内存中永远不过期
        timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used
                            if the element is not eternal. Idle time is now - last accessed time
                           设置一个空闲时间=现在的时间 - 最后访问时间
        timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used
                            if the element is not eternal. TTL is now - creation time
                            TTL = 当前时间- 创建时间
        overflowToDisk    - Sets whether elements can overflow to disk when the in-memory cache
                            has reached the maxInMemory limit.
         memoryStoreEvictionPolicy 保存策略：
            FIFO- First In First Out
            LFU   - Less Frequtly Use
            LRU     less Recently(最近) Use

        -->
    <defaultCache
        maxElementsInMemory="100"
        eternal="false"
        timeToIdleSeconds="120"
        timeToLiveSeconds="120"
        overflowToDisk="true"
        memoryStoreEvictionPolicy="FIFO"
        />
</ehcache>

<!-- 配置打开二级缓存 -->
        <property name="hibernate.cache.use_second_level_cache">true</property>
        <!-- 提供二缓存的类 -->
        <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>

<!-- 对某个类进行二级缓存 -->
<class-cache usage="read-write" class="cn.domain03.Book"/>

<mapping resource="cn/domain03/Book.hbm.xml"/>
  <!-- 对某个类进行二级缓存 -->
  <class-cache usage="read-write" class="cn.domain03.Book"/>