Spring 3.0以上版本,更细颗粒化的缓存设置,更方便的注解,可以具体到把每个方式的返回值做缓存,
需要 ehcache-spring-annotations-1.1.x.jar的支持
首先,applicationContext.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" 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:ehcache="http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring/ehcache-spring-1.1.xsd"> <ehcache:annotation-driven cache-manager="ehCacheManager" /> <bean id="ehCacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"> <property name="configLocation" value="classpath:ehcache.xml" /> </bean>
其次,src下的ehcache.xml
<?xml version="1.0" encoding="UTF-8"?> <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd" updateCheck="false"> <diskStore path="java.io.tmpdir" /> <defaultCache eternal="false" maxElementsInMemory="1000" overflowToDisk="false" diskPersistent="false" timeToIdleSeconds="0" timeToLiveSeconds="600" memoryStoreEvictionPolicy="LRU" /> <cache name="departCache" eternal="false" maxElementsInMemory="100" overflowToDisk="false" diskPersistent="false" timeToIdleSeconds="0" timeToLiveSeconds="300" memoryStoreEvictionPolicy="LRU" /> </ehcache>
DAO层缓存:例如下边这个方法的返回值需要缓存:
@SuppressWarnings("unchecked") //spring 3 基于注解ehcache缓存配置; @Cacheable(cacheName="departCache") public List<AppDepart> getChildDepart(Integer id) throws Exception { return this.getHibernateTemplate().find("from AppDepart where state=1 and idParent="+id); }
@Cacheable(cacheName="departCache") 加上这句话,其中cacheName 对应ehcache.xml 中的<cache name="departCache"
这样这个方法返回值就可以被缓存起来的了,但是怎么样把缓存数据和数据库中的数据实现同步呢?
如果对这个PO做update ,save,delete 可以实现这样策略如下:
@Transactional(propagation = Propagation.REQUIRED) //设定spring的ecache缓存策略,当编辑机构时候,把缓存全部清除掉,以达到缓存那数据同步; @TriggersRemove(cacheName="departCache",removeAll=true) public boolean editDepart(String depno, String depName) { boolean flag = false; try { AppDepart depart = departDao.getAppdepart(depno); depart.setDepName(depName); departDao.update(depart); flag = true; } catch (Exception e) { e.printStackTrace(); } return flag; }
好了到此配置完毕,但是更加详细缓存配置策略需要研究(例如:当update数据时候,全部清掉缓存,就可以达到与数据库同步效果)