转自：http://cxl2012.iteye.com/blog/1944489#comments
配置一目了然
hibernate使用版本是：hibernate-release-4.2.5.Final
需要的jar包：hibernate-release-4.2.5.Final\lib\required下所有jar包
ehcache jar包：hibernate-release-4.2.5.Final\lib\optional\ehcache下所有包
junit：junit-4.10.jar和mysql-connector-java-5.1.15-bin.jar
注：hibernate 4.2.5版本ehcache缓存不依赖commons-logging-1.1.1.jar,需要的是slf4j-api-1.6.1.jar
项目结构如下
hibernate.cfg.xml
注意：hibernate4和hibernate3配置不一样，hibernate4是
Xml代码
org.hibernate.cache.ehcache.EhCacheRegionFactory
而hibernate3的配置是
Xml代码
org.hibernate.cache.EhCacheProvider
此处有一个疑问是：hibernate4的官方文档中，已经把class改了，但是属性名称没有改，还是hibernate.cache.provider_class，不是上面的hibernate.cache.region.factory_class，但是写成hibernate.cache.provider_class会报下面错误
Java代码
org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.spi.CacheImplementor]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:186)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.internal.SessionFactoryImpl.(SessionFactoryImpl.java:264)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1790)
at com.test.pojo.UserTest.beforeClass(UserTest.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.cache.NoCacheRegionFactoryAvailableException: Second-level cache is used in the application, but property hibernate.cache.region.factory_class is not given, please either disable second level cache or set correct region factoryclassname to property hibernate.cache.region.factory_class (and make sure the second level cache provider, hibernate-infinispan,forexample, is available in the classpath).
at org.hibernate.cache.internal.NoCachingRegionFactory.buildTimestampsRegion(NoCachingRegionFactory.java:87)
at org.hibernate.cache.spi.UpdateTimestampsCache.(UpdateTimestampsCache.java:62)
at org.hibernate.internal.CacheImpl.(CacheImpl.java:72)
at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:40)
at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:35)
at org.hibernate.service.internal.SessionFactoryServiceRegistryImpl.initiateService(SessionFactoryServiceRegistryImpl.java:91)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:176)
...20more
说是hibernate.cache.region.factory_class属性没有配置，估计官方文档里没有把属性改过来。。。
ehcache.xml
Xml代码
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
updateCheck="false">
name:cache唯一标识
eternal：缓存是否永久有效
maxElementsInMemory：内存中最大缓存对象数
overflowToDisk(true,false)：缓存对象达到最大数后，将缓存写到硬盘中
diskPersistent：硬盘持久化
timeToIdleSeconds：缓存清除时间
timeToLiveSeconds：缓存存活时间
memoryStoreEvictionPolicy：缓存清空策略
1.FIFO：first in first out 先讲先出
2.LFU： Less Frequently Used 一直以来最少被使用的
3.LRU：Least Recently Used 最近最少使用的
-->
timeToIdleSeconds="120"timeToLiveSeconds="120"overflowToDisk="true"/>
overflowToDisk="false"diskPersistent="false"timeToIdleSeconds="3600"
timeToLiveSeconds="3600"memoryStoreEvictionPolicy="LFU"/>
User实体类
Java代码
packagecom.test.pojo;
importjavax.persistence.Entity;
importjavax.persistence.GeneratedValue;
importjavax.persistence.GenerationType;
importjavax.persistence.Id;
importorg.hibernate.annotations.Cache;
importorg.hibernate.annotations.CacheConcurrencyStrategy;
@Entity
@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
publicclassUser {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
privateintid;
privateString name;
privateintage;
publicintgetId() {
returnid;
}
publicvoidsetId(intid) {
this.id = id;
}
publicString getName() {
returnname;
}
publicvoidsetName(String name) {
this.name = name;
}
publicintgetAge() {
returnage;
}
publicvoidsetAge(intage) {
this.age = age;
}
}
UserTest测试类：
Java代码
packagecom.test.pojo;
importorg.hibernate.HibernateException;
importorg.hibernate.Session;
importorg.hibernate.SessionFactory;
importorg.hibernate.cfg.Configuration;
importorg.hibernate.service.ServiceRegistry;
importorg.hibernate.service.ServiceRegistryBuilder;
importorg.junit.BeforeClass;
importorg.junit.Test;
publicclassUserTest {
privatestaticSessionFactory sessionFactory =null;
@BeforeClass
publicstaticvoidbeforeClass() {
Configuration configuration =newConfiguration();
try{
configuration.configure();
}catch(HibernateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ServiceRegistry serviceRegistry =newServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
@Test
publicvoidtestEhcache() {
Session session = sessionFactory.openSession();
session.beginTransaction();
User u1 = (User) session.load(User.class,3);
System.out.println(u1.getName());
session.getTransaction().commit();
session.close();
Session session2 = sessionFactory.openSession();
session2.beginTransaction();
User u2 = (User) session2.load(User.class,3);
System.out.println(u2.getName());
session2.getTransaction().commit();
session2.close();
}
}
结果：
Java代码
Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.name as name3_0_0_ from User user0_ where user0_.id=?
zhangsan
zhangsan
list二级缓存测试
Java代码
packagecom.test.pojo;
importjava.util.List;
importorg.hibernate.HibernateException;
importorg.hibernate.Session;
importorg.hibernate.SessionFactory;
importorg.hibernate.cfg.Configuration;
importorg.hibernate.service.ServiceRegistry;
importorg.hibernate.service.ServiceRegistryBuilder;
importorg.junit.BeforeClass;
importorg.junit.Test;
publicclassUserTest {
privatestaticSessionFactory sessionFactory =null;
@BeforeClass
publicstaticvoidbeforeClass() {
Configuration configuration =newConfiguration();
try{
configuration.configure();
}catch(HibernateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ServiceRegistry serviceRegistry =newServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
@SuppressWarnings("unchecked")
@Test
publicvoidtestListEhcache() {
Session session = sessionFactory.openSession();
session.beginTransaction();
List users1 = (List)session.createQuery("from User").setCacheable(true).list();
for(User user : users1) {
System.out.println(user.getName());
}
session.getTransaction().commit();
session.close();
Session session2 = sessionFactory.openSession();
session2.beginTransaction();
List users2 = (List)session2.createQuery("from User").setCacheable(true).list();
for(User user : users2) {
System.out.println(user.getName());
}
session2.getTransaction().commit();
session2.close();
}
}
输出结果：
Java代码
Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.name as name3_0_ from User user0_
zhangsan
zhangsan
lisi
wangwu
zhangsan
zhangsan
lisi
wangwu
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