一：环境搭建
???? controller层采用springmvc,前后台交互使用json,数据库操作使用spring data jpa,采用ehcache缓存降低操作数据库的负载。
??? 1.1 ? web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>ehcache</display-name>
<!-- spring配置文件加载 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext.xml,
classpath*:springContext.xml,
classpath*:web-servlet.xml
</param-value>
</context-param>
<!-- spring配置 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- spring配置文件结束 -->
<!-- springMVC的监听器 -->
<servlet>
<servlet-name>web-practice</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>web-practice</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<!--ehcache 页面缓存过滤器 -->
<filter>
<filter-name>PageCachingFilter</filter-name>
<filter-class>net.sf.ehcache.constructs.web.filter.SimplePageCachingFilter</filter-class>
<init-param>
<param-name>cacheName</param-name>
<param-value>SimplePageCachingFilter</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>PageCachingFilter</filter-name>
<url-pattern>/userController/testPageCache.action</url-pattern>
</filter-mapping>
<!-- 配置log4j -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>3000</param-value>
</context-param>
<!-- 配置过滤器，同时把所有的请求都转为utf-8编码 -->
<filter>
<filter-name>Spring character encoding filter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Spring character encoding filter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
?? 1.2 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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:cache="http://www.springframework.org/schema/cache"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache.xsd">
<!-- 开启注解 -->
<context:annotation-config model="aspectj" />
<!-- 扫描包 -->
<context:component-scan base-package="com.travelsky.pss" />
<!-- 自动扫描并注入Spring Data JPA -->
<jpa:repositories base-package="com.travelsky.pss.dao"
entity-manager-factory-ref="entityManagerFactory"
transaction-manager-ref="transactionManager" />
<!-- 加载JDBC连接信息 -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- 开启事物 -->
<tx:annotation-driven transaction-manager="transactionManager"
proxy-target-class="false" />
<cache:annotation-driven cache-manager="ehcacheManager"/>
<!-- cacheManager工厂类，指定ehcache.xml的位置 -->
<bean id="ehcacheManagerFactory" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" p:shared="true">
<property name="configLocation" value="classpath:ehcache.xml" />
</bean>
<!-- 声明cacheManager -->
<bean id="ehcacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
<property name="cacheManager" ref="ehcacheManagerFactory" />
</bean>
<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.driverUrl}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- 配置连接池的初始值 -->
<property name="initialSize" value="${jdbc.initialSize}" />
<!-- 连接池的最大值 -->
<!-- <property name="maxActive" value="500"/> -->
<!-- 最大空闲时，当经过一个高峰之后，连接池可以将一些用不到的连接释放，一直减少到maxIdle为止 -->
<!-- <property name="maxIdle" value="2"/> -->
<!-- 当最小空闲时，当连接少于minIdle时会自动去申请一些连接 -->
<property name="minIdle" value="${jdbc.minIdle}" />
<property name="maxActive" value="${jdbc.maxActive}" />
<property name="maxWait" value="${jdbc.maxWait}" />
</bean>
<!-- 配置entityManagerFactory -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="persistenceUnitName" value="react" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="database" value="MYSQL"></property>
<property name="showSql" value="true"></property>
<property name="generateDdl" value="true" />
</bean>
</property>
<property name="packagesToScan">
<list>
<value>com.travelsky.pss.vo</value>
</list>
</property>
<property name="jpaPropertyMap" ref="jpaPropertyMap" />
</bean>
<util:map id="jpaPropertyMap">
<entry key="dialect" value="org.hibernate.dialect.MySQLDialect" />
<entry key="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy" />
<entry key="hibernate.hbm2ddl.auto" value="none" />
<entry key="hibernate.cache.use_second_level_cache" value="false" />
<entry key="hibernate.cache.use_query_cache" value="false" />
<entry key="hibernate.generate_statistics" value="false" />
<entry key="show_sql" value="true" />
<entry key="format_sql" value="false" />
<entry key="javax.persistence.validation.mode" value="none" />
</util:map>
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- 开启AOP监听 -->
<aop:aspectj-autoproxy expose-proxy="true" />
<!-- 配置哪些方法要加入事务控制 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- 让所有的方法都加入事务管理，为了提高效率，可以把一些查询之类的方法设置为只读的事务 -->
<tx:method name="*" propagation="REQUIRED" read-only="true" />
<!-- 以下方法都是可能设计修改的方法，就无法设置为只读 -->
<tx:method name="insert*" propagation="REQUIRED" read-only="false" />
<tx:method name="add*" propagation="REQUIRED" read-only="false" />
<tx:method name="del*" propagation="REQUIRED" read-only="false" />
<tx:method name="update*" propagation="REQUIRED" read-only="false" />
<tx:method name="save*" propagation="REQUIRED" read-only="false" />
<tx:method name="clear*" propagation="REQUIRED" read-only="false" />
</tx:attributes>
</tx:advice>
<!-- 配置AOP，Spring是通过AOP来进行事务管理的 -->
<aop:config>
<!-- 设置pointCut表示哪些方法要加入事务处理 -->
<aop:pointcut id="allMethods"
expression="execution(* com.travelsky.pss.*.service..*.*(..))" />
<!-- 通过advisor来确定具体要加入事务控制的方法 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="allMethods" />
</aop:config>
</beans>
? 1.3 springmvc配置
??
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 注解扫描包 -->
<context:component-scan base-package="com.travelsky.pss"/>
<!-- 打开注解 -->
<mvc:annotation-driven />
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jsonHttpMessageConverter"/>
</list>
</property>
</bean>
<!-- JSON的转换 -->
<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
<!-- 配置视图解析器，将ModelAndView解析为具体的页面 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="contentType" value="text/html; charset=utf-8"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</beans>
?? 1.4 ehcache.xml
??
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
monitoring="autodetect" dynamicConfig="true"
>
<!--
monitoring: 使用"autodetect"值，Terracotta集群的出现将被检测和监视，并通过Developer控制台激活
dynamicConfig: 能够使与这个CacheManager相关联的动态配置失活。这个设置的默认值是true-例如，动态配置是激活的
-->
<diskStore path="java.io.tmpdir" />
<defaultCache maxEntriesLocalHeap="10000" eternal="false"
overflowToDisk="false" timeToIdleSeconds="120" timeToLiveSeconds="120"
diskSpoolBufferSizeMB="30" maxEntriesLocalDisk="10000000"
diskExpiryThreadIntervalSeconds="120" memoryStoreEvictionPolicy="LRU">
<persistence strategy="localTempSwap" />
</defaultCache>
<!--
maxBytesLocalHeap:主要是用来限制缓存所能使用的堆内存的最大字节数
maxEntriesLocalHeap:用来限制当前缓存在堆内存上所能保存的最大元素数量的
maxEntriesLocalDisk:用来限制在磁盘上所能保存的元素的最大数量的
eternal :缓存中对象是否永久有效,即是否永驻内存,如果为true,将忽略timeToIdleSeconds="300" timeToLiveSeconds="600"
timeToIdleSeconds : 缓存数据在失效前的允许闲置时间(单位:秒),仅当eternal=false时使用,默认值是0表示可闲置时间无穷大,此为可选属性
即访问这个cache中元素的最大间隔时间,若超过这个时间没有访问此Cache中的某个元素,那么此元素将被从Cache中清除
timeToLiveSeconds : 缓存数据在失效前的允许存活时间(单位:秒),仅当eternal=false时使用,默认值是0表示可存活时间无穷大
即Cache中的某元素从创建到清楚的生存时间,也就是说从创建开始计时,当超过这个时间时,此元素将从Cache中清除
overflowToDisk : 内存不足时,是否启用磁盘缓存(即内存中对象数量达到maxElementsInMemory时,Ehcache会将对象写到磁盘中)
memoryStoreEvictionPolicy : 内存存储与释放策略,即达到maxElementsInMemory限制时,Ehcache会根据指定策略清理内存
共有三种策略,分别为LRU(最近最少使用)、LFU(最常用的)、FIFO(先进先出)
transactionalMode: 使ehcache作为JTA事务的参与者
-->
<cache name="myCache" maxEntriesLocalHeap="10000"
maxEntriesLocalDisk="1000" eternal="false" diskSpoolBufferSizeMB="30"
timeToIdleSeconds="300" timeToLiveSeconds="600"
memoryStoreEvictionPolicy="LRU" transactionalMode="off">
<cacheEventListenerFactory class="com.travelsky.pss.listener.MyCacheEventListenerFactory"/>
<persistence strategy="localTempSwap" />
</cache>
<!-- 页面全部缓存 -->
<cache name="SimplePageCachingFilter"
maxElementsInMemory="10"
maxElementsOnDisk="10"
eternal="false"
overflowToDisk="false"
timeToIdleSeconds="120"
timeToLiveSeconds="60"
memoryStoreEvictionPolicy="LFU">
</cache>
</ehcache>
? 1.5：jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.driverUrl = jdbc:mysql://localhost:3306/ehcache?useUnicode=true&characterEncoding=UTF-8 jdbc.username = root jdbc.password = 123 jdbc.initialSize=1 jdbc.minIdle=1 jdbc.maxActive=50 jdbc.maxWait=100
?二：代码示例
?? 2.1 controller层
package com.travelsky.pss.controller;
import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.travelsky.pss.service.UserService;
import com.travelsky.pss.vo.User;
@Controller
@RequestMapping("/userController")
public class UserController {
@Autowired
private transient UserService userService;
@ResponseBody
@RequestMapping("/saveUser")
public String saveUser(HttpServletRequest request,
HttpServletResponse response) {
String userId = request.getParameter("userId");
String username = request.getParameter("userName");
User user = new User();
user.setId(userId);
user.setUserName(username);
user.setSex("0");
user.setAge("25");
userService.save(user);
return "SUCCESS";
}
@RequestMapping("/findUser")
public ModelAndView findUser() {
ModelMap modelMap = new ModelMap();
User user = userService.find("0");
modelMap.addAttribute("data", user);
return new ModelAndView("show", modelMap);
}
@RequestMapping("/coutUserNum")
public ModelAndView coutUserNum(){
ModelMap modelMap = new ModelMap();
int number = userService.coutNum();
modelMap.addAttribute("number", number);
return new ModelAndView("count", modelMap);
}
@RequestMapping("/testPageCache")
public ModelAndView testPageCache(){
ModelMap modelMap = new ModelMap();
System.out.println("===========页面缓存进来了");
modelMap.addAttribute("data", new Date());
return new ModelAndView("pageCache", modelMap);
}
}
? 2.2 service层
package com.travelsky.pss.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
import com.travelsky.pss.dao.UserDao;
import com.travelsky.pss.vo.User;
@Service("userService")
public class UserService {
@Autowired
private transient UserDao userDao;
@CacheEvict(value="myCache",key="0",beforeInvocation=true)
public void save(User user){
userDao.save(user);
}
@Cacheable(value="myCache",key="#id")
public User find(String id){
return userDao.findOne(id);
}
public void delete(String id){
userDao.delete(id);
}
public void update(User user) {
userDao.saveAndFlush(user);
}
@Cacheable(value="myCache", key="0")
public int coutNum(){
int numer = userDao.findAll().size();
return numer;
}
}
? ?2.3 dao层
?
package com.travelsky.pss.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.travelsky.pss.vo.User;
@Repository
public interface UserDao extends JpaRepository<User,String> {
}
? 2.4 浏览器访问
?http://localhost:8080/ehcache/userController/coutUserNum.action
?效果如下：
Tue May 31 16:24:29 CST 2016 缓存测试 User的数量: 6
?? 查看eclipse控制台
[20160531 16:24:29][http-bio-8080-exec-6][DispatcherServlet.doService]DispatcherServlet with name ‘web-practice‘ processing GET request for [/ehcache/userController/coutUserNum.action] [20160531 16:24:29][http-bio-8080-exec-6][AbstractHandlerMethodMapping.getHandlerInternal]Looking up handler method for path /userController/coutUserNum.action [20160531 16:24:29][http-bio-8080-exec-6][AbstractHandlerMethodMapping.getHandlerInternal]Returning handler method [public org.springframework.web.servlet.ModelAndView com.travelsky.pss.controller.UserController.coutUserNum()] [20160531 16:24:29][http-bio-8080-exec-6][AbstractBeanFactory.doGetBean]Returning cached instance of singleton bean ‘userController‘ [20160531 16:24:29][http-bio-8080-exec-6][DispatcherServlet.doDispatch]Last-Modified value for [/ehcache/userController/coutUserNum.action] is: -1 expired [20160531 16:24:29][http-bio-8080-exec-6][AbstractPlatformTransactionManager.getTransaction]Creating new transaction with name [org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT,readOnly; ‘‘ [20160531 16:24:29][http-bio-8080-exec-6][JpaTransactionManager.doBegin]Opened new EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@18c53c] for JPA transaction [20160531 16:24:29][http-bio-8080-exec-6][AbstractTransactionImpl.begin]begin [20160531 16:24:29][http-bio-8080-exec-6][LogicalConnectionImpl.obtainConnection]Obtaining JDBC connection [20160531 16:24:29][http-bio-8080-exec-6][LogicalConnectionImpl.obtainConnection]Obtained JDBC connection [20160531 16:24:29][http-bio-8080-exec-6][JdbcTransaction.doBegin]initial autocommit status: true [20160531 16:24:29][http-bio-8080-exec-6][JdbcTransaction.doBegin]disabling autocommit [20160531 16:24:29][http-bio-8080-exec-6][JpaTransactionManager.doBegin]Exposing JPA transaction as JDBC transaction [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@3cf593] [20160531 16:24:29][http-bio-8080-exec-6][CriteriaQueryImpl.interpret]Rendered criteria query -> select generatedAlias0 from User as generatedAlias0 [20160531 16:24:29][http-bio-8080-exec-6][SqlStatementLogger.logStatement]select user0_.id as id1_0_, user0_.age as age2_0_, user0_.sex as sex3_0_, user0_.name as name4_0_ from user user0_ Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.sex as sex3_0_, user0_.name as name4_0_ from user user0_ [20160531 16:24:29][http-bio-8080-exec-6][Loader.processResultSet]Result set row: 0 [20160531 16:24:29][http-bio-8080-exec-6][Loader.getRow]Result row: EntityKey[com.travelsky.pss.vo.User#0] [20160531 16:24:29][http-bio-8080-exec-6][Loader.processResultSet]Result set row: 1 [20160531 16:24:29][http-bio-8080-exec-6][Loader.getRow]Result row: EntityKey[com.travelsky.pss.vo.User#1] [20160531 16:24:29][http-bio-8080-exec-6][Loader.processResultSet]Result set row: 2 [20160531 16:24:29][http-bio-8080-exec-6][Loader.getRow]Result row: EntityKey[com.travelsky.pss.vo.User#2] [20160531 16:24:29][http-bio-8080-exec-6][Loader.processResultSet]Result set row: 3 [20160531 16:24:29][http-bio-8080-exec-6][Loader.getRow]Result row: EntityKey[com.travelsky.pss.vo.User#11] [20160531 16:24:29][http-bio-8080-exec-6][Loader.processResultSet]Result set row: 4 [20160531 16:24:29][http-bio-8080-exec-6][Loader.getRow]Result row: EntityKey[com.travelsky.pss.vo.User#66] [20160531 16:24:29][http-bio-8080-exec-6][Loader.processResultSet]Result set row: 5 [20160531 16:24:29][http-bio-8080-exec-6][Loader.getRow]Result row: EntityKey[com.travelsky.pss.vo.User#5555] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Resolving associations for [com.travelsky.pss.vo.User#0] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Done materializing entity [com.travelsky.pss.vo.User#0] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Resolving associations for [com.travelsky.pss.vo.User#1] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Done materializing entity [com.travelsky.pss.vo.User#1] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Resolving associations for [com.travelsky.pss.vo.User#2] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Done materializing entity [com.travelsky.pss.vo.User#2] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Resolving associations for [com.travelsky.pss.vo.User#11] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Done materializing entity [com.travelsky.pss.vo.User#11] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Resolving associations for [com.travelsky.pss.vo.User#66] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Done materializing entity [com.travelsky.pss.vo.User#66] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Resolving associations for [com.travelsky.pss.vo.User#5555] [20160531 16:24:29][http-bio-8080-exec-6][TwoPhaseLoad.doInitializeEntity]Done materializing entity [com.travelsky.pss.vo.User#5555] [20160531 16:24:29][http-bio-8080-exec-6][AbstractPlatformTransactionManager.processCommit]Initiating transaction commit [20160531 16:24:29][http-bio-8080-exec-6][JpaTransactionManager.doCommit]Committing JPA transaction on EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@18c53c] [20160531 16:24:29][http-bio-8080-exec-6][AbstractTransactionImpl.commit]committing [20160531 16:24:29][http-bio-8080-exec-6][JdbcTransaction.doCommit]committed JDBC Connection [20160531 16:24:29][http-bio-8080-exec-6][JdbcTransaction.releaseManagedConnection]re-enabling autocommit [20160531 16:24:29][http-bio-8080-exec-6][JpaTransactionManager.doCleanupAfterCompletion]Closing JPA EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@18c53c] after transaction [20160531 16:24:29][http-bio-8080-exec-6][EntityManagerFactoryUtils.closeEntityManager]Closing JPA EntityManager [20160531 16:24:29][http-bio-8080-exec-6][LogicalConnectionImpl.releaseConnection]Releasing JDBC connection [20160531 16:24:29][http-bio-8080-exec-6][LogicalConnectionImpl.releaseConnection]Released JDBC connection [20160531 16:24:29][http-bio-8080-exec-6][Segment.put]put added 0 on heap put [20160531 16:24:29][http-bio-8080-exec-6][DispatcherServlet.render]Rendering view [org.springframework.web.servlet.view.JstlView: name ‘count‘; URL [/WEB-INF/jsp/count.jsp]] in DispatcherServlet with name ‘web-practice‘ [20160531 16:24:29][my%0043ache.data][Segment.fault]fault removed 0 from heap [20160531 16:24:29][my%0043ache.data][Segment.fault]fault added 0 on disk [20160531 16:24:29][http-bio-8080-exec-6][AbstractView.exposeModelAsRequestAttributes]Added model object ‘number‘ of type [java.lang.Integer] to request in view with name ‘count‘ [20160531 16:24:29][http-bio-8080-exec-6][InternalResourceView.renderMergedOutputModel]Forwarding to resource [/WEB-INF/jsp/count.jsp] in InternalResourceView ‘count‘ [20160531 16:24:29][http-bio-8080-exec-6][FrameworkServlet.processRequest]Successfully completed request
??? 可以看到，在缓存失效后，重新查询了数据库，当你再次刷新页面
Tue May 31 16:26:40 CST 2016 缓存测试 User的数量: 6
? eclipse控制台
[20160531 16:26:40][http-bio-8080-exec-8][DispatcherServlet.doService]DispatcherServlet with name ‘web-practice‘ processing GET request for [/ehcache/userController/coutUserNum.action] [20160531 16:26:40][http-bio-8080-exec-8][AbstractHandlerMethodMapping.getHandlerInternal]Looking up handler method for path /userController/coutUserNum.action [20160531 16:26:40][http-bio-8080-exec-8][AbstractHandlerMethodMapping.getHandlerInternal]Returning handler method [public org.springframework.web.servlet.ModelAndView com.travelsky.pss.controller.UserController.coutUserNum()] [20160531 16:26:40][http-bio-8080-exec-8][AbstractBeanFactory.doGetBean]Returning cached instance of singleton bean ‘userController‘ [20160531 16:26:40][http-bio-8080-exec-8][DispatcherServlet.doDispatch]Last-Modified value for [/ehcache/userController/coutUserNum.action] is: -1 [20160531 16:26:40][http-bio-8080-exec-8][DispatcherServlet.render]Rendering view [org.springframework.web.servlet.view.JstlView: name ‘count‘; URL [/WEB-INF/jsp/count.jsp]] in DispatcherServlet with name ‘web-practice‘ [20160531 16:26:40][http-bio-8080-exec-8][AbstractView.exposeModelAsRequestAttributes]Added model object ‘number‘ of type [java.lang.Integer] to request in view with name ‘count‘ [20160531 16:26:40][http-bio-8080-exec-8][InternalResourceView.renderMergedOutputModel]Forwarding to resource [/WEB-INF/jsp/count.jsp] in InternalResourceView ‘count‘ [20160531 16:26:40][http-bio-8080-exec-8][FrameworkServlet.processRequest]Successfully completed request
? 发现并没有操作数据库的日志打印出来，因为这个时候直接从缓存获取了。
?
? 项目源码下载：亲测可用
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springmvc+spring+spring data jpa + ehcache环境搭建
原文：http://090508tanjie.iteye.com/blog/2308477