Ehcache学习总结三：Ehcache页面缓存

一：需要jar包

1、ehcache-2.10.2.jar

2、ehcache-web-2.0.4.jar

3、slf4j-api-1.5.8.jar

4、slf4j-log4j12-1.5.8.jar

5、log4j-1.2.15.jar

由于我是结合Spring操作，所以还需导入Spring相关包

二：在项目根路径src目录下加入Ehcache配置文件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">

     <!-- 默认缓存 -->
    <defaultCache
           maxElementsInMemory="1000"
           eternal="false"
           timeToIdleSeconds="120"
           timeToLiveSeconds="120"
           overflowToDisk="false"/>  

    <!-- 指定名字缓存缓存 -->
    <cache name="studyCache"
           maxElementsInMemory="1000"
           eternal="false"
           timeToIdleSeconds="120"
           timeToLiveSeconds="120"
           overflowToDisk="false"
           memoryStoreEvictionPolicy="LRU"/> 

      <!-- 指定名字缓存缓存 -->
    <cache name="pageCache"
           maxElementsInMemory="1000"
           eternal="false"
           timeToIdleSeconds="120"
           timeToLiveSeconds="120"
           overflowToDisk="false"
           memoryStoreEvictionPolicy="LRU"/> 

</ehcache>

三：在web.xml中加入Ehcache页面过滤器

<filter>
    <filter-name>CachePageCachingFilter</filter-name>
    <filter-class>net.sf.ehcache.constructs.web.filter.SimplePageCachingFilter</filter-class>
    <init-param>
        <param-name>cacheName</param-name>
        <param-value>pageCache</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>CachePageCachingFilter</filter-name>
    <url-pattern>/pageEhcache/*</url-pattern>
  </filter-mapping>

这样凡是访问路径带 pageEhcache 都会被缓存起来

四：java代码

package com.ehcache.study.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.ehcache.study.beans.TradeBlotter;
import com.ehcache.study.service.IAppTradeBlotterService;

@Scope("prototype")
@Controller
public class IndexCtrl {

    @Autowired
    private IAppTradeBlotterService appTradeBlotterService;

    @RequestMapping("/ehcacheStudy/myTradeBlotter")
    public ModelAndView myTradeBlotter(HttpServletRequest request,HttpServletResponse response,ModelAndView view)throws Exception{
        view.setViewName("/WEB-INF/ehcacheStudy/myTradeBlotter.jsp");

        System.out.println("执行myTradeBlotter方法");

        String appNo = request.getParameter("appNo");
        String opId = request.getParameter("opId");
        String fundAcct = request.getParameter("fundAcct");
        String fundId = request.getParameter("fundId");

        long startTime = System.currentTimeMillis();
        List<TradeBlotter> tradeBlotterList = appTradeBlotterService.qryTradeBlotterList(appNo, opId, fundAcct, fundId);
        long endTime = System.currentTimeMillis(); 

        long excuteTime = endTime-startTime;
        System.out.println("excuteTime=" + excuteTime);

        view.addObject("tradeBlotterList", tradeBlotterList);

        return view;
    }

    @RequestMapping("/pageEhcache/myCachePage")
    public ModelAndView myCachePage(HttpServletRequest request,HttpServletResponse response,ModelAndView view)throws Exception{
        view.setViewName("/WEB-INF/pageEhcache/myCachePage.jsp");

        System.out.println("执行myCachePage方法");

        String appNo = request.getParameter("appNo");
        String opId = request.getParameter("opId");
        String fundAcct = request.getParameter("fundAcct");
        String fundId = request.getParameter("fundId");

        long startTime = System.currentTimeMillis();
        List<TradeBlotter> tradeBlotterList = appTradeBlotterService.qryTradeBlotterList(appNo, opId, fundAcct, fundId);
        long endTime = System.currentTimeMillis(); 

        long excuteTime = endTime-startTime;
        System.out.println("excuteTime=" + excuteTime);

        view.addObject("tradeBlotterList", tradeBlotterList);

        return view;
    }

}

结果：当执行http://localhost:8080/pageEhcache/myCachePage?opId=Mobile11请求时，页面被缓存

五：上面代码已经能够缓存页面了，如果还需结合缓存方法则在Spring配置applicationcontext.xml文件中加入如下代码

<?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:cache="http://www.springframework.org/schema/cache"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-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/mvc
           http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
           http://www.springframework.org/schema/cache
           http://www.springframework.org/schema/cache/spring-cache-3.2.xsd">

    <mvc:annotation-driven/>
    <context:annotation-config/>
    <context:component-scan base-package="com.ehcache.study"/>

    <!-- 数据库配置 -->
    <bean id="dataSourceSales" class="org.apache.commons.dbcp.BasicDataSource" >
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@10.1.50.25:1521:tadev"></property>
        <property name="username" value="fund_sales_dev"></property>
        <property name="password" value="pass4tadev"></property>
        <property name="maxActive" value="100"></property>
        <property name="maxIdle" value="30"></property>
        <property name="maxWait" value="30000"></property>
        <property name="defaultAutoCommit" value="true"></property>
    </bean>

    <!-- sqlSessionFactory -->
    <bean id="sqlSessionFactorySales" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSourceSales"></property>
        <property name="mapperLocations" value="classpath*:com/ehcache/study/dao/**/*.xml"></property>
        <property name="configLocation" value="classpath:MybatisConfig.xml"></property>
    </bean>
    <bean name="salesConfig" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.ehcache.study.dao"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactorySales"></property>
    </bean>

    <!-- 此处为Ehcache相关配置 -->
    <cache:annotation-driven cache-manager="cacheCacheManager"/>
    <bean id="cacheManagerFactory" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
        <property name="configLocation" value="classpath:ehcache.xml" />
        <property name="cacheManagerName" value="myCacheManager"></property>
    </bean>
    <bean id="cacheCacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
        <property name="cacheManager"  ref="cacheManagerFactory"/>
    </bean>

</beans>

此处注意要加上 <property name="cacheManagerName" value="myCacheManager"></property> ，value的值是自己随便定义， 此处如果不写的话会报already exists in the same VM. Please provide unique names for each CacheManager in the config or do one of following 错误

六：service层代码

package com.ehcache.study.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.ehcache.study.beans.TradeBlotter;
import com.ehcache.study.dao.IAppTradeBlotterDao;
import com.ehcache.study.service.IAppTradeBlotterService;

@Service
public class AppTradeBlotterServiceImpl implements IAppTradeBlotterService{

    @Autowired
    private IAppTradeBlotterDao appTradeBlotterDao;

    @Cacheable(value="studyCache")
    public List<TradeBlotter> qryTradeBlotterList(String appNo, String opId,String fundAcct, String fundId) {
        System.out.println("执行查询数据库");
        return appTradeBlotterDao.selectTradeBlotterList(appNo, opId, fundAcct, fundId);
    }

}

以上就是Ehcache页面缓存和方法缓存，仅供参考，如有不当之处，欢迎大家多多指点！