java架构搭建（八）--EhCache缓存在web下的使用实例

以前对EhCache做过api的学习与测试，api就不多讲了，这次把在web下如何使用EhCache以及出现的问题说一下。

同时这篇还写了EhCache的监听。

在web下使用缓存，就是把常用的变动很少的数据放入缓存提高查询效率。如果需要查看实时的数据，需要把缓存清空再查询。

比如有一张字典表，定义了整个工程使用到了配置信息，这个基本上是不变的，所以可以用缓存来提高查询效率。

Dictionary，值得注意的是要实现Serializable接口，因为缓存可能要往硬盘写对象。

package org.base.common.dictionary.bean;import java.io.Serializable;import java.util.Date;/** * 公用的字典表对象 * @author lushuaiyin * */public class Dictionary  implements Serializable{/** * 需要implements Serializable，因为ehcache需要往硬盘写对象 */private static final long serialVersionUID = 1L;private String id;private String code_no;private String code_name;private String code_parent_no;private int show_order;private Date create_time;private String remark;private String create_user;private String valid;private String bak1;private String bak2;private String bak3;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getCode_no() {return code_no;}public void setCode_no(String code_no) {this.code_no = code_no;}public String getCode_name() {return code_name;}public void setCode_name(String code_name) {this.code_name = code_name;}public String getCode_parent_no() {return code_parent_no;}public void setCode_parent_no(String code_parent_no) {this.code_parent_no = code_parent_no;}public int getShow_order() {return show_order;}public void setShow_order(int show_order) {this.show_order = show_order;}public Date getCreate_time() {return create_time;}public void setCreate_time(Date create_time) {this.create_time = create_time;}public String getRemark() {return remark;}public void setRemark(String remark) {this.remark = remark;}public String getCreate_user() {return create_user;}public void setCreate_user(String create_user) {this.create_user = create_user;}public String getValid() {return valid;}public void setValid(String valid) {this.valid = valid;}public String getBak1() {return bak1;}public void setBak1(String bak1) {this.bak1 = bak1;}public String getBak2() {return bak2;}public void setBak2(String bak2) {this.bak2 = bak2;}public String getBak3() {return bak3;}public void setBak3(String bak3) {this.bak3 = bak3;}}

同时我定义了一个MyCacheObject用于公用的实现了Serializable

package org.base.cache;import java.io.Serializable;import net.sf.ehcache.CacheEntry;import net.sf.ehcache.Element;/** *  * @author lushuaiyin * */public class MyCacheObject implements Serializable{private static final long serialVersionUID = 1L;public Object object;public Object getObject() {return object;}public void setObject(Object object) {this.object = object;}public MyCacheObject(){}public MyCacheObject(Object object){this.object=(Serializable)object;}}

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="ehcache.xsd"         updateCheck="true" monitoring="autodetect"         dynamicConfig="true">        <diskStore path="java.io.tmpdir"/>        <!-- JTA事务配置。class属性若为空，则默认会按照一个顺序寻找TransactionManager对象。              也可以自定义，需要实现接口net.sf.ehcache.transaction.manager.TransactionManagerLookup    -->    <!--    <transactionManagerLookup class="net.sf.ehcache.transaction.manager.DefaultTransactionManagerLookup"                              properties="jndiName=java:/TransactionManager" propertySeparator=";"/>    -->    <!-- CacheManagerEventListener  缓存监听，根据需要自定义监听类-->     <cacheManagerEventListenerFactory class="org.base.cache.MyCacheManagerEventListener" />            <!-- Terracotta服务器集群配置，详细看文档 -->    <!--    <terracottaConfig url="localhost:9510"/>    -->        <defaultCache           maxEntriesLocalHeap="10000"           maxEntriesLocalDisk="20000"           eternal="false"           diskSpoolBufferSizeMB="20"           overflowToDisk="true"           diskPersistent="true"           timeToIdleSeconds="30"           timeToLiveSeconds="30">     <!-- <terracotta/>-->    </defaultCache>    <!--           缓存名为myCommonCache,    这个缓存最多包含10000个元素在内存中，并将    闲置超过5分钟和存在超过10分钟的元素释放。    如果超过10000元素，将溢流到磁盘缓存，并且硬盘缓存最大数量是1000.           硬盘路径是定义的java.io.tmp。    -->    <cache name="myCommonCache"           maxEntriesLocalHeap="500"           maxEntriesLocalDisk="1000"           eternal="false"           diskSpoolBufferSizeMB="20"           timeToIdleSeconds="15"           timeToLiveSeconds="30"           memoryStoreEvictionPolicy="LFU"           transactionalMode="off">        <persistence strategy="localTempSwap"/>    </cache>    <!--            缓存名为sampleCache2。    此缓存在内存中最大元素的数量是1000。            没有设置溢出到磁盘，所以1000就是这个缓存的最大值。            注意，当一个缓存eternal设置成true，那么TimeToLive    和timeToIdle江不起作用。        <cache name="sampleCache2"           maxEntriesLocalHeap="1000"           eternal="true"           memoryStoreEvictionPolicy="FIFO"/>-->    <!--            缓存名为sampleCache3的。           这个缓存溢出会到磁盘。磁盘缓存存储在虚拟机重新启动前会持久有效。           磁盘的终止线程的时间间隔设置为3分钟，覆盖默认的2分钟。         <cache name="sampleCache3"           maxEntriesLocalHeap="500"           eternal="false"           overflowToDisk="true"           diskPersistent="true"           timeToIdleSeconds="300"           timeToLiveSeconds="600"           diskExpiryThreadIntervalSeconds="180"           memoryStoreEvictionPolicy="LFU">    </cache>-->        </ehcache>

缓存管理类MyEhcacheManager

package org.base.cache;import java.io.Serializable;import java.net.URL;import java.util.List;import org.base.cache.dao.MyEhcacheDao;import net.sf.ehcache.Cache;import net.sf.ehcache.CacheEntry;import net.sf.ehcache.CacheManager;import net.sf.ehcache.Element;import net.sf.ehcache.Status;/** * Ehcache缓存管理在web下的使用实例 * @author lushuaiyin * */public class MyEhcacheManager {public static net.sf.ehcache.CacheManager cacheManager = null;private static String configPath="/ehcache.xml";//配置文件private MyEhcacheDao myEhcacheDao;//查询//缓存定义private static String CACHE_MYCOMMONCACHE="myCommonCache";//定义文件中配置的缓存//缓存中的Element定义private static String ELEMENT_MYCOMMONCACHE_DICTIONARY="dictionaryList";//缓存元素 //实例化cacheManager，单例模式public static CacheManager getCacheManagerInstance(){if (cacheManager == null) {URL configUrl=null;configUrl = MyEhcacheManager.class.getClassLoader().getResource(configPath);cacheManager = CacheManager.create(configUrl);}return cacheManager;}public static net.sf.ehcache.CacheManager getCacheManager() {return getCacheManagerInstance();//单例缓存管理}public static void setCacheManager(net.sf.ehcache.CacheManager cacheManager) {MyEhcacheManager.cacheManager = cacheManager;}//添加新缓存public static void addCacheByName(String cacheName){if(cacheName==null||cacheName.trim().equals("")){System.out.println("cacheName is null");}else{if(getCacheManager().getCache(cacheName.trim())!=null){getCacheManager().removeCache(cacheName.trim());}getCacheManager().addCache(cacheName.trim());System.out.println(cacheName+ "重新添加");}}//得到cache对象public static Cache getCacheByName(String cacheName){Cache cache=null;if(cacheName==null||cacheName.trim().equals("")){System.out.println("cacheName is null");}else{if(getCacheManager().getCache(cacheName.trim())!=null){cache=getCacheManager().getCache(cacheName.trim());}}return cache;}//往缓存中添加元素public static void putElementToCache(String cacheName,String elementKey,Object elementValue){Cache cache=null;if(cacheName==null||cacheName.trim().equals("")){System.out.println("添加缓存元素失败，cacheName is null");}else if(elementKey==null||elementValue==null){System.out.println("添加缓存元素失败，elementKey or elementValue is null");}else{if(getCacheByName(cacheName.trim())!=null){//缓存存在cache=getCacheByName(cacheName.trim());}else{//缓存不存在addCacheByName(cacheName.trim());cache=getCacheByName(cacheName.trim());}//对cache对象添加ElementElement element=null;if(cache.get(elementKey.trim())!=null){cache.remove(elementKey.trim());}element=new Element(elementKey.trim(),elementValue);cache.put(element);System.out.println("添加缓存元素:"+elementKey+"成功！");}}//从缓存中获取指定key的值public static Object getElementValueFromCache(String cacheName,String elementKey){Object result=null;Cache cache=null;if(cacheName==null||cacheName.trim().equals("")){System.out.println("获取缓存元素失败，cacheName is null");}else if(elementKey==null){System.out.println("获取缓存元素失败，elementKey  is null");}else{if(getCacheByName(cacheName.trim())!=null){//缓存存在cache=getCacheByName(cacheName.trim());Element element=null;if(cache.get(elementKey.trim())!=null){element=cache.get(elementKey.trim());if(element.getObjectValue()==null){System.out.println("缓存中"+elementKey+" 的值为空.");}else{result=element.getObjectValue();}}else{System.out.println("缓存中"+elementKey+" 的Element值为空.");}}else{//缓存不存在System.out.println("获取缓存元素失败，缓存"+cacheName+" 为空.");}}return result;}/** * 把所有cache中的内容删除，但是cache对象还是保留. * Clears the contents of all caches in the CacheManager, *  but without removing any caches. */public static void clearAllFromCacheManager(){if(getCacheManager()!=null){getCacheManager().clearAll();System.out.println("CacheManager was clearAll...");}} /** * 把所有cache对象都删除。慎用！ * Removes all caches using removeCache(String) for each cache. */public static void removalAllFromCacheManager(){if(getCacheManager()!=null){getCacheManager().removalAll();System.out.println("CacheManager was removalAll...");}} //不用缓存时，要关闭，不然会占用cpu和内存资源。public static void shutdownCacheManager(){if(getCacheManager()!=null){getCacheManager().shutdown();System.out.println("CacheManager was shutdown...");}}//打印方法1，为了测试用public static void printCache(Cache cache){System.out.println("缓存状态： "+cache.getStatus().toString());if(cache==null){System.out.println("cache is null,no print info.");}else if(cache.getStatus().toString().equals(Status.STATUS_UNINITIALISED)){System.out.println("缓存状态： 未初始化"+cache.getStatus().toString());}else if(cache.getStatus().toString().equals(Status.STATUS_SHUTDOWN)){System.out.println("缓存状态： 已关闭"+cache.getStatus().toString());}else if(cache.getStatus().toString().equals(Status.STATUS_ALIVE)){if(cache.getKeys().size()==0){System.out.println(cache.getName()+" exits,but no value.");}else{for(int i=0;i<cache.getKeys().size();i++){Object thekey=cache.getKeys().get(i);Object thevalue=cache.get(thekey);System.out.println(cache.getName()+"--"+i+",key:"+thekey.toString()+",value:"+thevalue.toString());}}}}//打印方法2，为了测试用public static void printCacheByName(String cacheName){if(cacheName==null||cacheName.trim().equals("")){System.out.println("cacheName is null,no print info.");}else{if(getCacheManager().getCache(cacheName.trim())!=null){Cache cache=getCacheManager().getCache(cacheName.trim());printCache(cache);}else{System.out.println(cacheName+" --null");}}}public static void main(String[] sdfsf){Cache cache1=MyEhcacheManager.getCacheByName(MyEhcacheManager.CACHE_MYCOMMONCACHE);printCache(cache1);MyEhcacheManager.putElementToCache(MyEhcacheManager.CACHE_MYCOMMONCACHE, "111", "111haah");MyEhcacheManager.putElementToCache(MyEhcacheManager.CACHE_MYCOMMONCACHE, "222", "222haah");MyEhcacheManager.putElementToCache(MyEhcacheManager.CACHE_MYCOMMONCACHE, "333", "333haah");printCache(cache1);MyEhcacheManager.putElementToCache(MyEhcacheManager.CACHE_MYCOMMONCACHE, "111", "111的新值。");System.out.println(MyEhcacheManager.getElementValueFromCache(MyEhcacheManager.CACHE_MYCOMMONCACHE, "111"));printCache(cache1);clearAllFromCacheManager();printCache(cache1);removalAllFromCacheManager();printCache(cache1);shutdownCacheManager();}/*打印缓存状态： STATUS_ALIVE添加缓存元素:111成功！添加缓存元素:222成功！添加缓存元素:333成功！缓存状态： STATUS_ALIVE添加缓存元素:111成功！111的新值。缓存状态： STATUS_ALIVECacheManager was clearAll...缓存状态： STATUS_ALIVECacheManager was removalAll...缓存状态： STATUS_SHUTDOWNCacheManager was shutdown... */public MyEhcacheDao getMyEhcacheDao() {return myEhcacheDao;}public void setMyEhcacheDao(MyEhcacheDao myEhcacheDao) {this.myEhcacheDao = myEhcacheDao;}    ///////////////////上面是对缓存操作的Demo，实际使用逻辑需要改变 ////////////////////////////////////////////////////////以下是web环境下对字典表的缓存操作///////////////////////////////////////得到字典表cache对象（"myCommonCache"）public Cache getMyCommonCache(){Cache cache=null;if(getCacheManager().getCache(MyEhcacheManager.CACHE_MYCOMMONCACHE)!=null){cache=getCacheManager().getCache(MyEhcacheManager.CACHE_MYCOMMONCACHE);}else{//如果缓存没有了，这里直接添加，因为在实际中我们不可能告诉应用没有了这个缓存就返回了。//而是应该先去查数据，放入缓存，然后再从缓存中取数据。//当然，如果缓存有数据，那就直接取数据就行了。getCacheManager().addCache(MyEhcacheManager.CACHE_MYCOMMONCACHE);}return cache;}//从mycommon缓存中获取字典表数据(这里只是简单的把所有值取出来了，实际应用可以更加细化)public List getDictionaryListFromMyCommonCache(String codeNo){codeNo=(codeNo==null||codeNo.trim().equals(""))?"":codeNo.trim();List dictionaryList=null;Cache cache=getMyCommonCache();//字典表公用缓存Element element=null;if(cache.get(MyEhcacheManager.ELEMENT_MYCOMMONCACHE_DICTIONARY)!=null){element=cache.get(MyEhcacheManager.ELEMENT_MYCOMMONCACHE_DICTIONARY);if(element.getObjectValue()==null){//值为空，需要从新添加到缓存List list=this.getMyEhcacheDao().querydictionaryByCodeNo(codeNo);//查询if(list!=null){MyCacheObject myCacheObject = new MyCacheObject(list);element=new Element((Serializable)MyEhcacheManager.ELEMENT_MYCOMMONCACHE_DICTIONARY,(Serializable)myCacheObject);//java.io.NotSerializableException:cache.put(element);System.out.println("缓存中的字典表元素为空，重新查询添加..");}dictionaryList=list;}else{//有值MyCacheObject myObj=(MyCacheObject)element.getObjectValue();dictionaryList=(List)myObj.getObject();System.out.println("缓存中存在字典表数据，直接获取到。");}}else{//获取Element空，需要从新添加到缓存List list=this.getMyEhcacheDao().querydictionaryByCodeNo("");//查询if(list!=null){MyCacheObject myCacheObject = new MyCacheObject(list);element=new Element((Serializable)MyEhcacheManager.ELEMENT_MYCOMMONCACHE_DICTIONARY,(Serializable)myCacheObject);cache.put(element);System.out.println("缓存中的字典表元素为空，重新查询添加......");}dictionaryList=list;}return dictionaryList;}/** * 有时需要强制从数据库查询最新的实际数据，所以需要刷新缓存,保证数据的实时性。 * 这里的刷新是指把缓存中所有Element清除 */public void refreshDictionaryListInMyCommonCache(){Cache cache=getMyCommonCache();//字典表公用缓存Element element=null;if(cache.get(MyEhcacheManager.ELEMENT_MYCOMMONCACHE_DICTIONARY)!=null){for(int i=0;i<cache.getKeys().size();i++){cache.remove(cache.getKeys().get(i));}}//如果某些缓存刷新后需要马上填充，就可以像下面直接放数据//if(this.getMyEhcacheDao().querydictionaryByCodeNo("")!=null){//List list=this.getMyEhcacheDao().querydictionaryByCodeNo("");//查询//MyCacheObject myCacheObject = new MyCacheObject(list);//element=new Element((Serializable)MyEhcacheManager.ELEMENT_MYCOMMONCACHE_DICTIONARY,(Serializable)myCacheObject);//cache.put(element);//System.out.println("已经强制刷新字典表缓存。。。");//}System.out.println("已经强制清空字典表所有缓存。。。");}///////////////////////////////////////////////////////////////////////////////}

监听类MyCacheManagerEventListener

package org.base.cache;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Properties;import net.sf.ehcache.CacheException;import net.sf.ehcache.CacheManager;import net.sf.ehcache.Status;import net.sf.ehcache.event.CacheManagerEventListener;import net.sf.ehcache.event.CacheManagerEventListenerFactory;/** * ehcache监听自定义 * @author lushuaiyin * */public class MyCacheManagerEventListener  extends CacheManagerEventListenerFactory implements CacheManagerEventListener{private static MyCacheManagerEventListener myCacheManagerEventListener=null;public static MyCacheManagerEventListener getInstance(){if(myCacheManagerEventListener==null){myCacheManagerEventListener=new MyCacheManagerEventListener();}return myCacheManagerEventListener;}public void dispose() throws CacheException {// TODO Auto-generated method stubSystem.out.println("CacheManager was disposed.."+getTimeNow()+"(MyCacheManagerEventListener)");}public Status getStatus() {// TODO Auto-generated method stubreturn null;}public void init() throws CacheException {// TODO Auto-generated method stubSystem.out.println("CacheManager was inited.."+getTimeNow()+"(MyCacheManagerEventListener)");}public void notifyCacheAdded(String s) {// TODO Auto-generated method stubSystem.out.println(s+" was added.."+getTimeNow()+"(MyCacheManagerEventListener)");}public void notifyCacheRemoved(String s) {// TODO Auto-generated method stubSystem.out.println(s+" was removed.."+getTimeNow()+"(MyCacheManagerEventListener)");}@Overridepublic CacheManagerEventListener createCacheManagerEventListener(CacheManager cachemanager, Properties properties) {// TODO Auto-generated method stubreturn getInstance();}public static String getTimeNow(){Date dd=new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return sdf.format(dd);}}

查询数据的公用dao

MyEhcacheDao

package org.base.cache.dao;import java.util.List;public interface MyEhcacheDao {public List querydictionaryByCodeNo(String codeNo);}

MyEhcacheDaoImpl

package org.base.cache.dao.impl;import java.util.ArrayList;import java.util.List;import org.base.MyHibernateDao;import org.base.cache.dao.MyEhcacheDao;public class MyEhcacheDaoImpl  extends MyHibernateDao implements MyEhcacheDao {public List querydictionaryByCodeNo(String codeNo){List list=new ArrayList();if(codeNo==null||codeNo.trim().equals("")){System.out.println("参数codeNo为空，查询所有值。");String hql="select d from Dictionary d ";list=this.queryListHql(hql);}else{String hql="select d from Dictionary d where d.code_no like '"+codeNo.trim()+"%'";list=this.queryListHql(hql);}return list;}}

spring配置context_mycache.xml，注意除了dao的注入，还需要org.base.cache.MyEhcacheManager的注入，

org.base.cache.MyEhcacheManager在大多数情况其实相当于做了dao的代理。

<?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:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">    <bean id="myEhcacheDaoTarget" class="org.base.cache.dao.impl.MyEhcacheDaoImpl"><property name="sessionFactory"><ref bean="sessionFactory"/></property></bean><bean id="myEhcacheDao" parent="transactionProxyTemplate"><property name="target" ref="myEhcacheDaoTarget" /><property name="proxyInterfaces"><value>org.base.cache.dao.MyEhcacheDao</value></property></bean><!-- myEhcacheManager实现注入，供其他地方调用 --><bean id="myEhcacheManager" class="org.base.cache.MyEhcacheManager"><property name="myEhcacheDao"><ref bean="myEhcacheDao"/></property></bean></beans>

///////////////////////////////////////////////////以下是对公用配置表的一个查询实例////////////////////////////////////////////////////////////////

DictionaryAction

package org.base.common.dictionary.action;import java.util.List;import org.base.MyBaseAction;import org.base.cache.MyEhcacheManager;/** * 字典表缓存实例 * @author lushuaiyin * */public class DictionaryAction  extends MyBaseAction {private static final long serialVersionUID = 1L;private MyEhcacheManager myEhcacheManager;public String execute() throws Exception{return SUCCESS;}//查询字典表数据（注意缓存是怎么使用的）public String queryDictionary() throws Exception{String codeNo="";if(this.getValueFromRequest("codeNo")!=null){codeNo=(String)this.getValueFromRequest("codeNo");}//数据的查询通过缓存来获取List list=this.getMyEhcacheManager().getDictionaryListFromMyCommonCache(codeNo);this.setValueToRequest("dictionaryList", list);return SUCCESS;}//刷新字典表缓存public String refreshDictionaryInCache() throws Exception{this.getMyEhcacheManager().refreshDictionaryListInMyCommonCache();this.getPrintWriter().println("字典表缓存已刷新！");return NONE;}public MyEhcacheManager getMyEhcacheManager() {return myEhcacheManager;}public void setMyEhcacheManager(MyEhcacheManager myEhcacheManager) {this.myEhcacheManager = myEhcacheManager;}}

struts_dictionary.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"><struts><package name="dictionary" extends="base-struts-default" namespace="/dictionary">    <!-- 首页 --><action name="queryDictionary" class="org.base.common.dictionary.action.DictionaryAction" method="queryDictionary">   <result name="success">/jsp/dictionary/dictionary_list.jsp</result></action><action name="refreshDictionaryInCache" class="org.base.common.dictionary.action.DictionaryAction" method="refreshDictionaryInCache"></action></package></struts>

dictionary_list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"%><%@ taglib prefix="s" uri="/struts-tags"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%@ page import="java.util.*"%><%@page import="java.text.*"%><%@ page import="org.base.common.dictionary.bean.Dictionary"%><% String path = request.getContextPath();%><% List list=null;if(request.getAttribute("dictionaryList")!=null){list=(List)request.getAttribute("dictionaryList");}%><html><head>    <meta name="author" content="lushuaiyin">    <meta name="description" content="http://blog.csdn.net/lushuaiyin">    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>uploadFile</title><link rel="stylesheet" type="text/css" href="<%=path%>/resource/css/table.css" /><script src="<%=path%>/script/jquery-1.7.1.min.js" type="text/javascript"></script></head><body><input type="hidden" value="<%=path%>" id="path"><table  align="center" width="80%" class="table2">          <tr>    <td><input type="text" value="" id="codeNo"/></td>  </tr>   <tr>    <td><input type="button" value="查询" onclick="chaxun()"/></td>    <td><input type="button" value="刷新缓存" onclick="refreshcache()"/></td>  </tr></table><table id="mytable1" align="center" width="80%" class="table1">  <tr>    <th>code_no</th>    <th>code_name</th>    <th>create_time</th>    <th>create_user</th>  </tr>  <%   if(list!=null){      for(int i=0;i<list.size();i++){      Dictionary vo=(Dictionary)list.get(i);      String code_no="",code_name="",create_time="",create_user="";      code_no=vo.getCode_no()==null?"":vo.getCode_no().trim();      code_name=vo.getCode_name()==null?"":vo.getCode_name().trim();            Date date=vo.getCreate_time();  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  create_time=sdf.format(date);    create_user=vo.getCreate_user()==null?"":vo.getCreate_user().trim();     if(i%2==0){     %>  <tr class="interval">   <td><%=code_no%></td>    <td><%=code_name%></td>    <td><%=create_time%></td>    <td><%=create_user%></td>  </tr>          <%      }else{     %>   <tr>    <td><%=code_no%></td>    <td><%=code_name%></td>    <td><%=create_time%></td>    <td><%=create_user%></td>  </tr>      <%     }       }  }  %></table></body></html><script type="text/javascript">var path=document.getElementById("path").value;function chaxun(){var codeNo=document.getElementById("codeNo").value;var url=path+"/dictionary/queryDictionary.action?codeNo="+codeNo;window.location.href=url;}function refreshcache(){var url=path+"/dictionary/refreshDictionaryInCache.action";$.ajax({   type: "POST",   url: url,   success: callbackrefreshcache});}function callbackrefreshcache(data){alert(data);window.location.reload();}</script>

///////////////////////////////////////////////////////测试打印////////////////////////////////////////////////////////

2013-5-1 15:26:29 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.6.0_06\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Java\jdk1.6.0_06\jre\bin;C:/Program Files/Java/jre1.6.0_06/bin/client;C:/Program Files/Java/jre1.6.0_06/bin;C:/Program Files/Java/jre1.6.0_06/lib/i386;D:\app\lushuaiyin\product\11.2.0\client_1\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Java\jdk1.6.0_06\bin;C:\Program Files\TortoiseSVN\bin;D:\MySql\bin;C:\Program Files\QuickTime\QTSystem\;C:\Windows\System32;C:\Program Files\VanDyke Software\Clients\;D:\ChinaDevelopmentBankAct\eclipse;
2013-5-1 15:26:30 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2013-5-1 15:26:30 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 674 ms
2013-5-1 15:26:30 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2013-5-1 15:26:30 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.35
2013-5-1 15:26:30 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor frame.xml
2013-5-1 15:26:30 org.apache.catalina.loader.WebappClassLoader validateJarFile
信息: validateJarFile(D:\ChinaDevelopmentBankAct\workSpace\frame\webapp\WEB-INF\lib\servlet-api-2.5.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
2013-5-1 15:26:31 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring root WebApplicationContext
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
CacheManager was inited..2013-05-01 15:26:34(MyCacheManagerEventListener)
myCommonCache was added..2013-05-01 15:26:35(MyCacheManagerEventListener)
2013-5-1 15:26:39 org.activiti.engine.impl.ProcessEngineImpl <init>
信息: ProcessEngine default created
 TestServlet init---
2013-5-1 15:26:42 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor host-manager.xml
2013-5-1 15:26:42 org.apache.catalina.startup.HostConfig deployDescriptor
信息: Deploying configuration descriptor manager.xml
2013-5-1 15:26:42 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory docs
2013-5-1 15:26:42 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory examples
2013-5-1 15:26:42 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2013-5-1 15:26:42 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2013-5-1 15:26:42 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2013-5-1 15:26:42 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2013-5-1 15:26:42 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/44  config=null
2013-5-1 15:26:42 org.apache.catalina.startup.Catalina start
信息: Server startup in 12418 ms
参数codeNo为空，查询所有值。
Hibernate: select dictionary0_.id as id3_, dictionary0_.code_no as code2_3_, dictionary0_.code_name as code3_3_, dictionary0_.code_parent_no as code4_3_, dictionary0_.show_order as show5_3_, dictionary0_.create_time as create6_3_, dictionary0_.remark as remark3_, dictionary0_.create_user as create8_3_, dictionary0_.valid as valid3_, dictionary0_.bak1 as bak10_3_, dictionary0_.bak2 as bak11_3_, dictionary0_.bak3 as bak12_3_ from LSY_DICTIONARY dictionary0_
缓存中的字典表元素为空，重新查询添加......
缓存中存在字典表数据，直接获取到。
参数codeNo为空，查询所有值。
Hibernate: select dictionary0_.id as id3_, dictionary0_.code_no as code2_3_, dictionary0_.code_name as code3_3_, dictionary0_.code_parent_no as code4_3_, dictionary0_.show_order as show5_3_, dictionary0_.create_time as create6_3_, dictionary0_.remark as remark3_, dictionary0_.create_user as create8_3_, dictionary0_.valid as valid3_, dictionary0_.bak1 as bak10_3_, dictionary0_.bak2 as bak11_3_, dictionary0_.bak3 as bak12_3_ from LSY_DICTIONARY dictionary0_
缓存中的字典表元素为空，重新查询添加......
已经强制清空字典表所有缓存。。。
参数codeNo为空，查询所有值。
Hibernate: select dictionary0_.id as id3_, dictionary0_.code_no as code2_3_, dictionary0_.code_name as code3_3_, dictionary0_.code_parent_no as code4_3_, dictionary0_.show_order as show5_3_, dictionary0_.create_time as create6_3_, dictionary0_.remark as remark3_, dictionary0_.create_user as create8_3_, dictionary0_.valid as valid3_, dictionary0_.bak1 as bak10_3_, dictionary0_.bak2 as bak11_3_, dictionary0_.bak3 as bak12_3_ from LSY_DICTIONARY dictionary0_
缓存中的字典表元素为空，重新查询添加......






操作步骤说明：


第一次查询打印：
参数codeNo为空，查询所有值。
Hibernate: select dictionary0_.id as id3_, dictionary0_.code_no as code2_3_, dictionary0_.code_name as code3_3_, dictionary0_.code_parent_no as code4_3_, dictionary0_.show_order as show5_3_, dictionary0_.create_time as create6_3_, dictionary0_.remark as remark3_, dictionary0_.create_user as create8_3_, dictionary0_.valid as valid3_, dictionary0_.bak1 as bak10_3_, dictionary0_.bak2 as bak11_3_, dictionary0_.bak3 as bak12_3_ from LSY_DICTIONARY dictionary0_
缓存中的字典表元素为空，重新查询添加......






第二次查询打印：
缓存中存在字典表数据，直接获取到。






等待60秒以后，缓存已经过期，再查询，打印：
参数codeNo为空，查询所有值。
Hibernate: select dictionary0_.id as id3_, dictionary0_.code_no as code2_3_, dictionary0_.code_name as code3_3_, dictionary0_.code_parent_no as code4_3_, dictionary0_.show_order as show5_3_, dictionary0_.create_time as create6_3_, dictionary0_.remark as remark3_, dictionary0_.create_user as create8_3_, dictionary0_.valid as valid3_, dictionary0_.bak1 as bak10_3_, dictionary0_.bak2 as bak11_3_, dictionary0_.bak3 as bak12_3_ from LSY_DICTIONARY dictionary0_
缓存中的字典表元素为空，重新查询添加......


强制刷新缓存打印：
已经强制清空字典表所有缓存。。。
参数codeNo为空，查询所有值。
Hibernate: select dictionary0_.id as id3_, dictionary0_.code_no as code2_3_, dictionary0_.code_name as code3_3_, dictionary0_.code_parent_no as code4_3_, dictionary0_.show_order as show5_3_, dictionary0_.create_time as create6_3_, dictionary0_.remark as remark3_, dictionary0_.create_user as create8_3_, dictionary0_.valid as valid3_, dictionary0_.bak1 as bak10_3_, dictionary0_.bak2 as bak11_3_, dictionary0_.bak3 as bak12_3_ from LSY_DICTIONARY dictionary0_
缓存中的字典表元素为空，重新查询添加......








注意我们定义的MyCacheManagerEventListener也正确打印了：
CacheManager was inited..2013-05-01 15:26:34(MyCacheManagerEventListener)
myCommonCache was added..2013-05-01 15:26:35(MyCacheManagerEventListener)