ehcache 缓存管理工具

ehcache 

ehcache.xml

<ehcache> 
 <diskStore path="java.io.tmpdir" /> 
 <defaultCache maxElementsInMemory="10000" eternal="false" 
  timeToIdleSeconds="1800" timeToLiveSeconds="1800" 
  overflowToDisk="false" /> 
 <cache name="shortcache" maxElementsInMemory="10000" eternal="false" 
  overflowToDisk="false" timeToIdleSeconds="600" 
  timeToLiveSeconds="600" /> 
 <cache name="middlecache" maxElementsInMemory="50000" 
  eternal="false" overflowToDisk="false" timeToIdleSeconds="1800" 
  timeToLiveSeconds="1800" /> 
 <cache name="longcache" maxElementsInMemory="10000" eternal="false" 
  overflowToDisk="false" timeToIdleSeconds="3600" 
  timeToLiveSeconds="3600" /> 
 <cache name="morelongcache" maxElementsInMemory="50000" 
  eternal="false" overflowToDisk="false" timeToIdleSeconds="864000" 
  timeToLiveSeconds="864000" /> 
</ehcache> 

web.xml 配置监听 

<listener> 
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
 </listener> 
    <listener> 
        <listener-class>com.dadi.oa.init.InitListener</listener-class> 
  </listener>

InitListener 类  监听初始化类

package com.dadi.oa.init; 
import java.util.ArrayList; 
import java.util.List; 
import javax.servlet.ServletContextEvent; 
import javax.servlet.ServletContextListener; 
public class InitListener implements ServletContextListener { 
 private static List<InitHandler> initHandlerList=new ArrayList<InitHandler>(); 
 static { 
  initHandlerList.add(new InitEhcacheHandler()); 
 } 
  
 public void contextDestroyed(ServletContextEvent arg0) { 
  // TODO Auto-generated method stub 
   
 } 
 public void contextInitialized(ServletContextEvent servletContextEvent) { 
  if (initHandlerList != null && initHandlerList.size() > 0) { 
   for (InitHandler initHandler : initHandlerList) { 
    try { 
     initHandler.init(servletContextEvent.getServletContext()); 
    } catch (RuntimeException e) { 
      
     e.printStackTrace(); 
    } 
   } 
  } 
   
 } 
} 

InitHandler 接口 初始化接口

package com.dadi.oa.init; 
import javax.servlet.ServletContext; 
public interface InitHandler { 
 public void init(ServletContext servletContext); 
} 

InitEhcacheHandler 类    ehcache初始化类实现初始化接口

package com.dadi.oa.init; 
import java.io.File; 
import javax.servlet.ServletContext; 
import com.dadi.oa.util.CacheFactory; 
import net.sf.ehcache.CacheManager; 
public class InitEhcacheHandler implements InitHandler { 
 public void init(ServletContext servletContext) { 
  String realpath = servletContext.getRealPath("/WEB-INF/ehcache.xml").replace('/',File.separatorChar); 
  CacheManager cacheManager = new CacheManager(realpath); 
  CacheFactory.setCacheManager(cacheManager); 
 } 
} 

CacheFactory  类   获取各类缓存  

package com.dadi.oa.util; 
import net.sf.ehcache.Cache; 
import net.sf.ehcache.CacheManager; 
import org.apache.commons.lang.StringUtils; 
public class CacheFactory { 
 private  static CacheManager cacheManager ; 
  
 public static Cache getCacheByName(String cachename) { 
  if (StringUtils.isEmpty(cachename)) { 
   System.out.println("cachename must be not empty"); 
   return null; 
  } 
  Cache cache = cacheManager.getCache(cachename); 
  if (cache == null) { 
   System.out.println("no cache named : " + cachename + "has defined. "); 
   return null; 
  } 
  return cache; 
 } 
    /** 
     *<pre><cache name="cachekey" maxElementsInMemory="50000" 
     eternal="false" overflowToDisk="false" timeToIdleSeconds="864000" 
     timeToLiveSeconds="864000" /></pre> 
     功能：获取cache，不存在时，自动创建，options为可选配置参数 
     * @param options [memory,liveSeconds, idleSeconds] 
     * @param cacheName 
     * @return 
     */ 
    public static Cache getCache(String cacheName,int...options) { 
        int memory=10000, liveSeconds=864000, idleSeconds=864000;//shortcache 
        if (options!=null&&options.length>0) { 
            memory = options[0]; 
            liveSeconds=options.length>1?options[1]:liveSeconds; 
            idleSeconds=options.length>2?options[1]:idleSeconds; 
        } 
        Cache cache = getCacheByName(cacheName); 
        if(cache==null){ 
            cache = new Cache(cacheName, memory, false, false, liveSeconds, idleSeconds); 
            cacheManager.addCache(cache); 
            System.out.println("the cache " + cacheName + " has created dynamically. "); 
        } 
        return cache; 
    } 
 public synchronized static void setCacheManager(CacheManager cacheManager) { 
  CacheFactory.cacheManager = cacheManager; 
 } 
} 

使用ehcahe

 

/** 
   * 获取公文证明列表 
   * @param mapping 
   * @param form 
   * @param request 
   * @param response 
   * @return 
   * @throws Exception 
   */ 
  public ActionForward provelist(ActionMapping mapping, ActionForm form, 
          HttpServletRequest request, HttpServletResponse response) 
          throws Exception { 
   String msgid = RequestUtil.getRequestInfo(request, "msgid"); 
   String resultList_en_ = RequestUtil.getRequestInfo(request, "resultList_en_"); 
   CommonListVo commonListVo = CacheFactory.getCache("shortcache").get("commonListVo"+msgid) == null  
     ? null : 
//获取缓存
(CommonListVo)BeanUtils.cloneBean(CacheFactory.getCache("shortcache").get("commonListVo"+msgid).getObjectValue());   
   if(null !=resultList_en_ && resultList_en_.equalsIgnoreCase("output.xls")){ 
    logger.info("---------------prove list execl export .......-----------"); 
   // modfiedExportData(commonListVo.getDataList()); 
   }else{ 
    logger.info("---------------get prove list begin -----------"); 
    if(null == commonListVo){ 
     Map retMap = oaProveManageService.getUserProveList(msgid); 
     if(retMap.get("resultStr").toString().equalsIgnoreCase("fail")){ 
      request.setAttribute("info", "数据库繁忙,请稍候再试!"); 
      request.setAttribute("closepage", "yes"); 
     } 
     commonListVo = new CommonListVo(); 
     commonListVo.setColumnList((ArrayList)genECColumnsList()); 
     commonListVo.setDataList((ArrayList)retMap.get("provelist")); 
     commonListVo.setExportFlag(true); 
     commonListVo.setActionTo("/oaproverpt.do"); 
     commonListVo.setPagesize(100); 
//设置缓存
     CacheFactory.getCacheByName("shortcache").put(new Element("commonListVo"+msgid, BeanUtils.cloneBean(commonListVo))); 
    } 
    commonListVo.setDataList((ArrayList)genECDataList((List)commonListVo.getDataList(),request.getServerName())); 
    
    logger.info("---------------get prove list end -----------"); 
   } 
   request.setAttribute("commonListVo", commonListVo); 
   return mapping.findForward("success"); 
  }

ehcache jar:

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