EHCache工具类

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转载于：http://www.16boke.com

EHCache是一款优秀的缓存框架，关于EHCache的介绍网上已经有很多了，这里分享一份EHCache在实际项目中的使用例子：

package com.avic.smartb.utils;/** *  * @className:EHCacheConfig.java *  */public class EHCacheConfig {/** * 元素最大数量 */public static int MAXELEMENTSINMEMORY = 50000;/** *  * 是否把溢出数据持久化到硬盘 */public static boolean OVERFLOWTODISK = true;/** *  * 是否会死亡 */public static boolean ETERNAL = false;/** *  * 缓存的间歇时间 */public static int TIMETOIDLESECONDS = 600;/** *  * 存活时间(默认一天) */public static int TIMETOlIVESECONDS = 86400;/** *  * 需要持久化到硬盘否 */public static boolean DISKPERSISTENT = false;/** *  * 内存存取策略 */public static String MEMORYSTOREEVICTIONPOLICY = "LFU";}

package com.avic.smartb.utils;import java.util.List;import net.sf.ehcache.Cache;import net.sf.ehcache.CacheManager;import net.sf.ehcache.Element;import net.sf.ehcache.config.CacheConfiguration;import org.apache.commons.lang.StringUtils;/** * ehcache工具类 */public class EHCacheUtil {private static CacheManager cacheManager = null;private static Cache cache = null;static{EHCacheUtil.initCacheManager();EHCacheUtil.initCache("cache");}/** *  * 初始化缓存管理容器 */public static CacheManager initCacheManager() {try {if (cacheManager == null)cacheManager = CacheManager.getInstance();} catch (Exception e) {e.printStackTrace();}return cacheManager;}/** *  * 初始化缓存管理容器 *  * @param path *            ehcache.xml存放的路徑 */public static CacheManager initCacheManager(String path) {try {if (cacheManager == null) {cacheManager = CacheManager.getInstance().create(path);}} catch (Exception e) {e.printStackTrace();}return cacheManager;}/** * 初始化cache */public static Cache initCache(String cacheName) {checkCacheManager();if (null == cacheManager.getCache(cacheName)) {cacheManager.addCache(cacheName);}cache = cacheManager.getCache(cacheName);return cache;}/** *  * 添加缓存 *  * @param key *            关键字 * @param value *            值 */public static void put(Object key, Object value) {checkCache();// 创建Element,然后放入Cache对象中Element element = new Element(key, value);cache.put(element);}/** * 获取cache *  * @param key *            关键字 * @return */public static Object get(Object key) {checkCache();Element element = cache.get(key);if (null == element) {return null;}return element.getObjectValue();}/** * 初始化缓存 *  * @param cacheName *            缓存名称 * @param maxElementsInMemory *            元素最大数量 * @param overflowToDisk *            是否持久化到硬盘 * @param eternal *            是否会死亡 * @param timeToLiveSeconds *            缓存存活时间 * @param timeToIdleSeconds *            缓存的间隔时间 * @return 缓存 * @throws Exception */public static Cache initCache(String cacheName, int maxElementsInMemory, boolean overflowToDisk, boolean eternal,long timeToLiveSeconds, long timeToIdleSeconds) throws Exception {try {CacheManager singletonManager = CacheManager.create();Cache myCache = singletonManager.getCache(cacheName);if (myCache != null) {CacheConfiguration config = cache.getCacheConfiguration();config.setTimeToLiveSeconds(timeToLiveSeconds);config.setMaxElementsInMemory(maxElementsInMemory);config.setOverflowToDisk(overflowToDisk);config.setEternal(eternal);config.setTimeToIdleSeconds(timeToIdleSeconds);}if (myCache == null) {Cache memoryOnlyCache = new Cache(cacheName, maxElementsInMemory, overflowToDisk, eternal, timeToLiveSeconds,timeToIdleSeconds);singletonManager.addCache(memoryOnlyCache);myCache = singletonManager.getCache(cacheName);}return myCache;} catch (Exception e) {throw new Exception("init cache " + cacheName + " failed!!!");}}/** * 初始化cache *  * @param cacheName *            cache的名字 * @param timeToLiveSeconds *            有效时间 * @return cache 缓存 * @throws Exception */public static Cache initCache(String cacheName, long timeToLiveSeconds) throws Exception {return EHCacheUtil.initCache(cacheName, EHCacheConfig.MAXELEMENTSINMEMORY, EHCacheConfig.OVERFLOWTODISK,EHCacheConfig.ETERNAL, timeToLiveSeconds, EHCacheConfig.TIMETOIDLESECONDS);}/** * 初始化Cache *  * @param cacheName *            cache容器名 * @return cache容器 * @throws Exception */public static Cache initMyCache(String cacheName) throws Exception {return EHCacheUtil.initCache(cacheName, EHCacheConfig.TIMETOlIVESECONDS);}/** * 修改缓存容器配置 *  * @param cacheName *            缓存名 * @param timeToLiveSeconds *            有效时间 * @param maxElementsInMemory *            最大数量 * @throws Exception */public static boolean modifyCache(String cacheName, long timeToLiveSeconds, int maxElementsInMemory) throws Exception {try {if (StringUtils.isNotBlank(cacheName) && timeToLiveSeconds != 0L && maxElementsInMemory != 0) {CacheManager myManager = CacheManager.create();Cache myCache = myManager.getCache(cacheName);CacheConfiguration config = myCache.getCacheConfiguration();config.setTimeToLiveSeconds(timeToLiveSeconds);config.setMaxElementsInMemory(maxElementsInMemory);return true;} else {return false;}} catch (Exception e) {throw new Exception("modify cache " + cacheName + " failed!!!");}}/** *  * 向指定容器中设置值 *  * @param vesselName *            容器名 *  * @param key *            键 *  * @param value *            值 *  * @return 返回真 *  * @throws Exception *             异常 */public static boolean setValue(String cacheName, String key, Object value) throws Exception {try {CacheManager myManager = CacheManager.create();Cache myCache = myManager.getCache(cacheName);if (myCache == null) {myCache = initCache(cacheName);}myCache.put(new Element(key, value));return true;} catch (Exception e) {throw new Exception("set cache " + cacheName + " failed!!!");}}/** *  * 向指定容器中设置值 *  * @param cacheName *            容器名 *  * @param key *            键 *  * @param value *            值 *  * @param timeToIdleSeconds *            间歇时间 *  * @param timeToLiveSeconds *            存活时间 *  * @return 真 *  * @throws Exception *             抛出异常 */public static boolean setValue(String cacheName, String key, Object value, Integer timeToLiveSeconds) throws Exception {try {CacheManager myManager = CacheManager.create();Cache myCache = myManager.getCache(cacheName);if (myCache == null) {initCache(cacheName, timeToLiveSeconds);myCache = myManager.getCache(cacheName);}myCache.put(new Element(key, value, EHCacheConfig.ETERNAL, EHCacheConfig.TIMETOIDLESECONDS, timeToLiveSeconds));return true;} catch (Exception e) {throw new Exception("set cache " + cacheName + " failed!!!");}}/** *  * 从ehcache的指定容器中取值 *  * @createTime 2012-4-23 *  * @param key *            键 *  * @return 返回Object类型的值 *  * @throws Exception *             异常 */public static Object getValue(String cacheName, String key) throws Exception {try {CacheManager myManager = CacheManager.create();Cache myCache = myManager.getCache(cacheName);if (myCache == null) {myCache = initMyCache(cacheName);}return myCache.get(key).getValue();} catch (Exception e) {return null;}}/** *  * 删除指定的ehcache容器 *  * @param vesselName *  * @return 真 *  * @throws Exception *             失败抛出异常 */public static boolean removeEhcache(String cacheName) throws Exception {try {CacheManager myManager = CacheManager.create();myManager.removeCache(cacheName);return true;} catch (Exception e) {throw new Exception("remove cache " + cacheName + " failed!!!");}}/** *  * 删除所有的EHCache容器 *  * @param cacheName *            容器名 *  * @return 返回真 *  * @throws Exception *             失败抛出异常 */public static boolean removeAllEhcache(String cacheName) throws Exception {try {CacheManager myManager = CacheManager.create();myManager.removalAll();return true;} catch (Exception e) {throw new Exception("remove cache " + cacheName + " failed!!!");}}/** *  * 删除EHCache容器中的元素 *  * @param cacheName *            容器名 *  * @param key *            键 *  * @return 真 *  * @throws Exception *             失败抛出异常 */public static boolean removeElment(String cacheName, String key) throws Exception {try {CacheManager myManager = CacheManager.create();Cache myCache = myManager.getCache(cacheName);myCache.remove(key);return true;} catch (Exception e) {throw new Exception("remove cache " + cacheName + " failed!!!");}}/** *  * 删除指定容器中的所有元素 *  * @param cacheName *            容器名 *  * @param key *            键 *  * @return 真 *  * @throws Exception *             失败抛出异常 */public static boolean removeAllElment(String cacheName, String key) throws Exception {try {CacheManager myManager = CacheManager.create();Cache myCache = myManager.getCache(cacheName);myCache.removeAll();return true;} catch (Exception e) {throw new Exception("remove cache " + cacheName + " failed!!!");}}/** * 释放CacheManage */public static void shutdown() {cacheManager.shutdown();}/** * 移除cache *  * @param cacheName */public static void removeCache(String cacheName) {checkCacheManager();cache = cacheManager.getCache(cacheName);if (null != cache) {cacheManager.removeCache(cacheName);}}/** * 移除cache中的key *  * @param cacheName */public static void remove(String key) {checkCache();cache.remove(key);}/** * 移除所有cache */public static void removeAllCache() {checkCacheManager();cacheManager.removalAll();}/** *  * 移除所有Element */public static void removeAllKey() {checkCache();cache.removeAll();}/** *  * 获取所有的cache名称 *  * @return */public static String[] getAllCaches() {checkCacheManager();return cacheManager.getCacheNames();}/** *  * 获取Cache所有的Keys *  * @return */public static List getKeys() {checkCache();return cache.getKeys();}/** *  * 检测cacheManager */private static void checkCacheManager() {if (null == cacheManager) {throw new IllegalArgumentException("调用前请先初始化CacheManager值：EHCacheUtil.initCacheManager");}}private static void checkCache() {if (null == cache) {throw new IllegalArgumentException("调用前请先初始化Cache值：EHCacheUtil.initCache(参数)");}}public static void main(String[] arg) {// 初始化--必须EHCacheUtil.initCacheManager();EHCacheUtil.initCache("cache");EHCacheUtil.put("A", "AAAAA");EHCacheUtil.put("B", "BBBBB");EHCacheUtil.put("F", "FFFFF");System.out.println(EHCacheUtil.get("F"));List keys = EHCacheUtil.getKeys();for(int i=0;i<keys.size();i++){System.out.println(keys.get(i));}EHCacheUtil.shutdown();}}

<?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"/>    <defaultCache            maxEntriesLocalHeap="10000"            eternal="true"            timeToIdleSeconds="120"            timeToLiveSeconds="120"            diskSpoolBufferSizeMB="30"            maxEntriesLocalDisk="10000000"            diskExpiryThreadIntervalSeconds="120"            memoryStoreEvictionPolicy="LRU">        <persistence strategy="localTempSwap"/>    </defaultCache>    <cache name="cache"           maxEntriesLocalHeap="10000"           maxEntriesLocalDisk="1000"           eternal="true"           diskSpoolBufferSizeMB="20"           timeToIdleSeconds="300"           timeToLiveSeconds="600"           memoryStoreEvictionPolicy="LFU"           transactionalMode="off">        <persistence strategy="localTempSwap"/>    </cache></ehcache>

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