/** * 缓存池 * @author xiaoquan * @create 2015年3月13日 上午10:32:13 * @see */public class CachePool { private static CachePool instance;//缓存池唯一实例 private static Map<String,Object> cacheItems;//缓存Map private CachePool(){ cacheItems = new HashMap<String,Object>(); } /** * 得到唯一实例 * @return */ public synchronized static CachePool getInstance(){ if(instance == null){ instance = new CachePool(); } return instance; } /** * 清除所有Item缓存 */ public synchronized void clearAllItems(){ cacheItems.clear(); } /** * 获取缓存实体 * @param name * @return */ public synchronized Object getCacheItem(String name){ if(!cacheItems.containsKey(name)){ return null; } CacheItem cacheItem = (CacheItem) cacheItems.get(name); if(cacheItem.isExpired()){ return null; } return cacheItem.getEntity(); } /** * 存放缓存信息 * @param name * @param obj * @param expires */ public synchronized void putCacheItem(String name,Object obj,long expires){ if(!cacheItems.containsKey(name)){ cacheItems.put(name, new CacheItem(obj, expires)); } CacheItem cacheItem = (CacheItem) cacheItems.get(name); cacheItem.setCreateTime(new Date()); cacheItem.setEntity(obj); cacheItem.setExpireTime(expires); } public synchronized void putCacheItem(String name,Object obj){ putCacheItem(name,obj,-1); } /** * 移除缓存数据 * @param name */ public synchronized void removeCacheItem(String name){ if(!cacheItems.containsKey(name)){ return; } cacheItems.remove(name); } /** * 获取缓存数据的数量 * @return */ public int getSize(){ return cacheItems.size(); }}public class CacheItem {
private Date createTime = new Date();//创建缓存的时间 private long expireTime = 1;//缓存期满的时间 private Object entity;//缓存的实体 public CacheItem(Object obj,long expires){ this.entity = obj; this.expireTime = expires; } public boolean isExpired(){ return (expireTime != -1 && new Date().getTime()-createTime.getTime() > expireTime); } /** * 省略getter、setter方法 */} |
原文： http://www.cnblogs.com/quanenmin/p/4335278.html
