大致思路是用一个单例的Map实现，当然此Map得是线程安全的--ConcurrentHashMap

原本项目需求是缓存十条消息，所以打算用Map实现缓存机制。中途夭折下面具体尚未实现。。。

当然此代码仞为半成品，具体得根据项目需求采用不同的原则清除缓存

1 package per.zww.util; 2  3 import java.util.Map; 4 import java.util.concurrent.ConcurrentHashMap; 5  6 public class CachePool { 7     private static CachePool cachePool; 8     private Map
     
       cacheItems; 9     private CachePool() {10         cacheItems =new ConcurrentHashMap
      
       ();11     }12     /**13      * 获取唯一实例14      * @return instance15      */16     public static CachePool getInstance() {17         if (cachePool ==null) {18             synchronized (CachePool.class) {19                 if (cachePool ==null) {20                     cachePool =new CachePool();21                 }22             }23         }24         return cachePool;25     }26     27     /**28      * 获取所有cache信息29      * @return cacheItems30      */31     public Map
       
         getCacheItems() {32         return this.cacheItems;33     }34     35     /**36      * 清空cache37      */38     public void clearAllItems() {39         cacheItems.clear();40     }41     42     /**43      * 获取指定cache信息44      * @return cacheItem45      */46     public Object getCacheItem(Object key) {47         if (cacheItems.containsKey(key)) {48             return cacheItems.get(key);49         }50         return null;51     }52     53     /**54      * 存放cache信息55      */56     public void putCacheItem(Object key,Object value) {57         if (!cacheItems.containsKey(key)) {58             cacheItems.put(key, value);59         }60     }61     62     /**63      * 删除一个cache64      */65     public void removeCacheItem(Object key) {66         if (cacheItems.containsKey(key)) {67             cacheItems.remove(key);68         }69     }70     71     /**72      * 获取cache长度73      * @return size74      */75     public int getSize() {76         return cacheItems.size();77     }78     79 }