Java Cache System JCS(一) 使用方法
JCS 是JAVA 中缓存的一种实现，支持将数据缓存到内存或硬盘中，支持设置缓存对象的有效时长。使用时需要用到以下几个jar包：commons-collections-2.1.1.jar
commons-lang.2.3.jar
commons-logging-1.0.4.jar
concurrent-1.3.2.jar
jcs-1.3.jar
slf4j-api.jar
定义实现了Serializable 接口的存储对象类：
public class UserInfo implements Serializable{ private String username; private String domain; public UserInfo(String name){ this.username = name; } public UserInfo(String name,String domain){ this.username= name; this.domain =domain; }}
定义存储类：
public class UserManager{ private JCS jcscache; private final String NAME_SPACE="userinfo"; private static class UserManagerContainer{ private static UserManager instance = new UserManager(); } public static UserManager getInstance(){ return UserManagerContainer.instance } private UserManager(){ try{ jcscache= JCS.getInstance(NAME_SPACE); } catch(CacheException e){ } } public UserInfo get(String key){ return (UserInfo) jcscache.get(key); } pubilc void put(String key,UserInfo info,boolean isoverride){ try{ if(isoverride){ jcscache.put(key,info); } else{ jcscache.putSafe(key,info); } } catch(CacheException e){ } }}
定义配置文件：cache.ccf
jcs.default=DCjcs.defaultcacheattributes=org.engine.CompositeCacheAttributesjcs.defaultcacheattributes.MaxObjects=500000jcs.defaultcacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCachejcs.defaultcacheattributes.UseMemoryShrinker=truejcs.defaultcacheattributes.MaxMemoryIdleTimeSeconds=1200jcs.defaultcacheattributes.ShrinkerIntervalSeconds=30jcs.defaultcacheattributes.MaxSpoolPerRun=500jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributesjcs.default.elementattributes.IsEternal=falsejcs.auxiliary.DC=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactoryjcs.auxiliary.DC.attributes=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttributejcs.auxiliary.DC.attributes.DiskPatch=d:/memory
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