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=DC

jcs.defaultcacheattributes=org.engine.CompositeCacheAttributes

jcs.defaultcacheattributes.MaxObjects=500000

jcs.defaultcacheattributes.MemoryCacheName=org.apache.jcs.engine.memory.lru.LRUMemoryCache

jcs.defaultcacheattributes.UseMemoryShrinker=true

jcs.defaultcacheattributes.MaxMemoryIdleTimeSeconds=1200

jcs.defaultcacheattributes.ShrinkerIntervalSeconds=30

jcs.defaultcacheattributes.MaxSpoolPerRun=500

jcs.default.elementattributes=org.apache.jcs.engine.ElementAttributes

jcs.default.elementattributes.IsEternal=false

jcs.auxiliary.DC=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory

jcs.auxiliary.DC.attributes=org.apache.jcs.auxiliary.disk.indexed.IndexedDiskCacheAttribute

jcs.auxiliary.DC.attributes.DiskPatch=d:/memory