OSCache工具种

OSCache工具类
<% @?taglib?uri = " oscache " ?prefix = " cache " %>

< cache:flush?group = " device_types " ?scope = " application " ? />
但是有时需要在java代码中刷新缓存，以下这个OSCacheUtil类可以工作，但是只能在webwork环境内调用：

import?javax.servlet.jsp.PageContext;

import?org.apache.log4j.Logger;
import?com.opensymphony.oscache.base.Cache;
import?com.opensymphony.oscache.web.ServletCacheAdministrator;
import?com.opensymphony.webwork.ServletActionContext;

/**
?*?osCache缓存工具类.
?*?只能在webwork环境内调用
?*
?*?<p>Copyright:?Copyright?(c)?2005</p>
?*?<p>Company:?</p>
?*?@author?杨杰荣
?*?@version?1.0
?*/
public?class?OSCacheUtil
{
??private?static?final?Logger?log?=?Logger.getLogger(?OSCacheUtil.class?);

??public?static?final?int?ALL_SCOPE?=?0;
??public?static?final?int?SESSION_SCOPE?=?PageContext.SESSION_SCOPE;
??public?static?final?int?APPLICATION_SCOPE?=?PageContext.APPLICATION_SCOPE;

??private?static?ServletCacheAdministrator?admin?=?null;

??private?OSCacheUtil()
??{
??}

??/**
???*?刷新osCache组
???*?@param?group?Cache组名
???*?@param?cacheScope?Cache范围，只能是SESSION_SCOPE或APPLICATION_SCOPE
???*/
??public?static?void?flushGroup(?String?group,?int?cacheScope?)
??{
????initCacheAdmin();

????if?(?cacheScope?==?SESSION_SCOPE?||?cacheScope?==?APPLICATION_SCOPE?)
????{
??????Cache?cache?=?admin.getCache(?ServletActionContext.getRequest(),
????????????????????????????????????cacheScope?);
??????cache.flushGroup(?group?);
????}
????else
????{
??????log.warn(?"A?cache?group?was?specified?for?flushing,?but?the?scope?wasn't?supplied?or?was?invalid"?);
????}
??}

??/**
???*?刷新osCache中的某个key'
???*?@param?key?String
???*?@param?cacheScope?Cache范围，只能是SESSION_SCOPE或APPLICATION_SCOPE
???*/
??public?static?void?flushKey(?String?key,?int?cacheScope?)
??{
????initCacheAdmin();

????if?(?cacheScope?==?SESSION_SCOPE?||?cacheScope?==?APPLICATION_SCOPE?)
????{
??????String?actualKey?=?admin.generateEntryKey(
??????????key,?ServletActionContext.getRequest(),?cacheScope,?null?);

??????Cache?cache?=?admin.getCache(?ServletActionContext.getRequest(),?cacheScope?);
??????cache.flushEntry(?actualKey?);
????}
????else
????{
??????log.warn(?"A?cache?key?was?specified?for?flushing,?but?the?scope?wasn't?supplied?or?was?invalid"?);
????}
??}

??/**
???*?刷新所有的osCache
???*?@param?cacheScope?Cache范围，可以是SESSION_SCOPE，APPLICATION_SCOPE，ALL_SCOPE
???*/
??public?static?void?flushAll(?int?cacheScope?)
??{
????initCacheAdmin();

????if?(?cacheScope?==?SESSION_SCOPE?||?cacheScope?==?APPLICATION_SCOPE?)
????{
??????admin.setFlushTime(?cacheScope?);
????}
????else
????{
??????admin.flushAll();
????}
??}


??private?static?void?initCacheAdmin()
??{
????if?(?admin?==?null?)
????{
??????admin?=?ServletCacheAdministrator.getInstance(?ServletActionContext.
??????????getServletContext()?);
????}
??}
官网http://www.opensymphony.com/oscache/api/

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