Ehcache的使用

一、 配置文件ehcache.xml
<ehcache>
<diskStore path="java.io.tmpdir"/>
<defaultCache
maxElementsInMemory="10000"
eternal="false"
overflowToDisk="true"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
diskPersistent="true"/>

<cache name="resourceCache"
maxElementsInMemory="10000"
eternal="false"
overflowToDisk="true"/>
</ehcache>
二、 配置Bean

<beans:bean id="resourceCache" class="com.wanmei.system.security.cache.ResourceCache">
<beans:property name="cache">
<beans:bean class="org.springframework.cache.ehcache.EhCacheFactoryBean" autowire="byName">
<beans:property name="cacheManager" ref="cacheManager"/>
<beans:property name="cacheName" value="resourceCache"/>
</beans:bean>
</beans:property>
</beans:bean>
三、 对象
public class ResourceCache {
private Cache cache;
public void setCache(Cache cache) {
this.cache = cache;
}
public Cache getCache() {
return this.cache;
}

public Object getAuthorityFromCache(String resString) {
Element element = null;

try {
element = cache.get(resString);
} catch (CacheException cacheException) {
throw new DataRetrievalFailureException("Cache failure: " + cacheException.getMessage(), cacheException);
}
if (element == null) {
return null;
} else {
return element.getValue();
}
}

public void putAuthorityInCache(Object obj) {
Element element = new Element(key, obj);

if (logger.isDebugEnabled()) {
logger.debug("Cache put: " + element.getKey());
}

this.cache.put(element);
}

public void removeAuthorityFromCache(String resString) {
this.cache.remove(resString);
}

private List<String> getResourcesByType(String type) {
List resources;

List<String> resclist = new ArrayList<String>();

try {
resources = this.cache.getKeys();
} catch (IllegalStateException e) {
throw new IllegalStateException(e.getMessage(), e);
} catch (CacheException e) {
throw new UnsupportedOperationException(e.getMessage(), e);
}

for (Iterator iter = resources.iterator(); iter.hasNext();) {
String resString = (String) iter.next();
ResourceDetails resourceDetails = getAuthorityFromCache(resString);
if (resourceDetails != null && resourceDetails.getResourceType().equals(type)) {
resclist.add(resString);
}
}

return resclist;
}
}