今天下午，想了好久，终于决定要用OSCache来缓存我的报表统计了，要不觉得效率很低。呵呵，当然我是选择了opensymphony的OSCache,它可以缓存任何Java对象以及JSP程序，以下是今天下午的成果，写了一个通用类，再在action里面缓存一下。试了一下，效果还算不错。

package com.finegold.digimus.comm;

import com.opensymphony.oscache.base.persistence.CachePersistenceException;

/**

* @author 汪心利 2007-7-5

*@copyRight WWW.FINEGOLD.COM.CN

*

*/

public interface Cache {

/**

* 根据key获取cache里的对象

*

* @param key

* @return

* @throws CachePersistenceException

*/

Object get(Object key) throws CachePersistenceException;

/**

* 根据key以及time获取cache里的对象，对应 inputOSCache(Object key, Object value, int

* i)方法添加进去的对象

*

* @param key

* @param time

* @return

* @throws CachePersistenceException

*/

Object get(Object key, int time) throws CachePersistenceException;

/**

* 将object添加cache

*

* @param key

* @param value

* @throws CachePersistenceException

*/

void inputOSCache(Object key, Object value)

throws CachePersistenceException;

/**

* 将object添加cache

*

* @param key

* @param value

* @param i

* @throws CachePersistenceException

*/

void inputOSCache(Object key, Object value, int i)

throws CachePersistenceException;

/**

* 根据key删除object

*

* @param key

* @throws CachePersistenceException

*/

void remove(Object key) throws CachePersistenceException;

/**

* 清空cache

*

* @throws CachePersistenceException

*/

void clear() throws CachePersistenceException;

/**

* 销毁cache

*

* @throws CachePersistenceException

*/

void destroy() throws CachePersistenceException;

/**

* 根据time 获取key

*

* @param time

* @return

* @throws CachePersistenceException

*/

Object getkey(int time) throws CachePersistenceException;

}

接口的实现类：

package com.finegold.digimus.comm;

/**

* @author BlueSKy_itwangxinli 2007-7-5

*@copyRight WWW.FINEGOLD.COM.CN

*/

import java.util.Properties;

import org.apache.commons.lang.RandomStringUtils;

import com.opensymphony.oscache.base.EntryRefreshPolicy;

import com.opensymphony.oscache.base.NeedsRefreshException;

import com.opensymphony.oscache.base.persistence.CachePersistenceException;

import com.opensymphony.oscache.general.GeneralCacheAdministrator;

import com.opensymphony.oscache.web.filter.ExpiresRefreshPolicy;

/**

* OSCache 缓存共用类

*

* @author 汪心利 2007-7-5

*/

public class OSCache implements Cache {

/**

* 通用缓存管理类 administrator

*/

private GeneralCacheAdministrator cache;

private static OSCache instance;

public OSCache() {

this.cache = new GeneralCacheAdministrator();

}

/**

* 指定加载加载cache.propeties fiel 默认情况下加载classes目录下的OScache.properties

*

* @param prop

*/

public OSCache(Properties prop) {

this.cache = new GeneralCacheAdministrator(prop);

}

/**

* 返回OSCache 的Instance 单态模式

*

* @return

*/

public synchronized static OSCache getInstance() {

if (instance == null) {

instance = new OSCache();

}

return instance;

}

/**

* 设置缓存容量 default value 请查看oscache配置文件，OSCache系统本身默认值unlimited

*

* @param cacheCapacity

*/

public void setCacheCapacity(int cacheCapacity) {

this.cache.setCacheCapacity(cacheCapacity);

}

/**

* 根据Key获取cache里缓存的object

*

* @param key

*            查找关键字

*/

public Object get(Object key) throws CachePersistenceException {

try {

return this.cache.getFromCache(String.valueOf(key));

} catch (NeedsRefreshException e) {

cache.cancelUpdate(String.valueOf(key));

return null;

}

}

/**

* 根据key和time获取缓存的object

*

* @param key

*            查找的key

* @param time

*            (最准确的含义-->)How long the object can stay in cache in seconds

*/

public Object get(Object key, int time) throws CachePersistenceException {

try {

return this.cache.getFromCache(String.valueOf(key), time);

} catch (NeedsRefreshException e) {

cache.cancelUpdate(String.valueOf(key));

return null;

}

}

/**

* 尽量不要使用该方法 根据time 获取key

*

* @param time

*            时间

*/

public Object getkey(int time) throws CachePersistenceException {

String key = RandomStringUtils.randomAlphanumeric(10);

try {

while (this.cache.getFromCache(key) != null) {

key = RandomStringUtils.randomAlphanumeric(10);

}

return key;

} catch (NeedsRefreshException e) {

return key;

}

}

/**

* 缓存对象

*/

public void inputOSCache(Object key, Object value)

throws CachePersistenceException {

this.cache.putInCache(String.valueOf(key), value);

}

/**

* 缓存对象

*

* @param key

*            缓存对象的key

* @param value

*            缓存对象的value

* @param n

*            缓存对象有效时间

*/

public void inputOSCache(Object key, Object value, int n)

throws CachePersistenceException {

EntryRefreshPolicy Policy = new ExpiresRefreshPolicy(n);

this.cache.putInCache(String.valueOf(key), value, Policy);

}

/**

* 根据key从cache里 删除object

*

* @param 要删除缓存对象的key

*/

public void remove(Object key) throws CachePersistenceException {

this.cache.flushEntry(String.valueOf(key));

}

/**

* 清空所有的缓存

*/

public void clear() throws CachePersistenceException {

this.cache.flushAll();

}

/**

* 销毁缓存

*/

public void destroy() throws CachePersistenceException {

this.cache.destroy();

}

}

配置web.xml

CacheFilter

com.opensymphony.oscache.web.filter.CacheFilter

time

600

scope

session