Java实现简单的缓存机制原理

package qinbo hui;

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/*

设计思想来自－回钦波（qq: )

*/

public class CacheConfModel implements java io Serializable{

private long beginTime;

private boolean isForever = false;

private int durableTime;

public long getBeginTime() {

return beginTime;

}

public void setBeginTime(long beginTime) {

this beginTime = beginTime;

}

public boolean isForever() {

return isForever;

}

public void setForever(boolean isForever) {

this isForever = isForever;

}

public int getDurableTime() {

return durableTime;

}

public void setDurableTime(int durableTime) {

this durableTime = durableTime;

}

}

package qinbo hui;

import java util *;

import test CacheConfModel;

/*

设计思想来自－回钦波（qq: )

*/

public class CacheMgr {

private static Map cacheMap = new HashMap();

private static Map cacheConfMap = new HashMap();

private CacheMgr(){

}

private static CacheMgr cm = null;

public static CacheMgr getInstance(){

if(cm==null){

cm = new CacheMgr();

Thread t = new ClearCache();

t start();

}

return cm;

}

/**

* 增加缓存

* @param key

* @param value

* @param ccm 缓存对象

* @return

*/

public  boolean addCache(Object key Object value CacheConfModel ccm){

boolean flag = false;

cacheMap put(key value);

cacheConfMap put(key ccm);

System out println( now addcache== +cacheMap size());

return true;

}

/**

* 删除缓存

* @param key

* @return

*/

public  boolean removeCache(Object key){

cacheMap remove(key);

cacheConfMap remove(key);

System out println( now removeCache== +cacheMap size());

return true;

}

/**

* 清除缓存的类

* @author wanglj

* 继承Thread线程类

*/

private static class ClearCache extends Thread{

public void run(){

while(true){

Set tempSet = new HashSet();

Set set = cacheConfMap keySet();

Iterator it = erator();

while(it hasNext()){

Object key = it next();

CacheConfModel ccm = (CacheConfModel)cacheConfMap get(key);

//比较是否需要清除

if(!ccm isForever()){

if((new Date() getTime() ccm getBeginTime())= ccm getDurableTime()* * ){

//可以清除 先记录下来

tempSet add(key);

}

}

}

//真正清除

Iterator tempIt = erator();

while(tempIt hasNext()){

Object key = tempIt next();

cacheMap remove(key);

cacheConfMap remove(key);

}

System out println( now thread================ +cacheMap size());

//休息

try {

Thread sleep( * L);

} catch (InterruptedException e) {

// TODO Auto generated catch block

e printStackTrace();

}

}

}

}

lishixinzhi/Article/program/Java/hx/201311/25737

java如何将页面每次请求获得的数据缓存起来供使用？

?阏飧龊诵牡牡胤剑?褪莂ction这儿不去查数据库，而拿到缓存的数据再直接返回到前台嘛。核心代码逻辑就是：longobsoleteTime=1天;

List

list=cache.get(abc,

obsoleteTime);if(list==null){

list=manager.search(..);

这样的缓存策略很多的啊。比如oscache就可以达到要求，而且用起来很简单，只要一个jar，自己抽象一个cache的接口，套上去，就能用了。

java怎么将数据放入缓存

java放入session缓存中

方法如下：

session.setAttribute("Name",Value);

Name 随便取，value就是要放的数据

获取的时候session.getAttribute("Name);

就可以了