package qinbo hui
/*
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/201311/25737session最好少用，一般系统都用session来存储用户信息，session用多了对系统开销不好，缓存也尽量少用，要用的话都用在基本不会改变的数据上，不然会影响系统，如果经常改变的量，用了缓存，如：一个程序在用缓存中的数据，而另一个程序却在修改缓存的数据，那边程序就会出现不符合的数据了，如果回答对你有帮助，请把分给我吧，谢谢
