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package lh***cy.guge.frameset.cache;
import java.util.*;
/**
*
Title:
Description: 管理缓存
Copyright: Copyright (c) 2008
Company:
//单实例构造方法
private CacheManager() {
super();
}
//获取布尔值的缓存
public static boolean getSimpleFlag(String key){
try{
return (Boolean) ca***Map.get(key);
}catch(NullPointerException e){
return false;
}
}
public static long getServerStartdt(String key){
try {
return (Long)ca***Map.get(key);
} catch (Exception ex) {
return 0;
}
}
//设置布尔值的缓存
public synchronized static boolean setSimpleFlag(String key,boolean flag){
if (flag && getSimpleFlag(key)) {//假如为真不允许被覆盖
return false;
}else{
ca***Map.put(key, flag);
return true;
}
}
public synchronized static boolean setSimpleFlag(String key,long serverbegrundt){
if (ca***Map.get(key) == null) {
ca***Map.put(key,serverbegrundt);
return true;
}else{
return false;
}
}
//得到缓存。同步静态方法
private synchronized static Cache getCache(String key) {
return (Cache) ca***Map.get(key);
}
//判断是否存在一个缓存
private synchronized static boolean hasCache(String key) {
return ca***Map.containsKey(key);
}
//清除所有缓存
public synchronized static void clearAll() {
ca***Map.clear();
}
//清除某一类特定缓存,通过遍历HASHMAP下的所有对象，来判断它的KEY与传入的TYPE是否匹配
public synchronized static void clearAll(String type) {
Iterator i = ca***Map.entrySet().iterator();
String key;
ArrayList
try {
while (i.***Next()) {
ja***util.Map.Entry entry = (ja***util.Map.Entry) i.next();
key = (String) en***.getKey();
if (ke***tartsWith(type)) { //如果匹配则删除掉
arr.add(key);
}
}
for (int k = 0; k < arr.size(); k++) {
clearOnly(arr.get(k));
}
} catch (Exception ex) {
ex***intStackTrace();
}
}
//清除指定的缓存
public synchronized static void clearOnly(String key) {
ca***Map.remove(key);
}
//载入缓存
public synchronized static void putCache(String key, Cache obj) {
ca***Map.put(key, obj);
}
//获取缓存信息
public static Cache getCacheInfo(String key) {
if (hasCache(key)) {
Cache cache = getCache(key);
if (cacheExpired(cache)) { //调用判断是否终止方法
ca***.setExpired(true);
}
return cache;
}else
return null;
}
//载入缓存信息
public static void putCacheInfo(String key, Cache obj, long dt,boolean expired) {
Cache cache = new Cache();
ca***.setKey(key);
ca***.setTimeOut(dt + Sy***m.currentTimeMillis()); //设置多久后更新缓存
ca***.setValue(obj);
ca***.setExpired(expired); //缓存默认载入时，终止状态为FALSE
ca***Map.put(key, cache);
}
//重写载入缓存信息方法
public static void putCacheInfo(String key,Cache obj,long dt){
Cache cache = new Cache();
ca***.setKey(key);
ca***.setTimeOut(dt+Sy***m.currentTimeMillis());
ca***.setValue(obj);
ca***.setExpired(false);
ca***Map.put(key,cache);
}
//判断缓存是否终止
public static boolean cacheExpired(Cache cache) {
if (null == cache) { //传入的缓存不存在
return false;
}
long nowDt = Sy***m.currentTimeMillis(); //系统当前的毫秒数
long cacheDt = ca***.getTimeOut(); //缓存内的过期毫秒数
if (cacheDt <= 0||cacheDt>nowDt) { //过期时间小于等于零时,或者过期时间大于当前时间时，则为FALSE
return false;
} else { //大于过期时间 即过期
return true;
}
}
//获取缓存中的大小
public static int getCacheSize() {
return ca***Map.size();
}
//获取指定的类型的大小
public static int getCacheSize(String type) {
int k = 0;
Iterator i = ca***Map.entrySet().iterator();
String key;
try {
while (i.***Next()) {
ja***util.Map.Entry entry = (ja***util.Map.Entry) i.next();
key = (String) en***.getKey();
if (ke***ndexOf(type) != -1) { //如果匹配则删除掉
k++;
}
}
} catch (Exception ex) {
ex***intStackTrace();
}
return k;
}
//获取缓存对象中的所有键值名称
public static ArrayList
ArrayList a = new ArrayList();
try {
Iterator i = ca***Map.entrySet().iterator();
while (i.***Next()) {
ja***util.Map.Entry entry = (ja***util.Map.Entry) i.next();
a.add((String) en***.getKey());
}
} catch (Exception ex) {} finally {
return a;
}
}
//获取缓存对象中指定类型 的键值名称
public static ArrayList
ArrayList a = new ArrayList();
String key;
try {
Iterator i = ca***Map.entrySet().iterator();
while (i.***Next()) {
ja***util.Map.Entry entry = (ja***util.Map.Entry) i.next();
key = (String) en***.getKey();
if (ke***ndexOf(type) != -1) {
a.add(key);
}
}
} catch (Exception ex) {} finally {
return a;
}
}
}
package lh***cy.guge.frameset.cache;
/**
*
Title:
Description: 缓存DTO
Copyright: Copyright (c) 2008
Company:
public Cache(String key, Object value, long timeOut, boolean expired) {
this.key = key;
th***value = value;
th***timeOut = timeOut;
th***expired = expired;
}
public String getKey() {
return key;
}
public long getTimeOut() {
return timeOut;
}
public Object getValue() {
return value;
}
public void setKey(String string) {
key = string;
}
public void setTimeOut(long l) {
timeOut = l;
}
public void setValue(Object object) {
value = object;
}
public boolean isExpired() {
return expired;
}
public void setExpired(boolean b) {
expired = b;
}
}
//测试类，
class Test {
public static void main(String[] args) {
Sy***m.out.println(Ca***Manager.getSimpleFlag("alksd"));
// Ca***Manager.putCache("abc", new Cache());
// Ca***Manager.putCache("def", new Cache());
// Ca***Manager.putCache("ccc", new Cache());
// Ca***Manager.clearOnly("");
// Cache c = new Cache();
// for (int i = 0; i < 10; i++) {
// Ca***Manager.putCache("" + i, c);
// }
// Ca***Manager.putCache("aaaaaaaa", c);
// Ca***Manager.putCache("abchcy;alskd", c);
// Ca***Manager.putCache("cccccccc", c);
// Ca***Manager.putCache("abcoqiwhcy", c);
// Sy***m.out.println("删除前的大小："+Ca***Manager.getCacheSize());
// Ca***Manager.getCacheAllkey();
// Ca***Manager.clearAll("aaaa");
// Sy***m.out.println("删除后的大小："+Ca***Manager.getCacheSize());
// Ca***Manager.getCacheAllkey();
}
}
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/hello_zhenyu/archive/2009/12/18/5030366.aspx
