哈喽！大家好，今天给大家带来一个使用concurrentHashMap封装的缓存工具类，并提供了常用的方法：存入缓存、查找缓存、删除缓存、获取缓存大小等等；
✨个人博客：https://blog.csdn.net/weixin_43759352✨
✨公众号：【SimpleMemory】✨
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示例代码：
import lombok.extern.slf4j.Slf4j;import java.util.*;import java.util.concurrent.*;@Slf4jpublic class ConcurrentHashMapCache { private final Map CACHE_MAP = new ConcurrentHashMap(); public final long CACHE_HOLD_TIME_12H = 12 * 60 * 60 * 1000L; public final long CACHE_HOLD_TIME_24H = 24 * 60 * 60 * 1000L; public void put(String cacheName, Object obj) { put(cacheName, obj, CACHE_HOLD_TIME_12H); } public void put(String cacheName, Object obj, long holdTime) { CACHE_MAP.put(cacheName, obj); // 设置缓存失效时间 CACHE_MAP.put(cacheName + "_HoldTime", System.currentTimeMillis() + holdTime); log.info("{}：成功存入缓存！ 过期时间：{}", cacheName, holdTime); } public Object get(String cacheName) { if (checkCacheName(cacheName)) { return CACHE_MAP.get(cacheName); } return null; } public void removeAll() { CACHE_MAP.clear(); } public void remove(String cacheName) { CACHE_MAP.remove(cacheName); CACHE_MAP.remove(cacheName + "_HoldTime"); } public boolean checkCacheName(String cacheName) { Long cacheHoldTime = (Long) CACHE_MAP.get(cacheName + "_HoldTime"); if (cacheHoldTime == null || cacheHoldTime == 0L) { return false; } if (cacheHoldTime < System.currentTimeMillis()) { log.info("缓存：{}已失效！", cacheName); remove(cacheName); return false; } return true; } public Integer size() { if (null != CACHE_MAP && CACHE_MAP.size() > 0) { return CACHE_MAP.size(); } return 0; } public boolean isExist(String cacheName) { if (!checkCacheName(cacheName)) { return Boolean.FALSE; } return CACHE_MAP.containsKey(cacheName); }}
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