Google Guava Cache

<!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>30.1.1-jre</version>
    </dependency>

基本工具类

package com.sakura.Utils;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

/**
 * 基于Guava Cache缓存类
 * */
public class TokenCache {
        private static LoadingCache<String,String> localCache= CacheBuilder.newBuilder()
                .initialCapacity(1000)//初始化缓存项为1000
                .maximumSize(10000)//设置缓存项最大值不超过10000
                .expireAfterAccess(365, TimeUnit.DAYS)//定时回收  规定时间没有操作就会被读写就会被回收
                .build(new CacheLoader<String, String>() {
                    //当缓存没有值的时候执行load方法
                    @Override
                    public String load(String s) throws Exception {
                        return "null";
                    }
                });
        public static  void  set(String key,String value){
            localCache.put(key,value);
        }
        public static String get(String key){
            String value=null;
            try {
                value= localCache.get(key);
                if("null".equals(value)){
                    return null;
                }
                return value;
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
            return null;
        }

}