使用guava实现找回密码的tokenCache以及LRU算法

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

/**
 * Created by hxiuz on 2018/2/10.
 */
public class TokenCache {

    private static Logger logger = LoggerFactory.getLogger(TokenCache.class);

    //超过10000则使用LRU算法[缓存淘汰算法]进行清除缓存
    public static LoadingCache<String,String> localCache = CacheBuilder.newBuilder().initialCapacity(1000).maximumSize(10000).expireAfterAccess(10, TimeUnit.MINUTES)
            .build(new CacheLoader<String, String>() {
                //默认的数据加载实现，当调用get取值时，若key没有对应的值，则调用此方法加载
                @Override
                public String load(String s) throws Exception {
                    return "null";
                }
            });

    public static void setKey(String key,String value){
        localCache.put(key, value);
    }

    public static String getKey(String key){
        String value = null;
        try {
            value = localCache.get(key);
            if("null".equals(value)){
                return null;
            }
            return value;
        }catch (Exception e){
            //打印异常堆栈
            logger.error("localCache get ERROR",e);
        }
        return null;
    }
}