Guava cache简单使用

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使用guava cache用来构建内存级别的缓存，减少对数据库的访问次数

public class Test {    public static void main(String[] args) throws ExecutionException, InterruptedException {        LoadingCache<String, String> cahceBuilder = CacheBuilder                .newBuilder()                .maximumSize(1)  //容量                .expireAfterWrite(1, TimeUnit.SECONDS)  //多久过期                .build(new CacheLoader<String, String>() {                    @Override                    public String load(String key) throws Exception {                        return sssss(key);                    }                });        System.out.println("jerry value:" + cahceBuilder.get("jerry"));        Thread.sleep(1500); //设置1.5s过期，这时候会触发重新取        System.out.println("jerry value:" + cahceBuilder.get("jerry"));    }    private static String sssss(String key) {        System.out.println("load " + key);        String strProValue = "hello " + key + "!";        return strProValue;    }}

打印

load jerryjerry value:hello jerry!load jerryjerry value:hello jerry!

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