guava 本地缓存

导入pom文件

<!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>27.0.1-jre</version>
    </dependency>

测试demo

public class Test01 {
    private static Cache<String, String> loadingCache = CacheBuilder.newBuilder()
            /*设置缓存容器的初始容量大小为10*/
            .initialCapacity(10)
            /*设置缓存容器的最大容量大小为100*/
            .maximumSize(100)
            /*设置记录缓存命中率*/
            .recordStats()
            /*设置并发级别为8，智并发基本值可以同事些缓存的线程数*/
            .concurrencyLevel(8)
            /*设置过期时间为2秒*/
            .expireAfterAccess(2, TimeUnit.SECONDS).build();

    public static void setKeyVal(String key, String value){
        loadingCache.put(key, value);
    }

    public static String getValByKey(String key){
        String value = loadingCache.getIfPresent(key);
        return value;
    }
    public static void delKey(String key){
        loadingCache.invalidate(key);
    }

    public static void main(String[] args) throws Exception {
        Test01 test01 = new Test01();
        test01.setKeyVal("hello","world");
        Thread.sleep(3000l);
        String str = test01.getValByKey("hello");
        System.out.println(str);


    }
}