Google Guava之--cache

<!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>26.0-jre</version>
</dependency>
 
// 初始化:
private static final Cache<String, String> stringCache = CacheBuilder.newBuilder()
                                            .maximumSize(1000)
                                            .expireAfterWrite(10, TimeUnit.MINUTES)
                                            .build();