<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
            <version>2.5.3</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>2.5.3</version>
        </dependency>

spring:
  redis:
    lettuce:
      pool:
        min-idle=0:
        max-wait=-1ms:
        max-active=3:
        max-idle=3:
    db: ${REDIS_DB:}
    host: ${REDIS_HOST:}
    password: ${REDIS_PASSWORD:}
    port: ${REDIS_PORT:}
# 有了上面的配置后，必須指定下面的配置，否則會(huì)自動(dòng)使用基于 redis 的 cache
spring:
  cache:
    type: simple

@Component
public class CacheTools {
    private static Logger log = LoggerFactory.getLogger(CacheTools.class);
    @Cacheable("mapData")
    public Map<String,String> getCacheData() {
        Map<String,String> cacheMap=new HashMap<>();
        cacheMap.put("k1","v1");
        cacheMap.put("k2","v2");
        cacheMap.put("k3","v3");
        log.info(" init spring boot cache, total count={} ", cacheMap.size());
        return cacheMap;
    }
    @CacheEvict(value = "mapData")
    public void clearCache(){
    }
    @CachePut(cacheNames = "mapData", key = "#key")
    public void updateCache(String key, String value){
    }
}