<dependency>
    <groupId>com.github.ben-manes.caffeine</groupId>
    <artifactId>caffeine</artifactId>
    <version>2.8.6</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-cache</artifactId>
</dependency>

spring:
  cache:
    cache-names: USER
    caffeine:
      spec: initialCapacity=50,maximumSize=500,expireAfterWrite=5s
    type: caffeine

@Service
@Slf4j
public class CaffeineService {

    public static Map<String, String> map = new HashMap<>();

    static {
        map.put("1", "zhangsan");
        map.put("2", "lisi");
        map.put("3", "wangwu");
    }

    @Cacheable(value = "USER", key = "#id")
    public String getUser(String id) {
        log.info("getUser() run......");
        return map.get(id);
    }

    @CachePut(value = "USER", key = "#id")
    public String updateUser(String id, String name) {
        log.info("updateUser() run......");
        map.put(id, name);
        return map.toString();
    }

    @CacheEvict(value = "USER", key = "#id")
    public String delUser(String id) {
        log.info("delUser() run......");
        map.remove(id);
        return map.toString();
    }

}

@RestController
@RequestMapping("/cache")
@Slf4j
public class CaffeineController {

    @Autowired
    private CaffeineService caffeineService;

    @GetMapping("/user/{id}")
    public String getUser(@PathVariable String id) {
        long start = System.currentTimeMillis();
        String res = caffeineService.getUser(id);
        long end = System.currentTimeMillis();
        log.info("查詢耗時(shí)：" + (end - start));
        return res;
    }

    @GetMapping("/user/{id}/{name}")
    public String updateUser(@PathVariable String id, @PathVariable String name) {
        return caffeineService.updateUser(id, name);
    }

    @DeleteMapping("/user/{id}")
    public String delUser(@PathVariable String id) {
        return caffeineService.delUser(id);
    }
}

@Configuration
public class CaffeineConfig {

    @Bean
    public CacheManager caffeineCacheManager() {
        SimpleCacheManager simpleCacheManager = new SimpleCacheManager();
        List<CaffeineCache> caffeineCaches = new ArrayList<>();
        for (CacheType cacheType : CacheType.values()) {
            caffeineCaches.add(new CaffeineCache(cacheType.name(),
                    Caffeine.newBuilder()
                            .expireAfterWrite(cacheType.getExpires(), TimeUnit.SECONDS)
                            .build()));
        }
        simpleCacheManager.setCaches(caffeineCaches);
        return simpleCacheManager;
    }
}

public enum CacheType {

    USER(5),
    TENANT(20);

    private int expires;

    CacheType(int expires) {
        this.expires = expires;
    }

    public int getExpires() {
        return expires;
    }

}