@EnableCaching注解是spring framework中的注解驅(qū)動(dòng)的緩存管理功能。自spring版本3.1起加入了該注解。如果你使用了這個(gè)注解，那么你就不需要在XML文件中配置cache manager了。

當(dāng)你在配置類(@Configuration)上使用@EnableCaching注解時(shí)，會(huì)觸發(fā)一個(gè)post processor，這會(huì)掃描每一個(gè)spring bean，查看是否已經(jīng)存在注解對(duì)應(yīng)的緩存。如果找到了，就會(huì)自動(dòng)創(chuàng)建一個(gè)代理攔截方法調(diào)用，使用緩存的bean執(zhí)行處理。文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-547875.html

@EnableCaching
@Configuration
public class RedisConfig {

    /**
     * @Cacheable注解不支持配置過(guò)期時(shí)間，所有需要通過(guò)配置CacheManneg來(lái)配置默認(rèn)的過(guò)期時(shí)間和針對(duì)每個(gè)類或者是方法進(jìn)行緩存失效時(shí)間配置。
     * @param redisConnectionFactory
     * @return
     */
    @Bean
    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
        return new RedisCacheManager(
                RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory),
                this.getRedisCacheConfigurationWithTtl(600), // 默認(rèn)策略，未配置的 key 會(huì)使用這個(gè)
                this.getRedisCacheConfigurationMap() // 指定 key 策略
        );
    }

    private Map<String, RedisCacheConfiguration> getRedisCacheConfigurationMap() {
        Map<String, RedisCacheConfiguration> redisCacheConfigurationMap = new HashMap<>();
        redisCacheConfigurationMap.put("wxcl", this.getRedisCacheConfigurationWithTtl(60*60*24*7));
        //redisCacheConfigurationMap.put("UserInfoListAnother", this.getRedisCacheConfigurationWithTtl(18000));
        return redisCacheConfigurationMap;
    }

    private RedisCacheConfiguration getRedisCacheConfigurationWithTtl(Integer seconds) {
        StringRedisSerializer keyStringRedisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);

        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
        redisCacheConfiguration = redisCacheConfiguration.serializeValuesWith(
                RedisSerializationContext
                        .SerializationPair
                        .fromSerializer(jackson2JsonRedisSerializer)
        ).entryTtl(Duration.ofSeconds(seconds));
        redisCacheConfiguration.serializeKeysWith(
                RedisSerializationContext
                        .SerializationPair
                        .fromSerializer(keyStringRedisSerializer)
        );

        return redisCacheConfiguration;
    }

}

@Slf4j
@Service("myUserCacheService")
public class MyUserCacheService {

    /**
     * sso登錄用戶獲取當(dāng)前用戶
     * @param token token
     * @param user  獲取默認(rèn)null
     */
    @Cacheable(
            value = "iotgw",
            key = "'user'+#token",
            unless = "#result eq null")
    public Map<String, String> getUserFromRedis(String token, Map<String, String> user) {
        log.info("從緩存中獲取sso登錄人信息失敗 {},準(zhǔn)備寫(xiě)入緩存", user);
        return user;
    }

    /**
     * 獲取企業(yè)信息
     * @param token   存儲(chǔ)關(guān)鍵值
     * @param company 企業(yè)信息
     */
    @Cacheable(
            value = "devicecenter",
            key = "'company'+#token",
            unless = "#result eq null")
    public Map<String, String> getCompanyFromRedis(String token, Map<String, String> company) {
        log.info("從緩存中獲取登錄人信息失敗 {},準(zhǔn)備寫(xiě)入緩存", company);
        return company;
    }

    /**
     * 企業(yè)信息緩存變更
     * @param token   存儲(chǔ)關(guān)鍵值
     * @param company 企業(yè)信息
     */
    @CachePut(
            value = "devicecenter",
            key = "'company'+#token",
            unless = "#result eq null")
    public Map<String, String> setCompanyFromRedis(String token, Map<String, String> company) {
        log.info("從緩存中獲取登錄人信息失敗 {},準(zhǔn)備寫(xiě)入緩存", company);
        return company;
    }

    /**
     * 后臺(tái)登錄用戶獲取當(dāng)前用戶
     */
    @Cacheable(
            value = "iotmgw",
            key = "'user'+#userId",
            unless = "#result eq null")
    public Map<String, String> getManagerUserFromRedis(String userId, Map<String, String> user) {
        log.info("從緩存中獲取后臺(tái)登錄人信息失敗 {},準(zhǔn)備寫(xiě)入緩存", user);
        return user;
    }

}

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