本篇文章主要是springboot2 中 redis cache中的一些内容，主要包含2个功能点：

自定义缓存过期时间(全局自定义，每个key不能单独指定)

自定义缓存key前缀

废话不多说，上代码

@Configuration

@EnableCaching

public class CacheConfig extends CachingConfigurerSupport {

private static final String SYSTEMCACHE_REDIS_KEY_PREFIX = "system:cache";

private static final String SYSTEMCACHE_TTL_OFDAY = "system.cache.ttlOfDay";

@Autowired

private RedisConnectionFactory redisConnectionFactory;

@Bean

@Override

public CacheManager cacheManager() {

// 设置系统缓存过期时间为默认30天以及添加自定义前缀

RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()

.entryTtl(

Duration.ofDays(30))

.computePrefixWith(cacheKeyPrefix()); // 设置缓存有效期一小时

return RedisCacheManager.builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))

.cacheDefaults(redisCacheConfiguration).build();

}

@Bean

public CacheKeyPrefix cacheKeyPrefix() {

return new CacheKeyPrefix() {

@Override

public String compute(String cacheName) {

String cid = getCid();//此方法需要自己实现，获取租户编码

StringBuilder sBuilder = new StringBuilder(100);

sBuilder.append(SYSTEMCACHE_REDIS_KEY_PREFIX).append(":");

if (StringUtil.isNotBlank(cid)) {

sBuilder.append(cid).append(":");

}

sBuilder.append(cacheName).append(":");

return sBuilder.toString();

}

};

}

}

用法：

@Cacheable(value = {"MenuTreeByRoles"})

public List> selectMenuTreeByRoles(String roleIds) {...}

则最终以生成system:cache:cid:MenuTreeByRoles为key的缓存；