分页查询，redis缓存分页数据，redis双重检测

String pageKey = RedisKeyManagement.getKey(RedisKeyManagement.ACTIVITY_BAISHI_PAGE_CACHE,
        Arrays.asList(activityId.toString(),String.valueOf(current)));
Object pageObj = redisService.get(pageKey);
if(pageObj != null) {
    return ApiResult.success(pageObj);
}
// 字符串对象要.intern（）很重要
synchronized (("lock" + activityId + current).intern()) {
    pageObj = redisService.get(pageKey);
    if(pageObj != null) {
        return ApiResult.success(pageObj);
    }
    ApiResult<PortalPageVO<PlayRecordBaseExtendVO>> apiResult = 读数据库的请求;
    redisService.set(pageKey,apiResult.getData(), Constant.TEN_SECOND);
    return apiResult;
}

参考：

https://blog.csdn.net/A_art_xiang/article/details/126340579