redis demo

方法hset(String key,String field,String value),hmset(String key, Map<String,String> hash),hgetAll()

hash结构(key value)

业务场景:当信物无感时间超过一定时间 就再次出现

实现:

　用redis 存储无感信物去exclude:

//1.批量获取用户的无感信物列表:

(判断无感信物有效期是否超过):

Map<String, String> userGiftList = giftCacheFacade.getUser(userId);

(内置方法:Map<String, String> hash = redisClientTemplate.hgetAll(key))

Map<String, String> newUserGiftList = Maps.newHashMap();
//用户的无感信物id列表
 
List<Integer> excludeGiftIds = Lists.newArrayList();

for (String giftIdStr : userGiftList.keySet()) {
    String giftExpireTime = userGiftList.get(giftIdStr);
    if (System.currentTimeMillis() < Long.valueOf(giftExpireTime)) {
        newUserGiftList.put(giftIdStr, giftExpireTime);
        excludeGiftIds.add(Integer.valueOf(giftIdStr));
    }
}
//2.更新缓存

newUserGiftList.forEach((k, v) -> giftCacheFacade.setUser(userId, Integer.parseInt(k), Long.parseLong(v)));

(内置方法:redisClientTemplate.hset(userId, giftId + "", expireTime + ""))