使用Redis实现点赞取消点赞的详细代码使用Redis实现点赞取消点赞的详

前言异步实现
代码实现:

/**** @param userId 点赞的人* @param type 点赞与取消点赞的表示* @param textId文章ID* @param entityUserId -- 被点赞的人，文章作者*/private void like(long userId,int type,int textId,long entityUserId){redisTemplate.execute(new SessionCallback() {@Overridepublic Object execute(RedisOperations operations) throws DataAccessException {String entityLikeKey = RedisKeyUtil.getEntityLikeKey(type, textId); String userLikeKey = RedisKeyUtil.getUserLikeKey(entityUserId); boolean isMember = redisTemplate.opsForSet().isMember(entityLikeKey, userId); //多个更新操作，需要事务operations.multi(); if (isMember) {//取消赞redisTemplate.opsForSet().remove(entityLikeKey, userId); redisTemplate.opsForValue().decrement(userLikeKey); } else {//点赞redisTemplate.opsForSet().add(entityLikeKey, userId); redisTemplate.opsForValue().increment(userLikeKey); }return operations.exec(); }}); }/***查询某实体（帖子，评论等）点赞数量* @param type 1点赞，2评论。0表示取消点赞* @param textId* @return*/private long findEntityLikeCount(int type, int textId){String entityLikeKey = RedisKeyUtil.getEntityLikeKey(type, textId); return redisTemplate.opsForSet().size(entityLikeKey); }/*** 查询某人对某文章的点赞状态* @param textId 帖子ID* @param userId* @return*/private int findEntityLikeStatus(int textId,long userId){String entityLikeKey = RedisKeyUtil.getEntityLikeKey(1, textId); //此处返回int，是为了进行扩展。比如扩展踩，为止2.等等情况return redisTemplate.opsForSet().isMember(entityLikeKey,userId)?1:0; }/*** 查询某个用户获得赞，用于在个人主页查看收获了多少赞* @param userId* @return*/private int findUserLikeCount(long userId){String userLikeKey = RedisKeyUtil.getUserLikeKey(userId); Integer count = (Integer) redisTemplate.opsForValue().get(userLikeKey); // count.intValue()数据的整数形式; return count==null?0:count.intValue(); }

【使用Redis实现点赞取消点赞的详细代码】Redis–key设置

public class RedisKeyUtil {private static final String SPLIT = ":"; private static final String PREFIX_ENTITY_LIKE = "like:entity"; private static final String PREFIX_USER_LIKE = "like:user"; private static final String PREFIX_USER_COMMENTS="comments:user"; /***某个实体收到的赞，如帖子，* like:entity:entityType:entityId -> set(userId) 对应set，存入userId* @param entityType* @param entityId* @return*/public static String getEntityLikeKey(int entityType, int entityId) {return PREFIX_ENTITY_LIKE + entityType + SPLIT + entityId; }*某个用户收到的总赞数* like:user:userId ->long* @param userIdpublic static String getUserLikeKey(long userId) {return PREFIX_USER_LIKE + SPLIT + userId; * 汇总某个帖子的评论数量public static String getUserCommentsKey(int articleId) {return PREFIX_USER_COMMENTS + SPLIT + articleId;

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