java实现点赞功能，记录点赞数，只点一次

概要

需求：用户点击增加点赞数，再次点击取消点赞，并记录点赞数

1.使用redis记录点赞信息，防止重复点赞或取消点赞
2.使用数据库记录点赞记录、用户表记录点赞数

点赞记录表

/**
 * 点赞记录表
 */
@Data
@Table(name = "body_wear_like_log")
public class BodyWearLikeLog implements Serializable {
    
    
    /**
     * id
     */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY, generator = "SELECT LAST_INSERT_ID()")
    private Integer id;

    /**
     * A点赞B   A
     */
    @Column(name = "source_id")
    private Integer sourceId;

    /**
     * A点赞B  B
     */
    @Column(name = "target_id")
    private Integer targetId;

    /**
     * 点赞时间
     */
    @Column(name = "like_time")
    private Date likeTime;

    /**
     * 更新时间
     */
    @Column(name = "update_time")
    private Date updateTime;

   /**
     * 删除标记
     */
    private Boolean del;

点赞逻辑代码

public AppLikeNumAvatarVo likeAvatar(Integer sourceId, String tlId, Integer likeStatus) {
    
    
        AppLikeNumAvatarVo appLikeNumAvatarVo = new AppLikeNumAvatarVo();
        Integer likeNum = 0;
     
        //查询是否有点赞用户的点赞记录
        Integer targetId = memberAvatar.getId();
        String redisKey = "likeAvatar_" + sourceId + "_" + targetId;
        Integer redisValue = (Integer) redisTemplate.opsForValue().get(redisKey);
        if (Objects.isNull(redisValue) && likeStatus == 1) {
    
    
           BodyWearLikeLog likeLog = bodyWearLikeLogMapper.getByLikeLog(sourceId, targetId);
            if (likeLog == null) {
    
    
                BodyWearLikeLog bodyWearLikeLog = new BodyWearLikeLog();
                bodyWearLikeLog.setSourceId(sourceId);
                bodyWearLikeLog.setTargetId(targetId);
                bodyWearLikeLog.setLikeTime(new Date());
                bodyWearLikeLog.setUpdateTime(new Date());
                bodyWearLikeLog.setDel(false);
                bodyWearLikeLogMapper.insertSelective(bodyWearLikeLog);
                likeNum = memberAvatar.getLikeNum() + 1;
                appLikeNumAvatarVo.setLikeNum(likeNum);
                appLikeNumAvatarVo.setLikeStatus(true);
                redisTemplate.opsForValue().set(redisKey, likeStatus);
                //更新点赞数量
                memberAvatarMapper.updateLikeNum(targetId, likeNum);
            } else {
    
    
                //点赞
                if (likeLog.getDel()) {
    
    
                    bodyWearLikeLogMapper.updateDel(likeLog.getId(), false);
                    likeNum = memberAvatar.getLikeNum() + 1;
                    appLikeNumAvatarVo.setLikeNum(likeNum);
                    appLikeNumAvatarVo.setLikeStatus(true);
                  redisTemplate.opsForValue().set(redisKey, likeStatus);
                //更新点赞数量
                memberAvatarMapper.updateLikeNum(targetId, likeNum);
                }
            }
        }

        if (Objects.nonNull(redisValue) && likeStatus == 0) {
    
    
            BodyWearLikeLog likeLog = bodyWearLikeLogMapper.getByLikeLog(sourceId, targetId);
            if (likeLog != null && !likeLog.getDel()) {
    
    
                //取消点赞 减数量
                bodyWearLikeLogMapper.updateDel(likeLog.getId(), true);
                likeNum = memberAvatar.getLikeNum() - 1;
                appLikeNumAvatarVo.setLikeNum(likeNum);
                appLikeNumAvatarVo.setLikeStatus(false);
                redisTemplate.delete(redisKey);
                //更新点赞数量
                if (likeNum < 0) {
    
    
                    memberAvatarMapper.updateLikeNum(targetId, likeNum);
                }
            }
        }
        return appLikeNumAvatarVo;
    }