springboot +redis 实现点赞、浏览、收藏、评论等数量的增减操作

springboot +redis 实现点赞、浏览、收藏、评论等数量的增减操作

前言

第一次写博客，记录一下：

最近做了一个帖子的收藏、点赞数量的功能，其实之前也做过类似的功能，因为之前一直使用的mysql 总是感觉对于这种频繁需要改变的值，不应该给予Mysql过大的压力，本文章采用的是redis 做了持久化。下面贴出关键代码：DataResponse是项目中使用的结果封装实体类；forumDTO是此功能的参数实体，如果有需要请留言。

常量如下：

 private static final String DEFAULT_VALUE = "0:0:0:0:0:0";
  public static final Byte BYTE_ZERO = 0;
  public static final Byte BYTE_ONE = 1;
  public static final Byte BYTE_TWO = 2;
  public static final Byte BYTE_THREE = 3;
  public static final Byte BYTE_FOUR = 4;
  public static final Byte BYTE_FIVE = 5;
  public static final Byte BYTE_SIX = 6;

 @Override
  public DataResponse keepNum(ForumDTO forumDTO) {
    //将帖子id 设置为 key
    String key = forumDTO.getPostId().toString();
    //get 用户id
    String userId = forumDTO.getUserId();
    String count, newCount;
    //绑定数据集key
    BoundHashOperations post = redisTemplate.boundHashOps("post:");
    //获取hKey
    // count: 0论坛-点赞量 1评论量 2收藏量 3浏览 4评论-点赞量
    if (null == post.get(key)) {
      //无则set
      post.put(key, DEFAULT_VALUE);
      //再取出来赋值给 count
      count = post.get(key).toString();
    } else {
      //有直接赋值 count
      count = post.get(key).toString();
    }
    // operationType 1 浏览 2 帖子点赞 3 收藏 4评论-点赞
    String prefix;
    switch (forumDTO.getOperationType()) {
      case 1:
 //记录浏览次数 OPERATIonTYPE 1 : 记录浏览次数
 newCount = resetValue(count, BYTE_THREE, true);
 post.put(key, newCount);
 break;
      case 2:
 //记录帖子-点赞
 prefix = "thumbs:post";
 switch (forumDTO.getClickType()) {
   case 0:
     
     if (redisTemplate.opsForSet().isMember(prefix + ":" + key, prefix + ":" + userId)) {
return DataResponse.fail("不能重复点赞哦");
     } else {
redisTemplate.opsForSet().add(prefix + ":" + key, prefix + ":" + userId);
     }
     newCount = resetValue(count, BYTE_ZERO, true);
     //set to redis
     post.put(key, newCount);
     break;
   case 1:
     //OPERATIonTYPE 2: + CLICKTYPE 1 = 取消帖子点赞
     //1取消帖子点赞
     if (!redisTemplate.opsForSet().isMember(prefix + ":" + key, prefix + ":" + userId)) {
//重复处理
return DataResponse.fail("不能重复取消哦");
     } else {
//删除
redisTemplate.opsForSet().remove(prefix + ":" + key, prefix + ":" + userId);
     }
     newCount = resetValue(count, BYTE_ZERO, false);
     post.put(key, newCount);
     break;
 }
 break;
      case 3:
 prefix = "collection:post";
 List sendList = new linkedList<>();
 MqMessage mqMessage = new MqMessage();
 switch (forumDTO.getClickType()) {
   //OPERATIonTYPE 3 + CLICKTYPE 0 = 记录收藏
   case 0:
     //数量+1
     //根据用户id + 帖子id 查询redis 数据
     if (redisTemplate.opsForSet().isMember(prefix + ":" + key, prefix + ":" + userId)) {
//重复处理
return DataResponse.fail("不能重复收藏哦");
     }
     //add
     redisTemplate.opsForSet().add(prefix + ":" + key, prefix + ":" + userId);
     //set to redis
     newCount = resetValue(count, BYTE_TWO, true);
     post.put(key, newCount);
     mqMessage.setType(new Byte("9"));
     mqMessage.setSenderId(userId);
     mqMessage.setPostId(forumDTO.getPostId());
     sendList.add(mqMessage);
     this.sendMq.send(sendList);
     break;
   //OPERATIonTYPE 3 + CLICKTYPE 1 = 取消收藏
   case 1:
     //取消收藏
     //尝试从redis取出当前用户是否已经收藏
     if (!redisTemplate.opsForSet().isMember(prefix + ":" + key, prefix + ":" + userId)) {
//重复处理
return DataResponse.fail("不能重复取消哦");
     }
     //删除
     redisTemplate.opsForSet().remove(prefix + ":" + key, prefix + ":" + userId);
     newCount = resetValue(count, BYTE_TWO, false);
     post.put(key, newCount);
     mqMessage.setType(new Byte("10"));
     mqMessage.setSenderId(userId);
     mqMessage.setPostId(forumDTO.getPostId());
     sendList.add(mqMessage);
     this.sendMq.send(sendList);
     break;
 }
 break;
      case 4:
 //记录评论-点赞
 // OPERATIonTYPE 4: + CLICKTYPE 0 = 给评论点赞
 if (null == forumDTO.getCommentId()) {
   return DataResponse.fail("评论id不能为空");
 }
 String commentNum, ckey = forumDTO.getCommentId().toString();
 BoundHashOperations comment = redisTemplate.boundHashOps("post:comment");
 if (null == comment.get(ckey)) {
   //无则set
   comment.put(ckey, "0");
   //再取出来赋值给 count
   commentNum = comment.get(ckey).toString();
 } else {
   //有直接赋值 count
   commentNum = comment.get(ckey).toString();
 }
 //赞评论
 prefix = "thumbs:comment";
 switch (forumDTO.getClickType()) {
   case 0:
     
     if (redisTemplate.opsForSet().isMember(prefix + ":" + ckey, prefix + ":" + userId)) {
return DataResponse.fail("不能重复点赞哦");
     } else {
redisTemplate.opsForSet().add(prefix + ":" + ckey, prefix + ":" + userId);
     }
     //set to redis
     comment.put(ckey, cResetValue(commentNum, true));
     break;
   case 1:
     //1取消评论点赞
     if (!redisTemplate.opsForSet().isMember(prefix + ":" + ckey, prefix + ":" + userId)) {
//重复处理
return DataResponse.fail("不能重复取消哦");
     } else {
//删除
redisTemplate.opsForSet().remove(prefix + ":" + ckey, prefix + ":" + userId);
     }
     newCount = cResetValue(commentNum, false);
     comment.put(ckey, newCount);
     break;
 }
 break;
      default:
 DataResponse.fail(ResponseEnum.FAILED);
    }
    return DataResponse.success(ResponseEnum.SUCCESS);
  }

resetValue代码：

 
  private String resetValue(String val, int j, boolean isPlus) {
    String[] value = StringUtils.split(val, ":");
    Long temp = Long.valueOf(value[j]);
    StringBuffer sb = new StringBuffer(16);
    if (isPlus) {
      temp += 1;
    } else {
      temp -= 1;
    }
    value[j] = temp.toString();
    for (int i = 0, len = value.length; i < len; i++) {
      if (i != len - 1) {
 sb.append(value[i]).append(":");
      }else {
 sb.append(value[i]);
      }
    }
    return sb.toString();
  }

总结

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