设计二级评论记录

效果图：

数据库设计

 实体类：

@Data
@EqualsAndHashCode(callSuper = false)
public class Comment implements Serializable {

    private static final long serialVersionUID = 1L;
    private Integer commentId; //评论的ID
    private String content;
    @JsonFormat(pattern = "yyyy-MM-dd  HH:mm:ss")
    private Date createTime;
    private Integer userId;
    private Integer infoId;
    private Integer parentId;
    private String truename;
    private String replyName; //回复目标名字
    private String headImgUrl;
    private Integer replyUserId;
    private List<User> users;
    List<Comment> child; //回复或者子评论


}

服务层：（有参考，由于搜了好多，忘记参考哪位大神的了，抱歉！！！）

public List<Comment> getComments(Integer infoId){
       //找到所有评论
       List<Comment> allcomments=commentMapper.getComments(infoId);
      //为空，new一个
       if(allcomments==null||allcomments.size()==0){
           return  new ArrayList<>();
       }
       List<Comment> comments=new ArrayList<>();
       List<Comment> parents=new ArrayList<>();
       //遍历评论
       for(Comment comment : allcomments){
           //是否为父评论
           if(comment.getParentId()==null){
               comments.add(comment);
               parents.add(comment);
           }else {
               boolean foundParent=false;
               //找出replyuserid对应的用户信息
               User user=userMapper.getUserById(comment.getReplyUserId());
               //把名字赋予
               comment.setReplyName(user.getTruename());

               for(Comment parent : parents){
                   if (comment.getParentId()==parent.getCommentId()){
                       if (parent.getChild()==null){
                           parent.setChild(new ArrayList<>());

                       }
                       parent.getChild().add(comment);
                       parents.add(comment);
                       foundParent=true;
                       break;
                   }
               }

           }
       }

       return comments;
    }

thymeleaf前端：