文章目錄

• 簡單介紹
• 一、打印效果
• 二、數據庫表結構
• 三 實體
• 四、代碼實現
• • 2.1 獲取樹形結構
  • 2.2 添加子節點【回復評論】

簡單介紹

一、打印效果

{"msg": "success","code": 200,"data": [{"createTime": "2021-08-17 08:46:13","updateTime": "2021-08-17 08:46:15","id": 1,"pid": 0,"uid": 1,"aid": 1,"content": "文章非常好，學到了很多，關注你了","support": 0,"isDelete": 0,"child": [{"createTime": "2021-08-19 11:59:08","updateTime": "2021-08-19 11:59:12","id": 3,"pid": 1,"uid": 3,"aid": 1,"content": "我也關注他了，兄弟","support": 0,"isDelete": 0,"child": [{"createTime": "2021-08-19 12:06:24","updateTime": "2021-08-19 12:06:25","id": 4,"pid": 3,"uid": 4,"aid": 1,"content": "你關注他干嘛","support": 0,"isDelete": 0,"child": null}]}]},{"createTime": "2021-08-19 11:58:10","updateTime": "2021-08-19 11:58:11","id": 2,"pid": 0,"uid": 2,"aid": 1,"content": "博主關注一下我，我關注博主了","support": 25,"isDelete": 0,"child": null}] }

二、數據庫表結構

DROP TABLE IF EXISTS `comment`;CREATE TABLE `comment` (`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵',`pid` int(11) NOT NULL DEFAULT '0' COMMENT '父級評論ID',`uid` int(11) NOT NULL COMMENT '評論者ID',`aid` int(20) NOT NULL COMMENT '被評論的文章ID',`content` text NOT NULL COMMENT '評論的內容',`support` int(20) NOT NULL DEFAULT '0' COMMENT '點贊數',`is_delete` int(4) NOT NULL DEFAULT '0' COMMENT '是否刪除：1刪除 0未刪除',`create_time` datetime NOT NULL COMMENT '創建時間',`update_time` datetime NOT NULL COMMENT '更新時間',PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb4;

三 實體

@Data @TableName("comment") public class Comment extends BaseEntity {private static final Long serialVersionUID = 1L;/*** 主鍵*/@TableId(type = IdType.AUTO)private Integer id;/*** 父級評論ID*/private Integer pid;/*** 評論者ID*/private Integer uid;/*** 被評論的文章ID*/private Integer aid;/*** 評論的內容*/private String content;/*** 點贊數*/private Integer support;/*** 是否刪除：1刪除 0未刪除*/private Integer isDelete;/*** 子評論*/@TableField(exist = false)private List<Comment> child; }

四、代碼實現

2.1 獲取樹形結構

/*** 獲取樹形結構* @param list 需要轉換的列表* @return*/private List<Comment> getTree(List<Comment> list) {List<Comment> treeList = new ArrayList<>();for (Comment comment : list) {if (comment.getPid().equals(0)) {treeList.add(getChild(comment, list));}}return treeList;}

2.2 添加子節點【回復評論】

/*** 獲取孩子節點* @param comment 評論當前節點* @param list 列表* @return*/private Comment getChild(Comment comment, List<Comment> list) {for (Comment c : list) {if (comment.getId().equals(c.getPid())) {if (comment.getChild() == null) {comment.setChild(new ArrayList<Comment>());}comment.getChild().add(getChild(c, list));}}return comment;}

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