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本篇內容介紹了“SpringBoot如何實現無限級評論回復功能”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
表結構:
CREATE TABLE `comment` ( `id` bigint(18) NOT NULL AUTO_INCREMENT, `parent_id` bigint(18) NOT NULL DEFAULT '0', `content` text NOT NULL COMMENT '內容', `author` varchar(20) NOT NULL COMMENT '評論人', `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '評論時間', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb4;
數據添加:
INSERT INTO `comment` (`id`, `parent_id`, `content`, `author`, `create_time`) VALUES (1, 0, '這是評論1', '吳名氏', '2023-02-20 17:11:16'); INSERT INTO `comment` (`id`, `parent_id`, `content`, `author`, `create_time`) VALUES (2, 1, '我回復了第一條評論', '吳名氏', '2023-02-20 17:12:00'); INSERT INTO `comment` (`id`, `parent_id`, `content`, `author`, `create_time`) VALUES (3, 2, '我回復了第一條評論的第一條回復', '吳名氏', '2023-02-20 17:12:13'); INSERT INTO `comment` (`id`, `parent_id`, `content`, `author`, `create_time`) VALUES (4, 2, '我回復了第一條評論的第二條回復', '吳名氏', '2023-02-21 09:23:14'); INSERT INTO `comment` (`id`, `parent_id`, `content`, `author`, `create_time`) VALUES (5, 0, '這是評論2', '吳名氏', '2023-02-21 09:41:02'); INSERT INTO `comment` (`id`, `parent_id`, `content`, `author`, `create_time`) VALUES (6, 3, '我回復了第一條評論的第一條回復的第一條回復', '吳名氏', '2023-02-21 09:56:27');
添加后的數據:
方案一先返回評論列表,再根據評論id返回回復列表,以此循環,具體代碼下文進行展示
/**
* 方案一
* @author wuKeFan
* @date 2023-02-20 16:58:08
*/
@Slf4j
@RestController
@RequestMapping("/one/comment")
public class CommentOneController {
@Resource
private CommentService commentService;
@GetMapping("/")
public List<Comment> getList() {
return commentService.getList();
}
@GetMapping("/{id}")
public Comment getCommentById(@PathVariable Long id) {
return commentService.getById(id);
}
@GetMapping("/parent/{parentId}")
public List<Comment> getCommentByParentId(@PathVariable Long parentId) {
return commentService.getCommentByParentId(parentId);
}
@PostMapping("/")
public void addComment(@RequestBody Comment comment) {
commentService.addComment(comment);
}
}/**
* service類
* @author wuKeFan
* @date 2023-02-20 16:55:23
*/
public interface CommentService {
List<Comment> getCommentByParentId(Long parentId);
void addComment(Comment comment);
Comment getById(Long id);
List<Comment> getList();
}/**
* @author wuKeFan
* @date 2023-02-20 16:56:00
*/
@Service
public class CommentServiceImpl implements CommentService{
@Resource
private CommentMapper baseMapper;
@Override
public List<Comment> getCommentByParentId(Long parentId) {
QueryWrapper<Comment> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("parent_id", parentId);
return baseMapper.selectList(queryWrapper);
}
@Override
public void addComment(Comment comment) {
baseMapper.insert(comment);
}
@Override
public Comment getById(Long id) {
return baseMapper.selectById(id);
}
@Override
public List<Comment> getList() {
return baseMapper.selectList(new QueryWrapper<Comment>().lambda().eq(Comment::getParentId, 0));
}
}/**
* mapper類
* @author wuKeFan
* @date 2023-02-20 16:53:59
*/
@Repository
public interface CommentMapper extends BaseMapper<Comment> {
}/**
* 評論表實體類
* @author wuKeFan
* @date 2023-02-20 16:53:24
*/
@Data
@TableName("comment")
public class Comment {
@TableId(type = IdType.AUTO)
private Long id;
private Long parentId;
private String content;
private String author;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
private Date createTime;
}2.6.1 請求評論列表接口(本地的url為:http://localhost:8081/one/comment/ ,GET請求),請求結果如圖
2.6.2 根據評論id(或者回復id)返回回復列表(本地url為:http://localhost:8081/one/comment/parent/1 ,GET請求),請求結果如圖
方案二采用的是將數據裝到一個類似樹的數據結構,然后返回,數據如果多的話,可以根據評論列表進行分頁
/**
* @author wuKeFan
* @date 2023-02-20 17:30:45
*/
@Slf4j
@RestController
@RequestMapping("/two/comment")
public class CommentTwoController {
@Resource
private CommentService commentService;
@GetMapping("/")
public List<CommentDTO> getAllComments() {
return commentService.getAllComments();
}
@PostMapping("/")
public void addComment(@RequestBody Comment comment) {
commentService.addComment(comment);
}
}/**
* service類
* @author wuKeFan
* @date 2023-02-20 16:55:23
*/
public interface CommentService {
void addComment(Comment comment);
void setChildren(CommentDTO commentDTO);
List<CommentDTO> getAllComments();
}/**
* @author wuKeFan
* @date 2023-02-20 16:56:00
*/
@Service
public class CommentServiceImpl implements CommentService{
@Resource
private CommentMapper baseMapper;
@Override
public void addComment(Comment comment) {
baseMapper.insert(comment);
}
@Override
public List<CommentDTO> getAllComments() {
List<CommentDTO> rootComments = baseMapper.findByParentId(0L);
rootComments.forEach(this::setChildren);
return rootComments;
}
/**
* 遞歸獲取
* @param commentDTO 參數
*/
@Override
public void setChildren(CommentDTO commentDTO){
List<CommentDTO> children = baseMapper.findByParentId(commentDTO.getId());
if (!children.isEmpty()) {
commentDTO.setChildren(children);
children.forEach(this::setChildren);
}
}
}/**
* mapper類
* @author wuKeFan
* @date 2023-02-20 16:53:59
*/
@Repository
public interface CommentMapper extends BaseMapper<Comment> {
@Select("SELECT id, parent_id as parentId, content, author, create_time as createTime FROM comment WHERE parent_id = #{parentId}")
List<CommentDTO> findByParentId(Long parentId);
}/**
* 遞歸方式實體類
* @author wuKeFan
* @date 2023-02-20 17:26:48
*/
@Data
public class CommentDTO {
private Long id;
private Long parentId;
private String content;
private String author;
private List<CommentDTO> children;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
private Date createTime;
}3.6.1 通過遞歸的方式以樹的數據結構返回(本地url為:http://localhost:8081/two/comment/ ,GET請求),請求結果如圖
返回的json格式如圖:
[
{
"id": 1,
"parentId": 0,
"content": "這是評論1",
"author": "吳名氏",
"children": [
{
"id": 2,
"parentId": 1,
"content": "我回復了第一條評論",
"author": "吳名氏",
"children": [
{
"id": 3,
"parentId": 2,
"content": "我回復了第一條評論的第一條回復",
"author": "吳名氏",
"children": [
{
"id": 6,
"parentId": 3,
"content": "我回復了第一條評論的第一條回復的第一條回復",
"author": "吳名氏",
"children": null,
"createTime": "2023-02-21 09:56:27"
}
],
"createTime": "2023-02-20 17:12:13"
},
{
"id": 4,
"parentId": 2,
"content": "我回復了第一條評論的第二條回復",
"author": "吳名氏",
"children": null,
"createTime": "2023-02-21 09:23:14"
}
],
"createTime": "2023-02-20 17:12:00"
}
],
"createTime": "2023-02-20 17:11:16"
},
{
"id": 5,
"parentId": 0,
"content": "這是評論2",
"author": "吳名氏",
"children": null,
"createTime": "2023-02-21 09:41:02"
}
]方案三是將所有數據用遞歸的SQL查出來,再把數據解析成樹,返回結果,適合數據較少的情況下,且MySQL版本需要在8.0以上
/**
* @author wuKeFan
* @date 2023-02-20 17:30:45
*/
@Slf4j
@RestController
@RequestMapping("/three/comment")
public class CommentThreeController {
@Resource
private CommentService commentService;
@GetMapping("/")
public List<CommentDTO> getAllCommentsBySql() {
return commentService.getAllCommentsBySql();
}
@PostMapping("/")
public void addComment(@RequestBody Comment comment) {
commentService.addComment(comment);
}
}/**
* service類
* @author wuKeFan
* @date 2023-02-20 16:55:23
*/
public interface CommentService {
List<CommentDTO> getAllCommentsBySql();
}/**
* @author wuKeFan
* @date 2023-02-20 16:56:00
*/
@Service
public class CommentServiceImpl implements CommentService{
@Resource
private CommentMapper baseMapper;
/**
* 遞歸獲取
* @param commentDTO 參數
*/
@Override
public void setChildren(CommentDTO commentDTO){
List<CommentDTO> children = baseMapper.findByParentId(commentDTO.getId());
if (!children.isEmpty()) {
commentDTO.setChildren(children);
children.forEach(this::setChildren);
}
}
}/**
* mapper類
* @author wuKeFan
* @date 2023-02-20 16:53:59
*/
@Repository
public interface CommentMapper extends BaseMapper<Comment> {
@DS("localhost80")
List<CommentDTO> getAllCommentsBySql();
}/**
* 評論表實體類
* @author wuKeFan
* @date 2023-02-20 16:53:24
*/
@Data
@TableName("comment")
public class Comment {
@TableId(type = IdType.AUTO)
private Long id;
private Long parentId;
private String content;
private String author;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
private Date createTime;
private Integer level;
}4.6.1 通過遞歸的方式以樹的數據結構返回(本地url為:http://localhost:8081/three/comment/ ,GET請求),請求結果如圖
返回的json格式如圖:
[
{
"id": 1,
"parentId": 0,
"content": "這是評論1",
"author": "吳名氏",
"children": [
{
"id": 2,
"parentId": 1,
"content": "我回復了第一條評論",
"author": "吳名氏",
"children": [
{
"id": 3,
"parentId": 2,
"content": "我回復了第一條評論的第一條回復",
"author": "吳名氏",
"children": [
{
"id": 6,
"parentId": 3,
"content": "我回復了第一條評論的第一條回復的第一條回復",
"author": "吳名氏",
"children": [],
"createTime": "2023-02-21 09:56:27",
"level": 4
}
],
"createTime": "2023-02-20 17:12:13",
"level": 3
},
{
"id": 4,
"parentId": 2,
"content": "我回復了第一條評論的第二條回復",
"author": "吳名氏",
"children": [],
"createTime": "2023-02-21 09:23:14",
"level": 3
}
],
"createTime": "2023-02-20 17:12:00",
"level": 2
}
],
"createTime": "2023-02-20 17:11:16",
"level": 1
},
{
"id": 5,
"parentId": 0,
"content": "這是評論2",
"author": "吳名氏",
"children": [],
"createTime": "2023-02-21 09:41:02",
"level": 1
}
]“SpringBoot如何實現無限級評論回復功能”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注億速云網站，小編將為大家輸出更多高質量的實用文章！
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