评论 |

# 评论列表

VO:

@Data
@NoArgsConstructor
@AllArgsConstructor
public class CommentVo {
    private Long id;
    //文章id
    private Long articleId;
    //根评论id
    private Long rootId;
    //评论内容
    private String content;
    //所回复的目标评论的userid
    private Long toCommentUserId;
    private String toCommentUserName;
    //回复目标评论id
    private Long toCommentId;

    private Long createBy;

    private Date createTime;

    private String username;

    private List<CommentVo> children;
}

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接口：

@GetMapping("/commentList")
@ApiOperation(value = "评论列表")
public ResponseResult commentList(Long articleId, Integer pageNum, Integer pageSize){
    return commentService.commentList(SystemConstants.ARTICLE_COMMENT,articleId,pageNum,pageSize);
}

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@Service("commentService")
public class CommentServiceImpl extends ServiceImpl<CommentMapper, Comment> implements CommentService {

    @Autowired
    private UserService userService;

    @Override
    public ResponseResult commentList(String commentType, Long articleId, Integer pageNum, Integer pageSize) {
        LambdaQueryWrapper<Comment> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SystemConstants.ARTICLE_COMMENT.equals(commentType),Comment::getArticleId,articleId)
                .eq(Comment::getRootId,-1)// 根评论
                .eq(Comment::getType,commentType);
        Page<Comment> page = new Page(pageNum, pageSize);
        page(page,queryWrapper);
        List<Comment> comments = page.getRecords();
        List<CommentVo> commentVoList = toCommentVoList(comments);
        for (CommentVo commentVo : commentVoList) {
            List<CommentVo> children = getChildren(commentVo.getId());
            commentVo.setChildren(children);
        }
        return ResponseResult.okResult(new PageVo(commentVoList,page.getTotal()));
    }

    private List<CommentVo> toCommentVoList(List<Comment> list){
        List<CommentVo> commentVos = BeanCopyUtils.copyBeanList(list, CommentVo.class);
        for (CommentVo commentVo : commentVos) {
            // comment没有userName字段
            String nickName = userService.getById(commentVo.getCreateBy()).getNickName();
            commentVo.setUsername(nickName);
            // comment没有toCommentUserName字段
            if(commentVo.getToCommentUserId()!=-1){
                String toCommentUserName = userService.getById(commentVo.getToCommentUserId()).getNickName();
                commentVo.setToCommentUserName(toCommentUserName);
            }
        }
        return commentVos;
    }

    private List<CommentVo> getChildren(Long id){
        LambdaQueryWrapper<Comment> queryWrapper = new LambdaQueryWrapper<>();
        // 子评论：评论的根评论id 为 id
        queryWrapper.eq(Comment::getRootId, id)
                .orderByAsc(Comment::getCreateTime);
        List<Comment> comments = list(queryWrapper);
        List<CommentVo> commentVos = toCommentVoList(comments);
        return commentVos;
    }
}

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# 发表评论

时间字段填充：

entity中字段上创建和更新分别添加注解：

@TableField(fill = FieldFill.INSERT)
@TableField(fill = FieldFill.INSERT_UPDATE)

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MyMetaObjectHandler：

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        Long userId = null;
        try {
            userId = SecurityUtils.getUserId();
        } catch (Exception e) {
            e.printStackTrace();
            userId = -1L;// 表示是自己创建
        }
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("createBy",userId , metaObject);
        this.setFieldValByName("updateTime", new Date(), metaObject);
        this.setFieldValByName("updateBy", userId, metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", new Date(), metaObject);
        this.setFieldValByName(" ", SecurityUtils.getUserId(), metaObject);
    }
}

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接口：

@PostMapping
@ApiOperation(value = "发表评论")
public ResponseResult addComment(@RequestBody Comment comment){
    return commentService.addComment(comment);
}

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@Override
public ResponseResult addComment(Comment comment) {
    if(!StringUtils.hasText(comment.getContent())){
        throw new SystemException(AppHttpCodeEnum.CONTENT_NOT_NULL);
    }
    save(comment);
    return ResponseResult.okResult();
}

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