论坛项目中评论的产生以及@父评论以及树状评论回显

回复： setparentcommment

//回复时 +setparentcomment + 局部刷新 回显 @PostMapping("/comments") public String post(Comment comment, HttpSession session) { Long blogId = comment.getBlog().getId(); comment.setBlog(blogService.getBlog(blogId)); User user = (User) session.getAttribute("user"); if (user != null) { comment.setAvatar(user.getAvatar()); comment.setAdminComment(true); } else { // comment.setAvatar(avatar); } User user1=(User)session.getAttribute("user"); // comment.setUser_id(user.getId()); comment.setUser(user1); comment.setUid(user1.getId()); commentService.saveComment(comment,session); return "redirect:/comments/" + blogId; }

到返回数据的function：

@GetMapping("/comments/{blogId}") public String comments(@PathVariable Long blogId, Model model) { model.addAttribute("comments", commentService.listCommentByBlogId(blogId)); return "blog :: commentList"; }

service层实现类 function：listCommentByBlogId： 分为几个部分 part1: findByBlogIdAndParentCommentNull()

@Override public List<Comment> listCommentByBlogId(Long blogId) { Sort sort = new Sort("createTime"); //获取父节点集合comments List<Comment> comments = commentRepository.findByBlogIdAndParentCommentNull(blogId,sort); return eachComment(comments); }

part2 : eachComment() 简单的复制到commentsView ,也是父节点集合

private List<Comment> eachComment(List<Comment> comments) { List<Comment> commentsView = new ArrayList<>(); for (Comment comment : comments) { Comment c = new Comment(); BeanUtils.copyProperties(comment,c); commentsView.add(c); } //合并评论的各层子代到第一级子代集合中 combineChildren(commentsView); return commentsView; }

part3: combineChildren() set父节点评论的子评论集

private void combineChildren(List<Comment> comments) { for (Comment comment : comments) { List<Comment> replys1 = comment.getReplyComments(); for(Comment reply1 : replys1) { //循环迭代，找出子代，存放在tempReplys中 recursively(reply1); } //修改顶级节点的reply集合为迭代处理后的集合 comment.setReplyComments(tempReplys); //清除临时存放区 tempReplys = new ArrayList<>(); } }

part4: recursively() 通过递归获取当前父节点的子评论集合。

private void recursively(Comment comment) { tempReplys.add(comment);//顶节点添加到临时存放集合 if (comment.getReplyComments().size()>0) { List<Comment> replys = comment.getReplyComments(); for (Comment reply : replys) { tempReplys.add(reply); if (reply.getReplyComments().size()>0) { recursively(reply); } } } }