显示评论
数据库
entity_type代表评论的目标类型，评论帖子和评论评论
entity_id代表评论的目标id，具体是哪个帖子/评论
targer_id代表评论指向哪个人
entity
public class Comment {
private int id;
private int userId;
private int entityType;
private int entityId;
private int targetId;
private String content;
private int status;
private Date createTime;
}mapper
根据实体查询一页评论数据
根据实体查询评论的数量（为了分页）
@Mapper
public interface CommentMapper {
List<Comment> selectCommentsByEntity(int entityType, int entityId, int offset, int limit);
int selectCountByEntity(int entityType, int entityId);
} <select id="selectCommentsByEntity" resultType="Comment">
select <include refid="selectFields"></include>
from comment
where status = 0
and entity_type = #{entityType}
and entity_id = #{entityId}
order by create_time asc
limit #{offset}, #{limit}
</select>
<select id="selectCountByEntity" resultType="int">
select count(id)
from comment
where status = 0
and entity_type = #{entityType}
and entity_id = #{entityId}
</select>service
处理查询评论的业务
处理查询评论数量的业务
@Service
public class CommentService implements CommunityConstant {
@Autowired
private CommentMapper commentMapper;
public List<Comment> findCommentsByEntity(int entityType, int entityId, int offset, int limit) {
return commentMapper.selectCommentsByEntity(entityType, entityId, offset, limit);
}
public int findCommentCount(int entityType, int entityId) {
return commentMapper.selectCountByEntity(entityType, entityId);
}
}controller
查询回复，查询回复数量是在查看帖子的时候进行的，所以修改discussPostController里面的getDiscussPost函数就可以
显示帖子详细数据时，同时显示该帖子所有的评论数据
@RequestMapping(path = "/detail/{discussPostId}", method = RequestMethod.GET)
public String getDiscussPost(@PathVariable("discussPostId") int discussPostId, Model model, Page page) {
// 帖子
DiscussPost post = discussPostService.findDiscussPostById(discussPostId);
model.addAttribute("post", post);
// 作者
User user = userService.findUserById(post.getUserId());
model.addAttribute("user", user);
// 评论分页信息
page.setLimit(5);
page.setPath("/discuss/detail/" + discussPostId);
// 直接在帖子里面取了
page.setRows(post.getCommentCount());
// 评论: 给帖子的评论
// 回复: 给评论的评论
// 评论列表，得到当前帖子的所有评论
List<Comment> commentList = commentService.findCommentsByEntity(
ENTITY_TYPE_POST, post.getId(), page.getOffset(), page.getLimit());
// 评论VO列表，VO-》view object
List<Map<String, Object>> commentVoList = new ArrayList<>();
if (commentList != null) {
for (Comment comment : commentList) {
// 评论VO
Map<String, Object> commentVo = new HashMap<>();
// 评论
commentVo.put("comment", comment);
// 作者
commentVo.put("user", userService.findUserById(comment.getUserId()));
// 回复列表，不搞分页
List<Comment> replyList = commentService.findCommentsByEntity(
ENTITY_TYPE_COMMENT, comment.getId(), 0, Integer.MAX_VALUE);
// 回复VO列表
List<Map<String, Object>> replyVoList = new ArrayList<>();
if (replyList != null) {
for (Comment reply : replyList) {
Map<String, Object> replyVo = new HashMap<>();
// 回复
replyVo.put("reply", reply);
// 作者
replyVo.put("user", userService.findUserById(reply.getUserId()));
// 回复目标
User target = reply.getTargetId() == 0 ? null : userService.findUserById(reply.getTargetId());
replyVo.put("target", target);
replyVoList.add(replyVo);
}
}
commentVo.put("replys", replyVoList);
// 回复数量
int replyCount = commentService.findCommentCount(ENTITY_TYPE_COMMENT, comment.getId());
commentVo.put("replyCount", replyCount);
commentVoList.add(commentVo);
}
}
model.addAttribute("comments", commentVoList);
return "/site/discuss-detail";
}前端
index
<ul class="d-inline float-right">
<li class="d-inline ml-2">赞 11</li>
<li class="d-inline ml-2">|</li>
<li class="d-inline ml-2">回帖 <span th:text="${map.post.commentCount}">7</span></li>
</ul>discuss-detail
这个改的有点多，但是估计不会问前端的东西
增加评论
mapper
增加评论数据
@Mapper
public interface CommentMapper {
int insertComment(Comment comment);
} <insert id="insertComment" parameterType="Comment">
insert into comment(<include refid="insertFields"></include>)
values(#{userId},#{entityType},#{entityId},#{targetId},#{content},#{status},#{createTime})
</insert>修改帖子的评论数量
@Mapper
public interface DiscussPostMapper {
int updateCommentCount(int id, int commentCount);
} <update id="updateCommentCount">
update discuss_post set comment_count = #{commentCount} where id = #{id}
</update>service
处理添加评论的业务
CommentService
@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
public int addComment(Comment comment) {
if (comment == null) {
throw new IllegalArgumentException("参数不能为空!");
}
// 添加评论
comment.setContent(HtmlUtils.htmlEscape(comment.getContent()));
comment.setContent(sensitiveFilter.filter(comment.getContent()));
int rows = commentMapper.insertComment(comment);
// 更新帖子评论数量
if (comment.getEntityType() == ENTITY_TYPE_POST) {
int count = commentMapper.selectCountByEntity(comment.getEntityType(), comment.getEntityId());
discussPostService.updateCommentCount(comment.getEntityId(), count);
}
return rows;
}先增加评论，再更新帖子的评论数量
DiscussPostService
public int updateCommentCount(int id, int commentCount) {
return discussPostMapper.updateCommentCount(id, commentCount);
}controller
处理添加评论数据的请求
设置添加评论的表单
@Controller
@RequestMapping("/comment")
public class CommentController {
@Autowired
private CommentService commentService;
@Autowired
private HostHolder hostHolder;
@RequestMapping(path = "/add/{discussPostId}", method = RequestMethod.POST)
public String addComment(@PathVariable("discussPostId") int discussPostId, Comment comment) {
comment.setUserId(hostHolder.getUser().getId());
comment.setStatus(0);
comment.setCreateTime(new Date());
commentService.addComment(comment);
return "redirect:/discuss/detail/" + discussPostId;
}
}前端
评论
<!-- 回帖输入 -->
<div class="container mt-3">
<form class="replyform" method="post" th:action="@{|/comment/add/${post.id}|}">
<p class="mt-3">
<a name="replyform"></a>
<textarea placeholder="在这里畅所欲言你的看法吧!" name="content"></textarea>
<input type="hidden" name="entityType" value="1">
<input type="hidden" name="entityId" th:value="${post.id}">
</p>
<p class="text-right">
<button type="submit" class="btn btn-primary btn-sm"> 回 帖 </button>
</p>
</form>
</div>回复
<!-- 回复输入框 -->
<li class="pb-3 pt-3">
<form method="post" th:action="@{|/comment/add/${post.id}|}">
<div>
<input type="text" class="input-size" name="content" placeholder="请输入你的观点"/>
<input type="hidden" name="entityType" value="2">
<input type="hidden" name="entityId" th:value="${cvo.comment.id}">
</div>
<div class="text-right mt-2">
<button type="submit" class="btn btn-primary btn-sm" onclick="#"> 回 复 </button>
</div>
</form>
</li> <div th:id="|huifu-${rvoStat.count}|" class="mt-4 collapse">
<form method="post" th:action="@{|/comment/add/${post.id}|}">
<div>
<input type="text" class="input-size" name="content" th:placeholder="|回复${rvo.user.username}|"/>
<input type="hidden" name="entityType" value="2">
<input type="hidden" name="entityId" th:value="${cvo.comment.id}">
<input type="hidden" name="targetId" th:value="${rvo.user.id}">
</div>
<div class="text-right mt-2">
<button type="submit" class="btn btn-primary btn-sm" onclick="#"> 回 复 </button>
</div>
</form>
</div>
