仿牛客网社区项目（十五）显示评论
作者：互联网
显示评论
- 数据层
- 根据实体查询一页评论数据。
- 根据实体查询评论的数量。
- 业务层
- 处理查询评论的业务。
- 处理查询评论数量的业务。
- 表现层
- 显示帖子详情数据时，同时显示该帖子所有的评论数据。
1、实体类：
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;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public int getEntityType() {
return entityType;
}
public void setEntityType(int entityType) {
this.entityType = entityType;
}
public int getEntityId() {
return entityId;
}
public void setEntityId(int entityId) {
this.entityId = entityId;
}
public int getTargetId() {
return targetId;
}
public void setTargetId(int targetId) {
this.targetId = targetId;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
@Override
public String toString() {
return "Comment{" +
"id=" + id +
", userId=" + userId +
", entityType=" + entityType +
", entityId=" + entityId +
", targetId=" + targetId +
", content='" + content + '\'' +
", status=" + status +
", createTime=" + createTime +
'}';
}
}
2、数据层
CommentMapper接口
@Mapper
public interface CommentMapper {
List<Comment> selectCommentsByEntity(int entityType, int entityId, int offset, int limit);
int selectCountByEntity(int entityType, int entityId);
}
comment-mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.nowcoder.community.dao.CommentMapper">
<sql id="selectFields">
id, user_id, entity_type, entity_id, target_id, content, status, create_time
</sql>
<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>
</mapper>
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3、业务层
@Service
public class CommentService {
@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);
}
}
4、表现层
DiscussPostController
帖子详情页，有评论，评论中有回复
注入page, post,user,comments
@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);
page.setRows(post.getCommentCount());
// 评论列表
List<Comment> commentList = commentService.findCommentsByEntity(
ENTITY_TYPE_POST, post.getId(), page.getOffset(), page.getLimit());
// 评论显示vo列表
List<Map<String, Object>> commentVoList = new ArrayList<>();
if(commentList != null){
for (Comment comment : commentList) {
Map<String, Object> commentVo = new HashMap<>();
commentVo.put("comment", comment);// 评论
commentVo.put("user", userService.findUserById(comment.getUserId()));// 作者
// 回复列表
List<Comment> replyList = commentService.findCommentsByEntity(
ENTITY_TYPE_COMMENT, comment.getId(), 0, Integer.MAX_VALUE);
// 回复显示vo列表
List<Map<String, Object>> replyVoList = new ArrayList<>();
if (replyList != null) {
for (Comment reply : replyList) {
Map<String, Object> replyVo = new HashMap<>();
replyVo.put("reply", reply);// 回复
replyVo.put("user", userService.findUserById(reply.getUserId()));// 作者
User target = reply.getTargetId() == 0 ? null : userService.findUserById(reply.getTargetId()); // 回复目标
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";
}
discuss-detail.html
- 注入page,post,user,comments
<!-- 内容 -->
<div class="main">
<!-- 帖子详情 -->
<div class="container">
<!-- 标题 -->
<h6 class="mb-4">
<img src="http://static.nowcoder.com/images/img/icons/ico-discuss.png"/>
<span th:utext="${post.title}">备战春招，面试刷题跟他复习，一个月全搞定！</span>
<div class="float-right">
<button type="button" class="btn btn-danger btn-sm">置顶</button>
<button type="button" class="btn btn-danger btn-sm">加精</button>
<button type="button" class="btn btn-danger btn-sm">删除</button>
</div>
</h6>
<!-- 作者 -->
<div class="media pb-3 border-bottom">
<a href="profile.html">
<img th:src="${user.headerUrl}" class="align-self-start mr-4 rounded-circle user-header" alt="用户头像" >
</a>
<div class="media-body">
<div class="mt-0 text-warning" th:utext="${user.username}">寒江雪</div>
<div class="text-muted mt-3">
发布于 <b th:text="${#dates.format(post.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-15 15:32:18</b>
<ul class="d-inline float-right">
<li class="d-inline ml-2"><a href="#" class="text-primary">赞 11</a></li>
<li class="d-inline ml-2">|</li>
<li class="d-inline ml-2"><a href="#replyform" class="text-primary">回帖 <i th:text="${post.commentCount}">7</i></a></li>
</ul>
</div>
</div>
</div>
<!-- 正文 -->
<div class="mt-4 mb-3 content" th:utext="${post.content}">
金三银四的金三已经到了，你还沉浸在过年的喜悦中吗？
如果是，那我要让你清醒一下了：目前大部分公司已经开启了内推，正式网申也将在3月份陆续开始，金三银四，春招的求职黄金时期已经来啦！！！
再不准备，作为19应届生的你可能就找不到工作了。。。作为20届实习生的你可能就找不到实习了。。。
现阶段时间紧，任务重，能做到短时间内快速提升的也就只有算法了，
那么算法要怎么复习？重点在哪里？常见笔试面试算法题型和解题思路以及最优代码是怎样的？
跟左程云老师学算法，不仅能解决以上所有问题，还能在短时间内得到最大程度的提升！！！
</div>
</div>
<!-- 回帖 -->
<div class="container mt-3">
<!-- 回帖数量 -->
<div class="row">
<div class="col-8">
<h6><b class="square"></b> <i th:text="${post.commentCount}">30</i>条回帖</h6>
</div>
<div class="col-4 text-right">
<a href="#replyform" class="btn btn-primary btn-sm"> 回 帖 </a>
</div>
</div>
<!-- 回帖列表 -->
<ul class="list-unstyled mt-4">
<li class="media pb-3 pt-3 mb-3 border-bottom" th:each="cvo:${comments}">
<a href="profile.html">
<img th:src="${cvo.user.headerUrl}" class="align-self-start mr-4 rounded-circle user-header" alt="用户头像" >
</a>
<div class="media-body">
<div class="mt-0">
<span class="font-size-12 text-success" th:utext="cvo.user.username">掉脑袋切切</span>
<span class="badge badge-secondary float-right floor">
<i th:text="${page.offset + cvoStat.count}">1</i>#
</span>
</div>
<div class="mt-2" th:utext="${cvo.comment.content}">
这开课时间是不是有点晚啊。。。
</div>
<div class="mt-4 text-muted font-size-12">
<span>发布于 <b th:text="${#dates.format(cvo.comment.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-15 15:32:18</b></span>
<ul class="d-inline float-right">
<li class="d-inline ml-2"><a href="#" class="text-primary">赞(1)</a></li>
<li class="d-inline ml-2">|</li>
<li class="d-inline ml-2"><a href="#" class="text-primary">回复(<i th:text="${cvo.replyCount}">2</i> )</a></li>
</ul>
</div>
<!-- 回复列表 -->
<ul class="list-unstyled mt-4 bg-gray p-3 font-size-12 text-muted">
<li class="pb-3 pt-3 mb-3 border-bottom" th:each="rvo:${cvo.replys}">
<div>
<span th:if="${rvo.target==null}">
<b class="text-info" th:utext="${rvo.user.username}">寒江雪</b>: </span>
<span th:if="${rvo.target!=null}">
<i class="text-info" th:utext="${rvo.user.username}">Sissi</i> 回复
<b class="text-info" th:utext="${rvo.target.username}">寒江雪</b>: </span>
<span th:utext="${rvo.reply.content}">这个是直播时间哈，觉得晚的话可以直接看之前的完整录播的~</span>
</div>
<div class="mt-3">
<span th:text="${#dates.format(rvo.reply.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-15 15:32:18</span>
<ul class="d-inline float-right">
<li class="d-inline ml-2"><a href="#" class="text-primary">赞(1)</a></li>
<li class="d-inline ml-2">|</li>
<li class="d-inline ml-2"><a th:href="|#huifu-${rvoStat.count}|" data-toggle="collapse" class="text-primary">回复</a></li>
</ul>
<div th:id="|huifu-${rvoStat.count}|" class="mt-4 collapse">
<div>
<input type="text" class="input-size" placeholder="回复寒江雪"/>
</div>
<div class="text-right mt-2">
<button type="button" class="btn btn-primary btn-sm" onclick="#"> 回 复 </button>
</div>
</div>
</div>
</li>
<!-- 回复输入框 -->
<li class="pb-3 pt-3">
<div>
<input type="text" class="input-size" placeholder="请输入你的观点"/>
</div>
<div class="text-right mt-2">
<button type="button" class="btn btn-primary btn-sm" onclick="#"> 回 复 </button>
</div>
</li>
</ul>
</div>
</li>
</ul>
-
src= 网址
-
utext= 会解析html
text= -
each= 遍历
th:each="cvo:${comments}" th:each="rvo:${cvo.replys}" 12 -
if= 条件
th:if="${rvo.target==null}" th:if="${rvo.target!=null}" 12 -
href= 引用
id=th:href="|#huifu-${rvoStat.count}|" th:id="|huifu-${rvoStat.count}|" 12th:utext="${post.title}" th:src="${user.headerUrl}" th:utext="${user.username}" th:text="${#dates.format(post.createTime,'yyyy-MM-dd HH:mm:ss')}" th:text="${post.commentCount}" th:utext="${post.content}" th:each="cvo:${comments}" th:src="${cvo.user.headerUrl}" th:utext="cvo.user.username" th:text="${page.offset + cvoStat.count}" th:utext="${cvo.comment.content}" th:text="${#dates.format(cvo.comment.createTime,'yyyy-MM-dd HH:mm:ss')}" th:text="${cvo.replyCount}" th:each="rvo:${cvo.replys}" th:if="${rvo.target==null}" th:utext="${rvo.user.username}" th:utext="${rvo.target.username}" th:utext="${rvo.reply.content}" th:text="${#dates.format(rvo.reply.createTime,'yyyy-MM-dd HH:mm:ss')}" th:href="|#huifu-${rvoStat.count}|" th:id="|huifu-${rvoStat.count}|"
标签：仿牛,int,entityType,nbsp,id,客网,th,public,十五 来源： https://www.cnblogs.com/nevererror/p/16210929.html