- 数据层
- 增加评论数据；
- 修改帖子评论数量；
- 业务层
- 处理添加评论的业务；
- 先增加评论、在更新帖子的评论数量；
- 表现层
- 处理添加评论数据的请求；
- 设置添加评论的表单。
一、数据层
1.1 CommentMapper.java
package com.nowcoder.community.dao;
import com.nowcoder.community.entity.Comment;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface CommentMapper {
List<Comment> selectCommentsByEntity(int entityType, int entityId, int offset, int limit);
int selectCountByEntity(int entityType, int entityId);
int insertComment(Comment comment);
}
1.2 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>
<sql id="insertFields">
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>
<insert id="insertComment" parameterType="Comment">
insert into comment (<include refid="insertFields"></include>)
values (#{userId},#{entityType},#{entityId},#{targetId},#{content},#{status},#{createTime})
</insert>
</mapper>
1.3 DiscussPostMapper.java
package com.nowcoder.community.dao;
import com.nowcoder.community.entity.DiscussPost;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import java.util.List;
@Mapper
public interface DiscussPostMapper {
List<DiscussPost> selectDiscussPosts(int userId, int offset, int limit);
// @Param注解用于给参数取别名,
// 如果只有一个参数,并且在<if>里使用,则必须加别名.
int selectDiscussPostRows(@Param("userId") int userId);
// 增加帖子
int insertDiscussPost(DiscussPost discussPost);
DiscussPost selectDiscussPostById(int id);
int updateCommentCount(int id, int commentCount);
}
1.4 DiscussPostMapper.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.DiscussPostMapper">
<sql id="selectFields">
id, user_id, title, content, type, status, create_time, comment_count, score
</sql>
<sql id="insertFields">
user_id, title, content, type, status, create_time, comment_count, score
</sql>
<select id="selectDiscussPosts" resultType="DiscussPost">
select <include refid="selectFields"></include>
from discuss_post
where status != 2
<if test="userId!=0">
and user_id = #{userId}
</if>
order by type desc, create_time desc
limit #{offset}, #{limit}
</select>
<select id="selectDiscussPostRows" resultType="int">
select count(id)
from discuss_post
where status != 2
<if test="userId!=0">
and user_id = #{userId}
</if>
</select>
<insert id="insertDiscussPost" parameterType="DiscussPost">
insert into discuss_post (<include refid="insertFields"></include>)
values (#{userId},#{title},#{content},#{type},#{status},#{createTime},#{commentCount},#{score})
</insert>
<select id="selectDiscussPostById" resultType="DiscussPost">
select <include refid="selectFields"></include>
from discuss_post
where id = #{id}
</select>
<update id="updateCommentCount">
update discuss_post set comment_count = #{commentCount} where id = #{id}
</update>
</mapper>
二、业务层
2.1 Service
package com.nowcoder.community.service;
import com.nowcoder.community.dao.CommentMapper;
import com.nowcoder.community.dao.DiscussPostMapper;
import com.nowcoder.community.entity.Comment;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.SensitiveFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.util.HtmlUtils;
import java.util.List;
@Service
public class CommentService implements CommunityConstant{
@Autowired
private CommentMapper commentMapper;
@Autowired
private SensitiveFilter sensitiveFilter;
@Autowired
private DiscussPostService discussPostService;
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);
}
@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，过滤敏感词和html标签
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){ // 一级评论
int count = commentMapper.selectCountByEntity(comment.getEntityType(), comment.getEntityId());
discussPostService.updateCommentCount(comment.getTargetId(), count);
}
return rows;
}
}
三、表现层
3.1 Controller
package com.nowcoder.community.controller;
import com.nowcoder.community.entity.Comment;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.CommentService;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.util.Date;
@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){
// 获取用户
User user = hostHolder.getUser();
// if(user == null) return 0;
comment.setUserId(user.getId());
comment.setStatus(0);
comment.setCreateTime(new Date());
System.out.println(user.getUsername());
commentService.addComment(comment);
return "redirect:/discuss/detail/" + discussPostId;
}
}
3.2 html
<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="icon" href="https://static.nowcoder.com/images/logo_87_87.png"/>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" crossorigin="anonymous">
<link rel="stylesheet" th:href="@{/css/global.css}" />
<link rel="stylesheet" th:href="@{/css/discuss-detail.css}" />
<title>牛客网-帖子详情</title>
</head>
<body>
<div class="nk-container">
<!-- 头部 -->
<header class="bg-dark sticky-top" th:replace="index::header">
<div class="container">
<!-- 导航 -->
<nav class="navbar navbar-expand-lg navbar-dark">
<!-- logo -->
<a class="navbar-brand" href="#"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<!-- 功能 -->
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link" href="../index.html">首页</a>
</li>
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link position-relative" href="letter.html">消息<span class="badge badge-danger">12</span></a>
</li>
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link" href="register.html">注册</a>
</li>
<li class="nav-item ml-3 btn-group-vertical">
<a class="nav-link" href="login.html">登录</a>
</li>
<li class="nav-item ml-3 btn-group-vertical dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<img src="http://images.nowcoder.com/head/1t.png" class="rounded-circle" style="width:30px;"/>
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item text-center" href="profile.html">个人主页</a>
<a class="dropdown-item text-center" href="setting.html">账号设置</a>
<a class="dropdown-item text-center" href="login.html">退出登录</a>
<div class="dropdown-divider"></div>
<span class="dropdown-item text-center text-secondary">nowcoder</span>
</div>
</li>
</ul>
<!-- 搜索 -->
<form class="form-inline my-2 my-lg-0" action="search.html">
<input class="form-control mr-sm-2" type="search" aria-label="Search" />
<button class="btn btn-outline-light my-2 my-sm-0" type="submit">搜索</button>
</form>
</div>
</nav>
</div>
</header>
<!-- 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:text="${rvo.user.username}">寒江雪</b>:
</span>
<span th:if="${rvo.target!=null}">
<i class="text-info" th:text="${rvo.user.username}">Sissi</i> 回复
<b class="text-info" th:text="${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">
<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>
</div>
</li>
<!-- 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>
</ul>
</div>
</li>
</ul>
<!-- 分页 -->
<nav class="mt-5" th:replace="index::pagination">
<ul class="pagination justify-content-center">
<li class="page-item"><a class="page-link" href="#">首页</a></li>
<li class="page-item disabled"><a class="page-link" href="#">上一页</a></li>
<li class="page-item active"><a class="page-link" href="#">1</a></li>
<li class="page-item"><a class="page-link" href="#">2</a></li>
<li class="page-item"><a class="page-link" href="#">3</a></li>
<li class="page-item"><a class="page-link" href="#">4</a></li>
<li class="page-item"><a class="page-link" href="#">5</a></li>
<li class="page-item"><a class="page-link" href="#">下一页</a></li>
<li class="page-item"><a class="page-link" href="#">末页</a></li>
</ul>
</nav>
</div>
<!-- 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>
</div>
<!-- 尾部 -->
<footer class="bg-dark">
<div class="container">
<div class="row">
<!-- 二维码 -->
<div class="col-4 qrcode">
<img src="https://uploadfiles.nowcoder.com/app/app_download.png" class="img-thumbnail" style="width:136px;" />
</div>
<!-- 公司信息 -->
<div class="col-8 detail-info">
<div class="row">
<div class="col">
<ul class="nav">
<li class="nav-item">
<a class="nav-link text-light" href="#">关于我们</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">加入我们</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">意见反馈</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">企业服务</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">联系我们</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">免责声明</a>
</li>
<li class="nav-item">
<a class="nav-link text-light" href="#">友情链接</a>
</li>
</ul>
</div>
</div>
<div class="row">
<div class="col">
<ul class="nav btn-group-vertical company-info">
<li class="nav-item text-white-50">
公司地址：北京市朝阳区大屯路东金泉时代3-2708北京牛客科技有限公司
</li>
<li class="nav-item text-white-50">
联系方式：010-60728802(电话) admin@nowcoder.com
</li>
<li class="nav-item text-white-50">
牛客科技©2018 All rights reserved
</li>
<li class="nav-item text-white-50">
京ICP备14055008号-4
<img src="http://static.nowcoder.com/company/images/res/ghs.png" style="width:18px;" />
京公网安备 11010502036488号
</li>
</ul>
</div>
</div>
</div>
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</footer>
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<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" crossorigin="anonymous"></script>
<script th:src="@{/js/global.js}"></script>
</body>
</html>
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文章来源：https://www.toymoban.com/news/detail-697208.html
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