【Java Web】论坛帖子添加评论

Katniss的名字被占用2023-09-06 17:07
  • 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

java 复制代码 
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

java 复制代码 
<?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

java 复制代码 
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

java 复制代码 
<?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

java 复制代码 
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

java 复制代码 
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

java 复制代码 
<!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">
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					<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>
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							<a class="nav-link" href="register.html">注册</a>
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							<a class="nav-link" href="login.html">登录</a>
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							<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>
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								<span class="dropdown-item text-center text-secondary">nowcoder</span>
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						</li>
					</ul>
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					<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="${post.commentCount}">30</i>条回帖</h6>
				</div>
				<div class="col-4 text-right">
					<a href="#replyform" class="btn btn-primary btn-sm">&nbsp;&nbsp;回&nbsp;&nbsp;帖&nbsp;&nbsp;</a>
				</div>
			</div>
			<!-- 回帖列表 -->
			<ul class="list-unstyled mt-4">
				<li class="media pb-3 pt-3 mb-3 border-bottom" th:each="cvo:${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="${rvo.user.username}">寒江雪</b>:&nbsp;&nbsp;
										</span>
									<span th:if="${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>:&nbsp;&nbsp;
										</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="#">&nbsp;&nbsp;回&nbsp;&nbsp;复&nbsp;&nbsp;</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="#">&nbsp;&nbsp;回&nbsp;&nbsp;复&nbsp;&nbsp;</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>
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					<li class="page-item"><a class="page-link" href="#">4</a></li>
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					<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">&nbsp;&nbsp;回&nbsp;&nbsp;帖&nbsp;&nbsp;</button>
				</p>
			</form>
		</div>
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