【SpringBoot搭建个人博客】- 博客详情页面显示（十一）

博客详情页面包括文章内容和评论部分，本文将从文章内容显示和评论功能来讲述SpringBoot搭建个人博客的详情页面显示，由于博客详情和分类功能都是独立的，这里将评论单独用一个类来编写接口，查询博客详情就直接放在首页的控制器进行处理

分析：

问：博客详情页面是包含文章内容和评论部分，要如何处理

答：在跳转博客详情页面的时候，可以返回连个model，一个是文章详情内容，一个是评论列表

问：文章详情内容如何处理，需要哪些接口？评论如何处理，又需要哪些接口？

答：文章详情内容定义getDetailedBlog博客详情接口，需要定义一个查询实体类来封装一下查询内容，并把分类信息也包含进来；评论功能则需要定义listCommentByBlogId查询评论列表接口、saveComment新增保存接口、deleteComment删除接口

一、文章内容显示

分析：

1. 博客详情实体类

博客详情除了显示博客信息外，还需要显示分类信息，所以还要创建分类名称属性，在queryvo包下创建DetailedBlog博客详情实体类，代码如下（省去get、set、toString方法）：

package com.star.queryvo;

import java.util.Date;

/**
 * @Description: 博客详情实体类
 * @Date: Created in 10:10 2020/6/19
 * @Author: ONESTAR
 * @QQ群: 530311074
 * @URL: https://onestar.newstar.net.cn/
 */
public class DetailedBlog {

    //博客信息
    private Long id;
    private String firstPicture;
    private String flag;
    private String title;
    private String content;
    private Integer views;
    private Integer commentCount;
    private Date updateTime;
    private boolean commentabled;
    private boolean shareStatement;
    private boolean appreciation;
    private String nickname;
    private String avatar;

    //分类名称
    private String typeName;
    
}
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2. Markdown编辑器工具类

• 添加依赖Editor相关依赖

在pom.xml中添加

<dependency>
    <groupId>com.atlassian.commonmark</groupId>
    <artifactId>commonmark</artifactId>
    <version>0.10.0</version>
</dependency>

<dependency>
    <groupId>com.atlassian.commonmark</groupId>
    <artifactId>commonmark-ext-heading-anchor</artifactId>
    <version>0.10.0</version>
</dependency>

<dependency>
    <groupId>com.atlassian.commonmark</groupId>
    <artifactId>commonmark-ext-gfm-tables</artifactId>
    <version>0.10.0</version>
</dependency>
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• 添加MarkdownUtils工具类

在util工具包下添加MarkdownUtils工具类：

package com.star.util;

import org.commonmark.Extension;
import org.commonmark.ext.gfm.tables.TableBlock;
import org.commonmark.ext.gfm.tables.TablesExtension;
import org.commonmark.ext.heading.anchor.HeadingAnchorExtension;
import org.commonmark.node.Link;
import org.commonmark.node.Node;
import org.commonmark.parser.Parser;
import org.commonmark.renderer.html.AttributeProvider;
import org.commonmark.renderer.html.AttributeProviderContext;
import org.commonmark.renderer.html.AttributeProviderFactory;
import org.commonmark.renderer.html.HtmlRenderer;

import java.util.*;

/**
 * @Description: Markdown编辑器
 * @Author: ONESTAR
 * @Date: Created in 13:24 2020/4/5
 * @QQ群: 530311074
 * @URL: https://onestar.newstar.net.cn/
 */
public class MarkdownUtils {

    /**
     * markdown格式转换成HTML格式
     * @param markdown
     * @return
     */
    public static String markdownToHtml(String markdown) {
        Parser parser = Parser.builder().build();
        Node document = parser.parse(markdown);
        HtmlRenderer renderer = HtmlRenderer.builder().build();
        return renderer.render(document);
    }

    /**
     * 增加扩展[标题锚点，表格生成]
     * Markdown转换成HTML
     * @param markdown
     * @return
     */
    public static String markdownToHtmlExtensions(String markdown) {
        //h标题生成id
        Set<Extension> headingAnchorExtensions = Collections.singleton(HeadingAnchorExtension.create());
        //转换table的HTML
        List<Extension> tableExtension = Arrays.asList(TablesExtension.create());
        Parser parser = Parser.builder()
                .extensions(tableExtension)
                .build();
        Node document = parser.parse(markdown);
        HtmlRenderer renderer = HtmlRenderer.builder()
                .extensions(headingAnchorExtensions)
                .extensions(tableExtension)
                .attributeProviderFactory(new AttributeProviderFactory() {
                    public AttributeProvider create(AttributeProviderContext context) {
                        return new CustomAttributeProvider();
                    }
                })
                .build();
        return renderer.render(document);
    }

    /**
     * 处理标签的属性
     */
    static class CustomAttributeProvider implements AttributeProvider {
        @Override
        public void setAttributes(Node node, String tagName, Map<String, String> attributes) {
            //改变a标签的target属性为_blank
            if (node instanceof Link) {
                attributes.put("target", "_blank");
            }
            if (node instanceof TableBlock) {
                attributes.put("class", "ui celled table");
            }
        }
    }

    public static void main(String[] args) {
        String table = "| hello | hi   | 哈哈哈   |/n" +
                "| ----- | ---- | ----- |/n" +
                "| 斯维尔多  | 士大夫  | f啊    |/n" +
                "| 阿什顿发  | 非固定杆 | 撒阿什顿发 |/n" +
                "/n";
        String a = "[ONESTAR](https://onestar.newstar.net.cn/)";
        System.out.println(markdownToHtmlExtensions(a));
    }

}
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3. 持久层接口

文章内容显示是从首页点击文章标题或图片，然后跳转到博客详情页面的，所以这里就将代码放在博客业务这一块

在BlogDao接口中添加查询博客详情、文章访问更新、查询评论数量接口

//查询博客详情
DetailedBlog getDetailedBlog(Long id);

//文章访问更新
int updateViews(Long id);

//根据博客id查询出评论数量
int getCommentCountById(Long id);
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4. mapper

根据持久层接口，编写如下SQL：查询博客详情、文章访问更新、查询评论数量，这里需要对博客详情进行封装

<resultMap id="detailedBlog" type="com.star.queryvo.DetailedBlog">
    <id property="id" column="bid"/>
    <result property="firstPicture" column="first_picture"/>
    <result property="flag" column="flag"/>
    <result property="title" column="title"/>
    <result property="content" column="content"/>
    <result property="typeName" column="name"/>
    <result property="views" column="views"/>
    <result property="commentCount" column="comment_count"/>
    <result property="updateTime" column="update_time"/>
    <result property="commentabled" column="commentabled"/>
    <result property="shareStatement" column="share_statement"/>
    <result property="appreciation" column="appreciation"/>
    <result property="nickname" column="nickname"/>
    <result property="avatar" column="avatar"/>
</resultMap>

<!--博客详情查询-->
<select id="getDetailedBlog" resultMap="detailedBlog">
    select b.id bid,b.first_picture,b.flag,b.title,b.content,b.views,b.comment_count,b.update_time,b.commentabled,b.share_statement,b.appreciation, u.nickname,u.avatar,t.name
    from myblog.t_blog b,myblog.t_user u, myblog.t_type t
    where b.user_id = u.id and b.type_id = t.id and b.id = #{id}
</select>

<!--文章访问自增-->
<update id="updateViews" parameterType="com.star.entity.Blog">
    update myblog.t_blog b set b.views = b.views+1 where b.id = #{id}
</update>

<!--查询出文章评论数量并更新-->
<update id="getCommentCountById" parameterType="com.star.entity.Blog">
    update myblog.t_blog b set b.comment_count = (
    select count(*) from myblog.t_comment c where c.blog_id = #{id} and b.id = #{id}
    ) WHERE b.id = #{id}
</update>
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5. 持久层

• 持久层接口

在BlogService接口中添加查询博客详情方法：

//查询博客详情
DetailedBlog getDetailedBlog(Long id);
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• 接口实现

次接口实现主要是设置文章显示格式，文章访问自增和文章评论的统计，在BlogServiceImpl类中添加实现方法，如下：

@Override
public DetailedBlog getDetailedBlog(Long id) {
    DetailedBlog detailedBlog = blogDao.getDetailedBlog(id);
    if (detailedBlog == null) {
        throw new NotFoundException("该博客不存在");
    }
    String content = detailedBlog.getContent();
    detailedBlog.setContent(MarkdownUtils.markdownToHtmlExtensions(content));
    //文章访问数量自增
    blogDao.updateViews(id);
    //文章评论数量更新
    blogDao.getCommentCountById(id);
    return detailedBlog;
}
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6. 控制器

在IndexController类中添加方法，调用业务层接口：

//跳转博客详情页面
@GetMapping("/blog/{id}")
public String blog(@PathVariable Long id, Model model) {
    DetailedBlog detailedBlog = blogService.getDetailedBlog(id);
    model.addAttribute("blog", detailedBlog);
    
    
    return "blog";
}
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二、评论功能

由于评论稍微复杂些，这里将评论单独放一个业务层

分析：

1. 持久层接口

在dao包下创建CommentDao接口，添加如下接口：

package com.star.dao;

import com.star.entity.Comment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @Description: 评论持久层接口
 * @Date: Created in 9:21 2020/6/23
 * @Author: ONESTAR
 * @QQ群: 530311074
 * @URL: https://onestar.newstar.net.cn/
 */
@Mapper
@Repository
public interface CommentDao {

    //查询父级评论
    List<Comment> findByBlogIdParentIdNull(@Param("blogId") Long blogId, @Param("blogParentId") Long blogParentId);

    //查询一级回复
    List<Comment> findByBlogIdParentIdNotNull(@Param("blogId") Long blogId, @Param("id") Long id);

    //查询二级回复
    List<Comment> findByBlogIdAndReplayId(@Param("blogId") Long blogId,@Param("childId") Long childId);

    //添加一个评论
    int saveComment(Comment comment);

    //删除评论
    void deleteComment(Long id);

}
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2.mapper

在mapper目录下创建CommentDao.xml文件，添加如下：

<?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.star.dao.CommentDao">

    <!--添加评论-->
    <insert id="saveComment" parameterType="com.star.entity.Comment">
        insert into myblog.t_comment (nickname,email,content,avatar,create_time,blog_id,parent_comment_id,admin_comment)
        values (#{nickname},#{email},#{content},#{avatar},#{createTime},#{blogId},#{parentCommentId},#{adminComment});
    </insert>

    <!--查询父级评论-->
    <select id="findByBlogIdParentIdNull" resultType="com.star.entity.Comment">
        select *
        from myblog.t_comment c
        where c.blog_id = #{blogId} and c.parent_comment_id = #{blogParentId}
        order by c.create_time desc
    </select>

    <!--查询一级子评论-->
    <select id="findByBlogIdParentIdNotNull" resultType="com.star.entity.Comment">
        select *
        from myblog.t_comment c
        where c.blog_id = #{blogId} and c.parent_comment_id = #{id}
        order by c.create_time desc
    </select>

    <!--查询二级子评论-->
    <select id="findByBlogIdAndReplayId" resultType="com.star.entity.Comment">
        select *
        from myblog.t_comment c
        where c.blog_id = #{blogId} and c.parent_comment_id = #{childId}
        order by c.create_time desc
    </select>

    <!--删除评论-->
    <delete id="deleteComment" >
        delete from myblog.t_comment where id = #{id}
    </delete>

</mapper>
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讲解：

3. 业务层

• 业务层接口：

在service包下创建CommentService接口，如下：

package com.star.service;

import com.star.entity.Comment;

import java.util.List;

/**
 * @Description: 评论业务层接口
 * @Date: Created in 10:22 2020/6/23
 * @Author: ONESTAR
 * @QQ群: 530311074
 * @URL: https://onestar.newstar.net.cn/
 */
public interface CommentService {

    //根据博客id查询评论信息
    List<Comment> listCommentByBlogId(Long blogId);

    //添加保存评论
    int saveComment(Comment comment);

    //删除评论
    void deleteComment(Comment comment,Long id);

}
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• 接口实现：

在Impl包下创建接口实现类：CommentServiceImpl，功能都在这个接口中实现

package com.star.service.Impl;

import com.star.dao.BlogDao;
import com.star.dao.CommentDao;
import com.star.entity.Comment;
import com.star.service.CommentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * @Description: 博客评论业务层接口实现类
 * @Date: Created in 10:23 2020/6/23
 * @Author: ONESTAR
 * @QQ群: 530311074
 * @URL: https://onestar.newstar.net.cn/
 */
@Service
public class CommentServiceImpl implements CommentService {

    @Autowired
    private CommentDao commentDao;

    @Autowired
    private BlogDao blogDao;

    //存放迭代找出的所有子代的集合
    private List<Comment> tempReplys = new ArrayList<>();

    /**
     * @Description: 查询评论
     * @Auther: ONESTAR
     * @Date: 10:42 2020/6/23
     * @Param: blogId：博客id
     * @Return: 评论消息
     */
    @Override
    public List<Comment> listCommentByBlogId(Long blogId) {
        //查询出父节点
        List<Comment> comments = commentDao.findByBlogIdParentIdNull(blogId, Long.parseLong("-1"));
        for(Comment comment : comments){
            Long id = comment.getId();
            String parentNickname1 = comment.getNickname();
            List<Comment> childComments = commentDao.findByBlogIdParentIdNotNull(blogId,id);
            //查询出子评论
            combineChildren(blogId, childComments, parentNickname1);
            comment.setReplyComments(tempReplys);
            tempReplys = new ArrayList<>();
        }
        return comments;
    }

    /**
     * @Description: 查询出子评论
     * @Auther: ONESTAR
     * @Date: 10:43 2020/6/23
     * @Param: childComments：所有子评论
     * @Param: parentNickname1：父评论姓名
     * @Return:
     */
    private void combineChildren(Long blogId, List<Comment> childComments, String parentNickname1) {
        //判断是否有一级子评论
        if(childComments.size() > 0){
            //循环找出子评论的id
            for(Comment childComment : childComments){
                String parentNickname = childComment.getNickname();
                childComment.setParentNickname(parentNickname1);
                tempReplys.add(childComment);
                Long childId = childComment.getId();
                //查询出子二级评论
                recursively(blogId, childId, parentNickname);
            }
        }
    }

    /**
     * @Description: 循环迭代找出子集回复
     * @Auther: ONESTAR
     * @Date: 10:44 2020/6/23
     * @Param: chileId:子评论id
     * @Param: parentNickname1:子评论姓名
     * @Return:
     */
    private void recursively(Long blogId, Long childId, String parentNickname1) {
        //根据子一级评论的id找到子二级评论
        List<Comment> replayComments = commentDao.findByBlogIdAndReplayId(blogId,childId);

        if(replayComments.size() > 0){
            for(Comment replayComment : replayComments){
                String parentNickname = replayComment.getNickname();
                replayComment.setParentNickname(parentNickname1);
                Long replayId = replayComment.getId();
                tempReplys.add(replayComment);
                recursively(blogId,replayId,parentNickname);
            }
        }
    }

    //新增评论
    @Override
    public int saveComment(Comment comment) {
        comment.setCreateTime(new Date());
        int comments = commentDao.saveComment(comment);
        //文章评论计数
        blogDao.getCommentCountById(comment.getBlogId());
        return comments;
    }

    //删除评论
    @Override
    public void deleteComment(Comment comment,Long id) {
        commentDao.deleteComment(id);
        blogDao.getCommentCountById(comment.getBlogId());
    }
}
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4. 控制器

• 添加图片配置 在评论中，需要显示头像，这里直接在配置文件里面进行配置，在application.yml中添加如下配置(这里直接把后面留言的显示图片也一起添加了)：

comment.avatar: /images/avatar.png
message.avatar: /images/avatar.png
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在controller包下创建CommentController类，如下：

package com.star.controller;

import com.star.entity.Comment;
import com.star.entity.User;
import com.star.queryvo.DetailedBlog;
import com.star.service.BlogService;
import com.star.service.CommentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import java.util.List;

/**
 * @Description: 评论控制器
 * @Date: Created in 10:25 2020/6/23
 * @Author: ONESTAR
 * @QQ群: 530311074
 * @URL: https://onestar.newstar.net.cn/
 */
@Controller
public class CommentController {

    @Autowired
    private CommentService commentService;

    @Autowired
    private BlogService blogService;

    @Value("${comment.avatar}")
    private String avatar;

    //查询评论列表
    @GetMapping("/comments/{blogId}")
    public String comments(@PathVariable Long blogId, Model model) {
        List<Comment> comments = commentService.listCommentByBlogId(blogId);
        model.addAttribute("comments", comments);
        return "blog :: commentList";
    }

    //新增评论
    @PostMapping("/comments")
    public String post(Comment comment, HttpSession session, Model model) {
        Long blogId = comment.getBlogId();
        User user = (User) session.getAttribute("user");
        if (user != null) {
            comment.setAvatar(user.getAvatar());
            comment.setAdminComment(true);
        } else {
            //设置头像
            comment.setAvatar(avatar);
        }

        if (comment.getParentComment().getId() != null) {
            comment.setParentCommentId(comment.getParentComment().getId());
        }
        commentService.saveComment(comment);
        List<Comment> comments = commentService.listCommentByBlogId(blogId);
        model.addAttribute("comments", comments);
        return "blog :: commentList";
    }

    //删除评论
    @GetMapping("/comment/{blogId}/{id}/delete")
    public String delete(@PathVariable Long blogId, @PathVariable Long id, Comment comment, RedirectAttributes attributes, Model model){
        commentService.deleteComment(comment,id);
        DetailedBlog detailedBlog = blogService.getDetailedBlog(blogId);
        List<Comment> comments = commentService.listCommentByBlogId(blogId);
        model.addAttribute("blog", detailedBlog);
        model.addAttribute("comments", comments);
        return "blog";
    }

}
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讲解：

查询评论列表：调用接口查询评论信息列表，局部刷新评论信息

新增评论：对评论进行判断，区分游客和管理员

删除评论：将博客id和评论id参数传入，判断删除的是哪一条评论，这里没有做迭代删除子评论，若删除了含有回复的评论，根据之前的查询来看，在前端回复也不会查询出来，但回复并没有删除，依然在数据库里面，删除的只是父评论

5. 前后端交互

给出部分前端代码，仅供参考，了解更多可以查看整个项目源码： github.com/oneStarLR/m…

提交评论

• HTML

<input type="hidden" name="blogId" th:value="${blog.id}">
<input type="hidden" name="parentComment.id" value="-1">
<div class="field">
<textarea name="content" placeholder="请输入评论信息..."></textarea>
</div>
<div class="fields">
<div class="field m-mobile-wide m-margin-bottom-small">
  <div class="ui left icon input">
    <i class="user icon"></i>
    <input type="text" name="nickname" placeholder="姓名" th:value="${session.user}!=null ? ${session.user.nickname}">
  </div>
</div>
<div class="field m-mobile-wide m-margin-bottom-small">
  <div class="ui left icon input">
    <i class="mail icon"></i>
    <input type="text" name="email" placeholder="邮箱" th:value="${session.user}!=null ? ${session.user.email}">
  </div>
</div>
<div class="field  m-margin-bottom-small m-mobile-wide">
  <button id="commentpost-btn" type="button" class="ui teal button m-mobile-wide"><i class="edit icon"></i>发布</button>
</div>
</div>
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• JS

$('#commentpost-btn').click(function () {
    var boo = $('.ui.form').form('validate form');
    if (boo) {
        console.log('校验成功');
        postData();
    } else {
        console.log('校验失败');
    }
});

function postData() {
    $("#comment-container").load(/*[[@{/comments}]]*/"",{
        "parentComment.id" : $("[name='parentComment.id']").val(),
        "blogId" : $("[name='blogId']").val(),
        "nickname": $("[name='nickname']").val(),
        "email"   : $("[name='email']").val(),
        "content" : $("[name='content']").val()
    },function (responseTxt, statusTxt, xhr) {
        $(window).scrollTo($('#goto'),500);
        clearContent();
    });
}
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评论列表

<div id="comment-container"  class="ui teal segment">
  <div th:fragment="commentList">
    <div class="ui threaded comments" style="max-width: 100%;">
      <h3 class="ui dividing header">评论</h3>
      <div class="comment" th:each="comment : ${comments}">
        <a class="avatar">
          <img src="https://unsplash.it/100/100?image=1005" th:src="@{${comment.avatar}}">
        </a>
        <div class="content">
          <a class="author" >
            <span th:text="${comment.nickname}">Matt</span>
            <div class="ui mini basic teal left pointing label m-padded-mini" th:if="${comment.adminComment}">栈主</div>
          </a>
          <div class="metadata">
            <span class="date" th:text="${#dates.format(comment.createTime,'yyyy-MM-dd HH:mm')}">Today at 5:42PM</span>
          </div>
          <div class="text" th:text="${comment.content}">
            How artistic!
          </div>
          <div class="actions">
            <a class="reply" data-commentid="1" data-commentnickname="Matt" th:attr="data-commentid=${comment.id},data-commentnickname=${comment.nickname}" onclick="reply(this)">回复</a>
            <a class="delete" href="#" th:href="@{/comment/{param1}/{param2}/delete(param1=${comment.blogId},param2=${comment.id})}" onclick="return confirm('确定要删除该评论吗？三思啊! 删了可就没了！')" th:if="${session.user}">删除</a>
            <!--<a class="delete" href="#" th:href="@{/comment/{id}/delete(id=${comment.id})}" onclick="return confirm('确定要删除该评论吗？三思啊! 删了可就没了！')" th:if="${session.user}">删除</a>-->

          </div>
        </div>
        <!--子集评论-->
        <div class="comments" th:if="${#arrays.length(comment.replyComments)}>0">
          <div class="comment" th:each="reply : ${comment.replyComments}">
            <a class="avatar">
              <img src="https://unsplash.it/100/100?image=1005" th:src="@{${reply.avatar}}">
            </a>
            <div class="content">
              <a class="author" >
                <span th:text="${reply.nickname}">小红</span>
                <div class="ui mini basic teal left pointing label m-padded-mini" th:if="${reply.adminComment}">栈主</div>
                 <span th:text="|@ ${reply.parentNickname}|" class="m-teal">@ 小白</span>
              </a>
              <div class="metadata">
                <span class="date" th:text="${#dates.format(reply.createTime,'yyyy-MM-dd HH:mm')}">Today at 5:42PM</span>
              </div>
              <div class="text" th:text="${reply.content}">
                How artistic!
              </div>
              <div class="actions">
                <a class="reply" data-commentid="1" data-commentnickname="Matt" th:attr="data-commentid=${reply.id},data-commentnickname=${reply.nickname}" onclick="reply(this)">回复</a>
                <a class="delete" href="#" th:href="@{/comment/{param1}/{param2}/delete(param1=${reply.blogId},param2=${reply.id})}" onclick="return confirm('确定要删除该评论吗？三思啊! 删了可就没了！')" th:if="${session.user}">删除</a>
                <!--<a class="delete" href="#" th:href="@{/comment/{id}/delete(id=${reply.id})}" onclick="return confirm('确定要删除该评论吗？三思啊! 删了可就没了！')" th:if="${session.user}">删除</a>-->
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
复制代码

三、运行访问

运行项目，访问 http://localhost:8080/， 点击一片文章，可以查看文章信息，并能进行评论，登录后可以对评论进行删除

至此，Springboot搭建个人博客详情页面显示开发完成，由于留言功能和评论功能基本一样，之前也写过一篇有关评论的博客 （SpringBoot和Mybatis实现评论楼中楼功能（一张表搞定）） ，所以这里就不讲留言功能的开发了，还有不懂的伙伴可以问我，也可以加群讨论，下一篇就直接讲述分类、时间轴、音乐盒、友人帐、照片墙关于我页面的显示，比较简单，直接在一篇文章中讲完

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