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Java单表实现评论回复功能(多种实现方式)

作者:毕竟尹稳健

这篇文章主要介绍了Java单表实现评论回复功能,大家都知道评论功能有多种实现方式,本文逐一给大家详细讲解,需要的朋友可以参考下

1.简介

最近在写毕业设计的时候发现需要实现一个评论功能,然后看了一下掘金和csdn的评论区,如何实现评论功能?

评论功能有多种实现方式:

单层型:

在这里插入图片描述

套娃型:

在这里插入图片描述

两层型:

在这里插入图片描述

2.功能实现图

在这里插入图片描述

3.数据库设计

这个地方有个answer_id 很容易让人迷糊:是回复哪个用户的id

CREATE TABLE `tb_blog_comments`  (
  `id` bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '主键',
  `user_id` bigint(20) UNSIGNED NOT NULL COMMENT '用户id',
  `blog_id` bigint(20) UNSIGNED NOT NULL COMMENT '探店id',
  `parent_id` bigint(20) UNSIGNED NOT NULL COMMENT '关联的1级评论id,如果是一级评论,则值为0',
  `answer_id` bigint(20) UNSIGNED NOT NULL COMMENT '回复的评论id',
  `content` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '回复的内容',
  `liked` int(8) UNSIGNED NULL DEFAULT 0 COMMENT '点赞数',
  `status` tinyint(1) UNSIGNED NULL DEFAULT 0 COMMENT '状态,0:正常,1:被举报,2:禁止查看',
  `create_time` timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0) COMMENT '创建时间',
  `update_time` timestamp(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0) ON UPDATE CURRENT_TIMESTAMP(0) COMMENT '更新时间',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = COMPACT;

SET FOREIGN_KEY_CHECKS = 1;

4.实体类

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import java.io.Serializable;
import java.time.LocalDateTime;
import java.util.List;

/**
 * <p>
 * 
 * </p>
 *
 * @author 尹稳健
 * @since 2022-11-09
 */
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("tb_blog_comments")
public class BlogComments implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * 主键
     */
    @TableId(value = "id", type = IdType.AUTO)
    private Long id;

    /**
     * 用户id
     */
    private Long userId;

    /**
     * 探店id
     */
    private Long blogId;

    /**
     * 关联的1级评论id,如果是一级评论,则值为0
     */
    private Long parentId;

    /**
     * 回复的评论id
     */
    private Long answerId;

    /**
     * 回复的内容
     */
    private String content;

    /**
     * 点赞数
     */
    private Integer liked;

    /**
     * 状态,0:正常,1:被举报,2:禁止查看
     */
    private Boolean status;

    /**
     * 创建时间
     */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime createTime;

    /**
     * 更新时间
     */
    private LocalDateTime updateTime;

    /**
     * 是否点赞
     */
    @TableField(exist = false)
    private Boolean isLike;

    /**
     * 子评论
     */
    @TableField(exist = false)
    List<BlogComments> children;

    /**
     * 评论者的昵称
     */
    @TableField(exist = false)
    private String nickName;

    /** 评论者的头像 */
    @TableField(exist = false)
    private String icon;

    /** 评论者的上级昵称 */
    @TableField(exist = false)
    private String pNickName;

    /** 评论者的的上级头像 */
    @TableField(exist = false)
    private String pIcon;
}

5.实现思路

6.功能实现

6.1 Sql入手

首先,我们需要知道自己需要哪些数据,返回给前端

如果你连mybatis都不会,那就看下思路吧
从这里获取到了评论表的所有数据,以及评论的人的信息,比如说昵称、头像、id,可以展示在前端

<?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.sky.mapper.BlogCommentsMapper">
    <select id="findCommentDetail" resultType="com.sky.pojo.BlogComments">
        SELECT
            bl.*,
            u.icon,
            u.nick_name
        FROM `tb_blog_comments` bl
        left join tb_user u
        on u.id = bl.user_id
        where bl.blog_id = #{blogId}
        order by bl.id desc
    </select>
</mapper>

对应的mapper接口

package com.sky.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.sky.pojo.BlogComments;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

/**
 * <p>
 *  Mapper 接口
 * </p>
 *
 * @author 尹稳健
 * @since 2022-11-09
 */
@Mapper
public interface BlogCommentsMapper extends BaseMapper<BlogComments> {

    /**
     * 查询所有的评论信息
     * @param blogId
     * @return
     */
    List<BlogComments> findCommentDetail(Long blogId);
}

6.2 业务实现

@Override
public Result showBlogComments(Long blogId) {
    // 先将数据库中的数据全部查询出来,包括评论作者的信息,昵称和头像
    List<BlogComments> blogComments = blogCommentsMapper.findCommentDetail(blogId);
    // 获取所有的一级评论
    List<BlogComments> rootComments = blogComments.stream().filter(blogComments1 -> blogComments1.getParentId() == 0).collect(Collectors.toList());
    // 从一级评论中获取回复评论
    for (BlogComments rootComment : rootComments) {
        // 回复的评论
        List<BlogComments> comments = blogComments.stream()
                .filter(blogComment -> blogComment.getParentId().equals(rootComment.getId()))
                .collect(Collectors.toList());
        // 回复评论中含有父级评论的信息
        comments.forEach(comment -> {
            // 无法判断pComment是否存在,可以使用Optional
            Optional<BlogComments> pComment
                    = blogComments
                    .stream()
                    // 获取所有的评论的回复id也就是父级id的userid,这样就可以获取到父级评论的信息
                    .filter(blogComment -> comment.getAnswerId().equals(blogComment.getUserId())).findFirst();
            // 这里使用了Optional 只有pcomment!=null 的时候才会执行下面的代码
            pComment.ifPresent(v -> {
                comment.setPNickName(v.getNickName());
                comment.setPIcon(v.getIcon());
            });
            // 判断是否点赞
            isBlogCommentLiked(comment);
        });
        rootComment.setChildren(comments);
        // 判断是否点赞
        isBlogCommentLiked(rootComment);
    }
    return Result.ok(rootComments);
}


7.前端实现

因为前端代码很多,只copy关键代码

<html>
<body>
<div class="comment-list">
          <div class="comment-box" style="display: block" v-for="comment in commnetList" :key="comment.id">
            <div style="display:flex">
              <!-- 评论者头像 -->
              <div class="comment-icon">
                <img :src="comment.icon" alt="">
              </div>
              <!-- 评论div -->
              <div class="comment-info">
                <!-- 评论者昵称 -->
                <div class="comment-user">
                  {{comment.nickName}}
                </div>
                <!-- 评论时间 -->
                <div style="display: flex">
                  {{comment.createTime}}
                  <!-- 评论点赞,回复按钮 -->
                  <div style="margin-left: 42%;display: flex;">
                    <div @click="addCommnetLike(comment)" style="display: flex">
                      <svg t="1646634642977" class="icon" viewBox="0 0 1024 1024" version="1.1"
                        xmlns="http://www.w3.org/2000/svg" p-id="2187" width="14" height="14">
                        <path
                          d="M160 944c0 8.8-7.2 16-16 16h-32c-26.5 0-48-21.5-48-48V528c0-26.5 21.5-48 48-48h32c8.8 0 16 7.2 16 16v448zM96 416c-53 0-96 43-96 96v416c0 53 43 96 96 96h96c17.7 0 32-14.3 32-32V448c0-17.7-14.3-32-32-32H96zM505.6 64c16.2 0 26.4 8.7 31 13.9 4.6 5.2 12.1 16.3 10.3 32.4l-23.5 203.4c-4.9 42.2 8.6 84.6 36.8 116.4 28.3 31.7 68.9 49.9 111.4 49.9h271.2c6.6 0 10.8 3.3 13.2 6.1s5 7.5 4 14l-48 303.4c-6.9 43.6-29.1 83.4-62.7 112C815.8 944.2 773 960 728.9 960h-317c-33.1 0-59.9-26.8-59.9-59.9v-455c0-6.1 1.7-12 5-17.1 69.5-109 106.4-234.2 107-364h41.6z m0-64h-44.9C427.2 0 400 27.2 400 60.7c0 127.1-39.1 251.2-112 355.3v484.1c0 68.4 55.5 123.9 123.9 123.9h317c122.7 0 227.2-89.3 246.3-210.5l47.9-303.4c7.8-49.4-30.4-94.1-80.4-94.1H671.6c-50.9 0-90.5-44.4-84.6-95l23.5-203.4C617.7 55 568.7 0 505.6 0z"
                          p-id="2188" :fill="comment.isLike ? '#ff6633' : '#82848a'"></path>
                      </svg>
                      &nbsp;{{comment.liked}}
                    </div>
                    <!--  评论回复 -->
                    <div style=" display:flex">
                      &nbsp;&nbsp;&nbsp;&nbsp;
                      <el-dropdown trigger="click" size="mini" placement="top" type="mini">
                        <i class="el-icon-more"></i>
                        <el-dropdown-menu>
                          <el-dropdown-item>
                            <div @click="replyCommentForm(comment)">
                              回复
                            </div>
                          </el-dropdown-item>
                          <el-dropdown-item>
                            <div v-if="comment.userId == user.id" @click="deleteComment(comment.id)">
                              删除
                            </div>
                          </el-dropdown-item>
                        </el-dropdown-menu>
                      </el-dropdown>
                      &nbsp;
                    </div>
                  </div>
                </div>
                <!-- 评论主题 : 评论内容,点赞,回复 -->
                <div style="padding: 5px 0; font-size: 14px;display: flex;">
                  <!-- 评论内容 -->
                  <div>
                    {{comment.content}}
                  </div>
                </div>
              </div>
            </div>

            <!-- 回复的内容 -->
            <div v-if="comment.children.length" style="padding-left: 5px;">
              <div v-for="reply in comment.children" :key="reply.id" style="padding: 5px 10px">
                <div style="display: flex">
                  <!-- 评论者头像 -->
                  <div class="comment-icon">
                    <img :src="reply.icon" alt="">
                  </div>
                  <!-- 评论div -->
                  <div class="comment-info">
                    <!-- 评论者昵称 -->
                    <div class="comment-user">
                      {{reply.nickName}} &nbsp;回复: {{reply.pnickName}}
                    </div>
                    <!-- 评论时间 -->
                    <div style="display: flex">
                      {{reply.createTime}}
                      <!-- 评论点赞,回复按钮 -->
                      <div style="margin-left: 40%;display: flex;">
                        <div style="display: flex" @click="addCommnetLike(reply)">
                          <svg t="1646634642977" class="icon" viewBox="0 0 1024 1024" version="1.1"
                            xmlns="http://www.w3.org/2000/svg" p-id="2187" width="14" height="14">
                            <path
                              d="M160 944c0 8.8-7.2 16-16 16h-32c-26.5 0-48-21.5-48-48V528c0-26.5 21.5-48 48-48h32c8.8 0 16 7.2 16 16v448zM96 416c-53 0-96 43-96 96v416c0 53 43 96 96 96h96c17.7 0 32-14.3 32-32V448c0-17.7-14.3-32-32-32H96zM505.6 64c16.2 0 26.4 8.7 31 13.9 4.6 5.2 12.1 16.3 10.3 32.4l-23.5 203.4c-4.9 42.2 8.6 84.6 36.8 116.4 28.3 31.7 68.9 49.9 111.4 49.9h271.2c6.6 0 10.8 3.3 13.2 6.1s5 7.5 4 14l-48 303.4c-6.9 43.6-29.1 83.4-62.7 112C815.8 944.2 773 960 728.9 960h-317c-33.1 0-59.9-26.8-59.9-59.9v-455c0-6.1 1.7-12 5-17.1 69.5-109 106.4-234.2 107-364h41.6z m0-64h-44.9C427.2 0 400 27.2 400 60.7c0 127.1-39.1 251.2-112 355.3v484.1c0 68.4 55.5 123.9 123.9 123.9h317c122.7 0 227.2-89.3 246.3-210.5l47.9-303.4c7.8-49.4-30.4-94.1-80.4-94.1H671.6c-50.9 0-90.5-44.4-84.6-95l23.5-203.4C617.7 55 568.7 0 505.6 0z"
                              p-id="2188" :fill="reply.isLike ? '#ff6633' : '#82848a'"></path>
                          </svg>
                          &nbsp;{{reply.liked}}
                        </div>
                        <div style="display:flex">
                          &nbsp;&nbsp;&nbsp;&nbsp;
                          <el-dropdown trigger="click" size="mini" placement="top" type="mini">
                            <i class="el-icon-more"></i>
                            <el-dropdown-menu>
                              <el-dropdown-item>
                                <div @click="replyCommentForm(reply)">
                                  回复
                                </div>
                              </el-dropdown-item>
                              <el-dropdown-item>
                                <div v-if="reply.userId == user.id" @click="deleteComment(reply.id)">
                                  删除
                                </div>
                              </el-dropdown-item>
                            </el-dropdown-menu>
                          </el-dropdown>
                          &nbsp;
                        </div>
                      </div>
                    </div>
                    <!-- 评论内容 -->
                    <div style="padding: 5px 0; font-size: 14px;display: flex;">
                      <!-- 评论内容 -->
                      <div>
                        {{reply.content}}
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
<script>
    let each = function (ary, callback) {
      for (let i = 0, l = ary.length; i < l; i++) {
        if (callback(ary[i], i) === false) break
      }
    }
    const app = new Vue({
      el: "#app",
      data: {
        util,
        showPopover: false,
        actions: [{ text: '回复', icon: '' }, { text: '删除', icon: '' }],
        commentsTotal: '',  // 评论总数
        checkCommentInputVisible: false,  // 判断是否点击回复
        commnetList: {},  // 评论回复列表
        placeholderText: '发条友善评论吧~~',
        commentForm: {
          content: '',
          userId: '',
          blogId: '',
          parentId: 0,
          answerId: 0,
        },   // 评论表单
        blog: {},
        shop: {},
        likes: [],
        user: {}, // 登录用户
      methods: {

        replyCommentForm(comment) {
          this.placeholderText = "回复 " + comment.nickName
          this.checkCommentInputVisible = true;
          if (comment.parentId == 0) {
            this.commentForm.parentId = comment.id;
          } else {
            this.commentForm.parentId = comment.parentId;
          }
          this.commentForm.answerId = comment.userId;
        },
        submitCommentForm() {
          this.commentForm.userId = this.user.id;
          this.commentForm.blogId = this.blog.id;
          axios.post("/blog-comments/saveBlogComment", this.commentForm)
            .then(res => {
              this.loadComments(this.blog.id);
              this.checkCommentInputVisible = false;
            })
            .catch(err => this.$message.error(err))
        },
        loadComments(id) {
          axios.get("/blog-comments/showBlogComments/" + id)
            .then(res => {
              this.commnetList = res.data
            })
            .catch(err => this.$message.err(error))
        },
        }
  </script>
  </body>

</html>

8.最终成果

在这里插入图片描述

点赞、评论、回复、删除

在这里插入图片描述

到此这篇关于Java单表实现评论回复功能(多种实现方式)的文章就介绍到这了,更多相关Java评论回复内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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