Java单表实现评论回复功能(多种实现方式)
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
- 套娃型(多层型)
- 两层型
单层型:
套娃型:
两层型:
2.功能实现图
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;
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("tb_blog_comments")
public class BloGComments implements Serializable {
private static final long serialVersionUID = 1L;
@TableId(value = "id", type = IdType.AUTO)
private Long id;
private Long userId;
private Long blogId;
private Long parentId;
private Long answerId;
private String content;
private Integer liked;
private Boolean status;
@jsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private LocalDateTime createTime;
private LocalDateTime updateTime;
@TableField(exist = false)
private Boolean isLike;
@TableField(exist = false)
List<BlogComments> children;
@TableField(exist = false)
private String nickName;
@TableField(exist = false)
private String icon;
@TableField(exist = false)
private String pNickName;
@TableField(exist = false)
private String pIcon;
}
5.实现思路
- 因为有评论区有两层,所以肯定有一个parent_id,这样你才能知道你是哪个评论下面的回复内容,如果继续评论,那么那条评论的parent_id还是之前那条评论的parent_id,而不是那条子评论的id。
- 回复内容也同样是一个评论实体类,只不过是一个集合,所以用List 存储,泛型使用实体类
- 我的功能实现也用到了父评论的用户名和头像,这样可以更好看出这是谁评论的,回复给谁的评论
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;
@Mapper
public interface BlogCommentsMapper extends BaseMapper<BlogComments> {
List<BlogComments> findCommentDetail(Long blogId);
}
6.2 业务实现
- 1.首先我们需要从数据中获取所有的数据
- 2.然后我们需要找到所有的一级评论,一级评论就是最高级,他不在谁的下面,他就是最大的,我这里在添加评论的时候前端做了处理,只要是一级评论,他的paren_id = 0
- 3.然后我们需要从一级评论下面添加他下面所有的子评论
- 最主要的就是如何将父级评论的信息添加到自己的数据中?
- 4.通过子评论中的paren_id 找到父评论,然后通过子评论的answer_id == 父评论的user_id 这样就可以拿到父评论的那一条数据
- 最后通过Optional 添加到子评论的数据中
@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>
{{comment.liked}}
</div>
<!-- 评论回复 -->
<div style=" display:flex">
<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>
</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}} 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>
{{reply.liked}}
</div>
<div style="display:flex">
<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>
</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
点赞、评论、回复、删除
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!
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