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Springboot+ElementUi实现评论、回复、点赞功能

作者：野生java研究僧　　发布时间：2022-06-16 04:34:00　

标签：Springboot,ElementUi,评论,点赞,回复

1.概述

做一个项目，突然需要实现回复功能，所依记录一下此次的一个实现思路，也希望给别人分享一下，估计代码还是不够完善，有空在实现分页功能。话不多说直接看效果图。主要实现了评论，回复，点赞，取消点赞，如果是自己评论的还可以删除，删除的规则是如果该评论下还有回复，也一并删除。

我这里管理的是课程id，可以根据需要把课程id换为其他核心业务的id进行关联，也可以把表进行拆分，评论表和回复表。不过我为了方便就没有进行拆分。具体的实现思路我都写有详细步骤，看注释即可

效果图：

2.前端代码

1.html

<div>
<div v-clickoutside="hideReplyBtn" @click="inputFocus" class="my-reply">
<el-avatar class="header-img" :size="40" :src="userAvatar"></el-avatar>
<div class="reply-info">
<div
tabindex="0"
contenteditable="true"
id="replyInput"
spellcheck="false"
placeholder="输入评论..."
class="reply-input"
@focus="showReplyBtn"
@input="onDivInput($event)"
></div>
</div>
<div class="reply-btn-box" v-show="btnShow">
<el-button
class="reply-btn"
size="medium"
@click="sendComment"
type="primary"
>
发表评论
</el-button>
</div>
</div>
<div
v-for="(item, i) in comments"
:key="i"
class="author-title reply-father"
>
<el-avatar class="header-img" :size="40" :src="item.avatar"></el-avatar>
<div class="author-info">
<span class="author-name">{{ item.name }}</span>
<span class="author-time">{{ item.time }}</span>
</div>
<div class="icon-btn">
<span
v-if="item.memberId != myId"
@click="showReplyInput(i, j,item)"
>
<i class="iconfont el-icon-s-comment"></i>
{{ item.commentNum }}
</span>
<span v-else>
<i class="iconfont el-icon-s-comment" @click="noReply()"></i>
{{ item.commentNum }}
</span>
<span class="xin" @click="countlikeNumber('comment', i, 0, item.id)">
<i
class="el-icon-star-on"
v-if="item.likeListId.indexOf(myId) != -1"
>
</i>
<i class="el-icon-star-off" v-else></i>{{ item.likeCount }}
</span>
<span
class="el-icon-delete"
v-if="item.memberId == myId"
@click="deleteCommentById(item)"
></span>
</div>
<div class="talk-box">
<p>
<span class="reply">{{ item.content }}</span>
</p>
</div>

<div class="reply-box">
<div v-for="(reply, j) in item.reply" :key="j" class="author-title">
<el-avatar
class="header-img"
:size="40"
:src="reply.avatar"
></el-avatar>
<div class="author-info">
<span class="author-name">{{ reply.name }}</span>
<span class="author-time">{{ reply.time }}</span>
</div>
<div class="icon-btn">
<span
@click="
showReplyInput(i, j, reply)
"
v-if="reply.memberId != myId"
>
<i class="iconfont el-icon-s-comment"></i>
{{ reply.commentNum }}
</span>
<span v-else>
<i class="iconfont el-icon-s-comment" @click="noReply()"></i>
{{ reply.commentNum }}
</span>

<span @click="countlikeNumber('reply', i, j, reply.id)">
<i
class="el-icon-star-on"
v-if="reply.likeListId.indexOf(myId) != -1"
>
</i>
<i class="el-icon-star-off" v-else></i>{{ reply.likeCount }}
</span>
<span
class="el-icon-delete"
v-if="reply.memberId == myId"
@click="deleteCommentById(reply)"
></span>
</div>
<div class="talk-box">
<p>
<b style="color: red">回复 {{ reply.fromName }}:</b>
<span class="reply">{{ reply.content }}</span>
</p>
</div>
<div class="reply-box"></div>
</div>
</div>

<div v-show="_inputShow(i)" class="my-reply my-comment-reply">
<el-avatar
class="header-img"
:size="40"
:src="userAvatar"
></el-avatar>
<div class="reply-info">
<div
tabindex="0"
contenteditable="true"
spellcheck="false"
:placeholder="replyMessage"
@input="onDivInput($event)"
class="reply-input reply-comment-input"
></div>
</div>
<div class="reply-btn-box">
<el-button
class="reply-btn"
size="medium"
@click="sendCommentReply(i)"
type="primary"
>
发表回复
</el-button>
</div>
</div>
</div>
</div>

2.css

.my-reply {
padding: 10px;
background-color: #fafbfc;
}
.my-reply .header-img {
display: inline-block;
vertical-align: top;
}
.my-reply .reply-info {
display: inline-block;
margin-left: 5px;
width: 80％;
}
@media screen and (max-width: 1200px) {
.my-reply .reply-info {
width: 80％;
}
}
.my-reply .reply-info .reply-input {
min-height: 20px;
line-height: 22px;
padding: 10px 10px;
color: #ccc;
background-color: #fff;
border-radius: 5px;
}
.my-reply .reply-info .reply-input:empty:before {
content: attr(placeholder);
}
.my-reply .reply-info .reply-input:focus:before {
content: none;
}
.my-reply .reply-info .reply-input:focus {
padding: 8px 8px;
border: 2px solid blue;
box-shadow: none;
outline: none;
}
.my-reply .reply-btn-box {
height: 25px;
display: inline-block;

}
.my-reply .reply-btn-box .reply-btn {
position: relative;
float: right;
margin-left: 15px;
}
.my-comment-reply {
margin-left: 50px;
}
.my-comment-reply .reply-input {
width: flex;
}
.author-title:not(:last-child) {
border-bottom: 1px solid rgba(74, 136, 199, 0.3);
}
.reply-father {
padding: 10px;
}
.reply-father .header-img {
display: inline-block;
vertical-align: top;
}
.reply-father .author-info {
display: inline-block;
margin-left: 5px;
width: 60％;
height: 40px;
line-height: 20px;
}
.reply-father .author-info span {
display: block;
cursor: pointer;
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
}
.reply-father .author-info .author-name {
color: #000;
font-size: 18px;
font-weight: bold;
}
.reply-father .author-info .author-time {
font-size: 14px;
}
.reply-father .author-info .author-count{
font-size: 15px; color: blue;
}
.reply-father .icon-btn {
width: 30％;
padding: 0 !important ;
float: right;
}
@media screen and (max-width: 1200px) {
.reply-father .icon-btn {
width: 20％;
padding: 7px;
}
}
.reply-father .icon-btn span {
cursor: pointer;
}
.reply-father .icon-btn .iconfont {
margin: 0 5px;
}
.reply-father .talk-box {
margin: 0 50px;
}
.reply-father .talk-box p {
margin: 0;
}
.reply-father .talk-box .reply {
font-size: 16px;
color: #000;
}
.reply-father .reply-box {
margin: 10px 0 0 50px;
background-color: #efefef;
}

3.js

<script>
import commentApi from "@/api/comment";
import courseApi from "@/api/course";
import cookie from "js-cookie";

const clickoutside = {
// 初始化指令
bind(el, binding, vnode) {
function documentHandler(e) {
// 这里判断点击的元素是否是本身，是本身，则返回
if (el.contains(e.target)) {
return false;
}
// 判断指令中是否绑定了函数
if (binding.expression) {
// 如果绑定了函数则调用那个函数，此处binding.value就是handleClose方法
binding.value(e);
}
}
// 给当前元素绑定个私有变量，方便在unbind中可以解除事件监听
el.vueClickOutside = documentHandler;
document.addEventListener("click", documentHandler);
},
update() {},
unbind(el, binding) {
// 解除事件监听
document.removeEventListener("click", el.vueClickOutside);
delete el.vueClickOutside;
},
};

Date.prototype.format = function (fmt) {
var o = {
"M+": this.getMonth() + 1, //月份
"d+": this.getDate(), //日
"h+": this.getHours(), //小时
"m+": this.getMinutes(), //分
"s+": this.getSeconds(), //秒
"q+": Math.floor((this.getMonth() + 3) / 3), //季度
S: this.getMilliseconds(), //毫秒
};
if (/(y+)/.test(fmt)) {
fmt = fmt.replace(
RegExp.$1,
(this.getFullYear() + "").substr(4 - RegExp.$1.length)
);
}
for (var k in o) {
if (new RegExp("(" + k + ")").test(fmt)) {
fmt = fmt.replace(
RegExp.$1,
RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length)
);
}
}
return fmt;
};

export default {
created() {
// 将用户数据从本地cookie获取到
this.getUserInfo();
// 获取评论数据
this.initCommentList(this.course.id);
},
mounted() {},
data() {
return {

course: {
courseId: "",
},

btnShow: false,
index: "0",
replyComment: "",
subIndex: "0",
userName: "", // 当前用户name
userAvatar: "", // 当前用户头像
myId: null, // 当前用户id
replyMessage:"",
comments: [],
current:{}, // 当前被点击的评论对象
};
},
methods: {

// 将cookie的用户信息提取出来
getUserInfo() {
let user = cookie.get("userInfo");
if (user) {
let userInfo = JSON.parse(user);
this.userName = userInfo.nickname;
this.userAvatar = userInfo.avatar;
this.myId = userInfo.id;
}
},
// 获取评论数据
initCommentList(courseId) {
commentApi.getCommentList(courseId).then((response) => {
// 先将获取到的数据进行转换
let commentList = response.data.commentList;
for (let i = 0; i < commentList.length; i++) {
// 先将父级评论转化likeListId为数组
commentList[i].likeListId = commentList[i].likeListId.split(",");
// 找到子级评论将likeListId为数组
for (let j = 0; j < commentList[i].reply.length; j++) {
commentList[i].reply[j].likeListId =
commentList[i].reply[j].likeListId.split(",");
}
}
this.comments = commentList;
});
},
// 验证用户是否登录
userIsLogin(){
let user = cookie.get("userInfo");
if(user==null){
this.$confirm('评论操作需要先登录，是否现在跳转到登录页面?', '温馨提示', {
confirmButtonText: '是',
cancelButtonText: '否',
type: 'warning'
}).then(() => {
this.$router.push({path: "/login"});
}).catch(() => {
this.$message({
type: 'success',
message: '已经为您取消跳转到登录页面'
});
});
return "no"
}
return "yes"
},
/**
* 传递一个对象过来，将其深拷贝，不会在共用同一个引用
* targetObj:需要拷贝的对象
*
*/
copyObject(targetObj,type){

let comment = {...targetObj}
// 装换为以,号分割的字符串 [因为后台采用的是String进行存储]
comment.likeListId = comment.likeListId.join(",")
// 删除掉该属性，不然后台接收会报错
delete comment.reply
return comment;

},
// 输入框被点击是触发
inputFocus() {
var replyInput = document.getElementById("replyInput");
replyInput.style.padding = "8px 8px";
replyInput.style.border = "2px solid blue";
replyInput.focus();
},
// 显示回复按钮
showReplyBtn() {
this.btnShow = true;
},
// 提示不能给自己回复
noReply() {
this.$message({
message: "对不起!暂不支持自己给自己回复",
type: "warning",
});
},
// 隐藏回复按钮
hideReplyBtn() {
this.btnShow = false;
replyInput.style.padding = "10px";
replyInput.style.border = "none";
},
/**
* 显示输入框[评论和回复共用]
* i：顶级评论下标
* j：子级评论下标
* current:当前被点击的评论记录
*
*/
showReplyInput(i, j,current ) {
this.current=current
if (current.fatherId === "-1") {
this.parentId = current.id;
} else {
this.parentId = current.fatherId;
}
this.replyMessage = "回复:" + current.name;
this.comments[this.index].inputShow = false;
this.index = i;
this.comments[i].inputShow = true;
this.toName = current.name;
this.toId = current.id;
this.subIndex = j == "0" ? "0" : j;
},
/**
* 根据id删除评论(前提是该评论是当前用户所评论的)
*/
deleteCommentById(current) {
let comment = this.copyObject(current)
console.log("current=",current)
commentApi.deleteCommentById(comment).then((response) => {
if (response.success) {
this.$message({
showClose: true,
type: "success",
message: "删除成功",
});
// 重新获取获取评论数据
this.initCommentList(this.course.id);
}
});
},

/**
*
* 统计点赞数量
* type：是回复还是评论
* i:一级评论
* j:二级评论
*/
countlikeNumber(type, i, j, id) {
// 判断用户是否登录
if( this.userIsLogin()=="no") return;

const commentObje = type == "comment" ? this.comments[i] : this.comments[i].reply[j];
let list = commentObje.likeListId;

if (list.length === 0 || list.indexOf(this.myId) == -1) {
//在已经点赞的列表中未找到userId
commentObje.isLike = true;
commentObje.likeCount += 1;
commentObje.likeListId.push(this.myId);

// 将对象复制一份并且去除掉reply属性,避免后台接收数据出现异常
let comment = this.copyObject(commentObje)
// 发送请求到后台修改点赞数量
commentApi.updateLikeCount(comment).then(response=>{
if(response.success){
// 重新获取获取评论数据
this.initCommentList(this.course.id);
this.$message({
type:"success",
message:"点赞成功"
})
}
})
console.log("点赞+1", commentObje.like, commentObje.likeListId);
} else {
const index = list.indexOf(this.myId);
commentObje.isLike = false;
commentObje.likeCount -= 1;
commentObje.likeListId.splice(index, 1);
console.log("点赞-1", commentObje.likeListId);

let comment = this.copyObject(commentObje)

// 发送请求到后台修改点赞数量
commentApi.updateLikeCount(comment).then(response=>{
if(response.success){
// 重新获取获取评论数据
this.initCommentList(this.course.id);
this.$message({
type:"success",
message:"取消点赞成功"
})
}
})
}

console.log("commentObje=", commentObje);

},
// 是否显示输入框
_inputShow(i) {
return this.comments[i].inputShow;
},
// 发送评论
sendComment() {

if( this.userIsLogin()=="no") return;

if (!this.replyComment) {
this.$message({
type: "warning",
message: "评论不能为空",
});
} else {
// 评论内容对象
let object = {};
let input = document.getElementById("replyInput");
object.courseId = this.course.id;
object.name = this.userName;
object.content = this.replyComment;
object.avatar = this.userAvatar;
object.commentNum = 0;
object.likeCount = 0;
object.fromId="-1"
object.memberId = this.myId;
object.isLike = false;
object.likeListId = "0,0";
object.parentId = "-1";
object.time = new Date().format("yyyy-MM-dd hh:mm:ss");
this.replyComment = "";
input.innerHTML = "";
commentApi.addComment(object,this.current).then((response) => {
if (response.success) {
// 重新获取获取评论数据
this.initCommentList(this.course.id);
this.$message({
type: "success",
message: "评论成功",
});
}
});
}
},
// 发送回复
sendCommentReply(i) {
if( this.userIsLogin()=="no") return;
if (!this.replyComment) {
this.$message({
showClose: true,
type: "warning",
message: "回复不能为空",
});
} else {
// 回复内容对象
let current = {};
if(this.current.parentId == "-1" ){
current.parentId = this.current.id
}else{
current.parentId = this.current.parentId
}
current.courseId = this.course.id;
current.name = this.userName;
current.memberId = this.myId;
current.content = this.replyComment;
current.avatar = this.userAvatar;
current.commentNum = 0;
current.likeCount = 0;
current.isLike = false;
current.likeListId = "0,0";
current.fromName = this.current.name;
current.fromId = this.current.id;
current.time = new Date().format("yyyy-MM-dd hh:mm:ss");

// 得到当前被点击的评论对象，修改他的回复条数
this.current.commentNum += 1
let parent = {...this.current}
parent.likeListId = parent.likeListId.join(",")
delete parent.reply // 删除掉该属性，不然后台接收会报错[后台采用的是String进行存储]
console.log("current=",current)
console.log("parent=",parent)
commentApi.addComment(current,parent).then((response) => {
if (response.success) {
// 重新获取获取评论数据
this.initCommentList(this.course.id);
this.$message({
showClose: true,
type: "success",
message: "回复成功",
});
}
});

// 清空输入框内容
this.replyComment = "";
document.getElementsByClassName("reply-comment-input")[i].innerHTML = "";
}
},
onDivInput: function (e) {
this.replyComment = e.target.innerHTML;
}
};
</script>
<style lang="scss">
@import "@/assets/css/comment.css";
</style>

4.api调用后台接口

import request from "@/utils/request";

export default {
// 根据课程id获取评论信息
getCommentList(courseId) {
return request({
url: `/serviceedu/edu-comment/getCommentList/${courseId}`,
method: "get",
});
},

// 添加一条评论记录
addComment(current,parent) {
return request({
url: `/serviceedu/edu-comment/addComment`,
method: "post",
data:{current,parent}
});
},

// 根据评论id删除一条记录
deleteCommentById(current) {
return request({
url: `/serviceedu/edu-comment/deleteCommentById`,
method: "delete",
data:current
});
},

// 修改评论的点赞数量
updateLikeCount(comment) {
return request({
url: `/serviceedu/edu-comment/updateLikeCount`,
method: "post",
data:comment
});
},

};

3.后端代码

1.数据库SQL

/*
Navicat Premium Data Transfer

Source Server : WindowsMysql
Source Server Type : MySQL
Source Server Version : 50732
Source Host : localhost:3306
Source Schema : guli_edu

Target Server Type : MySQL
Target Server Version : 50732
File Encoding : 65001

Date: 24/01/2022 22:54:47
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for edu_comment
-- ----------------------------
DROP TABLE IF EXISTS `edu_comment`;
CREATE TABLE `edu_comment` (
`id` char(19) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '主键id',
`course_id` varchar(19) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '课程id',
`teacher_id` char(19) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '讲师id',
`member_id` varchar(19) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '用户id',
`name` varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '用户昵称',
`avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '用户头像',
`content` varchar(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '评论内容',
`parent_id` char(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '父级评论id\r\n',
`comment_num` int(11) NULL DEFAULT NULL COMMENT '回复条数',
`like_count` int(11) NULL DEFAULT NULL COMMENT '点赞数量',
`is_like` tinyint(1) NULL DEFAULT 0 COMMENT '是否点赞',
`like_list_id` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '点赞id列表',
`input_show` tinyint(1) NULL DEFAULT 0 COMMENT '是否显示输入框',
`time` datetime(0) NULL DEFAULT NULL COMMENT '评论创建时间',
`from_id` char(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '回复记录id\r\n',
`from_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL COMMENT '回复人名称\r\n',
`gmt_modified` datetime(0) NOT NULL COMMENT '更新时间',
`gmt_create` datetime(0) NOT NULL COMMENT '创建时间',
`is_deleted` tinyint(1) UNSIGNED NOT NULL DEFAULT 0 COMMENT '逻辑删除 1（true）已删除， 0（false）未删除',
PRIMARY KEY (`id`) USING BTREE,
INDEX `idx_course_id`(`course_id`) USING BTREE,
INDEX `idx_teacher_id`(`teacher_id`) USING BTREE,
INDEX `idx_member_id`(`member_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '评论' ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of edu_comment
-- ----------------------------
INSERT INTO `edu_comment` VALUES ('123963852741', '1482334670241763330', '', '1484454710336294913', 'compass', 'https://thirdwx.qlogo.cn/mmopen/vi_32/1JYibUaLyibKXk4VDEvDGyEUgFNAGrIHibRY4iatO3atSD1YERDS6qZbbbdibNpnsPqYF7kJxicAGtehHAAjiajrrict7g/132', 'spring如何实现AOP功能?', '-1', 4, 2, 1, ',1191616288114163713,1484112436503019522', 0, '2021-12-01 15:42:35', '-1', NULL, '2022-01-24 13:32:50', '2022-01-23 15:42:31', 0);
INSERT INTO `edu_comment` VALUES ('123963852742', '1482334670241763330', '', '1191616288114163713', '马超', 'https://guli-edu-compass.oss-cn-hangzhou.aliyuncs.com/avatar/2022-01-16/g.png', 'Joinpoint(连接点)：在Sping程序中允许你使用通知或增强的地方，这种地方比较多，可以是方法前后，也可以是抛出异常的时，这里只提到了方法连接点，这是因为Spring只支持方法类型的连接点。再通俗一点就是哪些方法可以被增强（使用通知），这些方法称为连接点。', '123963852741', 1, 2, 1, ',1191616288114163713,1484112436503019522', 0, '2022-01-01 15:42:35', '123963852741', 'compass', '2022-01-24 13:32:50', '2022-01-23 15:42:31', 0);
INSERT INTO `edu_comment` VALUES ('123963852743', '1482334670241763330', '', '1484112436503019522', '卡夫卡', 'https://guli-edu-compass.oss-cn-hangzhou.aliyuncs.com/avatar/2022-01-16/b80d2ab57bc0401db0aee83746e94b1d-file.png', 'Pointcut(切入点)：连接点是Spinrg程序中允许你使用通知或增强的地方，但是不是所有允许使用通知或增强的地方的地方都需要通知（增强）的，只有那些被我们使用了通知或者增强的地方才能称之为切入点。再通俗一点就是类中实际被增加（使用了通知）的方法称为切入点。', '123963852741', 1, 2, 1, '0,1191616288114163713,1484112436503019522', 0, '2020-01-01 15:42:35', '123963852741', 'compass', '2022-01-24 10:36:58', '2022-01-23 15:42:31', 0);
INSERT INTO `edu_comment` VALUES ('1485288657161056257', '1482334670241763330', '', '1484454710336294913', 'compass', 'https://thirdwx.qlogo.cn/mmopen/vi_32/1JYibUaLyibKXk4VDEvDGyEUgFNAGrIHibRY4iatO3atSD1YERDS6qZbbbdibNpnsPqYF7kJxicAGtehHAAjiajrrict7g/132', '前置通知(before):在执行业务代码前做些操作，比如获取连接对象', '-1', 1, 2, 1, ',1191616288114163713,1484112436503019522', 0, '2022-01-23 16:29:45', '-1', NULL, '2022-01-24 10:36:47', '2022-01-23 16:29:46', 0);
INSERT INTO `edu_comment` VALUES ('1485348435136622593', '1482334670241763330', '', '1191616288114163713', '马超', 'https://guli-edu-compass.oss-cn-hangzhou.aliyuncs.com/avatar/2022-01-16/g.png', 'Weaving（织入）：将 Aspect 和其他对象连接起来, 并创建 Adviced object 的过程', '1485288657161056257', 0, 2, 1, ',1191616288114163713,1484112436503019522', 0, '2022-01-23 20:27:18', '123963852741', 'compass', '2022-01-24 10:45:55', '2022-01-23 20:27:18', 0);
INSERT INTO `edu_comment` VALUES ('1485352669110349825', '1482334670241763330', '', '1191600824445046786', '司马懿', '\r\nhttps://img-blog.csdnimg.cn/2df9541c7fd044ff992ff234a29ca444.png?x-oss-process=image/resize,m_fixed,h_300', 'before advice, 在 join point 前被执行的 advice. 虽然 before advice 是在 join point 前被执行, 但是它并不能够阻止 join point 的执行, 除非发生了异常(即我们在 before advice 代码中, 不能人为地决定是否继续执行 join point 中的代码)', '123963852741', 0, 2, 1, ',1191616288114163713,1484112436503019522', 0, '2022-01-23 20:44:07', '123963852743', '卡夫卡', '2022-01-24 10:47:37', '2022-01-23 20:44:07', 0);
INSERT INTO `edu_comment` VALUES ('1485606518391865345', '1482334670241763330', '', '1484112436503019522', '卡夫卡', 'https://guli-edu-compass.oss-cn-hangzhou.aliyuncs.com/avatar/2022-01-16/b80d2ab57bc0401db0aee83746e94b1d-file.png', 'js中对象是引用数据类型，如果只是通过 objectB = objectA 简单的赋值，objectA 和 objectB 指向的是同一个地址', '123963852741', 0, 0, 0, '0,0', 0, '2022-01-24 13:32:49', '123963852742', '马超', '2022-01-24 13:32:50', '2022-01-24 13:32:50', 0);

SET FOREIGN_KEY_CHECKS = 1;

2.实体类

@Data
@ToString
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@ApiModel(value="EduComment对象", description="评论")
public class EduComment implements Serializable {

private static final long serialVersionUID = 1L;

@ApiModelProperty(value = "主键id")
@TableId(value = "id", type = IdType.ID_WORKER_STR)
private String id;

@ApiModelProperty(value = "课程id")
private String courseId;

@ApiModelProperty(value = "讲师id")
private String teacherId;

@ApiModelProperty(value = "用户id")
private String memberId;

@ApiModelProperty(value = "用户昵称")
private String name;

@ApiModelProperty(value = "用户头像")
private String avatar;

@ApiModelProperty(value = "评论内容")
private String content;

@ApiModelProperty(value = "父级评论id")
private String parentId;

@ApiModelProperty(value = "回复条数")
private Integer commentNum;

@ApiModelProperty(value = "点赞数量")
private Integer likeCount;

@ApiModelProperty(value = "是否点赞")
private Boolean isLike;

@ApiModelProperty(value = "点赞id列表")
private String likeListId;

@ApiModelProperty(value = "是否显示输入框")
private Boolean inputShow;

@ApiModelProperty(value = "评论创建时间")
private Date time;

@ApiModelProperty(value = "被回复的记录id")
private String fromId;

@ApiModelProperty(value = "回复人名称")
private String fromName;

@TableField(fill = FieldFill.INSERT_UPDATE)
@ApiModelProperty(value = "更新时间")
private Date gmtModified;

@ApiModelProperty(value = "创建时间")
@TableField(fill = FieldFill.INSERT)
private Date gmtCreate;

@TableLogic
@ApiModelProperty(value = "逻辑删除 1（true）已删除， 0（false）未删除")
private Boolean isDeleted;

@ApiModelProperty(value = "回复列表")
@TableField(exist = false)
private List<EduComment> reply;

}

3.daoMapper

@Repository
public interface EduCommentMapper extends BaseMapper<EduComment> {

/**
* 根据课程id获取到所有的评论列表
* @param courseId 课程id
* @return
*/
public List<EduComment> getAllCommentList(@Param("courseId") String courseId);

}

4.daoMapper实现

<?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="">

<resultMap id="ResultCommentList" type="EduComment">
<id property="id" column="id"/>
<result property="courseId" column="course_id"/>
<result property="teacherId" column="teacher_id"/>
<result property="memberId" column="member_id"/>
<result property="name" column="name"/>
<result property="avatar" column="avatar"/>
<result property="content" column="content"/>
<result property="parentId" column="parent_id"/>
<result property="commentNum" column="comment_num"/>
<result property="likeCount" column="like_count"/>
<result property="isLike" column="is_like"/>
<result property="likeListId" column="like_list_id"/>
<result property="inputShow" column="input_show"/>
<result property="fromId" column="from_id"/>
<result property="fromName" column="from_name"/>
<result property="time" column="time"/>
<result property="gmtModified" column="gmt_modified"/>
<result property="gmtCreate" column="gmt_create"/>
<result property="isDeleted" column="is_deleted"/>
<collection property="reply" ofType="EduComment" column="id" select="getReplyList">

</collection>
</resultMap>
<select id="getAllCommentList" resultMap="ResultCommentList" parameterType="String">
SELECT
id, course_id, teacher_id, member_id, name, avatar, content, parent_id,
comment_num, like_count, is_like, like_list_id, input_show, time,
from_id, from_name, gmt_modified, gmt_create, is_deleted
FROM
edu_comment
WHERE
parent_id = '-1'
AND course_id = #{courseId} AND is_deleted!=1;
</select>

<select id="getReplyList" resultMap="ResultCommentList">
select
id, course_id, teacher_id, member_id, name, avatar, content, parent_id,
comment_num, like_count, is_like, like_list_id, input_show, time,
from_id, from_name, gmt_modified, gmt_create, is_deleted
from edu_comment
where parent_id=#{id} AND is_deleted!=1;
</select>

</mapper>

5.service接口

public interface EduCommentService extends IService<EduComment> {

/**
* 根据课程id获取到所有的评论列表
* @param courseId 课程id
* @return
*/
public List<EduComment> getAllCommentList(@Param("courseId") String courseId);

/**
* 根据评论id删除一条记录[是本人评论的记录]
* @param comment 评论对象中包含回复人的id也包含被回复人的id
* @return
*/
public Integer deleteCommentById(EduComment comment);

/**
* 添加一条评论或回复记录
* @param current 当前提交的新comment对象
* @param parent 当前被点击回复的对象[评论时不需要，回复需要根据他进行判断]
* @param token 根据request对象取到token获取用户信息
* @return
*/
int addComment(EduComment current,EduComment parent, HttpServletRequest token);

/**
* 修改点赞数量
* @param eduComment 评论对象
* @return
*/
public int updateLikeCount(EduComment eduComment);

}

6.service接口实现

@Service
public class EduCommentServiceImpl extends ServiceImpl<EduCommentMapper, EduComment> implements EduCommentService {

@Autowired
private EduCommentMapper eduCommentMapper;

@Autowired
private UserCenterClient userCenterClient;

@Override
public List<EduComment> getAllCommentList(String courseId) {
return eduCommentMapper.getAllCommentList(courseId);
}

@Override
@Transactional
public Integer deleteCommentById(EduComment comment) {
int deleteCount=1;
try {
// 先查询该评论是不是一条顶级评论
QueryWrapper<EduComment> isParentWrapper = new QueryWrapper<>();
isParentWrapper.eq("id",comment.getId());
isParentWrapper.eq("parent_id",-1);
Integer count = eduCommentMapper.selectCount(isParentWrapper);
// 如果count大于0说明该评论是一条顶级评论，先删除他的子级评论
if (count>=0){
QueryWrapper<EduComment> wrapper = new QueryWrapper<>();
wrapper.eq("parent_id",comment.getId());
eduCommentMapper.delete(wrapper);
}
// 最后再删除父级评论
QueryWrapper<EduComment> wrapper = new QueryWrapper<>();
wrapper.eq("member_id",comment.getMemberId());
wrapper.eq("id",comment.getId());
eduCommentMapper.delete(wrapper);

// 找到该记录的顶级评论让他的评论数-1
String parentId = comment.getParentId();
String fromId = comment.getFromId();
if (!StringUtils.isEmpty(parentId) && parentId.equals(fromId)){
EduComment eduComment = this.getById(parentId);
if (eduComment!=null){
eduComment.setCommentNum(eduComment.getCommentNum()-1);
this.updateLikeCount(eduComment);
}
}

// 考虑到不是顶级记录的直接子记录的情况 fromId:表示该记录回复的是那一条记录
if (!StringUtils.isEmpty(parentId) && !parentId.equals(fromId)){
// 更新他的直接父级
EduComment father = this.getById(fromId);
if (father!=null){
father.setCommentNum(father.getCommentNum()-1);
this.updateLikeCount(father);
}
// 更新他的跟节点评论数量
EduComment root = this.getById(parentId);
if (root!=null){
root.setCommentNum(root.getCommentNum()-1);
this.updateLikeCount(root);
}
}

}catch (Exception e){
e.printStackTrace();
deleteCount = -1;
}
return deleteCount ;

}

@Override
@Transactional
public int addComment(EduComment current, EduComment parent ,HttpServletRequest token) {

// mybatis-plus总是出现逻辑删除修改返回的影响条数为0的情况，所有进行异常捕捉，捕捉到异常返回-1表示失败
try {

if (StringUtils.isEmpty(token)){
throw new GuLiException(20001,"对不起!添加失败");
}
// 从请求头中根据token获取用户id
String result = JwtUtils.getMemberIdByJwtToken(token);
if (result.equals("error")){
throw new GuLiException(20001,"登录时长过期，请重新登录");
}

// 是一条顶级评论，直接进行添加操作如果他的parentId=-1那就是顶级评论[发表评论]
if (current!=null && !StringUtils.isEmpty(current.getParentId()) && current.getParentId().equals("-1")){
// 如果从token中解析出来的memberId等于提交数据中MemberId就评论成功，否则失败
if (result.equals(current.getMemberId())){
return eduCommentMapper.insert(current);
}
}

// 如果能直接到这里，说明是一条回复评论
if (parent!=null && StringIsEmpty.isEmpty(parent.getId(),parent.getParentId())){

// 修改当前被回复的记录的总回复条数+1 [前端传递过来的时候已经+1，直接按照id修改即可]
this.updateLikeCount(parent);
// 根据parentId查询一条记录
EduComment root = this.getById(parent.getParentId());
if (root!=null && root.getParentId().equals("-1")){
// 根据当前被回复的记录找到顶级记录，将顶级记录也+1
root.setCommentNum(root.getCommentNum()+1);
this.updateLikeCount(root);
}
// 如果从token中解析出来的memberId等于提交数据中MemberId就评论成功，否则失败
if (result.equals(current.getMemberId())){
return eduCommentMapper.insert(current);
}

}

}catch (Exception e){
e.printStackTrace();
return -1;
}
return -1;
}

@Override
public int updateLikeCount(EduComment eduComment) {
return eduCommentMapper.updateById(eduComment);
}

}

7.controller

@Api(value = "EduCommentController",description = "前台评论控制器")
@CrossOrigin
@RestController
@RequestMapping("/serviceedu/edu-comment")
public class EduCommentController {

@Autowired
private EduCommentService eduCommentService;

@GetMapping("getCommentList/{courseId}")
@ApiOperation(value = "根据课程id查询评论信息",notes = "传入课程id")
public R getCommentList(@PathVariable String courseId){

return R.ok().data("commentList",eduCommentService.getAllCommentList(courseId));
}

@DeleteMapping("deleteCommentById")
@ApiOperation(value = "根据评论id删除一条记录",notes = "被点击的当前记录对象")
public R deleteCommentById(@RequestBody EduComment comment){
int updateCount = eduCommentService.deleteCommentById(comment);
return updateCount !=-1 ?R.ok():R.error();
}

@PostMapping("addComment")
@ApiOperation(value = "添加一条评论记录",notes = "json类型的评论对象")
public R addComment(@RequestBody Map<String,EduComment> map,HttpServletRequest token){
EduComment parent = map.get("parent");
EduComment current = map.get("current");

int updateCount = eduCommentService.addComment(current,parent,token);
return updateCount!=-1?R.ok():R.error();
}

@PostMapping("updateLikeCount")
@ApiOperation(value = "修改点赞数量",notes = "传递完整的EduComment对象")
public R updateLikeCount(@RequestBody EduComment comment){

int updateLikeCount = eduCommentService.updateLikeCount(comment);
return updateLikeCount>0?R.ok():R.error();
}

}

来源：https://blog.csdn.net/m0_46188681/article/details/122676767

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