欢迎大佬的来访，给大佬奉茶

一、文章背景

有一个业务需求是：实现一个聊天室，我和对方可以聊天；以及有一个消息列表展示我和对方（多个人）的聊天信息和及时接收到对方发来的消息并展示在列表上。
项目框架概述：后端使用SpringCloud Alibaba+mybatis-plus；前端是uniapp框架的微信小程序。

二、实现思路

可以使用什么实现？

1、最低效的方法：单纯使用数据库去存储发送的消息，在对方端一直去请求数据库的数据：频繁网络请求和IO请求；不可取！
2、使用websockt建立二者的连接，通过websockt服务器去进行消息的实时发送和接收，下面会详细说明。
3、使用Comet（长轮询）：通过HTTP长连接（如Ajax），服务器可以实时向客户端推送消息，客户端再将消息显示出来。

使用CIM+websockt实现的优点是什么？

CIM是什么？

CIM是一套完善的消息推送框架，可应用于信令推送，即时聊天，移动设备指令推送等领域。开发者可沉浸于业务开发，不用关心消息通道链接，消息编解码协议等繁杂处理。CIM仅提供了消息推送核心功能，和各个客户端的集成示例，并无任何业务功能，需要使用者自行在此基础上做自己的业务
CIM项目的分享：CIM项目分享

业务的实现思路

双人聊天：需要两个人能实时对话并且展示我和对方的头像及消息分布在屏幕两侧；已经有历史消息的需要在一进入页面时就将历史消息进行展示；
消息列表展示：需要及时接收到其他人给我发的消息并且展示的是最新的一条消息。

三、数据库中涉及的表

四、业务UML图

双人聊天类图+NS图

持久化消息数据到mysql数据库中

消息列表展示类图+NS图

五、业务代码

后端代码

bootstrap配置文件（配置模块信息、中间件配置信息等）

格式一定要正确

server:port: 6644servlet:context-path: /message
spring:application:name: prosper-messageprofiles:active: localcloud:nacos:config:server-addr: 你的IP地址:8848 #nacos地址namespace: 你的命名空间名称file-extension: yamlextension-configs:- data-id: 你的common模块配置名称（我将数据库等公共性配置抽到了common模块中）refresh: true

nacos配置

#cim接口地址
cimUrl: http://cim.tfjy.tech:9000/api/message/sendAll
cimContactMerchantUrl: http://cim.tfjy.tech:9000/api/message/send

controller层

package com.tfjybj.controller;import com.alibaba.nacos.common.model.core.IResultCode;
import com.tfjybj.entity.MessageEntity;
import com.tfjybj.exception.FrontResult;
import com.tfjybj.exception.codeEnum.ResultCodeEnum;
import com.tfjybj.exception.codeEnum.ResultMsgEnum;
import com.tfjybj.pojo.MessageListPojo;
import com.tfjybj.pojo.SendMessagePojo;
import com.tfjybj.service.ContactMerchantService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;
import java.util.Objects;@Api(tags = "联系商家")
@RestController
@RequestMapping("/Business")
public class ContactMerchantController {@Autowiredprivate ContactMerchantService contactMerchantService;@ApiOperation(value = "商家发消息")@PostMapping("/contactMerchant")public FrontResult contactMerchant(@RequestBody SendMessagePojo sendMessagePojo){boolean result= contactMerchantService.sendMessage(sendMessagePojo);if (result=true){return FrontResult.build(ResultCodeEnum.SUCCESS.getCode(), ResultMsgEnum.FIND_SUCCESS.getMsg(), result);}return FrontResult.build(ResultCodeEnum.FAIL.getCode(), ResultMsgEnum.FIND_FAIL.getMsg(), null);}/*** @Description:  通过发送者UserId和接受者receiverId按照时间倒序查询聊天室消息* @param: Long userId,Long receiverId* @return: List<MessageEntity>**/@ApiOperation(value = "查询聊天室中的消息")@GetMapping("/getMessageContent")public FrontResult getMessageContent( Long userId, Long receiverId){List<MessageEntity> messageEntities= contactMerchantService.getMessagesByUserIdAndReceiverId(userId,receiverId);if (Objects.isNull(messageEntities)){return FrontResult.build(ResultCodeEnum.FAIL.getCode(), ResultMsgEnum.FIND_FAIL.getMsg(), null);}else {return FrontResult.build(ResultCodeEnum.SUCCESS.getCode(), ResultMsgEnum.FIND_SUCCESS.getMsg(), messageEntities);}}
/** @Description:根据sellerId查询与该买家进行过聊天的所有人的最后一条消息
*/@ApiOperation(value = "根据sellerId查询与该买家进行过聊天的所有人的最后一条消息")@GetMapping("/getMessageListByUserId")public FrontResult getMessageListByUserId( Long userId){List<MessageListPojo> messageEntities= contactMerchantService.getMessageListByUserId(userId);if (Objects.isNull(messageEntities)){return FrontResult.build(ResultCodeEnum.FAIL.getCode(), ResultMsgEnum.FIND_SUCCESS.getMsg(), "暂无数据");}return FrontResult.build(ResultCodeEnum.SUCCESS.getCode(), ResultMsgEnum.FIND_SUCCESS.getMsg(), messageEntities);}}

service接口

package com.tfjybj.service;import com.tfjybj.entity.MessageEntity;
import com.tfjybj.pojo.MessageListPojo;
import com.tfjybj.pojo.SendMessagePojo;
import io.swagger.models.auth.In;import java.util.List;public interface ContactMerchantService {boolean sendMessage(SendMessagePojo sendMessagePojo);List<MessageEntity> getMessagesByUserIdAndReceiverId(Long userId, Long receiverId);List<MessageListPojo> getMessageListByUserId(Long userId);
}

service实现层

package com.tfjybj.service.impl;import com.alibaba.fastjson.JSONObject;
import com.tfjybj.entity.MessageEntity;
import com.tfjybj.mapper.MessageMapper;
import com.tfjybj.pojo.MessageListPojo;
import com.tfjybj.pojo.SendMessagePojo;
import com.tfjybj.pojo.UserShopInfoPojo;
import com.tfjybj.service.ContactMerchantService;
import com.tfjybj.service.UserShopRoleService;
import lombok.extern.log4j.Log4j2;
import net.sf.jsqlparser.expression.LongValue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import com.tfjybj.utils.*;import javax.annotation.Resource;
import java.nio.charset.StandardCharsets;
import java.text.MessageFormat;
import java.util.*;import static com.tfjybj.utils.CommonAttribute.ZERO_INT;@Log4j2
@Service
public class ContactMerchantImpl implements ContactMerchantService {@Autowiredprivate RestTemplate restTemplate;@Resourceprivate MessageMapper messageMapper;@Resourceprivate UserShopRoleService userShopRoleService;@Value("${cimContactMerchantUrl}")private String cimContactMerchantUrl;/*** @description: 联系商家，发消息**/@Overridepublic boolean sendMessage(SendMessagePojo sendMessagePojo) {try{if(Objects.isNull(sendMessagePojo)) {log.error("异常，原因是：在聊天室发消息功能中的sendMessage()中参数有null值");return false;}else {String action=sendMessagePojo.getAction();Long receiver=sendMessagePojo.getReceiver();Long sender=sendMessagePojo.getSender();String content=sendMessagePojo.getContent();MessageEntity messageEntity = new MessageEntity();messageEntity.setMessageContent(content);messageEntity.setUserId(sender);messageEntity.setMessageType(action);messageEntity.setReceiverId(receiver);messageEntity.setMessageRecordId((new SnowFlakeGenerateIdWorker(ZERO_INT,ZERO_INT).nextId()));// 添加聊天室信息记录String url = cimContactMerchantUrl + "?action=" + action + "&content=" + content + "&receiver=" + receiver + "&sender=" + sender;String response = restTemplate.postForObject(url, null, String.class);Integer result = messageMapper.insertContactMerchant(messageEntity);if (result>0){return true;}return false;}}catch (Exception e){log.error("异常，原因是：", e);return false;}}/*** @Description:  通过发送者UserId和接受者receiverId按照时间倒序查询聊天室消息* @param: Long userId,Long receiverId* @return: List<MessageEntity>**/@Overridepublic List<MessageEntity> getMessagesByUserIdAndReceiverId(Long userId, Long receiverId) {try{if (null!=userId && null!=receiverId){return messageMapper.selectMessageContent(userId, receiverId);}}catch (Exception e){log.error("异常，原因是：", e);return null;}return null;}//@Description:要根据前端传递的sellerId查询与该卖家进行过聊天的所有人的最后一条消息@Overridepublic List<MessageListPojo> getMessageListByUserId(Long userId){//查询最新一条消息内容，包括receiverId、userId、content、createTImeList<MessageListPojo> messageEntities = messageMapper.selectLatestMessages(userId);Set<Long> setUserId = new HashSet<>(); //声明一个set，放置receiverId和userId，用set集合进行去重for (MessageListPojo messageEntity:messageEntities) { // 遍历查询出来的内容，将每条信息的receiverId和userId放到set集合中setUserId.add(messageEntity.getSenderId());setUserId.add(messageEntity.getReceiverId());}List<Long> userIdList = new ArrayList<>(setUserId);//用所有的userId查询对应的店铺名称、店铺头像和个人姓名List<UserShopInfoPojo> userShopInfoPojos = userShopRoleService.queryMessageContent(userIdList);messageEntities.forEach(messageEntity -> {userShopInfoPojos.stream().filter(userShopInfoPojo -> userShopInfoPojo.getUserId().equals(messageEntity.getSenderId())).findFirst().ifPresent(userShopInfoPojo -> {messageEntity.setSenderShopName(userShopInfoPojo.getShopName());messageEntity.setSenderPicture(userShopInfoPojo.getShopPicture());messageEntity.setSenderName(userShopInfoPojo.getUserName());});userShopInfoPojos.stream().filter(userShopInfoPojo -> userShopInfoPojo.getUserId().equals(messageEntity.getReceiverId())).findFirst().ifPresent(userShopInfoPojo -> {messageEntity.setReceiverShopName(userShopInfoPojo.getShopName());messageEntity.setReceiverPicture(userShopInfoPojo.getShopPicture());messageEntity.setReceiverName(userShopInfoPojo.getUserName());});});return messageEntities;}
}

mapper接口

package com.tfjybj.mapper;import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.tfjybj.entity.MessageEntity;
import com.tfjybj.pojo.MessageListPojo;import java.util.List;public interface MessageMapper extends BaseMapper<MessageEntity> {List<MessageEntity> queryMapMessageByDate(String messageType);Integer insertContactMerchant(MessageEntity messageEntity);List<MessageEntity> selectMessageContent(Long userId,Long receiverId);List<MessageListPojo> selectLatestMessages(Long sellerId);
}

mapper.xml

<?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.tfjybj.mapper.MessageMapper"><resultMap type="com.tfjybj.entity.MessageEntity" id="ProsperMessageRecordMap"><result property="messageRecordId" column="message_record_id" jdbcType="INTEGER"/><result property="userId" column="user_id" jdbcType="INTEGER"/><result property="messageContent" column="message_content" jdbcType="VARCHAR"/><result property="messageType" column="message_type" jdbcType="VARCHAR"/><result property="createTime" column="create_time" jdbcType="TIMESTAMP"/><result property="updateTime" column="update_time" jdbcType="TIMESTAMP"/><result property="isDelete" column="is_delete" jdbcType="VARCHAR"/><result property="receiverId" column="receiver_id" jdbcType="INTEGER"/></resultMap><!--通过主键修改数据--><update id="update">update prosper_message_record<set><if test="userId != null">user_id = #{userId},</if><if test="messageContent != null and messageContent != ''">message_content = #{messageContent},</if><if test="messageType != null and messageType != ''">message_type = #{messageType},</if><if test="createTime != null">create_time = #{createTime},</if><if test="updateTime != null">update_time = #{updateTime},</if><if test="isDelete != null and isDelete != ''">is_delete = #{isDelete},</if></set>where message_record_id = #{messageRecordId}</update><!--通过主键删除--><delete id="deleteById">delete from prosper_message_record where message_record_id = #{messageRecordId}</delete><insert id="insertContactMerchant">insert into prosper_message_record(message_record_id,user_id, message_content, message_type,receiver_id)values (#{messageRecordId},#{userId}, #{messageContent}, #{messageType},#{receiverId})</insert><!--通过发送者UserId和接受者receiverId按照时间正序查询聊天室消息--><select id="selectMessageContent" resultMap="ProsperMessageRecordMap">SELECT  m.user_id, m.receiver_id,  m.create_time, m.message_contentFROM prosper_message_record mWHERE (m.user_id = #{userId} AND m.receiver_id = #{receiverId}) OR (m.receiver_id = #{userId} AND m.user_id = #{receiverId})AND m.is_delete = 0AND m.message_type = 2ORDER BY m.create_time</select><!--  要根据前端传递的sellerId查询与该卖家进行过聊天的所有人的最后一条消息  --><select id="selectLatestMessages" resultType="com.tfjybj.pojo.MessageListPojo">SELECT m.user_id as senderId, m.receiver_id as receiverId, m.message_content as content, m.create_time as createTimeFROM prosper_message_record mWHERE m.create_time IN (SELECT MAX(create_time)FROM prosper_message_recordWHERE user_id = #{sellerId} OR receiver_id = #{sellerId}GROUP BY CASEWHEN user_id = #{sellerId} THEN receiver_idWHEN receiver_id = #{sellerId} THEN user_idEND)AND message_type = 2 AND is_delete = 0ORDER BY m.create_time DESC</select>
</mapper>

代码具体的编写还是要根据自己的业务来实现，如有对这个需求和展示代码有疑惑的，欢迎各位大佬前来指导交流。

前端代码

代码使用uniapp框架编写的，并且是微信小程序的项目。
下面的代码是vue文件哈

双人聊天

<template><view class="content"><scroll-view :style="{ height: `${windowHeight - inputHeight}rpx` }" :scroll-top="scrollTop"class="scroll-container" id="scrollview" scroll-y><view id="msglistview" class="chat-body"><!-- 聊天 --><view v-for="(item, idx) in chatList" :key="idx" :value="fileList":class="item.isself ? 'chatself' : 'chatother'"><!-- 如果个人头像不为空且是自己发送的消息，则显示自己个人中心的头像 --><image v-if="personalAvatar != '' && shopid != '' && item.isself" :src="item.sellerPicture"style="width: 80rpx;height: 80rpx;margin-left: 20rpx;"></image><!-- 否则，如果是自己发送的消息，显示默认头像 --><image v-else-if="item.isself" src="/static/user2.png"style="width: 80rpx;height: 80rpx;margin-left: 20rpx;"></image><!-- 否则，如果对方头像不为空且不是自己发送的消息，则显示对方个人中心的头像 --><image v-else-if="otherAvatar != '' && shopid != '' && !item.isself" :src="otherAvatar"style="width: 80rpx;height: 80rpx;margin-right: 20rpx;"></image><!-- 否则，如果不是自己发送的信息，则对方显示默认头像 --><image v-else src="/static/user1.png" style="width: 80rpx;height: 80rpx;margin-right: 20rpx;"></image><!-- 根据消息发送者是自己还是对方，应用不同的样式 --><view class="showStyle" :class="item.isself ? 'chatbgvS' : 'chatbgvO'">{{ item.msg }}</view></view></view></scroll-view><!-- input --><!-- <view class="chatinput">发送的图片按钮<image src="@/static/image.png" style="width:50rpx;height:50rpx;margin: 0rpx 20rpx;"></image><uni-easyinput class="inputtext" autoHeight v-model="contentValue" placeholder="请输入内容"></uni-easyinput>发送表情包的图片按钮 <image src="@/static/smile.png" style="width:50rpx;height:50rpx;margin:0rpx 20rpx;"></image></view> --><view class="chat-bottom" :style="{ height: `${inputHeight}rpx` }"><view class="send-msg" :style="{ bottom: `${keyboardHeight}rpx` }"><view class="uni-textarea"><textarea v-model="contentValue" maxlength="255" confirm-type="send" @confirm="sendMsg()":show-confirm-bar="false" :adjust-position="false" @linechange="sendHeight" @focus="focus"@blur="blur" auto-height></textarea></view><button @click="sendMsg()" class="send-btn">发送</button></view></view></view>
</template><script>
import { querySelInfoBySelIdBySelAliId, selectSellerShopInfo } from '@/api/seller/index.js';
import { sendMessage, historicalChatRecords } from "../../../api/message/index.js";
import { generateUUID, getTimeStamp } from "@/api/message/webSocket.js";
import {webSocketUrl
} from '@/request/config.js'
import { ZEROZEROZEROZERO_STRING } from '../../../utils/constant.js';
export default {data() {return {//键盘高度keyboardHeight: 0,//底部消息发送高度bottomHeight: 0,//滚动距离scrollTop: 0,contentValue: "",//聊天内容chatList: [],//商家买家发信息的数据对象data: {action: "2",//聊天室的标识content: "",receiver: "",sender: ""},customerId: "",//买家idoperatorId: "",//卖家idpersonalAvatar: "",//个人头像otherAvatar: "",//对方头像fileList: [], //商家头像};},computed: {windowHeight() {return this.rpxTopx(uni.getSystemInfoSync().windowHeight)},// 键盘弹起来的高度+发送框高度inputHeight() {return this.bottomHeight + this.keyboardHeight}},updated() {//页面更新时调用聊天消息定位到最底部this.scrollToBottom();},//关闭当前页面时断开连接onHide() {uni.closeSocket({success: () => {console.log('WebSocket连接关闭成功!');}})},//当开打页面的时候进行websocket连接onShow() {const sellerId = uni.getStorageSync("sellerId");var socketTask = uni.connectSocket({url: webSocketUrl, //仅为示例，并非真实接口地址。success: () => { }});//相当于进行cim的登录socketTask.onOpen(function (res) {//从本地获取sellerIdconst content = {"key": "client_bind","timestamp": getTimeStamp(),"data": {"uid": sellerId,"appVersion": "1.0.0","channel": "web","packageName": "com.farsunset.cim","deviceId": generateUUID(),"deviceName": "Chrome"}}let data = {};data.type = 3;data.content = JSON.stringify(content);socketTask.send({data: JSON.stringify(data),success: () => {console.log('发送消息成功！');},complete: () => {console.log('发送消息完成！');}});});//接收消息socketTask.onMessage(async (message) => {const object = JSON.parse(message.data);if (object.type == 1) {console.log("给服务端发送PONG");//给服务端发送ponglet pongData = {};pongData.type = 1;pongData.content = "PONG";socketTask.send({data: JSON.stringify(pongData),success: () => {console.log('PONG消息成功！');},});return;}//获取对方的消息内容if (JSON.parse(object.content).content != undefined) {//如果自己给自己发消息，消息页面左边部分不显示内容if (this.operatorId != this.customerId) {const newMsgReceiver = {isself: false,msg: JSON.parse(object.content).content}this.chatList.push(newMsgReceiver);} else {// 更新头像渲染await this.getOtherAvatar();}}});socketTask.onError((res) => {console.log('WebSocket连接打开失败，请检查！');});},onLoad(options) {this.customerId = options.customId;this.operatorId = options.operatorId;this.queryHistoricalChatRecords();//查询历史聊天记录uni.offKeyboardHeightChange()//用UniApp的uni.onKeyboardHeightChange方法来监听键盘高度的变化，并在键盘高度变化时执行相应的逻辑。uni.onKeyboardHeightChange(res => {this.keyboardHeight = this.rpxTopx(res.height - 30)if (this.keyboardHeight < 0) this.keyboardHeight = 0;})},mounted() {this.getShopIdByUserId();//获取自己的个人中心头像this.getPersonalAvatar();//获取对方的个人中心头像this.getOtherAvatar();},methods: {focus() {this.scrollToBottom()},blur() {this.scrollToBottom()},// 监视聊天发送栏高度sendHeight() {setTimeout(() => {let query = uni.createSelectorQuery();query.select('.send-msg').boundingClientRect()query.exec(res => {this.bottomHeight = this.rpxTopx(res[0].height)})}, 10)},// px转换成rpxrpxTopx(px) {let deviceWidth = wx.getSystemInfoSync().windowWidthlet rpx = (750 / deviceWidth) * Number(px)return Math.floor(rpx)},// 滚动至聊天底部scrollToBottom(e) {setTimeout(() => {let query = uni.createSelectorQuery().in(this);query.select('#scrollview').boundingClientRect();query.select('#msglistview').boundingClientRect();query.exec((res) => {if (res[1].height > res[0].height) {this.scrollTop = this.rpxTopx(res[1].height - res[0].height)}})}, 15)},//发送消息async sendMsg() {if (uni.getStorageSync("sellerId") == this.operatorId) {this.data.receiver = this.customerIdthis.data.sender = this.operatorId} else {this.data.receiver = this.operatorIdthis.data.sender = this.customerId}if (this.data.receiver == this.data.sender) {}this.data.content = this.contentValue.trim(); //去除首尾空格const regex = /^[\s\n]*$/; // 匹配不包含空格和回车的文本if (regex.test(this.data.content)) {uni.showToast({title: '请输入有效文本',icon: 'none'});} else {// 进行提交操作await sendMessage(this.data);const newMsgSend = {isself: true,msg: this.contentValue}this.chatList.push(newMsgSend)this.contentValue = ""// 更新头像渲染await this.getPersonalAvatar();}},//查询历史聊天记录async queryHistoricalChatRecords() {const { code, data } = await historicalChatRecords(this.customerId, this.operatorId)for (let i = 0; i < data.length; i++) {if (data[i].userId == uni.getStorageSync("sellerId")) {const myChat = {isself: true,msg: data[i].messageContent,}this.chatList.push(myChat)} else {const otherChat = {isself: false,msg: data[i].messageContent,}this.chatList.push(otherChat)}}},//获取用户的shopIdasync getShopIdByUserId() {this.userId = JSON.parse(uni.getStorageSync('sellerId'))const { code, data } = await selectSellerShopInfo(this.userId)if (ZEROZEROZEROZERO_STRING == code && this.userId != null) {this.shopid = data[0];uni.setStorageSync('shopId', this.shopid)this.getPersonalAvatar();}else {this.chatList.forEach(item => {item.sellerPicture = item.isself ? "/static/user2.png" : "/static/user1.png";});}},//获取对方的个人中心头像async getOtherAvatar() {const { code, data } = await querySelInfoBySelIdBySelAliId(this.operatorId);this.otherAvatar = data.sellerPicture;},//获取个人中心的头像async getPersonalAvatar() {this.sellerId = uni.getStorageSync('sellerId')const { code, data } = await querySelInfoBySelIdBySelAliId(this.customerId);this.personalAvatar = data.sellerPictureif (ZEROZEROZEROZERO_STRING == code) {//将data对象中的sellerPicture属性值添加到this.fileList数组中this.fileList.push({ url: data.sellerPicture });// 遍历this.chatList数组中的每个item对象this.chatList.forEach(item => {// 如果item对象的isself属性为true，并且this.sellerId等于this.customerIdif (item.isself && this.sellerId == this.customerId) {// 将this.personalAvatar赋给item对象的sellerPicture属性，显示自己个人中心的头像item.sellerPicture = this.personalAvatar;} else {// 将this.otherAvatar赋给item对象的sellerPicture属性，显示对方个人中心的头像item.sellerPicture = this.otherAvatar;}});}}}
}
</script><style lang="scss" scoped>
$sendBtnbgc: #4F7DF5;
$chatContentbgc: #C2DCFF;.showStyle{flex-wrap: wrap;display:flex
}
.scroll-container {::-webkit-scrollbar {display: none;width: 0 !important;height: 0 !important;-webkit-appearance: none;background: transparent;color: transparent;}
}.uni-textarea {padding-bottom: 70rpx;textarea {width: 537rpx;min-height: 75rpx;max-height: 500rpx;background: #FFFFFF;border-radius: 8rpx;font-size: 32rpx;font-family: PingFang SC;color: #333333;line-height: 43rpx;padding: 5rpx 8rpx;}
}.send-btn {display: flex;align-items: center;justify-content: center;margin-bottom: 70rpx;margin-left: 25rpx;width: 128rpx;height: 75rpx;background: $sendBtnbgc;border-radius: 8rpx;font-size: 28rpx;font-family: PingFang SC;font-weight: 500;color: #FFFFFF;line-height: 28rpx;
}.chat-bottom {width: 100%;height: 177rpx;background: #F4F5F7;transition: all 0.1s ease;
}.send-msg {display: flex;align-items: flex-end;padding: 16rpx 30rpx;width: 100%;min-height: 177rpx;position: fixed;bottom: 0;background: #EDEDED;transition: all 0.1s ease;
}.content {height: 100%;position: fixed;width: 100%;height: 100%;// background-color: #0F0F27;overflow: scroll;word-break: break-all;.chat-body {display: flex;flex-direction: column;padding-top: 23rpx;.self {justify-content: flex-end;}.item {display: flex;padding: 23rpx 30rpx;}}.chatself {display: flex;flex-direction: row-reverse;// align-items: center;// height: 120rpx;width: 90%;margin-left: 5%;// background-color: #007AFF;margin-top: 20rpx;margin-bottom: 10rpx;}.chatother {display: flex;// align-items: center;// height: 120rpx;width: 90%;margin-left: 5%;// background-color: #fc02ff;margin-top: 20rpx;margin-bottom: 10rpx;}.chatbgvS {color: #000000;padding: 20rpx 40rpx;max-width: calc(90% - 140rpx);background-color: $chatContentbgc;font-size: 27rpx;border-radius: 5px;}.chatbgvO {color: #000000;padding: 20rpx 40rpx;max-width: calc(90% - 140rpx);background-color: #FFFFFF;font-size: 27rpx;border-radius: 5px;}.send {color: golenrod;font-size: 12px;margin-right: 5px;}.chatinput {position: fixed;bottom: 0rpx;height: 70px;width: 100%;background-color: #ffffff;display: flex;// justify-content: space-between;align-items: center;.inputtext {width: calc(100% - 80rpx - 50rpx - 38rpx);color: #FFFFFF;font-size: 28rpx;}}
}
</style>

聊天列表

<template><view><uni-list><uni-list :border="true"><uni-list-chat  class="style" v-for="item in messageList" :key="item.createTime" :title="item.senderId === currentUser? item.receiverShopName: item.senderShopName" :avatar="item.senderId === currentUser? item.receiverPicture: item.senderPicture " :note="truncateText(item.content.replace(/\n/g, '\u00a0'))" :time="item.createTime" :badge-position="item.countNoread > 0 ? 'left' : 'none'" link@click="gotoChat(item.senderId === currentUser ? item.receiverId : item.senderId)"/></uni-list></uni-list><footer><view class="none"> <text>没有更多数据了</text></view></footer></view>
</template>
<script>
import {generateUUID,getTimeStamp
} from "@/api/message/webSocket.js";
import {webSocketUrl
} from '@/request/config.js'
import {queryMessageList
} from '@/api/message/index.js'
import {ZEROZEROZEROZERO_STRING,ZERO_INT,ONEONEONEONE_STRING
} from '../../../utils/constant';
export default {data() {return {//消息列表messageList: [],currentUser: ""};},//关闭当前页面时断开连接onHide() {uni.closeSocket({success: () => {console.log('WebSocket连接关闭成功!');}})},//当开打页面的时候进行websocket连接onShow() {const sellerId = uni.getStorageSync("sellerId");var socketTask = uni.connectSocket({url: webSocketUrl, //仅为示例，并非真实接口地址。success: () => { }});//相当于进行cim的登录socketTask.onOpen(function (res) {//从本地获取sellerIdconst content = {"key": "client_bind","timestamp": getTimeStamp(),"data": {"uid": sellerId,"appVersion": "1.0.0","channel": "web","packageName": "com.farsunset.cim","deviceId": generateUUID(),"deviceName": "Chrome"}}let data = {};data.type = 3;data.content = JSON.stringify(content);socketTask.send({data: JSON.stringify(data),success: () => {console.log('发送消息成功！');},complete: () => {console.log('发送消息完成！');}});});//接收消息socketTask.onMessage((message) => {const object = JSON.parse(message.data);if (object.type == 1) {console.log("给服务端发送PONG");//给服务端发送ponglet pongData = {};pongData.type = 1;pongData.content = "PONG";socketTask.send({data: JSON.stringify(pongData),success: () => {console.log('PONG消息成功！');},});return;}console.log("这个是object.content", object, JSON.parse(object.content))//获取对方的消息内容，如果不为空则替换最新的显示消息if (JSON.parse(object.content).content != undefined) {//获取用户idconst userId = JSON.parse(object.content).sender;//获取消息内容const lastMessage = JSON.parse(object.content).content;//根据消息中的id遍历消息集合中的id更新消息this.messageList.forEach(item => {if ((item.senderId === this.currentUser ? item.receiverId : item.senderId)  == userId) {item.content = lastMessage;}})}});socketTask.onError((res) => {console.log('WebSocket连接打开失败，请检查！');});},onLoad() {this.currentUser = uni.getStorageSync("sellerId");},onShow() {this.queryMessageLists();},methods: {truncateText(text) {const maxLength = 20; // 设置最大字符长度if (text.length > maxLength) {return text.substring(0, maxLength) + '...'; // 超过最大长度时截断并添加省略号} else {return text;}},gochat() {uni.navigateTo({url: "../chat/chat",});},formatTime(timestamp) {const date = new Date(timestamp * 1000);const year = date.getFullYear();const month = String(date.getMonth() + 1).padStart(2, "0");const day = String(date.getDate()).padStart(2, "0");const hours = String(date.getHours()).padStart(2, "0");const minutes = String(date.getMinutes()).padStart(2, "0");return `${year}-${month}-${day} ${hours}:${minutes}`;},gotoChat(operatorId) {uni.navigateTo({url: '/pages/views/message/Chat?customId=' + this.currentUser + "&operatorId=" + operatorId,})},//查询聊天列表async queryMessageLists() {const {code,data} = await queryMessageList(this.currentUser);if (ZEROZEROZEROZERO_STRING == code) {this.messageList = data;}}},
};
</script>
<style lang="less" scoped>
.style{white-space: nowrap;  overflow: hidden;  text-overflow: ellipsis;
}
.chat-custom-right {flex: 1;/* #ifndef APP-NVUE */display: flex;/* #endif */flex-direction: column;justify-content: space-between;align-items: flex-end;
}.chat-custom-text {font-size: 12px;color: #999;
}page {background-color: #f1f1f1;
}footer {height: 140rpx;width: 100%;.none,.yszy {width: 100%;height: 70rpx;line-height: 70rpx;text-align: center;}.none {font-size: 26rpx;font-weight: 900;text {font-weight: 500;color: #777;padding: 10rpx;}}.yszy {font-size: 26rpx;color: #777;}
}
</style>

配置文件（JS后缀）

以下是使用到的一些公共性配置文件
WebSockt.js

//生成UUID
export function generateUUID() {let d = new Date().getTime();let uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {let r = (d + Math.random() * 16) % 16 | 0;d = Math.floor(d / 16);return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);});return uuid.replace(/-/g, '');
}//获取时间戳
export function getTimeStamp() {return new Date().getTime();
}//字符串转Uint8Array
function toUint8Arr(str) {const buffer = [];for (let i of str) {const _code = i.charCodeAt(0);if (_code < 0x80) {buffer.push(_code);} else if (_code < 0x800) {buffer.push(0xc0 + (_code >> 6));buffer.push(0x80 + (_code & 0x3f));} else if (_code < 0x10000) {buffer.push(0xe0 + (_code >> 12));buffer.push(0x80 + (_code >> 6 & 0x3f));buffer.push(0x80 + (_code & 0x3f));}}return Uint8Array.from(buffer);
}

cim服务器路径

const webSocketUrl = '这里写你服务器的路径';export {webSocketUrl};

封装的request请求文件：复用（其中还增加了微信小程序的日志功能）

import Log from '../utils/Log.js'
import moment from 'moment'
import {ONEONEONEONE_STRING} from "@/utils/constant.js";const request = (config) => {// 拼接完整的接口路径,这里是在package.json里做的环境区分config.url = process.env.VUE_APP_BASE_URL+config.url;//判断是都携带参数if(!config.data){config.data = {};}config.header= {'Authorization': uni.getStorageSync("authToken"),// 'content-type': 'application/x-www-form-urlencoded'}let promise = new Promise(function(resolve, reject) {uni.request(config).then(responses => {// 异常if (responses[0]) {reject({message : "网络超时"});} else {let response = responses[1].data; // 如果返回的结果是data.data的，嫌麻烦可以用这个，return res,这样只返回一个dataresolve(response);}if(ONEONEONEONE_STRING == responses[1].data.code){//在微信提供的we分析上打印实时日志  https://wedata.weixin.qq.com/mp2/realtime-log/mini?source=25Log.error(config.url,"接口访问失败，请排查此问题")}}).catch(error => {reject(error);})})return promise;
};export default request;

用到的调用后端的api接口

import request from '@/request/request.js'; // 引入封装好的requestexport function delay(ms){return new Promise(resolve => setTimeout(resolve, ms));
}//休眠函数
export function sleep(delay) {var start = (new Date()).getTime();while((new Date()).getTime() - start < delay) {continue;}
}/*** 查询聊天列表* @param {Object} userId 用户id*/export function queryMessageList(userId) {return request({method: "get", // 请求方式url: '/message/Business/getMessageListByUserId?userId=' + userId})
}
//联系商家发消息
export function sendMessage(data) {return request({url: "/message/Business/contactMerchant",method: "POST",data})
}
//查询历史聊天记录
export function historicalChatRecords(receiverId,userId) {return request({url:"/message/Business/getMessageContent?receiverId="+receiverId+"&userId="+userId,method: "GET"})
}

constant.js(封装的常量类)：复用

/** @Descripttion: 统一管理常量* @version: 1.0/*** 数字*/export const ZERO_INT=0;export const ONE_INT=1;export const TWO_INT=2;export const THREE_INT=3;export const FOUR_INT=4;export const FIVE_INT=5;/*** 字符串*/
export const ZERO_STRING="0";
export const ONE_STRING="1";
export const TWO_STRING="2";
export const THREE_STRING="3";
export const FOUR_STRING="4";
export const FIVE_STRING="5";
export const NULL_STRING="null";
export const ZEROZEROZEROZERO_STRING="0000";  //后端请求返回码——执行成功
export const ONEONEONEONE_STRING="1111";  //后端请求返回码——执行失败

需要注意的点

cim服务器的路径需要时ws开头，和http类似；如果是微信小程序上必须是wss（安全协议）开头，和https类似（微信小程序要求！）

待优化点：持续更新中

我们可以看到，这两个功能中的前端代码里均有去进行websockt连接和cim登录等相同的代码，所以这里要抽出一个公共性的js文件进行复用！

五、配置CIM

在gitee上将文件拉下来
https://gitee.com/farsunset/cim
部署在服务器上，就是一个启动jar包的命令；
如果有需要可以找博主要一份jar包开机自启的配置。

CIM的数据结构

字段	类型	说明
id	long	唯一ID
sender	String	消息发送者ID
receiver	String	消息接收者ID
action	String	消息动作、类型
title	String	消息标题
content	String	消息正文
format	String	消息格式，例如聊天场景可用于文字、图片
extra	String	业务扩展数据字段
timestamp	long	消息13位时间戳

六、消息业务还可以使用什么技术

除了常见的数据库存储外，消息业务还可以使用一些消息队列（Message Queue，MQ）技术实现。MQ技术可以解耦消息发送者和接收者之间的关系，提高系统的可伸缩性和可扩展性，保证消息的可靠性和时效性，更好地支持分布式系统的消息传递。常见的MQ技术有RabbitMQ、Kafka、RocketMQ等。

七、总结

本文介绍了通过CIM和WebSocket技术实现实时消息通信的方法，实现了双人聊天和消息列表展示的功能。在介绍实现方法之前，先介绍了CIM和WebSocket的概念和优势。接下来，详细介绍了如何使用CIM和WebSocket实现双人聊天和消息列表展示的功能。其中，双人聊天主要包括前端页面的设计和后端代码的实现，通过WebSocket实现实时消息的推送和接收。消息列表展示主要是展示聊天记录和消息通知，通过数据库存储聊天记录和实时推送消息通知。最后，针对文章介绍的功能和实现方法，给出了一些优化和改进的建议，以及其他常见的消息技术的介绍。总体来说，本文介绍了一种简单易懂、实用可行的实时消息通信方案，对于需要实现实时消息传递的应用场景具有一定参考价值。