使用node+prisma和vue3实现一个群聊功能

后端代码编写

node环境初始化

新建一个空文件夹node，初始化node环境

npm init -y

修改 packages.json，只保留 scripts 和 dependencies

{
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "dependencies": {},
}

ts环境初始化

tsc --init

如果没有tsc命令，需要提前在全局安装 typescript

npm install typescript ts-node -g

已经安装过的可忽略

检查ts是否安装成功

tsc -v

执行完 tsc --init 会自动生成 tsconfig.json，修改里面的三个配置

"experimentalDecorators": true,                   
"emitDecoratorMetadata": true,  
"strict": false,  

1. “experimentalDecorators”: true
   • 含义: 启用对装饰器的实验性支持。装饰器是一种特殊类型的声明，它能够被附加到类声明、方法、访问符、属性或参数上。装饰器在 TypeScript 中是实验性的特性，这意味着它们可能在未来的版本中发生变化。
   • 用途: 如果你使用装饰器（例如 Angular 的装饰器），你需要启用这个选项。
2. “emitDecoratorMetadata”: true
   • 含义: 启用装饰器元数据的生成。装饰器元数据是编译器在装饰器上附加的额外信息，这些信息可以在运行时通过反射 API 访问。
   • 用途: 如果你需要使用反射 API 来访问装饰器元数据，你需要启用这个选项。
3. “strict”: false
   • 含义: 禁用所有严格类型检查选项。严格模式会启用一系列额外的类型检查规则，这些规则有助于捕获潜在的错误，但有时也会导致一些合法的代码无法通过检查。

依赖安装

在 package.json 添加如下依赖

{
  "scripts": {
    "start": "ts-node ./index.ts"
  },
  "dependencies": {
    "@prisma/client": "^5.19.1",
    "@types/express": "^4.17.21",
    "@types/node": "^22.5.5",
    "axios": "^1.7.7",
    "class-transformer": "^0.5.1",
    "class-validator": "^0.14.1",
    "express": "^4.21.0",
    "inversify": "^6.0.2",
    "inversify-express-utils": "^6.4.6",
    "reflect-metadata": "^0.2.2",
    "socket.io": "^4.8.0",
    "socket.io-client": "^4.8.0",
    "ts-node": "^10.9.2"
  }
}

然后执行 npm install 安装

引入Prisma

首先需要全局安装 prisma

npm install -g prisma

Prisma 官网 https://www.prisma.io/docs

然后再项目根目录执行下面的命令初始化一个基于mysql的项目

prisma init --datasource-provider mysql

此时的项目目录结构如下

在 prisma/schema.prisma 文件中编写表结构

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "mysql"
  url      = env("DATABASE_URL")
}

// 用户表
model User {
  id       Int    @id @default(autoincrement())
  userName String
}

// 消息表
model Message {
  id         Int      @id @default(autoincrement())
  text       String
  userId     Int
  createTime DateTime @default(now())
  userName   String
}

然后修改 .env 文件的数据库连接地址

DATABASE_URL="mysql://root:abc123@localhost:3306/hichat"

然后执行下面命令执行SQL语句创建表

prisma migrate dev

执行完成后，打开数据库就会发现自动帮我们创建好了表

编写DB

db/index.ts

用于全局共用一个PrismaClient实例

import { injectable, inject } from "inversify";
import { PrismaClient } from "@prisma/client";

@injectable()
export class PrismaDB {
  prisma: PrismaClient;

  // 自动注入
  constructor(@inject("PrismaClient") prisma: () => PrismaClient) {
    this.prisma = prisma();
  }
}

统一结果返回类

utils/Result.ts

export default class Result<T> {
    code: number | 200;
    data: T | null;
    msg: string;

    constructor(code: number | 200, data: T | null, msg?: string) {
        this.code = code;
        this.data = data;
        this.msg = msg;
    }

    static ok<T>(data?: T | null): Result<T> {
        return new Result<T>(200, data, "成功");
    }

    static err<T>(data?: T | null): Result<T> {
        return new Result<T>(500, data, "失败");
    }

    public setCode(code: number | 200) {
        this.code = code;
        return this;
    }

    public setData(data: T | null) {
        this.data = data;
        return this;
    }

    public setMsg(msg: string) {
        this.msg = msg;
        return this;
    }
}

User模块业务实现

service层

src/user/service.ts

import {injectable,inject} from "inversify"
import { PrismaDB } from "../../db"

@injectable()
export class UserService {
   // 自动注入prisma
   constructor(@inject(PrismaDB) private PrismaDB: PrismaDB) {}

   /**
    * 注册新用户
    */
   public async add(userName:string) {
     return await this.PrismaDB.prisma.user.create({
        data:{
           userName:userName
        }
     })
   }

   /**
    * 根据userName查询用户
    */
   public async getUserByUserName(userName:string) {
     return await this.PrismaDB.prisma.user.findFirst({
        where:{
           userName:userName
        }
     })
   }

   /**
    * 查询用户数量
    */
   public async getUserCount() {
     return await this.PrismaDB.prisma.user.count()
   }
}

controller层

src/user/controller.ts

import { inject } from "inversify";
import { controller, httpGet, httpPost } from "inversify-express-utils";
import { UserService } from "./service";
import { Request, Response } from "express";
import Result from "../../utils/Result";

@controller("/user")
export class UserController {
  constructor(@inject(UserService) private readonly server: UserService) {}

  /**
   * 添加用户
   * @param req 
   * @param res 
   */
  @httpPost("/add")
  public async addUser(req: Request, res: Response) {
    let { userName } = req.body;
    let result = await this.server.add(userName);
    res.send(Result.ok(result));
  }

  /**
   * 根据用户名获取用户
   */
  @httpGet("/getUser")
  public async getUser(req: Request, res: Response) {
    let { userName } = req.query;
    let result = await this.server.getUserByUserName(userName as string);
    res.send(Result.ok(result));
  }

  /**
   * 查询用户数量
   */
  @httpGet("/getUserCount")
  public async getUserCount(req: Request, res: Response) {
    let result = await this.server.getUserCount();
    res.send(Result.ok(result));
  }
}

Message模块业务实现

dto层

src/message/message.dto.ts

export class MessageDto {
  id?: number;
  text: string;
  userId: number;
  userName: string;
  createTime?: Date;
}

server层

src/message/service.ts

import { injectable, inject } from "inversify";
import { PrismaDB } from "../../db";
import { MessageDto } from "./message.dto";

@injectable()
export class MessageService {
  // 自动注入prisma
  constructor(@inject(PrismaDB) private PrismaDB: PrismaDB) {}

  /**
   * 添加消息
   */
  public async send(message: MessageDto) {
    return await this.PrismaDB.prisma.message.create({
      data: {
        text: message.text,
        userId: message.userId,
        userName: message.userName,
      },
    });
  }

  /**
   * 获取消息列表
   */
  public async list() {
    return await this.PrismaDB.prisma.message.findMany();
  }
}

controller层

src/message/controller.ts

import { inject } from "inversify";
import { controller, httpGet, httpPost } from "inversify-express-utils";
import { Request, Response } from "express";
import Result from "../../utils/Result";
import { MessageService } from "./service";
import { MessageDto } from "./message.dto";

@controller("/message")
export class MessageController {
  constructor(@inject(MessageService) private server: MessageService) {}

  @httpPost("/send")
  async send(req: Request, res: Response) {
    const message = req.body as MessageDto;
    const result = await this.server.send(message);
    res.json(Result.ok(result));
  }

  @httpGet("/list")
  async list(req: Request, res: Response) {
    const result = await this.server.list();
    res.json(Result.ok(result));
  }
}

socket消息处理

src/message/sockit.ts

import { Server } from "socket.io";
import axios from "axios";
import { createServer } from "http";

// 基础URL
axios.defaults.baseURL = "http://localhost:3000";
// 响应拦截器
axios.interceptors.response.use((res) => {
  return res.data;
});

// 创建一个通信服务器
const httpServer = createServer();
const io = new Server(httpServer, {
  cors: {
    origin: "*", // 允许跨域的前端域名
    methods: ["GET", "POST"], // 允许的跨域请求方法
    credentials: true, // 允许cookies等认证信息一起跨域传递
  },
});

// 维护一个map，key表示房间号，value表示用户列表，value是一个数组，里面存有socketId,用户ID
const groupList = {};

// 监听连接
io.on("connection", (socket) => {
  // 监听连接事件
  socket.on("join", async ({ roomId, id, userName }) => {
    console.log(userName, "连接到房间");
    // 连接到指定的房间号
    socket.join(roomId);
    // 维护map信息
    if (groupList[roomId]) {
      groupList[roomId].push({
        id, // 用户ID
        userName, // 用户名
        roomId, // 房间号
        socketId: socket.id, // socketId
      });
    } else {
      groupList[roomId] = [{ id, userName, roomId, socketId: socket.id }];
    }
    // 获取群聊总用户
    let countRes = await axios.get(`/user/getUserCount`);
    // 向房间内的所有用户广播消息，更新用户数量
    io.to(roomId).emit("userCount", {
      all: countRes.data,
      online: io.engine.clientsCount, // 获取当前房间的有效连接数
    });
  });

  // 监听发送消息事件
  socket.on("send", async (data) => {
    console.log(data, "接收到消息");

    // 发送消息
    let res = await axios.post(`/message/send`, data);
    // 更新消息
    io.to(data.roomId).emit("message", res.data);
  });

  // 监听用户离开事件
  socket.on("disconnect", async () => {
    // 遍历房间信息，找到是谁离开了，然后更新这个房间的在线人数
    for (let key in groupList) {
      let list = groupList[key];
      // 根据socketId找到用户
      let index = list.findIndex((item) => item.socketId === socket.id);
      if (index !== -1) {
        let userInfo = list[index];
        let countRes = await axios.get(`/user/getUserCount`);
        // 向房间内的所有用户广播消息，更新用户数量
        io.to(userInfo.roomId).emit("userCount", {
          all: countRes.data,
          online: io.engine.clientsCount,
        });
        // 删除用户
        list.splice(index, 1);
        break;
      }
    }
  });
});

httpServer.listen(3001, () => {
  console.log("sockit服务器已启动 ws://localhost:3001");
});

业务代码整合

index.ts

import "reflect-metadata"; // 装饰器的基础，放在顶层
import "./src/message/sockit";
import { InversifyExpressServer } from "inversify-express-utils";
import { Container } from "inversify";
import express from "express";
import { PrismaClient } from "@prisma/client";
import { PrismaDB } from "./db";
import { UserController } from "./src/user/controller";
import { UserService } from "./src/user/service";
import { MessageController } from "./src/message/controller";
import { MessageService } from "./src/message/service";

const container = new Container();
// 注入工厂注入PrismaClient
container.bind<PrismaClient>("PrismaClient").toFactory(() => {
  return () => new PrismaClient();
});
// 注入数据库ORM框架PrismaClient
container.bind(PrismaDB).to(PrismaDB);
// 用户模块
container.bind(UserController).to(UserController);
container.bind(UserService).to(UserService);
// 消息模块
container.bind(MessageController).to(MessageController);
container.bind(MessageService).to(MessageService);

const server = new InversifyExpressServer(container);

server.setConfig((app) => {
  // 配置中间件,允许post参数
  app.use(express.json());
  // 允许跨域
  app.use(function (req, res, next) {
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.setHeader("Access-Control-Allow-Headers", "*");
    res.setHeader("Access-Control-Allow-Methods", "*");
    next();
  });
});

const app = server.build();

app.listen(3000, () => {
  console.log("Server is running on port http://localhost:3000");
});

运行 npm run start

前端代码实现

初始化项目

npm create vue@latest

安装依赖

"dependencies": {
    "axios": "^1.7.7",
    "sass": "^1.79.3",
    "socket.io-client": "^4.8.0"  
},

加入群聊

src/views/join.vue

<template>
  <div class="content">
    <div class="logo">
      <img src="../assets/logo.webp" />
    </div>
    <div class="main">
      <div>请输入您的用户名</div>
      <input
        id="userName"
        type="text"
        placeholder="请输入内容"
        autocomplete="off"
        v-model="userName"
      />
    </div>
    <div class="btn">
      <button @click="join">加入群聊</button>
    </div>
  </div>
</template>

<script setup>
import { ref } from "vue";
import { useRouter } from "vue-router";
import http from "../../utils/http";

const router = useRouter();
const userName = ref("");

async function join() {
  if (!userName.value) {
    alert("请输入用户名");
    return;
  }
  let userInfo = {};
  let res = await http.get(`/user/getUser?userName=${userName.value}`);
  if (res.data) {
    userInfo = res.data;
  } else {
    let res = await http.post(`/user/add`, {
      userName: userName.value,
    });
    userInfo = res.data;
  }

  // 进入聊天页面
  router.push({ path: "/chat", query: userInfo });
}
</script>

<style scoped lang="scss">
.content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  .logo {
    width: 100px;
    height: 100px;
    margin-top: 30%;
    img {
      width: 100%;
      height: 100%;
    }
  }

  .main {
    width: 80%;
    margin-top: 20%;
    input {
      padding: 10px;
      box-sizing: border-box;
      border: 1px solid #a18cd1;
      border-radius: 5px;
      width: 100%;
      margin-top: 10px;
    }
  }

  .btn {
    width: 80%;
    button {
      padding: 10px;
      border: none;
      border-radius: 5px;
      color: #ffffff;
      margin-top: 30px;
      width: 100%;
      background-image: linear-gradient(-90deg, #a18cd1 0%, #fbc2eb 100%);
    }
  }
}
</style>

点击加入群聊后会先去查询当前用户名是否在表中存在，如果不存在，则会新建一个用户保存到表中，并返回用户信息，如果存在，则直接返回用户信息跳转到聊天界面

群聊实现

src/views/chat.vue

<template>
  <div class="content">
    <div class="header">
      <div>聊天室({{ state.count.all }})</div>
      <div class="online">当前在线人数：{{ state.count.online }}</div>
    </div>
    <div class="main">
      <div v-for="item in state.msgList" :key="item.id">
        <div class="item mymsg" v-if="item.userId === state.userInfo.id">
          <div>{{ item.userName }}</div>
          <div class="msg">{{ item.text }}</div>
        </div>
        <div class="item" v-else>
          <div>{{ item.userName }}</div>
          <div class="msg">{{ item.text }}</div>
        </div>
      </div>
    </div>
    <div class="footer">
      <input
        v-on:keyup.enter="sendMsg"
        type="text"
        placeholder="请输入内容"
        v-model="state.msg"
      />
      <button @click="sendMsg">发送</button>
    </div>
  </div>
</template>

<script setup>
import { nextTick, onMounted, reactive, onUnmounted } from "vue";
import { useRoute } from "vue-router";
import io from "socket.io-client";
import http from "../../utils/http";

// 连接到后端
const socket = io("ws://localhost:3001", {
  transports: ["websocket", "polling"],
  withCredentials: true,
});

const route = useRoute();
const state = reactive({
  msg: "",
  msgList: [],
  count: {
    all: 0,
    online: 0,
  },
  userInfo: {
    id: parseInt(route.query.id),
    userName: route.query.userName,
    roomId: 1, // 房间号暂时固定为1
  },
});

function sendMsg() {
  let sendData = {
    roomId: state.userInfo.roomId,
    userId: state.userInfo.id,
    userName: state.userInfo.userName,
    text: state.msg,
  };

  state.msg = "";

  // 发送消息
  socket.emit("send", sendData);
}

// 获取历史消息
async function getHistoryMsg() {
  const res = await http.get("/message/list");
  state.msgList = res.data;
}

onMounted(() => {
  // 监听连接
  socket.on("connect", async () => {
    // 获取历史消息
    await getHistoryMsg();
    // main 滑动到底部
    nextTick(() => {
      const main = document.querySelector(".main");
      main.scrollTop = main.scrollHeight;
    });
    // 连接到房间
    socket.emit("join", state.userInfo);
    // 更新数量
    socket.on("userCount", (count) => {
      state.count = count;
    });
    // 监听消息
    socket.on("message", (data) => {
      // 将消息添加到列表
      state.msgList.push(data);
      // main 滑动到底部
      nextTick(() => {
        const main = document.querySelector(".main");
        main.scrollTop = main.scrollHeight;
      });
    });
  });
});

// 组件销毁时关闭连接
onUnmounted(() => {
  socket.close();
});
</script>

<style scoped lang="scss">
.content {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  height: 100%;
}
.header {
  height: 45px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  .online {
    font-size: 12px;
    color: #999;
    position: relative;
  }
  .online::before {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: #09d638;
    border-radius: 50%;
    left: -15px;
    top: 5px;
  }
}

.main {
  height: calc(100% - 95px);
  background-color: #f6f6f6;
  padding: 2%;
  overflow: auto;
  .item {
    margin-bottom: 10px;
    .msg {
      max-width: 80%;
      padding: 10px;
      border-radius: 5px;
      display: inline-block;
      text-align: left;
      margin-top: 2px;
      background-color: #ffffff;
    }
  }
  .mymsg {
    text-align: right;
    .msg{
      background-color: #e6e1f5;
    }
  }
}

.footer {
  height: 50px;
  background-color: #ffffff;
  padding: 5px;
  display: flex;
  box-sizing: border-box;
  align-items: center;

  input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  button {
    width: 18%;
    padding: 10px;
    border: none;
    border-radius: 50px;
    background-image: linear-gradient(-90deg, #a18cd1 0%, #fbc2eb 100%);
    color: #ffffff;
    margin-left: 2%;
    height: 35px;
  }
}
</style>

使用lottie实现入场动画

我们就简单的根据用户名中是否以vip开头，如果是VIP开头的用户加入群聊后，就播放一个入场动画，主要目的是为了学习 lottie 动画

lottie官网： https://airbnb.io/lottie/#/web

免费动画库：https://lottiefiles.com/free-animation

安装

npm install lottie-web

在chat.vue代码中添加下面的代码

<!-- 动画播放器 -->
<div class="lottie-view" v-if="isPlaying">
    <div id="lottie"></div>
    <div>欢迎 {{ currJoinUser }} 加入群聊</div>
</div>

添加样式

.lottie-view {
  position: absolute;
  top: 10%;
  left: 0;
  text-align: center;
}

编写动画逻辑

import lottie from "lottie-web";
import vipJoin from "../assets/vipjoin.json";

// 动画逻辑
const animation = ref(null);
const isPlaying = ref(false);
const currJoinUser = ref(null);

const toggleAnimation = () => {
  if (isPlaying.value) return;
  isPlaying.value = true;
  nextTick(() => {
    animation.value = lottie.loadAnimation({
      container: document.getElementById("lottie"),
      renderer: "canvas",
      loop: false,
      autoplay: true,
      animationData: vipJoin,
    });
    animation.value.addEventListener("complete", () => {
      isPlaying.value = false;
    });
  });
};

案例中对应的json地址：https://lottiefiles.com/free-animation/success-celebration-Sn1bJRj6pz

然后在 userCount 监听方法中，判断最新加入的用户名是否是vip开头的，如果是就播放动画

// 更新数量
socket.on("userCount", (data) => {
    state.count.all = data.all;
    state.count.online = data.online;
    currJoinUser.value = data.userName;
    // 判断用户名称是否包含vip
    if (data.userName && data.userName.startsWith("vip")) {
        toggleAnimation();
    }
});

同时后端代码中的 src/message/sockit.ts 文件，下面的代码需要修改一下，多传递一个用户名称

// 向房间内的所有用户广播消息，更新用户数量
io.to(roomId).emit("userCount", {
    all: countRes.data,
    online: io.engine.clientsCount,
    userName // 广播最新加入的用户
});

效果展示

完整代码

https://gitee.com/szxio/bilibili-xiaoman---node-js/tree/master/%E8%81%8A%E5%A4%A9%E5%AE%A4demo/test