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NodeJS+Koa学习笔记(1-8)Node.js WebSocket请求接口开发

  • 2026-05-29 18:06:36
NodeJS+Koa学习笔记(1-8)Node.js WebSocket请求接口开发

Node.js WebSocket请求接口开发

本次记录WebSocket接口是如何通过Node.js,如何发送与接收WebSocket的请求,由于前面已经准备好了Node.js的http模块的技术储备,所以在http模块的基础上准备WebSocket的网络请求,为后续的项目中会使用到的双向通信请求进行前期技术储备

WebSocket学习目标

  • • 1、Node.js如何接收前端WebSocket请求并响应
  • • 2、Node.js如何发送WebSocket请求连接第三方并响应
  • • 3、WebSocket实现方式

NodeJS服务制作WebSocket请求接收

介绍

WebSocket用于浏览器和服务端之间的双向通信,连接建立后,前端和Node.js服务端都可以主动发送消息

Node.js官方没有单独的WebSocket服务端模块,所以这里使用官方http模块接收升级请求,再使用官方crypto模块生成握手响应,只保留最基础的短文本消息接收与响应功能

WebSocket实现方式

ws发起->http->tcp->buffer->解析buffer中的stream流

示例

const http = require("http");const crypto = require("crypto");const GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";let time = null;function send(socket, text) {const data = Buffer.from(text);  socket.write(Buffer.concat([Buffer.from([0x81, data.length]), data]));}function read(buffer) {const length = buffer[1] & 0x7f;const mask = buffer.slice(26);const data = buffer.slice(66 + length);for (let i = 0; i < data.length; i++) {    data[i] = data[i] ^ mask[i % 4];  }return data.toString();}const server = http.createServer((req, res) => {  res.end("WebSocket服务端-运行中...");});server.on("upgrade"(req, socket) => {const key = req.headers["sec-websocket-key"];const accept = crypto    .createHash("sha1")    .update(key + GUID)    .digest("base64");  socket.write(    ["HTTP/1.1 101 Switching Protocols","Upgrade: websocket","Connection: Upgrade",`Sec-WebSocket-Accept: ${accept}`,"","",    ].join("\r\n"),  );console.log("有客户端已接入");let count = 0;  time = setInterval(() => {    count++;send(socket, "服务端消息主动推送-" + count);if (count > 10) {clearInterval(time);      socket.end();    }  }, 1000);  socket.on("data"(buffer) => {if ((buffer[0] & 0x0f) === 0x8) {      socket.end();return;    }const message = read(buffer);console.log("收到客户端消息:(" + message + ")");send(socket, `回复客户端-服务端已收到-以下为收到的内容:${message}`);  });  socket.on("close"() => {console.log("客户端已主动断开连接");clearInterval(time);  });  socket.on("error"(err) => {clearInterval(time);console.error("WebSocket服务端连接异常:", err.message);  });});server.listen(3000() => {console.log("WebSocket 服务端已启动: ws://localhost:3000");});

NodeJS服务发送WebSocket请求

介绍

通过nodejs的服务调用另一个服务的WebSocket请求,这里先创建一个简单的HTTP服务,确保Node.js服务可以正常启动,然后在服务启动成功时,立即使用Node.js官方内置的WebSocket客户端连接指定的WebSocket接口地址

WebSocket实现方式

http->stream流->buffer缓冲区->tcp-发送成功

示例

const http = require("http");const wsURL = "ws://localhost:3000"// 替换为你要连接的WebSocket接口地址,当前地址为上方接收ws服务的地址function connectWebSocket() {const ws = new WebSocket(wsURL);  ws.onopen = () => {    ws.send("客户端主动推送: WebSocket连接成功");let time = null;let count = 0;    time = setInterval(() => {      count++;      ws.send("客户端主动推送: 发送测试消息:" + count);if (count > 10) {clearInterval(time);        ws.close();      }    }, 1000);  };  ws.onmessage = (event) => {console.log("收到服务端响应:", event.data);  };  ws.onerror = (err) => {console.error("WebSocket请求失败:", err.message);  };  ws.onclose = () => {console.log("WebSocket连接已关闭");  };}const server = http.createServer((req, res) => {  res.writeHead(200, {"Content-Type""text/plain; charset=utf-8",  });  res.end("Node.js WebSocket客户端服务运行中");});server.listen(3001() => {    console.log("HTTP 服务已启动: http://localhost:3001");    connectWebSocket();});server.on("error"(err) => {    console.error("HTTP服务启动失败: ", err.message);});

注意事项

  • • 1、WebSocket是长连接,连接成功后客户端和服务端都可以主动发送消息
  • • 2、WebSocket地址一般以ws://wss://开头,wss://表示加密连接,就像http://https://的区别
  • • 3、Node.js官方内置WebSocket主要用于作为客户端发起连接,服务端仍然需要通过httpupgrade事件处理连接升级
  • • 4、如果当前Node.js版本不支持内置WebSocket,建议升级Node.js版本,本文不使用ws等外部依赖
  • • 5、实际项目中需要根据业务增加鉴权、心跳、重连、异常关闭等逻辑,在后续项目的开发中会逐步补充封装
  • • 6、如果只是普通请求响应,不需要长连接,使用Ajax即可,要注意WebSocket的使用场景,不要滥用,就像轮询或定时器一样,不要滥用,必须要用则注意关闭或清理

本文代码测试步骤参考

1、初始化node项目服务

  • • 1、新建一个文件夹mkdir -p my-node
  • • 2、进入目录创建node项目npm init -y
  • • 3、修改package.json,参考下方代码
{"name":"my-node",    "version":"1.0.0",    "main":"main.js",    "scripts":{"dev":"node main.js"    },    "keywords":[],    "author":"",    "license":"ISC",    "description":""}
  • • 4、新建一个入口文件main.js 复制上方接收代码

2、启动测试node项目

  • • 1、执行npm run dev启动

3、调用测试

  • • 1、建议使用postmanapifox这类可以主动发起各类请求的测试工具
  • • 2、也可以将两个测试代码写入到一个项目内,分别为main.jsmain-server.js
  • • 3、使用命令先启动node main-server.js,在启动main.js,在终端查看输出效果

👉往期推荐:

NodeJS+Koa学习笔记(1-7)Node.js SSE请求接口开发

NodeJS+Koa学习笔记(1-6)Node.js Buffer 和 Stream的使用

NodeJS+Koa学习笔记(1-5)Node.js TCP / UDP / HTTP 网络编程基础

NodeJS+Koa学习笔记(1-3-1)Node.js http、path模块的使用

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  1. CONNECT:[ UseTime:0.000519s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000749s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000258s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000318s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000649s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000650s ]
  8. SELECT * FROM `article` WHERE `id` = 491592 LIMIT 1 [ RunTime:0.000487s ]
  9. UPDATE `article` SET `lasttime` = 1780075768 WHERE `id` = 491592 [ RunTime:0.000698s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000269s ]
  11. SELECT * FROM `article` WHERE `id` < 491592 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000401s ]
  12. SELECT * FROM `article` WHERE `id` > 491592 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000390s ]
  13. SELECT * FROM `article` WHERE `id` < 491592 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001015s ]
  14. SELECT * FROM `article` WHERE `id` < 491592 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001270s ]
  15. SELECT * FROM `article` WHERE `id` < 491592 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000835s ]
0.079322s