node.js 用socket實現聊天

雜湊發表於2019-02-16
Node.js

node.js 用socket實現聊天

伺服器搭建

app.js

const http = require("http");
const express = require("./express");

//建立一個服務
const server = http.createServer(express);

//監聽服務埠
server.listen(8001,()=>{
    console.log("服務端已經啟動,請訪問 http://localhost:8001");
});

express.js

const url=require("url");
const fs=require("fs");

function express(req,res){
    var urlObj=url.parse(req.url);
    //console.log(urlObj);

    var filePath="./www"+urlObj.pathname;
    var content="not found";
    if(fs.existsSync(filePath)){
        content=fs.readFileSync(filePath);
    }
    
    res.end(content.toString());
}


module.exports=express;

index.html

<!DOCTYPE html>
<html lang="en">
    <head>
      <meta charset="utf-8"/>
        <title>Socket.IO chat</title>
        <style>
          * { margin: 0; padding: 0; box-sizing: border-box; }
          body { font: 13px Helvetica, Arial; }
          form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
          form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
          form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
          #messages { list-style-type: none; margin: 0; padding: 0; }
          #messages li { padding: 5px 10px; }
          #messages li:nth-child(odd) { background: #eee; }
        </style>
      </head>
      <body>
        <ul id="messages"></ul>
        <form action="">
          <input id="m" autocomplete="off" /><button>Send</button>
        </form>

        <script src="js/lib/jquery-1.11.1.js"></script>
        <script src="js/lib/socket.io.js"></script> 
        <script src="js/index.js"></script>
      </body>
</html>

客戶端服務搭建與服務端通訊

我們要建立服務端socket請求連線

io.on(`connection`, function(socket){
    console.log(`a user connected`);

    //斷開連線
    socket.on(`disconnect`, function(){
        console.log(`user disconnected`);
    });
});

index.js

//客戶端建立連線 
var socket = io();

客戶端向服務端傳送請求

index.js

$(`form`).submit(function(){
    //觸發事件
    socket.emit(`chat message`, $(`#m`).val());
    $(`#m`).val(``);
    return false;
  });

app.js

//接收客戶端的資訊
socket.on(`chat message`, function(msg){
    console.log(`message: ` + msg);
});

將服務端的資料廣播到客戶端去

socket.on(`chat message`, function(msg){
        console.log(`message: ` + msg);

        socket.broadcast.emit("clientE",msg);
    });

客戶端接收服務端廣播出來的資料

socket.on(`clientE`, function(msg){
    $(`#messages`).append($(`<li>`).text(msg));
});

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