Node.js dgram.createSocket()用法及代碼示例

dgram.createSocket()方法是dgram模塊中的內置應用程序編程接口，用於創建dgram.socket對象。

用法:

const dgram.createSocket(options[, callback])

參數：此方法采用以下參數：

options:它將使用以下選項之一-
- type:插座係列。
- reuseAddr:布爾值(如果地址已被重用)。
- ipv6Only：將ipv6Only設置為true將禁用dual-stack支持。
- recvBufferSize:設置SO_RCVBUF套接字值。
- sendBufferSize:設置SO_SNDBUF套接字值。
- lookup:自定義查找函數。
callback:回調函數，用於進一步操作。

返回值：此方法返回dgram.socket的對象。

範例1： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// dgram.createSocket() method 
  
// importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing clinet  
// and server socket by using  
// createSocket() method 
var client = dgram.createSocket("udp4"); 
var server = dgram.createSocket("udp4"); 
  
// Catching the message event 
server.on("message", function (msg) { 
  
    // Displaying the client message 
    process.stdout.write("UDP String:" + msg + "\n"); 
  
    // Exiting process 
    process.exit(); 
}) 
    // Binding server with port 
    .bind(1234, () => { 
  
        // Setting the Send buffer size 
        // by using setSendBufferSize() method 
        server.setSendBufferSize(12345); 
  
        // Getting the recive buffer size 
        // by using getSendBufferSize() method 
        const size = server.getSendBufferSize(); 
  
        // Display the result 
        console.log(size); 
  
    }); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

輸出：

12345
UDP String:Hello

範例2： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// dgram.createSocket() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing clinet 
// and server socket by using  
// createSocket() method 
var client = dgram.createSocket("udp4", () => { 
    console.log("client is created"); 
}); 
var server = dgram.createSocket("udp4", () => { 
    console.log("server is created"); 
}); 
  
// Catching the message event 
server.on("message", function (msg) { 
  
    // Displaying the client message 
    process.stdout.write("UDP String:" + msg + "\n"); 
  
    // Exiting process 
    process.exit(); 
  
}); 
  
// Cathing the listening event 
server.on('listening', () => { 
  
    // Getting address information  
    // for the server 
    const address = server.address(); 
  
    // Display the result 
    console.log(`server listening  
    ${address.address}:${address.port}`); 
  
}); 
  
// Binding server with port address 
// by using bind() method 
server.bind(1234, () => { 
  
    // Setting the Send buffer size 
    // by using setSendBufferSize() method 
    server.setSendBufferSize(1234567); 
  
    // Getting the Send buffer size 
    // by using getSendBufferSize() method 
    const size = server.getSendBufferSize(); 
  
    // Display the result 
    console.log(size); 
}); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

輸出：

server listening 0.0.0.0:1234
1234567
server is created
UDP String:Hello

使用以下命令運行index.js文件：

node index.js

參考： https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_dgram_createsocket_options_callback

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js dgram.createSocket() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。