Node.js dgram.createSocket()用法及代码示例

dgram.createSocket()方法是dgram模块中的内置应用程序编程接口，用于创建dgram.socket对象。

用法:

const dgram.createSocket(options[, callback])

参数：此方法采用以下参数：

options:它将使用以下选项之一-
- type:插座系列。
- reuseAddr:布尔值(如果地址已被重用)。
- ipv6Only：将ipv6Only设置为true将禁用dual-stack支持。
- recvBufferSize:设置SO_RCVBUF套接字值。
- sendBufferSize:设置SO_SNDBUF套接字值。
- lookup:自定义查找函数。
callback:回调函数，用于进一步操作。

返回值：此方法返回dgram.socket的对象。

范例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");

输出：

12345
UDP String:Hello

范例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");

输出：

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

使用以下命令运行index.js文件：

node index.js

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

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js dgram.createSocket() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。