Node.js dgram.createSocket() 方法

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。

句法：

const dgram.createSocket(options[, callback])

参数：此方法采用以下参数：

• 选项：它将使用以下选项之一 -
  • type： socket家族。
  • 重用地址：如果地址已被重用，则为布尔值。
  • ipv6Only：将 ipv6Only 设置为 true 将禁用双栈支持。
  • recvBufferSize：设置 SO_RCVBUF 套接字值。
  • sendBufferSize：设置 SO_SNDBUF 套接字值。
  • 查找：自定义查找函数。
• callback：进一步操作的回调函数。

返回值：该方法返回dgram.socket的对象。

示例 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 client
// 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 receive 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

示例 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 client
// 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();
 
});
 
// Catching 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