Node.js socket.remoteAddress()用法及代码示例

socket.remoteAddress()方法是dgram模块中Socket类的内置应用程序编程接口，用于获取服务器的远程地址，其中包括端口，地址和家族。

用法:

const socket.remoteAddress()

参数：此方法不接受任何参数。

返回值：此方法返回服务器的远程地址，其中包含端口，地址和家族。

范例1： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// server.remoteAddress() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing clinet 
// and server socket 
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(); 
  
}); 
  
// 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, () => { 
  
    // Connecting server with the port 
    // and local host 
    server.connect(1234, "localhost", () => { 
        console.log("connected"); 
  
        // Getting remote address of server 
        // by using remoteAddress() method 
        const add = server.remoteAddress(); 
  
        // Display the result 
        console.log(add); 
    }); 
}); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

输出：

server listening 0.0.0.0:1234
connected
{ address:'127.0.0.1', family:'IPv4', port:1234 }

示例2：如果未连接服务器。

文件名：index.js

Javascript

// Node.js program to demonstrate the 
// server.remoteAddress() method 
  
// Importing dgram module 
var dgram = require('dgram'); 
  
// Creating and initializing clinet 
// and server socket 
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(); 
}); 
  
// 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, () => { 
  
    // Getting remote address of server 
    // by using remoteAddress() method 
    // it will throw error 
    const add = server.remoteAddress(); 
  
    // Display the result 
    console.log(add); 
}); 
  
// Client sending message to server 
client.send("Hello", 0, 7, 1234, "localhost");

输出：

node GFG.js
server listening 0.0.0.0:1234
dgram.js:745
    throw new ERR_SOCKET_DGRAM_NOT_CONNECTED();
    ^

Error [ERR_SOCKET_DGRAM_NOT_CONNECTED]:Not connected
    at Socket.remoteAddress (dgram.js:745:11)
    at Socket.<anonymous> (F:\java\GFG.js:42:28)
    at Socket.onListening (dgram.js:225:10)
    at Socket.emit (events.js:327:22)
    at startListening (dgram.js:150:10)
    at dgram.js:345:7
    at processTicksAndRejections (internal/process/task_queues.js:85:21) {
  code:'ERR_SOCKET_DGRAM_NOT_CONNECTED'
}

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_socket_remoteaddress

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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 socket.remoteAddress() 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。