Node.js server.listen()用法及代碼示例

server.listen()是tls模塊內的Socket類的內置應用程序編程接口，用於啟動服務器以偵聽加密的連接。

用法:

const server.listen([port[, host[, backlog]]][, callback])

參數：此方法將以下參數作為參數：

port：是端口號。
主機：這是未指定的IPv4地址。

返回值：該方法除了回調函數外沒有其他要返回的內容。

如何生成私鑰和公共證書？

私鑰：打開記事本並複製粘貼以下 key ：

將文件另存為private-key.pem

公開證書：打開記事本並複製粘貼以下 key ：

將文件另存為public-cert.pem

範例1： 文件名：index.js

// Node.js program to demonstrate the 
// server.listen() method 
  
var tls = require('tls'), 
    fs = require('fs'), 
  
// Port and host address for server     
PORT = 1337, 
HOST = '127.0.0.1'; 
   
// Private key and public certificate for access 
var options = { 
  key:fs.readFileSync('private-key.pem'), 
  cert:fs.readFileSync('public-cert.pem'), 
  rejectUnauthorized:false
}; 
  
// Creating and initializing server 
var server = tls.createServer(options, function(socket) { 
  
  // Print the data that we received 
  socket.on('data', function(data) { 
     console.log('\nReceived:%s ', 
     data.toString().replace(/(\n)/gm, "")); 
  }); 
  
  // Stopping the server 
  // by using the close() method 
  server.close(); 
}); 
  
// Getting session key  
// by using getTicketKeys() method 
const value1 = server.getTicketKeys(); 
console.log(value1) 
  
// Close event 
server.on('close', () => { 
  console.log("Server closed successfully"); 
}) 
  
// Start listening on a specific port and address 
// by using listen() method 
server.listen(PORT, HOST, function() { 
  console.log("I'm listening at %s, on port %s", HOST, PORT); 
}); 
  
// Creating and initializing client 
var client = tls.connect(PORT, HOST, options, function() { 
    
  // Getting the bound address  
  // by using address method 
  const value = client.address(); 
  client.write("Bound address:" + value) 
  client.end(); 
});

輸出：

<Buffer 72 59 e4 89 85 0f ae fb eb e6 cb 3a 1a bf 92 19 2f ab 97 be 5d 10 19 50 cc 0f 98 d3 27 fe 9c 68 2a 31 f3 e8 17 b7 77 38 88 f0 28 64 90 1c 36 40>
I’m listening at 127.0.0.1, on port 1337

Received:Bound address:[object Object]
Server closed successfully

範例2： 文件名：index.js

// Node.js program to demonstrate the 
// server.listen() method 
  
var tls = require('tls'), 
    fs = require('fs'), 
  
// Port and host address for server     
PORT = 1337, 
HOST = '127.0.0.1', 
value = null; 
   
// Private key and public certificate for access 
var options = { 
  key:fs.readFileSync('private-key.pem'), 
  cert:fs.readFileSync('public-cert.pem'), 
  rejectUnauthorized:false
}; 
  
// Creating and initializing server 
var server = tls.createServer(options, function(socket) { 
  
  // Print the data that we received 
  socket.on('data', function(data) { 
    console.log('\nReceived:%s ', 
    data.toString()); 
  }); 
  
  // Stopping the server 
  // by using the close() method 
  server.close(); 
}); 
  
// Getting session key  
// by using getTicketKeys() method 
value = server.getTicketKeys(); 
  
// Start listening on a specific port and address 
// by using listen() method 
server.listen(PORT, HOST, function() { 
  console.log("I'm listening at %s, on port %s", HOST, PORT); 
}); 
  
// Creating and initializing client 
var client = tls.connect(PORT, HOST, options, function() { 
  client.write("Session key:" + value[0]) 
  client.end(); 
});

使用以下命令運行index.js文件：

node index.js

輸出：

I'm listening at 127.0.0.1, on port 1337

Received:Session key:106

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

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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 server.listen() 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。