centos7 node express项目 将http接口升级为https接口的解决方法

1、将对应的ssl证书放到项目文件中（我装的镜像是oneinstack的，创建项目时可以直接选择生成ssl证书的项目，即 xxx.key 和 xxx.crt 文件）；

2、修改bin/www文件，修改代码如下：

#!/usr/bin/env node

/**
 * Module dependencies.
 */

var app = require('../app');
var debug = require('debug')('https:server');
//关键包
var path = require('path'); 
var https = require('https');
var fs = require('fs');

//ssl证书相关文件
var privateKey  = fs.readFileSync(path.join(__dirname, './https.key'), 'utf8');
var certificate = fs.readFileSync(path.join(__dirname, './https.crt'), 'utf8');
var credentials = {key: privateKey, cert: certificate};


/**
 * Get port from environment and store in Express.
 */

var port = normalizePort(process.env.PORT || '8081'); //端口号
app.set('port', port);

/**
 * Create HTTP server.
 */

var server = https.createServer(credentials, app); //新的https服务

/**
 * Listen on provided port, on all network interfaces.
 */

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}

3、项目重启，输入https://localhost:8081，能看到网页如下显示，则代表https服务成功。

注：虽然已经是https服务了，但还是会报不安全提示，是因为我们的证书问题。不影响正常功能。