如何自动加载一个文件后必须执行命令composer dump-autoload

{
  "name": "laravel/laravel",
  "description": "The Laravel Framework.",
  "keywords": [
    "framework",
    "laravel"
  ],
  "license": "MIT",
  "require": {
    "laravel/framework": "4.2.*",
    "pda/pheanstalk": "~2.0",
    "doctrine/dbal": "2.4.*",
    "guzzlehttp/guzzle": "5.3.1",
    "firebase/php-jwt": "4.0",
    "twilio/sdk": "5.7",
    "ircmaxell/random-lib": "1.2",
    "mjaschen/phpgeo": "1.3",
    "dompdf/dompdf": "0.8.2",
    "league/csv": "9.2"
  },
  "autoload": {#自动加载,方式分为files(files键对应的值是一个数组，数组元素是文件的路径，路径是相对于应用的根目录)和classmap(通过文件引入的方法虽然直观，但是很费劲，每个文件都得引入一次，实在不是好的解决办法,可以采用classmap，即兼容files，又可目录自动加载)
    "classmap": [
      "app/commands",
      "app/controllers",
      "app/models",
      "app/database/migrations",
      "app/database/seeds",
      "app/tests/TestCase.php",
      "app/libraries",
      "app/helpers",
      "app/logic",
      "app/jobs",
      "app/validators",
      "app/3rd",
      "app/classes",
      "app/filters"
    ]
  },
  "scripts": {
    "post-install-cmd": [
      "php artisan clear-compiled",
      "php artisan optimize"
    ],
    "post-update-cmd": [
      "php artisan clear-compiled",
      "php artisan optimize"
    ],
    "post-create-project-cmd": [
      "php artisan key:generate"
    ]
  },
  "config": {
    "preferred-install": "dist"
  },
  "minimum-stability": "stable",
  "require-dev": {
    "phpunit/phpunit": "4.8"
  },
  "repositories": {
    "packagist": {
      "type": "composer",
      "url": "https://packagist.laravel-china.org"
    }
  }
}

composer dump-autoload