CakePHP(1.3)でJSON出力する単純な例

gistfile1.php

<?php // {app}/config/routes.php
/**
 * Routes Configuration
 *
 * In this file, you set up routes to your controllers and their actions.
 * Routes are very important mechanism that allows you to freely connect
 * different urls to chosen controllers and their actions (functions).
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.app.config
 * @since         CakePHP(tm) v 0.2.9
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */

/**
 * Here, we are connecting '/' (base path) to controller called 'Pages',
 * its action called 'display', and we pass a param to select the view file
 * to use (in this case, /app/views/pages/home.ctp)...
 */
	Router::connect('/', array('controller' => 'pages', 'action' => 'display', 'home'));

/**
 * ...and connect the rest of 'Pages' controller's urls.
 */
	Router::connect('/pages/*', array('controller' => 'pages', 'action' => 'display'));
  
  // 1. 拡張子でリソースの種類を判断できるよう、Router::parseExtensions()を追加します。
  Router::parseExtensions();

gistfile2.php

<?php // {app}/views/layouts/json/default.ctp
// 2. JSON用のデフォルトレイアウトビューファイルを追加します。
?>
<?php echo $content_for_layout; ?>

gistfile3.php

<?php // {app}/views/users/json/index.ctp
// 3. データをJSON出力するためのビューファイルを作成します。
?>
<?php echo json_encode($users) ?>

gistfile4.php

<?php // {app}/controllers/users_controller.php
class UsersController extends AppController {
  var $name = 'Users';
  var $helpers = array('Html', 'Form');

  // 4. RequestHandlerを追加します。
  var $components = array('RequestHandler');
  
  function beforeFilter() {
    // 5. debug設定が0でないとContent-Typeがtext/htmlになるようなので、
    //    debug設定を0にしてJSONのときのContent-Typeがapplication/jsonになるようにします。
    //    (4.と5.はapp_controller.phpに設定してしまってもよいかもしれません)
    if ($this->RequestHandler->ext == 'json') {
      Configure::write('debug', 0);
    }
  }

  function index() {
    // 6. JSON出力するデータをセットします。
    $this->User->recursive = 0;
    $this->set('users', $this->paginate());
  }
}
?>