recess----2.Controller里面取用request信息

事实上，第一个APP里面除了没有model，其它的都有用过了，但是需要单独拎出来看看清楚。

Recess框架里面的controller就是一个典型的MVC框架的controller，它负责处理从浏览器（或其它客户端）过来的request，然后调用引用model里面的方法来进行运算，最后选择合适的view来产生response，然后把response发回给客户端。这里没有什么好纠结的，深入的得去看代码了。

这里的过程，我们继续在Hello Recess这一个APP的基础上来进行。

不妨再回来看看第一个例子里面的controller：

<?php
Library::import('recess.framework.controllers.Controller');
/**
 * !RespondsWith Layouts
 * !Prefix Views: home/, Routes: /
 */
class HelloRecessHomeController extends Controller {
    
    /** !Route GET */
    function index() {
        $this->flash = 'Hello Recess!';
    } 
}
?>

前面有大概介绍，这里的注释“！Route GET”是做routing来用的。什么实现啊，效率啊，咱暂时不关心，那是后面的话题，咱还是继续讨论controller。controller都处理些什么呢？OK，上面的例子处理的就是浏览器发来的GET请求。我们知道，HTTP的标准请求包括了request METHOD，variables, headers, cookies, URL等等这些。而注释里的“！Route”就是告诉routing，我们用controller里面的这个method（这里指contorller这个类里面的一个函数，也就是方法）来处理相应的“GET/POST/PUT/DELETE”这些HTTP METHOD（这里指HTTP协议里面定义的请求方式）。然后，我们可以通过一系列借口来取出request携带的信息并进行处理。

以GET请求为例，我们看看怎样取出信息。我们需要再给这个controller添加一个method：

    /** !Route GET, printIt */
    function printIt() {  
        print $this->request->resource . '<br />';  
        print_r($this->request);   
        exit;  
    }

这里，我们不需要使用view，所以直接exit。我们直接在浏览器查看的话，它会直接打印出request这个object的所有内容。

访问http://localhost/helloRecess/printIt，看到以下信息（直接打印在屏幕上的有些乱，这里是查看源代码后的结构）：

/helloRecess/printIt

Request Object
(
    [accepts] => Accepts Object
        (
            [headers:protected] => Array
                (
                    [ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
                    [ACCEPT_ENCODING] => gzip,deflate,sdch
                    [ACCEPT_LANGUAGE] => zh-CN,zh;q=0.8,en;q=0.6
                    [CACHE_CONTROL] => max-age=0
                    [CONNECTION] => keep-alive
                    [COOKIE] => CNZZDATA5619041=cnzz_eid%3D1321855538-1388926353-%26ntime%3D1388926353%26cnzz_a%3D0%26ltime%3D1388926352365; session=GYjQdK9TIghhNg5jeOX40Wj5fswl1qoGNYg0spSAT9qqptZRI4TIZALE2Gz46lKT
                    [HOST] => www.noarduino.com
                    [USER_AGENT] => Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.76 Safari/537.36
                )

            [format:protected] => 
            [formats:protected] => 
            [formatsTried:protected] => Array
                (
                )

            [formatsCurrent:protected] => Array
                (
                )

            [languages:protected] => 
            [encodings:protected] => 
            [charsets:protected] => 
        )

    [format] => html
    [headers] => Array
        (
            [ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
            [ACCEPT_ENCODING] => gzip,deflate,sdch
            [ACCEPT_LANGUAGE] => zh-CN,zh;q=0.8,en;q=0.6
            [CACHE_CONTROL] => max-age=0
            [CONNECTION] => keep-alive
            [COOKIE] => CNZZDATA5619041=cnzz_eid%3D1321855538-1388926353-%26ntime%3D1388926353%26cnzz_a%3D0%26ltime%3D1388926352365; session=GYjQdK9TIghhNg5jeOX40Wj5fswl1qoGNYg0spSAT9qqptZRI4TIZALE2Gz46lKT
            [HOST] => www.noarduino.com
            [USER_AGENT] => Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.76 Safari/537.36
        )

    [resource] => /helloRecess/printIt
    [resourceParts] => Array
        (
            [0] => helloRecess
            [1] => printIt
        )

    [method] => GET
    [input] => 
    [isAjax] => 
    [get] => Array
        (
        )

    [post] => Array
        (
        )

    [put] => Array
        (
        )

    [cookies] => Array
        (
            [CNZZDATA5619041] => cnzz_eid=1321855538-1388926353-&ntime=1388926353&cnzz_a=0&ltime=1388926352365
            [session] => GYjQdK9TIghhNg5jeOX40Wj5fswl1qoGNYg0spSAT9qqptZRI4TIZALE2Gz46lKT
        )

    [meta] => Meta Object
        (
            [app] => HelloRecessApplication Object
                (
                    [name] => Hello Recess
                    [controllersPrefix] => helloRecess.controllers.
                    [modelsPrefix] => helloRecess.models.
                    [viewsDir] => /home/qkdemoco/domains/noarduino.com/public_html/apps/helloRecess/views/
                    [assetUrl] => /apps/helloRecess/public/
                    [routingPrefix] => helloRecess/
                    [plugins] => Array
                        (
                        )

                    [viewPathFinder:protected] => PathFinder Object
                        (
                            [paths:protected] => Array
                                (
                                    [0] => /home/qkdemoco/domains/noarduino.com/public_html/recess/recess/framework/ui/parts/
                                    [1] => /home/qkdemoco/domains/noarduino.com/public_html/apps/helloRecess/views/
                                )

                        )

                )

            [controllerMethod] => printIt
            [controllerMethodArguments] => Array
                (
                )

            [useAssociativeArguments] => 1
            [controller] => HelloRecessHomeController Object
                (
                    [request:protected] => Request Object
 *RECURSION*
                    [headers:protected] => 
                    [application:protected] => HelloRecessApplication Object
                        (
                            [name] => Hello Recess
                            [controllersPrefix] => helloRecess.controllers.
                            [modelsPrefix] => helloRecess.models.
                            [viewsDir] => /home/qkdemoco/domains/noarduino.com/public_html/apps/helloRecess/views/
                            [assetUrl] => /apps/helloRecess/public/
                            [routingPrefix] => helloRecess/
                            [plugins] => Array
                                (
                                )

                            [viewPathFinder:protected] => PathFinder Object
                                (
                                    [paths:protected] => Array
                                        (
                                            [0] => /home/qkdemoco/domains/noarduino.com/public_html/recess/recess/framework/ui/parts/
                                            [1] => /home/qkdemoco/domains/noarduino.com/public_html/apps/helloRecess/views/
                                        )

                                )

                        )

                )

        )

    [username] => 
    [password] => 
)

在这里，一个Request携带了哪些信息一目了然，至于调用的方法：

1）字符串。比如上面的resource项，直接使用$this->request->resource即可。

2）array。比如上面的headers项中Host项，使用$this->request->headers[HOST]即可。get、post、put三个array的取用方法也一样，对应Key=value；可以尝试访问http://localhost/helloRecess/printIt?foo=bar，看看上面的request->get这个array里面有什么变化。