Go Web开发之Revel - 概述

一个Controller是任意嵌入rev.Controller的类型 (直接或间接嵌入)

典型的:

type AppController struct {

  *rev.Controller

}

目前,rev.Controller必须作为struct中的第一个元素

rev.Controller是请求的上下文.它包括请求和相应数据.详情请见the godoc,下面是Controller的定义

type Controller struct {

    Name          string          // The controller name, e.g. "Application"

    Type          *ControllerType // A description of the controller type.

    MethodType    *MethodType     // A description of the invoked action type.

    AppController interface{}     // The controller that was instantiated.



    Request  *Request

    Response *Response

    Result   Result



    Flash      Flash                  // User cookie, cleared after 1 request.

    Session    Session                // Session, stored in cookie, signed.

    Params     *Params                // Parameters from URL and form (including multipart).

    Args       map[string]interface{} // Per-request scratch space.

    RenderArgs map[string]interface{} // Args passed to the template.

    Validation *Validation            // Data validation helpers

    Txn        *sql.Tx                // Nil by default, but may be used by the app / plugins

}



// These provide a unified view of the request params.

// Includes:

// - URL query string

// - Form values

// - File uploads

type Params struct {

    url.Values

    Files map[string][]*multipart.FileHeader

}



type Request struct {

    *http.Request

    ContentType string

}



type Response struct {

    Status      int

    ContentType string

    Headers     http.Header

    Cookies     []*http.Cookie



    Out http.ResponseWriter

}

作为处理http请求的一部分,Revel实例化一个你的Controller的实例并在rev.Controller上面设置全部以上的属性,因此,Revel不在请求中共享Controller实例.