Controller ¶

定义Controller接口和ActionContext

目录

Controller

要理解如何写一个controller，就需要先了解Controller和ActionContext这两个接口

Controller接口 ¶

type Controller interface {
    NewActionContext(req *http.Request, respWriter http.ResponseWriter) ActionContext   //每个Controller都可以实现自己的ActionText

    BeforeAction(context ActionContext)     //流程中的BeforeAction
    AfterAction(context ActionContext)      //流程中的AfterAction
    Destruct(context ActionContext)         //流程中的Destruct，此阶段用于释放每个请求中创建的临时资源，防止内存泄漏
}

ActionContext接口 ¶

type ActionContext interface {
    Request() *http.Request                //获得请求的http.Request对象
    ResponseWriter() http.ResponseWriter   //获得请求的http.ResponseWriter

    ResponseBody() []byte                  //获得响应Body，内容在Action处理中填充
}

一个示例 ¶

定义使用的ActionContext ¶

type DemoActionContext struct {
    Req        *http.Request
    RespWriter http.ResponseWriter
    RespBody   []byte
}

func (this *DemoActionContext) Request() *http.Request {
    return this.Req
}

func (this *DemoActionContext) ResponseWriter() http.ResponseWriter {
    return this.RespWriter
}

func (this *DemoActionContext) ResponseBody() []byte {
    return this.RespBody
}

定义Controller ¶

type IndexController struct {
}

func (this *IndexController) NewActionContext(req *http.Request, respWriter http.ResponseWriter) controller.ActionContext {
    return &DemoActionContext{
        Req:        req,
        RespWriter: respWriter,
    }
}

func (this *IndexController) BeforeAction(context controller.ActionContext) {
    acontext := context.(*DemoActionContext)

    acontext.RespBody = append(acontext.RespBody, []byte(" index before ")...)
}

例如将 "GET /index/index" 的请求在这个Action中处理
func (this *IndexController) IndexAction(context *DemoActionContext) {
    context.RespBody = append(context.RespBody, []byte(" index action ")...)
}

例如将 "GET /index/redirect" 的请求在这个Action中处理
func (this *IndexController) RedirectAction(context *DemoActionContext) {
    system.Redirect302("https://github.com/Andals/gobox")
}

func (this *IndexController) AfterAction(context controller.ActionContext) {
    acontext := context.(*DemoActionContext)

    acontext.RespBody = append(acontext.RespBody, []byte(" index after ")...)
}

func (this *IndexController) Destruct(context controller.ActionContext) {
    println(" index destruct ")
}