控制器

原文：https://beego.wiki/docs/quickstart/controller/

Controller 控制器

Controller logic 控制器逻辑

The previous section covered user requests to controllers. This section will explain how to write a controller. Let’s start with some code:

​ 上一节介绍了用户对控制器的请求。本节将说明如何编写控制器。我们从一些代码开始：

package controllers

import (
        "github.com/beego/beego/v2/server/web"
)

type MainController struct {
        web.Controller
}

func (this *MainController) Get() {
        this.Data["Website"] = "beego.wiki"
        this.Data["Email"] = "astaxie@gmail.com"
        this.TplName = "index.tpl" // version 1.6 use this.TplName = "index.tpl"
}

The following is a breakdown of the different sections of this code.

​ 以下是此代码不同部分的细分。

How Beego dispatches requests Beego 如何分派请求

The MainController is the first thing created. It contains an anonymous struct field of type web.Controller. This is called struct embedding and is the way that Go mimics inheritance. Because of this MainController automatically acquires all the methods of web.Controller.

​ MainController 是创建的第一个内容。它包含一个类型为 web.Controller 的匿名结构字段。这称为结构嵌入，是 Go 模仿继承的方式。因此， MainController 自动获取 web.Controller 的所有方法。

web.Controller has several functions such as Init, Prepare, Post, Get, Delete and Head. These functions can be overwritten by implementing them. In this example the Get method was overwritten.

​ web.Controller 具有多个函数，例如 Init 、 Prepare 、 Post 、 Get 、 Delete 和 Head 。可以通过实现这些函数来覆盖它们。在此示例中，覆盖了 Get 方法。

We talked about the fact that Beego is a RESTful framework so our requests will run the related req.Method method by default. For example, if the browser sends a GET request, it will execute the Get method in MainController. Therefore the Get method and the logic we defined above will be executed.

​ 我们讨论了 Beego 是一个 RESTful 框架这一事实，因此我们的请求将默认运行相关的 req.Method 方法。例如，如果浏览器发送 GET 请求，它将在 MainController 中执行 Get 方法。因此，将执行 Get 方法和我们上面定义的逻辑。

The Get method Get 方法

The logic of the Get method only outputs data. This data will be stored in this.Data, a map[interface{}]interface{}. Any type of data can be assigned here. In this case only two strings are assigned.

​ 方法 Get 的逻辑仅输出数据。此数据将存储在 this.Data 中，这是一个 map[interface{}]interface{} 。可以在这里分配任何类型的数据。在这种情况下，仅分配两个字符串。

Finally the template will be rendered. this.TplName (v1.6 uses this.TplName) specifies the template which will be rendered. In this case it is index.tpl. If a template is not set it will default to controller/method_name.tpl. For example, in this case it would try to find maincontroller/get.tpl.

​ 最后将渲染模板。 this.TplName （v1.6 使用 this.TplName ）指定要渲染的模板。在这种情况下，它是 index.tpl 。如果未设置模板，则默认为 controller/method_name.tpl 。例如，在这种情况下，它将尝试查找 maincontroller/get.tpl 。

There is no need to render manually. Beego will call the Render function (which is implemented in web.Controller) automatically if it is set up in the template.

​ 无需手动渲染。如果在模板中设置了 Render 函数（在 web.Controller 中实现），Beego 将自动调用该函数。

Check the controller section in the MVC Introduction to learn more about these functions. The next section will describe model writing.

​ 查看 MVC 简介中的控制器部分以了解有关这些函数的更多信息。下一节将介绍模型编写。