javaTemplates-Study Notes 3_html/css_WEB-ITnose

Routes entrance

The application entrance of the background language all starts from routes. If you want to create a new page, you must learn to configure routes. The conf/routes file defines the actions of all application URLs. (Action), if the browser requests access to http://localhost:9000/, the application will return a page. At this time, the initial format of routes is as follows

# Routes# This file defines all application routes (Higher priority routes first)# ~~~~# Home pageGET     /                           controllers.Application.index

literally means Home page [The default home page is index.scala.html under view].

This definition tells play to call the index method of controllers containing the Application class when it receives an HTTP GET/POST type request and the path is [/] , the corresponding code is as follows:

package controllersimport play.api._import play.api.mvc._object Application extends Controller {  def index = Action {    Ok(views.html.index("Your new application is ready."))  }}

If you want to specify which file you can modify routes:

# Home pageGET     /index.html                           controllers.Application.index

At this time, the accessed address needs to add the file name [http://localhost:9000/index.html].

Understand Routes and Controller

The routes definition above / /index.html corresponds to the index method in the Application.scala code block to display web page content:

//所有的控制台代码按play规范均归入controllers包package controllers//导入play应用开发所需要的类库import play.api._import play.api.mvc._//Application全局对象实例化,因此使用Object来声明Application并继承play的Controller类object Application extends Controller {//定义index方法,任何toutes文件中指定调用的方法,必须放回Action对象来处理HTTP请求  def index = Action {    //任何ACtion对象必须获得反返回的Result对象    //OK继承于Result对象,所以返回OK表示其包含的内容为HTTP 200 OK的状态    //在Scala最后一行代码等同于 return OK(views.html.index("Your new application is ready."))    Ok(views.html.index("Your new application is ready."))  }}　　

def This statement is like the code block statement in Rython and Ruby.

OK indicates that the HTTP request is successful. You can try to modify the content:

Ok(views.html.index("Hello World!"))

The header in the template page becomes Hello World! .

View new file

After understanding the relationship between routes Application Controller you can create files yourself.

GET     /show.html                            controllers.Application.show

  def show = Action {    Ok(views.html.index("Hello World!"))  }

Create a new file show.scala.html in view and run the code block in copy index.scala.html... Then you can access it at http://localhost:9000/show.html.