activatorをインストール
brew install typesafe-activator
プロジェクトの作成
activator new myapp play-scala
myappというディレクトリができました．
myappに移動して，sbt compileでコンパイルしsbt runで実行します．
http://localhost:9000/にアクセスすると，play frameworkの画面がでてきました．
とりあえずプロジェクト作成時に出てきたソースコードを見てみる．
conf/routes
# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~
# An example controller showing a sample home page
GET / controllers.HomeController.index
# An example controller showing how to use dependency injection
GET /count controllers.CountController.count
# An example controller showing how to write asynchronous code
GET /message controllers.AsyncController.message
# Map static resources from the /public folder to the /assets URL path
GET /assets/*file controllers.Assets.versioned(path="/public", file: Asset)
requestMapping的な何かをしてそうなところ
HomeControllerを見てみる
package controllers
import javax.inject._
import play.api._
import play.api.mvc._
@Singleton
class HomeController @Inject() extends Controller {
def index = Action {
Ok(views.html.index("Your new application is ready."))
}
}
views/index.scala.htmlを返してそう
index.scala.htmlは同じところにあるmain.scala.htmlを読んでいるらしい
CountControllerを見てみる
package controllers
import javax.inject._
import play.api._
import play.api.mvc._
import services.Counter
@Singleton
class CountController @Inject() (counter: Counter) extends Controller {
def count = Action { Ok(counter.nextCount().toString) }
}
counter.nextCount()を呼んでそう
counterクラスを呼んでそう
Counter.scalaを見てみる
package services
import java.util.concurrent.atomic.AtomicInteger
import javax.inject._
/**
* This trait demonstrates how to create a component that is injected
* into a controller. The trait represents a counter that returns a
* incremented number each time it is called.
*/
trait Counter {
def nextCount(): Int
}
/**
* This class is a concrete implementation of the [[Counter]] trait.
* It is configured for Guice dependency injection in the [[Module]]
* class.
*
* This class has a `Singleton` annotation because we need to make
* sure we only use one counter per application. Without this
* annotation we would get a new instance every time a [[Counter]] is
* injected.
*/
@Singleton
class AtomicCounter extends Counter {
private val atomicCounter = new AtomicInteger()
override def nextCount(): Int = atomicCounter.getAndIncrement()
}
トレイトを実装したAtomicCounterがあった
getAndIncrement()で1足した値を取得してるっぽい
返ってきたやつをtoStringして出力といった感じ
とりあえずコントローラーにメソッドを一つ追加してみる
conf/routesを変更
GET /test controllers.TestController.test
TestControllerの追加
package controllers
import javax.inject.Inject
import play.api.mvc.{Action, Controller}
/**
* Created by mituba on 2017/06/29.
*/
class TestController @Inject() extends Controller {
def test = Action {
Ok("hello")
}
}
実行してhttp://localhost:9000/testにアクセスするとhelloという文字が出た
とりあえずリクエストパラメータをもらってみる
conf/routesの変更
GET /params controllers.ParamController.getParam
ParamController.scalaの追加
package controllers
import javax.inject.Inject
import play.api.mvc.{Action, Controller}
/**
* Created by mituba on 2017/06/29.
*/
class ParamController @Inject() extends Controller {
def getParam = Action { request =>
val params : Map[String, Seq[String]] = request.queryString
val message = params("message").head
Ok(message)
}
}
実行してhttp://localhost:9000/params?message=helloにアクセスすると，helloと表示された．
まとめ
後はJSONの送り合いとDB処理の実装について調べてみたい．
