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一、編寫SessionFilter.scala代碼

									package filters

									import javax.inject.{Inject, Singleton}

									import akka.stream.Materializer

									import controllers.routes

									import play.api.mvc.{Filter, RequestHeader, Result, Results}

									import scala.concurrent.Future

									@Singleton

									class SessionFilter @Inject()(implicit val mat: Materializer) extends Filter {

									 def apply(nextFilter: RequestHeader => Future[Result])

									      (requestHeader: RequestHeader): Future[Result] = {

									  if (!requestHeader.session.get("user").isDefined && !requestHeader.path.contains("/signin") && !requestHeader.path.contains("/assets/")) {

									   Future.successful(Results.Redirect(routes.SignController.showSignin()))

									  } else {

									   nextFilter(requestHeader)

									  }

									 }

									}

說明：

!requestHeader.session.get("user").isDefined 是用來判斷session中是否存在user

!requestHeader.path.contains("/signin") 是用來排除登錄頁面，這個頁面不登錄也應該是可見的，防止出現死循環跳轉

!requestHeader.path.contains("/assets/") 是用來排除靜態資源文件的，如圖片、css、JavaScript等

二、在app目錄下的Filters.scala中使用SessionFilter

Filters.scala這個文件是activator自動生成的模板，要使用SessionFilter只要在里面加上sessionFilter: SessionFilter和Seq(sessionFilter)就可以了

									import javax.inject._

									import filters.{ExampleFilter, SessionFilter}

									import play.api._

									import play.api.http.HttpFilters

									import play.api.mvc._

									/**

									 * This class configures filters that run on every request. This

									 * class is queried by Play to get a list of filters.

									 *

									 * Play will automatically use filters from any class called

									 * `Filters` that is placed the root package. You can load filters

									 * from a different class by adding a `play.http.filters` setting to

									 * the `application.conf` configuration file.

									 *

									 * @param env Basic environment settings for the current application.

									 * @param exampleFilter A demonstration filter that adds a header to

									 * each response.

									 */

									@Singleton

									class Filters @Inject() (

									 env: Environment,

									 exampleFilter: ExampleFilter, sessionFilter: SessionFilter) extends HttpFilters {

									 override val filters = {

									  // Use the example filter if we're running development mode. If

									  // we're running in production or test mode then don't use any

									  // filters at all.

									  if (env.mode == Mode.Dev) Seq(exampleFilter) else Seq.empty

									  Seq(sessionFilter)

									 }

									}