play for scala 实现SessionFilter 过滤未登录用户跳转到登录页面

一、编写SessionFilter.scala代码

package filtersimport javax.inject.{Inject, Singleton}import akka.stream.Materializerimport controllers.routesimport play.api.mvc.{Filter, RequestHeader, Result, Results}import scala.concurrent.Future@Singletonclass 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)  } }}

说明：

!requestHeader.session.get("user").isDefined 是用来判断session中是否存在user

!requestHeader.path.contains("/signin") 是用来排除登录页面，这个页面不登录也应该是可见的，防止出现死循环跳转

!requestHeader.path.contains("/assets/") 是用来排除静态资源文件的，如图片、css、JavaScript等

二、在app目录下的Filters.scala中使用SessionFilter

Filters.scala这个文件是activator自动生成的模板，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.HttpFiltersimport 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. */@Singletonclass 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) }}

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