一、编写SessionFilter.scala代码

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) } } }

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.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) } }

以上所述是小编给大家介绍的play for scala 实现SessionFilter 过滤未登录用户跳转到登录页面，希望对大家有所帮助，如果大家有任何疑问请给我们留言，小编会及时回复大家的。在此也非常感谢大家对查字典教程网的支持！