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

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 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")http:// && !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

* chttp://lass 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)

}

}

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