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") && !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)
 }
}

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