一、编写sessionfilter.scala代码
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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
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