以下是两个使用Akka Stream的示例代码：

示例1：从文件读取行并将其打印到控制台

import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import akka.stream.scaladsl._

import scala.concurrent.ExecutionContext.Implicits.global

object FileToConsoleExample extends App {
  implicit val system = ActorSystem("FileToConsoleExample")
  implicit val materializer = ActorMaterializer()

  val source = FileIO.fromPath(Paths.get("path/to/input.txt"))
  val flow = Framing.delimiter(ByteString("\n"), maximumFrameLength = 256, allowTruncation = true)
    .map(_.utf8String)
  val sink = Sink.foreach(println)

  val graph = source.via(flow).to(sink)

  graph.run()
    .onComplete(_ => system.terminate())
}

示例2：从HTTP服务器接收请求并将响应写入文件

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.stream.ActorMaterializer
import akka.stream.scaladsl._

import scala.concurrent.ExecutionContext.Implicits.global

object HttpToFileExample extends App {
  implicit val system = ActorSystem("HttpToFileExample")
  implicit val materializer = ActorMaterializer()

  val request = HttpRequest(uri = "http://example.com")
  val flow = Http().outgoingConnection("example.com")
  val sink = FileIO.toPath(Paths.get("path/to/output.txt"))

  val graph = Source.single(request).via(flow).to(sink)

  graph.run()
    .onComplete(_ => system.terminate())
}

这些示例分别演示了如何从文件中读取数据并将其打印到控制台，以及如何从HTTP服务器接收请求并将响应写入文件。您可以根据自己的需求进行修改和扩展这些示例。