FileIO.fromPath

Emits the contents of a file from the given path.

File IO Sinks and Sources

def fromPath(f: Path, chunkSize: Int = 8192): Source[ByteString, Future[IOResult]]
def fromPath(f: Path, chunkSize: Int, startPosition: Long): Source[ByteString, Future[IOResult]]

Description

Emits the contents of a file from the given path, as ByteStrings, materializes into a Future CompletionStage which will be completed with a IOResult upon reaching the end of the file or if there is a failure.

Example

Scala

copysourceimport akka.stream.scaladsl._
val file = Paths.get("example.csv")

val foreach: Future[IOResult] = FileIO.fromPath(file).to(Sink.ignore).run()

Java

copysourcefinal Path file = Paths.get("example.csv");
  Sink<ByteString, CompletionStage<Done>> printlnSink =
      Sink.<ByteString>foreach(chunk -> System.out.println(chunk.utf8String()));

  CompletionStage<IOResult> ioResult = FileIO.fromPath(file).to(printlnSink).run(mat);