public void streamFile() throws IOException, FileNotFoundException, InterruptedException, ExecutionException { String url = "http://example.com"; // #stream-to-file File file = File.createTempFile("stream-to-file-", ".txt"); FileOutputStream outputStream = new FileOutputStream(file); // Make the request CompletionStage<StreamedResponse> futureResponse = ws.url(url).setMethod("GET").stream(); CompletionStage<File> downloadedFile = futureResponse.thenCompose( res -> { Source<ByteString, ?> responseBody = res.getBody(); // The sink that writes to the output stream Sink<ByteString, scala.concurrent.Future<scala.runtime.BoxedUnit>> outputWriter = Sink.<ByteString>foreach(bytes -> outputStream.write(bytes.toArray())); // Converts the materialized Scala Future into a Java8 `CompletionStage` Sink<ByteString, CompletionStage<?>> convertedOutputWriter = outputWriter.mapMaterializedValue(FutureConverters::toJava); // materialize and run the stream CompletionStage<File> result = responseBody .runWith(convertedOutputWriter, materializer) .whenComplete( (value, error) -> { // Close the output stream whether there was an error or not try { outputStream.close(); } catch (IOException e) { } }) .thenApply(v -> file); return result; }); // #stream-to-file downloadedFile.toCompletableFuture().get(); file.delete(); }
public void streamSimpleRequest() { String url = "http://example.com"; // #stream-count-bytes // Make the request CompletionStage<StreamedResponse> futureResponse = ws.url(url).setMethod("GET").stream(); CompletionStage<Long> bytesReturned = futureResponse.thenCompose( res -> { Source<ByteString, ?> responseBody = res.getBody(); // Count the number of bytes returned Sink<ByteString, scala.concurrent.Future<Long>> bytesSum = Sink.fold(0L, (total, bytes) -> total + bytes.length()); // Converts the materialized Scala Future into a Java8 `CompletionStage` Sink<ByteString, CompletionStage<Long>> convertedBytesSum = bytesSum.mapMaterializedValue(FutureConverters::toJava); return responseBody.runWith(convertedBytesSum, materializer); }); // #stream-count-bytes }