我对akka世界有点陌生,所以我的知识范围很小。我正在创建一个https服务器并使用akka流和http处理它,对于特定的URL,我需要将文件发送回客户端。
I am a little new to akka world, so my domain of knowledge is a bit small. I am creating an https server and handling it using akka streams and http, for a specific url, i need to send a file back to client. How can i achieve that using akka streams and avoiding the akka routes.
def handleCall(request:HttpRequest):HttpResponse = { logger.info("Request is {}",request) val uri:String = request.getUri().path() if(uri == "/download"){ val f = new File("/1000.txt") logger.info("file download") return HttpEntity( //What should i put here if i want to return a text file. ) }推荐答案
如果文件可能很大,则您不希望在将其发送到客户端之前将全部内容消耗到内存中。这可以通过纯粹基于流的解决方案来解决:
If the file is likely to be large then you don't want to consume the entire contents into memory before sending it to the client. This is solved via a purely stream based solution:
import scala.io import akka.stream.scaladsl.Source import akka.http.scaladsl.model.HttpEntity.{Chunked, ChunkStreamPart} import akka.http.scaladsl.model.{HttpResponse, ContentTypes} val fileContentsSource : (String, String) => Source[ChunkStreamPart, _] = (fileName, enc) => Source .fromIterator( io.Source.fromFile(fileName, enc).getLines ) .map(ChunkStreamPart.apply) val fileEntityResponse : (String, String) => HttpResponse = (fileName, enc) => HttpResponse(entity = Chunked(ContentTypes.`text/plain(UTF-8)`, fileContentsSource(fileName, enc)))现在,您可以创建并发送HttpResponse,而无需服务器保留所有内容:
Now you can create and send an HttpResponse without having the server keep the entire contents:
val httpResp : HttpResponse = fileEntityResponse("/foo/log.txt", "UTF8")更多推荐
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