Question

我正在尝试将以下代码从Scala转换为Java：

    object ChunkedStaticResponse {
        private def createStaticSource(fileName : String) = 
          FileIO
            .fromPath(Paths get fileName)
            .map(p => ChunkStreamPart.apply(p))


        private def createChunkedSource(fileName : String) =
          Chunked(ContentTypes.`text/html(UTF-8)`, createStaticSource(fileName))

        def staticResponse(page:String) =
        HttpResponse(status = StatusCodes.NotFound,
          entity = createChunkedSource(page))
    }

但我遇到了第二种方法的实施问题。到目前为止，我到目前为止：

class ChunkedStaticResponseJ {

  private Source<HttpEntity.ChunkStreamPart, CompletionStage<IOResult>> 
     createStaticSource(String fileName) {
     return  FileIO
            .fromPath(Paths.get(fileName))
            .map(p -> HttpEntity.ChunkStreamPart.create(p));
  }

  private HttpEntity.Chunked createChunkedSource(String fileName) {
    return HttpEntities.create(ContentTypes.TEXT_HTML_UTF8, 
           createStaticSource(fileName)); // not working
  }

  public HttpResponse staticResponse(String page)  {
    HttpResponse resp =  HttpResponse.create();
    return resp.withStatus(StatusCodes.NOT_FOUND).withEntity(createChunkedSource(page));
  }
}

我无法弄清楚如何在第二种方法中创建分块源。有人可以建议一种方法吗？另外，我通常走在正确的道路上吗？

Answer 1

如果您只想从文件中读取的每个Chunk元素中创建ByteString，您可以利用Chunked.fromData（JavaDSL中的HttpEntities.createChunked）。

以下是Scala方面的结果

  object ChunkedStaticResponse {
    private def createChunkedSource(fileName : String) =
      Chunked.fromData(ContentTypes.`text/html(UTF-8)`, FileIO.fromPath(Paths get fileName))

    def staticResponse(page:String) =
      HttpResponse(status = StatusCodes.NotFound,
        entity = createChunkedSource(page))
  }

这将是它的JavaDSL对应

class ChunkedStaticResponseJ {
    private HttpEntity.Chunked createChunkedSource(String fileName) {
        return HttpEntities.createChunked(ContentTypes.TEXT_HTML_UTF8, FileIO.fromPath(Paths.get(fileName)));
    }

    public HttpResponse staticResponse(String page)  {
        HttpResponse resp =  HttpResponse.create();
        return resp.withStatus(StatusCodes.NOT_FOUND).withEntity(createChunkedSource(page));
    }
}

Akka-http创建Java中的Chunked实体（从Scala转换）

1 个答案: