Akka-http 在 Java 中创建分块实体（从 Scala 转换）

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))
    }

但是我在执行第二种方法时遇到了问题。到目前为止，我做到了这一点：

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));
  }
}

我不知道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，我的方向大体上是正确的吗？

Answer 1

如果您只想从文件中读取的每个 ByteString 元素中创建一个 Chunk，您可以利用 Chunked.fromData（JavaDSL 中的 HttpEntities.createChunked）。

下面是 Scala 端的结果

  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 对应物

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 在 Java 中创建分块实体（从 Scala 转换）

Akka-http create Chunked entity in Java (convert from Scala)

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