Play Framework - 上传文件后响应 JSON (multipartFormData)

Question

我正在使用此代码在服务器上上传图片，这是我从 link play upload

 def upload = Action(parse.multipartFormData) { request =>
    request.body
      .file("picture")
      .map { picture =>
        val dataParts = request.body.dataParts;

        val filename = Paths.get(picture.filename).getFileName
        val fileSize = picture.fileSize
        val contentType = picture.contentType

         val picturePaths =
           picture.ref.copyTo(
             Paths.get(
               s"/opt/docker/images/$filename"
             ),
             replace = true
           )
        if (dataParts.get("firstPoint") == None) {
          val pointlocation = new Point_LocationModel(
            dataParts.get("step").get(0),
            dataParts.get("backgroundTargetName").get(0),
            dataParts.get("x").get(0),
            dataParts.get("y").get(0),
            dataParts.get("z").get(0),
            dataParts.get("rotation").get(0),
            dataParts.get("note").get(0),
            dataParts.get("tag").get(0),
            dataParts.get("work_session_id").get(0),
            (picturePaths).toString
          )
          point_LocationRepository.create(pointlocation).map { data =>
            Created(Json.toJson(data._2))
          }
        } else {
          val jValuefirstPoint =
            Json.parse(dataParts.get("firstPoint").get(0)).as[PointModel]
          val jValuesecondPoint =
            Json.parse(dataParts.get("secondPoint").get(0)).as[PointModel]

          val pointlocation = new Point_LocationModel(
            dataParts.get("step").get(0),
            dataParts.get("backgroundTargetName").get(0),
            Some(jValuefirstPoint),
            Some(jValuesecondPoint),
            dataParts.get("rotation").get(0),
            dataParts.get("note").get(0),
            dataParts.get("tag").get(0),
            dataParts.get("work_session_id").get(0),
            (picturePaths).toString
          )
          point_LocationRepository.create(pointlocation).map { data =>
            logger.info(s"repoResponse:  ${data}");
            Created(Json.toJson(data._2))
          }
        }
        Ok(s"picturePaths ${picturePaths}")

      }
      .getOrElse(Ok("Invalid Format"))
  }

此代码运行良好，但在响应时我想从存储库中获取响应。我如何等待存储库对 return 的响应？

你能告诉我我该怎么做吗？提前致谢。

Answer 1

如果我们将您的代码简化为基本部分，您将：

def upload = Action(parse.multipartFormData) { request =>
    request.body
      .file("picture")
      .map { picture =>
        if (someConditionA) {
          someBusinessLogicA().map { data =>
            Created(Json.toJson(data._2))
          }
        } else {
          someBusinessLogicB().map { data =>
            Created(Json.toJson(data._2))
          }
        }
        Ok(s"picturePaths ${picturePaths}")
      }
      .getOrElse(Ok("Invalid Format"))
}

有2个问题：

你的if/else的return被Ok(s"picturePaths ${picturePaths}")
假设您的业务逻辑 returns Future[_] 您需要到处“传播”Future

像这样的东西应该可以工作：

def upload = Action.async(parse.multipartFormData) { request =>
    request.body
      .file("picture")
      .map { picture =>
        if (someConditionA) {
          someBusinessLogicA().map { data =>
            Created(Json.toJson(data._2))
          }
        } else {
          someBusinessLogicB().map { data =>
            Created(Json.toJson(data._2))
          }
        }
      }
      .getOrElse(Future.successful(Ok("Invalid Format")))
}

注意Action.async和getOrElse中的Future。

Play Framework - 上传文件后响应 JSON (multipartFormData)

Play Framework - Respond with JSON after uploading a file (multipartFormData)

scala

playframework-2.0