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

问题描述

我正在使用此代码在服务器上上传图像，这是我从此链接获得的 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),Some(jValuefirstPoint),Some(jValuesecondPoint),(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，但在响应中我想从存储库中获取响应。我如何等待存储库的响应返回此内容？

你能告诉我我该怎么做吗？ 提前致谢。

解决方法

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"))
}

有两个问题：

• 你的if/else的回报被Ok(s"picturePaths ${picturePaths}")吞没了
• 假设您的业务逻辑返回 Future[_]，您需要到处“传播”未来

这样的事情应该可以工作：

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 中的 Future 和 getOrElse。