在Play 2.0(scala)中设置HTTP标头? [英] Setting HTTP headers in Play 2.0 (scala)?

问题描述

我正在Scala上试用Pla​​y 2.0框架.我试图弄清楚如何发送自定义HTTP标头-在这种情况下为"Content-Disposition:attachment; filename = foo.bar".我似乎找不到有关如何执行此操作的文档(此时Play 2.0上的文档总体上很少).

I'm experimenting with the Play 2.0 framework on Scala. I'm trying to figure out how to send down custom HTTP headers--in this case, "Content-Disposition:attachment; filename=foo.bar". I can't seem to find documentation on how to do so (documentation on Play 2.0 is overall pretty sparse at this point).

有任何提示吗?

推荐答案

结果类型在play.api.mvc.Results中，请参见

The result types are in play.api.mvc.Results, see here on GitHub.

要添加标题，您需要编写:

In order to add headers, you'd write:

Ok
  .withHeaders(CONTENT_TYPE -> "application/octet-stream")
  .withHeaders(CONTENT_DISPOSITION -> "attachment; filename=foo.txt")

或

Ok.withHeaders(
  CONTENT_TYPE -> "application/octet-stream",
  CONTENT_DISPOSITION -> "attachment; filename=foo.txt"
)

这是完整的示例下载:

def download = Action {
  import org.apache.commons.io.IOUtils
  val input = Play.current.resourceAsStream("public/downloads/Image.png")
  input.map { is =>
    Ok(IOUtils.toByteArray(is))
      .withHeaders(CONTENT_DISPOSITION -> "attachment; filename=foo.png")
  }.getOrElse(NotFound("File not found!"))
}

要下载文件，Play现在提供了另一种简单的方法:

To download a file, Play now offers another simple way:

def download = Action {
  Ok.sendFile(new java.io.File("public/downloads/Image1.png"), fileName = (name) => "foo.png")
}

缺点是，如果找不到该文件，则会导致异常.此外，文件名是通过函数指定的，这似乎有些过分.

The disadvantage is that this results in an exception if the file is not found. Also, the filename is specified via a function, which seems a bit overkill.

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