Scala Playframework发送文件 [英] Scala Playframework send file

问题描述

我有一个数据字符串，该字符串是从数据库中的数据获取的.我想将其发送给用户，但不创建文件的本地副本，例如

I have a string of data, which I get from data in my database. I want to send it to the user, but without creating a local copy of the file, something like

Ok(MyString).as("file/csv") 

但是它不起作用.我该怎么办?

But it is not working. How can I do it?

推荐答案

您可以通过将chunked与Enumerator结合使用来实现.我还使用withHeaders来指定Result的内容类型和配置为附件"，以便客户端将其解释为要下载的文件(而不是在浏览器本身中打开).

You can do this by using chunked with an Enumerator. I've also used withHeaders to specify the content type and disposition of the Result to "attachment", so that the client will interpret it as a file to download (rather than opening in the browser itself).

import play.api.libs.iteratee.Enumerator

val myString: String = ??? // the String you want to send as a file

Ok.chunked(Enumerator(myString.getBytes("UTF-8")).andThen(Enumerator.eof))
  .withHeaders(
     "Content-Type" -> "text/csv",
     "Content-Disposition" -> "attachment; filename=mystring.csv"
  )

根据从数据库中获取的类型，这可能不会立即编译.

This might not compile right away, depending on the types you're getting from the database.

请考虑一下，这也应该起作用(没有Enumerator):

Come to think of it, this should also work (without the Enumerator):

 Ok(myString).withHeaders( /* headers from above */ )

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