Scala 会自动关闭 InputStream 吗? [英] Would scala close the InputStream automatically?

问题描述

我是 Scala 的新手，对流关闭机制不熟悉.我写了一些这样的代码.

I'm a newbie of scala and not familiar to the stream close mechanism. I wrote some code like this.

def loadResourceAsString(path: String) = {

  val is = this.getClass().getResourceAsStream(path)

  Source.fromInputStream(is).getLines().mkString("\n")

}

我在 Scala 源代码中发现了这个.Source 将返回一个 BufferedSource，它覆盖关闭方法以关闭输入流.

I found this in scala source code. The Source would return a BufferedSource which override close method to close the input stream.

def fromInputStream(is: InputStream)(implicit codec: Codec): BufferedSource =
  createBufferedSource(is, reset = () => fromInputStream(is)(codec), close = () => is.close())(codec)

如果有异常，scala会不会通过自己的机制执行close方法?

If there was exception, would scala execute the close method by its own mechanism?

或者，我应该像 java 一样在 finally 块中明确关闭输入流吗?

Or, should I close input stream in finally block explicitly just like java?

推荐答案

简而言之 - 没有.createBufferedSource 使用给定的 close 函数创建 BufferedSource，但从不调用 reset 和 close

In short - no. createBufferedSource creates BufferedSource with given close function, but never calls neither for reset not for close

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