Scala脚本复制文件 [英] Scala script to copy files

问题描述

我想在scala脚本中将文件a.txt复制到newDir /。
在java中，这将通过为2个文件创建2个文件流，从a.txt读入缓冲区并将其写入新文件的FileOutputStream来完成。
有没有更好的方法来实现这个在scala？可能是scala.tools.nsc.io.的东西。

解决方案

出于性能考虑，最好使用java.nio.Channel

pre> import java.io. {file，FileInputStream，FileOutputStream}
val src = new File（args（0））
val dest = new File（args 1））
new FileOutputStream（dest）getChannel（）transferFrom（
new FileInputStream（src）getChannel，0，Long.MaxValue）
test.txt 的文件：

<$> p $ p> Hello World


创建 test.txt ，从命令行运行以下命令：

  scala copy.scala test.txt test-copy.txt 
  

验证 test-copy.txt 有 Hello World 作为其内容。

I want to copy file a.txt to newDir/ from within a scala script. In java this would be done by creating 2 file streams for the 2 files, reading into buffer from a.txt and writing it to the FileOutputStream of the new file. Is there a better way to achieve this in scala? May be something in scala.tools.nsc.io._. I searched around but could not find much.

解决方案

For performance reasons it is better to use java.nio.Channel to do the copying.

Listing of copy.scala:

import java.io.{File,FileInputStream,FileOutputStream}
val src = new File(args(0))
val dest = new File(args(1))
new FileOutputStream(dest) getChannel() transferFrom(
    new FileInputStream(src) getChannel, 0, Long.MaxValue )

To try this out create a file called test.txt with the following content:

Hello World

After creating test.txt, run the following from the command line:

scala copy.scala test.txt test-copy.txt

Verify that test-copy.txt has Hello World as its content.

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