Reading files from a directory in Scala

Question

How do I get the list of files (or all *.txt files for example) in a directory in Scala. The Source class does not seem to help.

Answer 1

The Java File class is really all you need, although it's easy enough to add some Scala goodness to iteration over directories easier.

import scala.collection.JavaConversions._

for(file <- myDirectory.listFiles if file.getName endsWith ".txt"){
   // process the file
}

Answer 2

The JDK7 version, using the new DirectoryStream class is:

import java.nio.file.{Files, Path}
Files.newDirectoryStream(path)
    .filter(_.getFileName.toString.endsWith(".txt"))
    .map(_.toAbsolutePath)

Instead of a string, this returns a Path, which has loads of handy methods on it, like 'relativize' and 'subpath'.

Note that you will also need to import import scala.collection.JavaConversions._ to enable interop with Java collections.

Answer 3

new java.io.File(dirName).listFiles.filter(_.getName.endsWith(".txt"))

Answer 4

For now, you should use Java libraries to do so.