从 Scala 目录中读取文件
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Reading files from a directory in Scala
提问by snappy
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.
如何获取 Scala 目录中的文件列表（例如，或所有 *.txt 文件）。Source 类似乎没有帮助。
回答by huynhjl
new java.io.File(dirName).listFiles.filter(_.getName.endsWith(".txt"))
回答by Nick Cecil
The JDK7 version, using the new DirectoryStream class is:
JDK7 版本，使用新的 DirectoryStream 类是：
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'.
这不是一个字符串，而是返回一个 Path，它上面有很多方便的方法，比如 'relativize' 和 'subpath'。
Note that you will also need to import import scala.collection.JavaConversions._to enable interop with Java collections.
请注意，您还需要导入import scala.collection.JavaConversions._以启用与 Java 集合的互操作。
回答by Dave Griffith
The Java File class is really all you need, although it's easy enough to add some Scala goodness to iteration over directories easier.
Java File 类确实是您所需要的，尽管添加一些 Scala 优点来更轻松地遍历目录也很容易。
import scala.collection.JavaConversions._
for(file <- myDirectory.listFiles if file.getName endsWith ".txt"){
// process the file
}
回答by Daniel C. Sobral
For now, you should use Java libraries to do so.
现在，您应该使用 Java 库来执行此操作。
