scala - 从 Java 属性获取 Scala 映射

Question

我试图使用 java Iterators 和/或 Enumerations 将环境变量拉入 scala 脚本，并意识到 Frankenstein 博士可能声称出身，所以我从丑陋的树中修改了以下内容:

import java.util.Map.Entry
import System._

val propSet = getProperties().entrySet().toArray()
val props   = (0 until propSet.size).foldLeft(Map[String, String]()){(m, i) =>
  val e = propSet(i).asInstanceOf[Entry[String, String]]
  m + (e.getKey() -> e.getValue())
}

例如打印上述相同的环境

props.keySet.toList.sortWith(_ < _).foreach{k =>
  println(k+(" " * (30 - k.length))+" = "+props(k))
}

拜托，请不要着手完善这个 t$#d，只需向我展示我确信在这种情况下存在的 scala gem(即 java 属性 --> scala.Map)，提前致谢；@)

Answer 1

斯卡拉 2.10.3

import scala.collection.JavaConverters._

//Create a variable to store the properties in
val props = new Properties

//Open a file stream to read the file
val fileStream = new FileInputStream(new File(fileName))
props.load(fileStream)
fileStream.close()

//Print the contents of the properties file as a map
println(props.asScala.toMap)