还有JCommander(免责声明:我创建了它):

object Main {
  object Args {
    @Parameter(
      names = Array("-f", "--file"),
      description = "File to load. Can be specified multiple times.")
    var file: java.util.List[String] = null
  }

  def main(args: Array[String]): Unit = {
    new JCommander(Args, args.toArray: _*)
    for (filename <- Args.file) {
      val f = new File(filename)
      printf("file: %s\n", f.getName)
    }
  }
}

另一个库:scarg

我刚刚在scalac的scala.tools.cmd包中找到了一个广泛的命令行解析库。

参见http://www.assembla.com/code/scala-eclipse-toolchain/git/nodes/src/compiler/scala/tools/cmd?rev=f59940622e32384b1e08939effd24e924a8ba8db

对于相对简单的配置，我喜欢滑动参数。

var name = ""
var port = 0
var ip = ""
args.sliding(2, 2).toList.collect {
  case Array("--ip", argIP: String) => ip = argIP
  case Array("--port", argPort: String) => port = argPort.toInt
  case Array("--name", argName: String) => name = argName
}

我喜欢这段代码的简洁外观…从这里的讨论中收集到: http://www.scala-lang.org/old/node/4380

object ArgParser {
  val usage = """
Usage: parser [-v] [-f file] [-s sopt] ...
Where: -v   Run verbosely
       -f F Set input file to F
       -s S Set Show option to S
"""

  var filename: String = ""
  var showme: String = ""
  var debug: Boolean = false
  val unknown = "(^-[^\\s])".r

  val pf: PartialFunction[List[String], List[String]] = {
    case "-v" :: tail => debug = true; tail
    case "-f" :: (arg: String) :: tail => filename = arg; tail
    case "-s" :: (arg: String) :: tail => showme = arg; tail
    case unknown(bad) :: tail => die("unknown argument " + bad + "\n" + usage)
  }

  def main(args: Array[String]) {
    // if there are required args:
    if (args.length == 0) die()
    val arglist = args.toList
    val remainingopts = parseArgs(arglist,pf)

    println("debug=" + debug)
    println("showme=" + showme)
    println("filename=" + filename)
    println("remainingopts=" + remainingopts)
  }

  def parseArgs(args: List[String], pf: PartialFunction[List[String], List[String]]): List[String] = args match {
    case Nil => Nil
    case _ => if (pf isDefinedAt args) parseArgs(pf(args),pf) else args.head :: parseArgs(args.tail,pf)
  }

  def die(msg: String = usage) = {
    println(msg)
    sys.exit(1)
  }

}

对于大多数情况，您不需要外部解析器。Scala的模式匹配允许以函数式风格使用参数。例如:

object MmlAlnApp {
  val usage = """
    Usage: mmlaln [--min-size num] [--max-size num] filename
  """
  def main(args: Array[String]) {
    if (args.length == 0) println(usage)
    val arglist = args.toList
    type OptionMap = Map[Symbol, Any]

    def nextOption(map : OptionMap, list: List[String]) : OptionMap = {
      def isSwitch(s : String) = (s(0) == '-')
      list match {
        case Nil => map
        case "--max-size" :: value :: tail =>
                               nextOption(map ++ Map('maxsize -> value.toInt), tail)
        case "--min-size" :: value :: tail =>
                               nextOption(map ++ Map('minsize -> value.toInt), tail)
        case string :: opt2 :: tail if isSwitch(opt2) => 
                               nextOption(map ++ Map('infile -> string), list.tail)
        case string :: Nil =>  nextOption(map ++ Map('infile -> string), list.tail)
        case option :: tail => println("Unknown option "+option) 
                               exit(1) 
      }
    }
    val options = nextOption(Map(),arglist)
    println(options)
  }
}

将打印，例如:

Map('infile -> test/data/paml-aln1.phy, 'maxsize -> 4, 'minsize -> 2)

这个版本只需要一个文件。很容易改进(通过使用列表)。

还要注意，这种方法允许连接多个命令行参数——甚至超过两个!