Question

注意：此问题与How can I get all object vals and subobject vals using reflection in Scala?

不重复

该问题中提供的答案仅适用于最终成员。

例如：

scala> object Settings {
     |   val Host = "host"
     | }
defined module Settings

deepMembers(Settings)
res0: Map[String,String] = Map()

Answer 1

它必须是重复的，但我需要复习：

$ scala
Welcome to Scala version 2.11.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45).
Type in expressions to have them evaluated.
Type :help for more information.

scala> object Settings { val Host = "host" ; val Guest = "guest" }
defined object Settings

scala> import reflect.runtime._,universe._
import reflect.runtime._
import universe._

scala> val im = currentMirror reflect Settings
im: reflect.runtime.universe.InstanceMirror = instance mirror for Settings$@c8e4bb0

scala> im.symbol.asClass.typeSignature.members filter (s => s.isTerm && s.asTerm.isAccessor)
res0: Iterable[reflect.runtime.universe.Symbol] = SynchronizedOps(value Guest, value Host)

scala> res0 map (im reflectMethod _.asMethod) map (_.apply())
res2: Iterable[Any] = List(guest, host)

Answer 2

val members = Settings.getClass.getDeclaredFields.map(_.getName).filterNot(_ == "MODULE$")
members: Array[String] = Array(Host)

这有效，但我认为肯定有更好的方法。

如何在Scala中使用反射获取所有（非最终）对象val和子对象val？

2 个答案: