[英]How to type cast Any dynamically in scala?
I want to convert "Any" object into an object of runtime type. 我想将“任何”对象转换为运行时类型的对象。 Based on the class name (string) at the runtime, how do I convert an ANY object to actual object?
基于运行时的类名称(字符串),如何将ANY对象转换为实际对象?
I tried using converting class name into class object using Class.forName 我尝试使用Class.forName将类名转换为类对象
val clazz = Class.forName("my.package.Animal")
val any: Any = Animal(1, "simba")
any.asInstanceOf[clazz] // Compilation Error // Looking for a solution
Try to use 尝试使用
compiler toolbox 编译器工具箱
package my.package import scala.tools.reflect.ToolBox import scala.reflect.runtime.universe._ case class Animal(id: Int, name: String) object App { val any: Any = Animal(1, "simba") val className = "my.package.Animal" val mirror = runtimeMirror(getClass.getClassLoader) val tb = mirror.mkToolBox() tb.eval(tb.parse( s""" import my.package.App._ val animal = any.asInstanceOf[$className] println(animal.id) println(animal.name) """)) }
libraryDependencies += scalaOrganization.value % "scala-reflect" % scalaVersion.value
libraryDependencies += scalaOrganization.value % "scala-compiler" % scalaVersion.value
or Scala reflection 或Scala反射
import scala.reflect.runtime.universe._ val mirror = runtimeMirror(getClass.getClassLoader) val classSymbol = mirror.staticClass(className) val typ = classSymbol.toType val idMethodSymbol = typ.decl(TermName("id")).asMethod val nameMethodSymbol = typ.decl(TermName("name")).asMethod val instanceMirror = mirror.reflect(any) val idMethodMirror = instanceMirror.reflectMethod(idMethodSymbol) val nameMethodMirror = instanceMirror.reflectMethod(nameMethodSymbol) println(idMethodMirror()) println(nameMethodMirror())
libraryDependencies += scalaOrganization.value % "scala-reflect" % scalaVersion.value
or Java reflection 或Java反射
val clazz = Class.forName(className) val idMethod = clazz.getMethod("id") val nameMethod = clazz.getMethod("name") println(idMethod.invoke(any)) println(nameMethod.invoke(any))
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