你可以使用反射。

import scala.reflect.ClassTag
import scala.reflect.runtime.universe._

abstract class FieldRequestSupport[SelfType <: Product : ClassTag : TypeTag] {
    self: SelfType =>

    private val classFieldsAccessors: Map[String, MethodSymbol] = typeOf[SelfType].members.collect({
        case m: MethodSymbol if m.isCaseAccessor => m
    }).flatMap(symbol => TermName.unapply(symbol.name).map((_, symbol)))(collection.breakOut)
    private val classMirror: Mirror = runtimeMirror(getClass.getClassLoader)

    def requestField(fieldName: String): Option[Any] = {
        classFieldsAccessors.get(fieldName).map(
            symbol => classMirror.reflect(self).reflectField(symbol).get
        )
    }
}

case class Person(name: String, age: Int) extends FieldRequestSupport[Person]

object Test extends App {
    val person = Person("Bob", 26)
    println(person.requestField("name")) //will print Some(Bob)
    println(person.requestField("age")) //will print Some(26)
    println(person.requestField("qqq")) //will print None
}