您可以使用Scala的反射库来完成此操作.

You can accomplish this with Scala's reflection library.

虽然不是特别漂亮:

import scala.reflect.runtime.{ universe => u }
import scala.reflect.runtime.universe._

object ReflectionHelper {

  val classLoader = Thread.currentThread().getContextClassLoader

  val mirror = u.runtimeMirror(classLoader)

  def getFieldType(className: String, fieldName: String): Option[Type] = {

    val classSymbol = mirror.staticClass(className)

    for {
      fieldSymbol <- classSymbol.selfType.members.collectFirst({
        case s: Symbol if s.isPublic && s.name.decodedName.toString() == fieldName => s
      })
    } yield {

      fieldSymbol.info.resultType
    }
  }

  def maybeUnwrapFieldType[A](fieldType: Type)(implicit tag: TypeTag[A]): Option[Type] = {
    if (fieldType.typeConstructor == tag.tpe.typeConstructor) {
      fieldType.typeArgs.headOption
    } else {
      Option(fieldType)
    }
  }

  def getFieldClass(className: String, fieldName: String): java.lang.Class[_] = {

    // case normal field return its class
    // case Option field return generic type of Option

    val result = for {
      fieldType <- getFieldType(className, fieldName)
      unwrappedFieldType <- maybeUnwrapFieldType[Option[_]](fieldType)
    } yield {
      mirror.runtimeClass(unwrappedFieldType)
    }

    // Consider changing return type to: Option[Class[_]]
    result.getOrElse(null)
  }
}

然后:

ReflectionHelper.getFieldClass("myapp.model.Person", "age")  // int
ReflectionHelper.getFieldClass("myapp.model.Person", "name") // class java.lang.String

如果字段值没有意义，我建议将getFieldClass的返回类型更改为可选！

I would recommend changing the return type of getFieldClass to be optional in case the field value doesn't make sense!