scala函数，用于比较case类的字段并收集差异

import scala.reflect.runtime.universe._

def compareCaseClasses[T: TypeTag](obj1: T, obj2: T): Map[String, Any] = {
  val mirror = runtimeMirror(getClass.getClassLoader)
  val classSymbol = typeOf[T].typeSymbol.asClass
  val classMirror = mirror.reflectClass(classSymbol)
  val constructor = typeOf[T].decl(termNames.CONSTRUCTOR).asMethod
  val constructorMirror = classMirror.reflectConstructor(constructor)
  
  val fields = typeOf[T].members.collect {
    case m: MethodSymbol if m.isCaseAccessor => m
  }.toList
  
  val values1 = fields.map { field =>
    val value = mirror.reflect(obj1).reflectField(field).get
    field.name.toString -> value
  }.toMap
  
  val values2 = fields.map { field =>
    val value = mirror.reflect(obj2).reflectField(field).get
    field.name.toString -> value
  }.toMap
  
  values1.filterNot { case (name, value) =>
    values2.get(name).contains(value)
  }
}

case class Person(name: String, age: Int, address: String)

val person1 = Person("Alice", 25, "123 Main St")
val person2 = Person("Bob", 30, "456 Elm St")

val diff = compareCaseClasses(person1, person2)
diff.foreach { case (field, value) =>
  println(s"$field: $value")
}

name: Alice
age: 25
address: 123 Main St