用scala动态访问protobuf字段名

import com.google.protobuf.{CodedInputStream, CodedOutputStream}
import com.google.protobuf.Descriptors.FieldDescriptor

// 定义一个Protobuf消息类
case class MyMessage(field1: String, field2: Int)

// 创建一个MyMessage实例
val message = MyMessage("value1", 42)

// 获取MyMessage类的运行时描述符
val descriptor = message.getClass.getMethods
  .find(_.getName == "toByteArray")
  .map(_.getReturnType)
  .getOrElse(throw new RuntimeException("Cannot find descriptor"))

// 创建一个CodedInputStream来读取消息
val input = CodedInputStream.newInstance(message.toByteArray)

// 使用反射获取字段描述符
val fieldDescriptor = descriptor.getFields.find(_.getName == "field1")
  .getOrElse(throw new RuntimeException("Cannot find field descriptor"))

// 根据字段描述符的类型读取字段值
val fieldValue = fieldDescriptor.getJavaType match {
  case FieldDescriptor.JavaType.STRING => input.readString()
  case FieldDescriptor.JavaType.INT => input.readInt32()
  // 其他类型的处理...
  case _ => throw new RuntimeException("Unsupported field type")
}

// 打印字段值
println(fieldValue)