scala get ipv4 address

scala 用 isInstanceOf 会报错（instanceof 这个函数就没有），java 下使用  instanceof 来判断是否是 Inet4Address

test("get ipv4 address") {

  val ipAddr = InetAddress.getLocalHost.getHostAddress

  val interfaces: util.Enumeration[NetworkInterface] = NetworkInterface.getNetworkInterfaces

  while(interfaces.hasMoreElements) {
    val ele = interfaces.nextElement

    val addrs: util.Enumeration[InetAddress] = ele.getInetAddresses

    while(addrs.hasMoreElements) {
      val addr: InetAddress = addrs.nextElement()

      addr match {
        case some: Inet4Address if !addr.isLoopbackAddress =>
          println(some.getHostAddress)
        case _ =>
          // do nothing
      }

    }
  }

}