byte数组转16进制

fun ByteArray.toHex(): String = joinToString(separator = "") { eachByte -> "%02x".format(eachByte) }

  val originalBytes = byteArrayOf(0x48, 0x65, 0x6C, 0x6C, 0x6F)
  println("目标数组内容：${originalBytes.joinToString { it.toString(16) }}")