http 分页

page.scala

private def makePageResponse[T <: List[Any]](list: T, start: Int, max: Int, getNextUrl: Map[String, String] => String) = {
  var nextUrl: Option[String] = None
  var preUrl: Option[String] = None

  if (list.nonEmpty && list.size == max) {
    nextUrl = Some(getNextUrl(Map(
      "start" -> (start + max).toString,
      "max" -> max.toString
    )))
  }

  if (list.nonEmpty && start > 0) {
    preUrl = Some(getNextUrl(Map(
      "start" -> (start - max).max(0).toString,
      "max" -> max.toString
    )))
  }

  Response.build(list, nextUrl, preUrl)
}

private final val URL =""
private nextUrl(map:Map[String,String])=Uri(URL).withQuery(Query(map)).toString()