URL上的QueryString,使用paramters directive解析
必传参数(Required parameter)
http://localhost/api?color=blue&backgroundColor=orange
val route = parameters('color, 'backgroundColor) { (color, backgroundColor) => complete(s"The color is '$color' and the background is '$backgroundColor'") }
可选参数(Optional parameter)
http://localhost/api?color=blue
val route = parameters('color, 'backgroundColor.?) { (color, backgroundColor) => val backgroundStr = backgroundColor.getOrElse("<undefined>") complete(s"The color is '$color' and the background is '$backgroundStr'") }
设置可选参数的默认值(Optional parameter with default value)
http://localhost/api?color=blue等同于http://localhost/api?color=blue&backgroundColor=white
val route = parameters('color, 'backgroundColor ? "white") { (color, backgroundColor) => complete(s"The color is '$color' and the background is '$backgroundColor'") }
限制参数的值(Parameter with required value)
Ok http://localhost/api?color=blue&action=true NotFound http://localhost/api?color=blue&action=false
val route = parameters('color, 'action ! "true") { (color) => complete(s"The color is '$color'.") }
//note: require value of parameter “color” to be "blue" and extract nothing
反序列化,将字符串转换为强类型(Deserialized parameter)
Ok http://localhsot/api?color=blue&count=42 BadRequest http://localhost/api?color=blue&count=blue val route = parameters('color, 'count.as[Int]) { (color, count) => complete(s"The color is '$color' and you have $count of it.") }