Question

我有以下简单的代码

val fileLine = s"""{"AP_details":   [{"MAC_Address":    "00:11:74:00:00:00"},{"MAC_Address":    "00:11:74:00:00:00"},{"MAC_Address":    "00:11:74:00:00:00"}]}
    """  
  val jsonAst = fileLine.parseJson
  import APDetailsJsonProtocol._
  jsonAst.convertTo[APDetails]

转换在另一个文件中定义为

包裹测试 import spray.json._ import DefaultJsonProtocol._

case class APDetails(val mAPRadioOperatingParams:List[APDetail])
case class APDetail(val mac_id:String)

object APDetailsJsonProtocol extends DefaultJsonProtocol {
  implicit val APDetailFormat = jsonFormat1(APDetail)
  implicit object APDetailsJsonFormat extends RootJsonFormat[APDetails] {    
    def write(c: APDetails) = ??? 
    def read(value: JsValue) = value.asJsObject.getFields("AP_Details") match 
    {            
      case Seq(jsv ) => new APDetails(jsv.convertTo[List[APDetail]])              
    }
  }
}

但是我得到以下异常

Exception in thread "main" scala.MatchError: Vector() (of class scala.collection.immutable.Vector)
    at test.APDetailsJsonProtocol$APDetailsJsonFormat$.read(APDetails.scala:13)
    at test.APDetailsJsonProtocol$APDetailsJsonFormat$.read(APDetails.scala:11)
    at spray.json.JsValue.convertTo(JsValue.scala:31)
    at test.bootStrap.<init>(bootStrap.scala:25)
    at test.TestApp$.delayedEndpoint$test$TestApp$1(TestApp.scala:10)
    at test.TestApp$delayedInit$body.apply(TestApp.scala:4)
    at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
    at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
    at scala.App$$anonfun$main$1.apply(App.scala:76)
    at scala.App$$anonfun$main$1.apply(App.scala:76)
    at scala.collection.immutable.List.foreach(List.scala:381)
    at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
    at scala.App$class.main(App.scala:76)
    at test.TestApp$.main(TestApp.scala:4)
    at test.TestApp.main(TestApp.scala)

我做错了什么？最好的祝福，维沙尔

尝试转换Json字符串时出现matcherror异常

0 个答案: