import collection.mutable.Map

import scala.util.parsing.json._

def regJson(json:Option[Any]) = json match {

      //转换类型

      case Some(map:collection.immutable.Map[String, Any]) => map

}

def str_json(string_json:String):collection.immutable.Map[String,Any]=

{

    var first :collection.immutable.Map[String, Any] = collection.immutable.Map()

    val jsonS = JSON.parseFull(string_json)

    //不确定数据的类型时，此处加异常判断

    if (jsonS.isInstanceOf[Option[Any]]){

        first = regJson(jsonS)

    }

    first

    }

val jsonStr = """{"id":"1", "name":"jack","detail_info":{"age":"18","sex":"man"}}"""

val parse_str = str_json(jsonStr)

//parse_str: scala.collection.immutable.Map[String,Any] = Map(id -> 1, name -> jack, detail_info -> Map(age -> 18, sex -> man))

val id = parse_str("id")

//res7: Any = 1，此处为Any类型，一定要在使用前转换为原有类型，可以用asInstanceOf函数

val id_str = parse_str("id").toString

//res8: String = 1

val detail_info = parse_str("detail_info")

//res9: Any = Map(age -> 18, sex -> man)

//val parse_str("detail_info").asInstanceOf[Map[String, String]]

//提示错误：java.lang.ClassCastException: scala.collection.immutable.Map$Map2 cannot be cast to scala.collection.mutable.Map。注意Map类型

val parse_detail = parse_str("detail_info").asInstanceOf[scala.collection.immutable.Map[String,Any]]

//parse_detail: scala.collection.immutable.Map[String,Any] = Map(age -> 18, sex -> man)

val sex_str = parse_detail("sex").toString

//res14: String = man

val parse_detail = parse_str("detail_info").asInstanceOf[scala.collection.immutable.Map[String,Any]]