对于多型值json4s可以添加具体类型作为附加字段。这就是所谓的“类型提示”:
[{
"jsonClass": "Adding",
"value": 10
}, {
"jsonClass": "Adding",
"value": 20
}, {
"jsonClass": "Removing",
"value": 20
}]
这是例如使用ShortTypeHints
:
import org.json4s.{ShortTypeHints, DefaultFormats}
import org.scalatra.ScalatraServlet
import org.scalatra.json.JacksonJsonSupport
import org.scalatra.test.specs2.MutableScalatraSpec
sealed trait Operation
case class Adding(value: Int) extends Operation
case class Removing(value: Int) extends Operation
class json1 extends MutableScalatraSpec {
mount(new ScalatraServlet with JacksonJsonSupport {
def typeHints = new ShortTypeHints(List(
classOf[Adding], classOf[Removing]
))
implicit lazy val jsonFormats = DefaultFormats + typeHints
before() {
contentType = formats("json")
}
get("/") {
List(
Adding(10),
Adding(20),
Removing(20)
)
}
}, "/*")
"Should return a list of operations" in {
get("/", headers = Seq("Content-type" -> "application/json")) {
println(body)
status should beEqualTo(200)
}
}
}
是否添加或删除有状态?你可以让它们成为案例对象吗? – ka4eli
他们是操作的案例类。 'case class添加扩展操作'。他们没有额外的状态参数。 – dmydlarz