play的Json测试

上代码

import play.api.libs.json.{Json, JsValue, Writes}

/**
 * Created by DGA on 2016/3/31.
 */
case class Bar(x:String,y:Int) {}
object Bar{
  implicit val implicitBarWrites = new Writes[Bar]{
    override def writes(testJson: Bar): JsValue = {
      Json.obj(
          "x" -> testJson.x,
          "y" -> testJson.y
      )
    }
  }
}

case class Foo(id: String, bar: Bar)


object TestJson{
  implicit val fooWrites = Json.writes[Foo]

  def main(args: Array[String]) {
    println(
      Json.prettyPrint(Json.toJson(Bar("x",1)))
    )
    println(
      Json.prettyPrint(Json.toJson(Foo("foo",Bar("x",1))))
    )

  }

}

测试结果

{
  "x" : "x",
  "y" : 1
}
{
  "id" : "foo",
  "bar" : {
    "x" : "x",
    "y" : 1
  }
}

隐式转换 将对象转换为json格式的字符串， Json.writes用起来更简洁