import org.json4s.{Formats, NoTypeHints}
import org.json4s.jackson.Serialization
import org.json4s.jackson.Serialization.writeobject Json4sDemo {// 需要添加隐式转换implicit val formats: AnyRef with Formats = Serialization.formats(NoTypeHints)def main(args: Array[String]): Unit = {val user1 = User(1, name = "李明", 12)val user2 = User(2, name = "张杰", 43)val user3 = User(3, name = "王伟", 54)val user4 = User(4, name = "刘安", 24)val users = List[User](user1, user2, user3, user4)// 由scala 对象转换为 Json字符串val str = write(user1)println(str)val sts = write(users)println(sts)}case class User(id: Int, name: String, age: Int)
}