[scala] jackson, ujson

scala 에서 json을 사용할 때 jackson을 바인딩하는 것다..

import java.util.TimeZone

import com.fasterxml.jackson.databind.{DeserializationFeature, ObjectMapper}
import com.fasterxml.jackson.databind.util.StdDateFormat
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import com.fasterxml.jackson.module.scala.experimental.ScalaObjectMapper

object JasksonJsonUtil {
  val mapper = new ObjectMapper() with ScalaObjectMapper
  mapper.registerModule(DefaultScalaModule)
  mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)

  val stdDateFormat = new StdDateFormat()
  stdDateFormat.setTimeZone(TimeZone.getDefault)
  mapper.setDateFormat(stdDateFormat)

  def toJson(value: Object): String = {
    mapper.writeValueAsString(value)
  }
}

ujson이 좀 나은 것 같다.  

ujson에서는 scala 계에서 유명한 lihaoyi 라이브러리(com.lihaoyi:ujson)를 활용한다.

import org.scalatest.{FunSuite, Matchers}
import java.text.SimpleDateFormat
import java.util.Date

import ujson.Value

class JasksonJsonUtilTest extends FunSuite with Matchers {
  test("JacksonJsonUtil.toJson") {
    case class Model(name: String, date: Date)
    val actual       = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ")
                          .parse("2019-10-04T10:14:27.783+0900")
    val json: String = JasksonJsonUtil.toJson(Model("expire", actual))
    UJson(json).get("date").str should be("2019-10-04T10:14:27.783+0900")
  }

  case class UJson(jsonString: String) {
    val value: Value = ujson.read(jsonString)

    def get(keys: String): Value.Value = {
      var x = value
      keys.split("[.]").foreach { key =>
        x = x(key)
      }
      x
    }
  }
}