JacksonSample.scala

package com.mycollab.billing.fastspring

import com.fasterxml.jackson.annotation.{JsonCreator, JsonProperty}
import com.fasterxml.jackson.core.{JsonGenerator, JsonParser}
import com.fasterxml.jackson.databind._
import com.fasterxml.jackson.databind.annotation.{JsonDeserialize, JsonSerialize}
import com.fasterxml.jackson.databind.module.SimpleModule
import org.joda.time.LocalDateTime
import org.joda.time.format.DateTimeFormat

import scala.beans.BeanProperty

object JacksonSample {
  def main(args: Array[String]): Unit = {
    val mapper = new ObjectMapper()
    //Serialize object to JSON
    val json = mapper.writeValueAsString(new Student("Nguyen", "Hai", Array(
      new Classroom("class 1", new LocalDateTime(2016, 1, 1, 9, 0)),
      new Classroom("class 2", new LocalDateTime(2016, 1, 1, 11, 0)))))
    Console.println("Json: " + json)

    //De-serialize JSON to object
    val person = mapper.readValue(json, classOf[Student])
  }
}

@JsonCreator
class Student(@JsonProperty("firstName") @BeanProperty val firstName: String,
              @JsonProperty("lastName") @BeanProperty val lastName: String,
              @JsonProperty("address") @BeanProperty val address: Array[Classroom]) {

}

@JsonCreator
@JsonSerialize(using = classOf[ClassroomSerializer])
@JsonDeserialize(using = classOf[ClassroomDeserializer])
class Classroom(@JsonProperty("name") @BeanProperty var name: String,
                @JsonProperty("time") @BeanProperty var time: LocalDateTime) {

}

class ClassroomSerializer extends JsonSerializer[Classroom] {
  private val formatter = DateTimeFormat.forPattern("dd-MMM-yyyy")

  override def serialize(value: Classroom, gen: JsonGenerator, serializers: SerializerProvider): Unit = {
    gen.writeStartObject
    gen.writeStringField("name", value.name)
    gen.writeStringField("time", formatter.print(value.time))
    gen.writeEndObject
  }
}

class ClassroomDeserializer extends JsonDeserializer[Classroom] {
  private val formatter = DateTimeFormat.forPattern("dd-MMM-yyyy")

  override def deserialize(p: JsonParser, ctxt: DeserializationContext): Classroom = {
    val node: JsonNode = p.getCodec.readTree(p)
    val classroom = new Classroom("", null)
    classroom.name = node.get("name").asText()
    classroom.time = LocalDateTime.parse(node.get("time").asText(), formatter)
    classroom
  }
}