1 /* 2 * Copyright 2017-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license. 3 */ 4 5 package kotlinx.serialization 6 7 import kotlinx.serialization.descriptors.* 8 import kotlinx.serialization.encoding.* 9 import kotlinx.serialization.json.Json 10 import org.junit.Test 11 import java.text.DateFormat 12 import java.text.SimpleDateFormat 13 import java.util.* 14 import kotlin.test.assertEquals 15 16 object DateSerializer : KSerializer<Date> { 17 override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("java.util.Date", PrimitiveKind.STRING) 18 19 // Consider wrapping in ThreadLocal if serialization may happen in multiple threads <lambda>null20 private val df: DateFormat = SimpleDateFormat("dd/MM/yyyy HH:mm:ss.SSS").apply { 21 timeZone = TimeZone.getTimeZone("GMT+2") 22 } 23 serializenull24 override fun serialize(encoder: Encoder, value: Date) { 25 encoder.encodeString(df.format(value)) 26 } 27 deserializenull28 override fun deserialize(decoder: Decoder): Date { 29 return df.parse(decoder.decodeString()) 30 } 31 } 32 33 @Serializable 34 data class ClassWithDate(@Serializable(with = DateSerializer::class) val date: Date) 35 36 class SerializeJavaClassTest { 37 @Test serializeToStringAndRestorenull38 fun serializeToStringAndRestore() { 39 // Thursday, 4 October 2018 09:00:00 GMT+02:00 — KotlinConf 2018 Keynote 40 val date = ClassWithDate(Date(1538636400000L)) 41 val s = Json.encodeToString(date) 42 assertEquals("""{"date":"04/10/2018 09:00:00.000"}""", s) 43 val date2 = Json.decodeFromString(ClassWithDate.serializer(), s) 44 assertEquals(date, date2) 45 } 46 } 47