如何使用kotlin中的嵌套字段序列化/反序列化json？

plugins {
    kotlin("jvm") version "1.5.31"
    kotlin("plugin.serialization") version "1.5.31"
}

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.0")
}

import kotlinx.serialization.Serializable
import kotlinx.serialization.decodeFromString
import kotlinx.serialization.encodeToString
import kotlinx.serialization.json.Json

@Serializable
data class User(
    val name: String,
    val age: Int,
    val address: Address
)

@Serializable
data class Address(
    val city: String,
    val street: String
)

fun main() {
    val user = User(
        name = "John Doe",
        age = 30,
        address = Address(city = "New York", street = "Broadway")
    )

    // 序列化
    val json = Json.encodeToString(user)
    println("Serialized JSON: $json")

    // 反序列化
    val deserializedUser = Json.decodeFromString<User>(json)
    println("Deserialized User: $deserializedUser")
}

val json = Json {
    ignoreUnknownKeys = true
}