json - Kotlin:来自Json的GSON无法计算

Question

我已成功接收到JSON对象作为请求并将其传递给解析器。代码一直运行到我从Json调用，然后卡住为止。我究竟做错了什么？

这是相应的类:

class User(@SerializedName("mac") private val phoneMac: String) : Comparable<User> {

    @SerializedName("values")
    private val measurements: MutableSet<Measurement> = mutableSetOf()

    fun getPhoneMac(): String = phoneMac
    fun getMeasurements(): Set<Measurement> = measurements

    //etc.
}

指的是此类:

class Measurement (@SerializedName("mac") val deviceMac: String, val timestamp: String, val value: Double, val valueType: ValueType) : Comparable<Measurement>{

    fun getDeviceMac(): String = deviceMac
    fun getTimestamp(): String = timestamp
    fun getValue(): Double = value
    fun getValueType(): ValueType = valueType

        //etc.
}

这是我尝试解析的方法:

fun fromJson(json: String): User {
    val builder = GsonBuilder()
    builder.setPrettyPrinting()

    return builder.create().fromJson(json, User::class.java)
}

是否已将fromJson函数展开以确保其卡在哪里:create()仍然有效，fromJson()不起作用

另外，我知道JSON文件是正确的，并且不包含缺失值或null。

进行验证:

{
"mac": "00-80-41-ae-fd-b1",
"values": 
[
    {
    "mac": "ab-cd-ef-98-76-13",
    "timestamp": "2012-04-23T18:25:43",
    "value": 68,
    "valuetype": "HR"
    },
    {
    "mac": "ab-cd-ef-98-76-13",
    "timestamp": "2012-04-23T18:35:43",
    "value": 65,
    "valuetype": "HR"
    }
]
}

编辑:澄清我的代码被卡住的意思
出于调试目的，我将fromJson函数更改为如下所示:

fun fromJson(json: String): User {
    val builder = GsonBuilder()
    builder.setPrettyPrinting()

    println("json received")
    val gson = builder.create()
    println("GSON created")
    val user = gson.fromJson(json, User::class.java)
    println("user created")

    return user
}

我的控制台显示

json received GSON created

表示未打印“用户创建”，因此gson.fromJson-call永不返回

Answer 1

不确定卡住是什么意思，但这似乎奏效:

import com.google.gson.*
import com.google.gson.annotations.*

data class User(@SerializedName("mac") val phoneMac: String, @SerializedName("values") val measurements: MutableSet<Measurement>)

enum class ValueType{
    HR
}

data class Measurement (@SerializedName("mac") val deviceMac: String, val timestamp: String, val value: Double, val valuetype: ValueType)

fun fromJson(json: String): User {
    val builder = GsonBuilder()
    builder.setPrettyPrinting()

    return builder.create().fromJson(json, User::class.java)
}

fun main() {
    println(fromJson("""
        {
        "mac": "00-80-41-ae-fd-b1",
        "values": 
        [
            {
            "mac": "ab-cd-ef-98-76-13",
            "timestamp": "2012-04-23T18:25:43",
            "value": 68,
            "valuetype": "HR"
            },
            {
            "mac": "ab-cd-ef-98-76-13",
            "timestamp": "2012-04-23T18:35:43",
            "value": 65,
            "valuetype": "HR"
            }
        ]
        }
    """.trimIndent()))
}