SimpleXML 转换器的问题 - PersistenceException

Posted 2023-04-19

【中文标题】SimpleXML 转换器的问题 - PersistenceException

【英文标题】：Problem with SimpleXML Converter - PersistenceException

【发布时间】：2021-12-03 06:34:59

【问题描述】：

我尝试使用 XML SimpleXML Converter 解析从 https://www.w3schools.com/xml/simple.xml 获得的 xml，但出现异常

org.simpleframework.xml.core.PersistenceException：构造函数与类 com.example.nbrbcurrency.retrofit.models.Food 不匹配

我的 POJO 的

import org.simpleframework.xml.ElementList
import org.simpleframework.xml.Root

@Root(strict = false, name = "breakfast_menu")
data class BreakFastMenu @JvmOverloads constructor(
    @field:ElementList(inline = true)
    var foodList : List<Food>
)

和

import org.simpleframework.xml.Element
import org.simpleframework.xml.Root

@Root(name = "food")
data class Food @JvmOverloads constructor(
    @field:Element(name = "name")
    var name: String,

    @field:Element(name = "price")
    var price: String,

    @field:Element(name = "description")
    var description: String,

    @field:Element(name = "calories")
    var calories: String)

xml

<breakfast_menu>
<food>
<name>Belgian Waffles</name>
<price>$5.95</price>
<description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
<calories>650</calories>
</food>
<food>
<name>Strawberry Belgian Waffles</name>
<price>$7.95</price>
<description>Light Belgian waffles covered with strawberries and whipped cream</description>
<calories>900</calories>
</food>
<food>
<name>Berry-Berry Belgian Waffles</name>
<price>$8.95</price>
<description>Light Belgian waffles covered with an assortment of fresh berries and whipped cream</description>
<calories>900</calories>
</food>
<food>
<name>French Toast</name>
<price>$4.50</price>
<description>Thick slices made from our homemade sourdough bread</description>
<calories>600</calories>
</food>
<food>
<name>Homestyle Breakfast</name>
<price>$6.95</price>
<description>Two eggs, bacon or sausage, toast, and our ever-popular hash browns</description>
<calories>950</calories>
</food>
</breakfast_menu>

【参考方案1】：

我自己解决了。我只是预定义了属性。

import org.simpleframework.xml.Attribute
import org.simpleframework.xml.ElementList
import org.simpleframework.xml.Root

@Root(strict = false, name = "DailyExRates")
data class CurrencyDataList constructor(
    @field:Attribute(name = "Date")
    var date: String = "",
    @field:ElementList(inline = true)
    var currencies: List<CurrencyData> = ArrayList()
)