杰克逊列表反序列化。嵌套列表 [英] Jackson list deserialization. nested Lists
问题描述
我正在创建一个包含嵌套列表的API。杰克逊似乎是一个创建对象的好工具,但我无法弄清楚如何嵌套列表,我想知道它是否可行。
I'm working on creating an API that has nested lists. Jackson seems like a great tool to create objects, but I can't quite figure out how to nest a list, and I'm wondering if its possible.
我的对象看起来像这样。
My object looks like this.
public class Order {
public String name;
public List<Item> items;
}
我希望有办法将它映射到json看起来像什么喜欢:
I'm hoping there is a way to map it to json that looks something like:
{
name : "A name"
items : {
elements : [{
price : 30
}]
}
}
我们希望能够这样做,以便我们可以向列表添加属性。
We want to be able to do this so we can add properties to lists.
推荐答案
您可以为 List< Item>编写自定义反序列化器项目
。见下面的例子:
You can write custom deserializer for List<Item> items
. See below example:
class ItemsJsonDeserializer extends JsonDeserializer<List<Item>> {
@Override
public List<Item> deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
InnerItems innerItems = jp.readValueAs(InnerItems.class);
return innerItems.elements;
}
private static class InnerItems {
public List<Item> elements;
}
}
现在,您必须通知杰克逊将其用于你的财产。你可以这样做:
Now, you have to inform Jackson to use it for your property. You can do this in this way:
public class Order {
public String name;
@JsonDeserialize(using = ItemsJsonDeserializer.class)
public List<Item> items;
}
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