[英]How to write custom property deserializers in jackson
I have a lot of different classes that have a property that needs custom deserialization. 我有很多不同的类,它们的属性需要自定义反序列化。
Example: 例:
data class Specific(val a: String, val b: String) // <-- Needs special deserialization
data class Foo(val value: String, val sp: Specific)
data class Bar(val something: Int, val sp: Specific)
I have tried creating a custom deserializer using the StdDeserializer
. 我尝试使用StdDeserializer
创建自定义解串器。 And this only works if I write the deserializer for the actual class ( Foo
and Bar
), but I only want to write one for the Specific
type. 而且这仅在我为实际的类( Foo
和Bar
)编写反序列化器时才有效,但是我只想为Specific
类型编写一个。
As I'm using Kotlin I would love the non java Annotated way to to it. 当我使用Kotlin时,我会喜欢使用非Java注释的方式。
With the ObjectMapper
that you're going to use to do the deserialization, first register a custom deserializer for the Specific
class. 使用要用于反序列化的ObjectMapper
,首先为Specific
类注册一个自定义反序列化器。 It will then use that when deserializing instances of this class, regardless of whether you're deserializing them directly, or as a property of some other object being deserialized. 然后,在反序列化此类的实例时,无论您是直接对其进行反序列化,还是作为其他要反序列化的对象的属性,都将使用该方法。
For example you could do something like this: 例如,您可以执行以下操作:
class SpecificDeserializer() : StdDeserializer<Specific>(Specific::class.java) {
override fun deserialize(p: JsonParser, ctxt: DeserializationContext): Specific {
// Deserialize
}
}
val mapper = jacksonObjectMapper()
mapper.registerModule(SimpleModule().also {
it.addDeserializer(Specific::class.java, SpecificDeserializer())
})
val foo = mapper.readValue<Foo>(...
This is explained here . 这在这里解释。 Note that for serialization the same approach can be taken. 注意,对于序列化,可以采用相同的方法。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.