Collection的自定义序列化 <T> 使用杰克逊

Question

I'd like to convert a java collection like this

public Collection<SomeDTO> getPages()
{
    return pages;
}

to a json array like this:

pages: [{DTO}, {DTO}, {DTO}]

This works out of the box, but I'd now like to not use the default serialization for the SomeDTO . Specifically, I'd like to write out an object that includes a combination of the values and some additional calculations based on the SomeDTO .

I tried using the @JsonSerialize(using=Serializer) but when this is applied onto the Collection Method, it excpects me to serialize the collection myself. It's doable, but I woudl prefer to simply define how JUST the DTOs are serialized.

Ideas?

Answer 1

This might not help immediately, but the problem with @JsonSerialize is that unlike @JsonDeserialize which has both "using" (for type itself, like ArrayList) and "contentUsing" (for value type); @JsonSerialize does not have latter until Jackson 1.8 (it does exist in trunk).

But you can register custom serializer for type SomeDTO if you want, and that will be used when serializing collections that have them as value types. There are multiple ways to register such custom serializers; one is to just add @JsonSerializer(using=...) to declaration of SomeDTO. And if you can not add it to class definition (third-party class), you can use mix-in annotations to associate annotations.

Answer 2

您是否考虑过将getter添加到SomeDto以获取要序列化的其他字段？