Jackson: Using JSON to convert values into keys

In Jackson, typically we define getters and setters in a class to print it as a JSON object. For example:

public class MyClass
{
    private Integer a;
    private Integer b;

    public myClass(Integer a, Integer b)
    {
        this.a = a;
        this.b = b;
    }

    @JsonProperty
    public Integer getA()
    {
        return a;
    }

    @JsonProperty
    public Integer getB()
    {
        return b;
    }

    public void setA(Integer a)
    {
        this.a = a;
    }

    public void setB(Integer b)
    {
        this.b = b;
    }

}

This setup would generate the output {"a":1,"b":2}.

Is there a way to change the output to {1:2} instead?

Answer №1

To accomplish this goal, it is essential to create custom code and then adjust accordingly. The output displayed appears to be in a standard JSON format that cannot be directly modified, but can be transformed using code.

Answer №2

If you're willing to overlook the fact that the output JSON is not valid, one option is to create a custom serializer for your POJO class. Here's an example implementation:

class MyCustomJsonSerializer extends JsonSerializer<MyClass> {
    @Override
    public void serialize(MyClass myClass, JsonGenerator generator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
        generator.writeStartObject();

        generator.writeRaw(myClass.getA() + ":" + myClass.getB());

        generator.writeEndObject();
    }
}

To use this custom serializer, annotate your MyClass with the following:

@JsonSerialize(using = MyCustomJsonSerializer.class)
class MyClass {
....
}

With this setup, your POJO should now be serialized according to your desired output.

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