Jackson Series Analyzer for Primitive Types

Question

I am writing a special serializer to convert double values ​​to strings in JSON objects. My code is:

public String toJson(Object obj) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    SimpleModule module = new SimpleModule("DoubleSerializer", new Version(1, 0, 0, ""));

    module.addSerializer(Double.class, new DoubleSerializer());
    mapper.registerModule(module);
    return mapper.writeValueAsString(obj);
}

public class DoubleSerializer extends JsonSerializer<Double> {
    @Override
    public void serialize(Double value, JsonGenerator jgen,
            SerializerProvider provider) throws IOException,
            JsonProcessingException {
        String realString = new BigDecimal(value).toPlainString();
        jgen.writeString(realString);
    }
}

This works fine with Double (class members), but does not work for elements with a double (primitive type). For instance,

    public void test() throws IOException {
        JsonMaker pr = new JsonMaker();
        TestClass cl = new TestClass();

        System.out.println(pr.toJson(cl));

    }

    class TestClass {
        public Double x;
        public double y;
        public TestClass() {
            x = y = 1111142143543543534645145325d;
        }
    }

Refunds: {"x": "1111142143543543565865975808", "y": 1.1111421435435436E27}

Is there a way to get him to follow the same behavior for both cases?

Answer 1

You can register JsonSerializerfor a primitive type double.

module.addSerializer(double.class, new DoubleSerializer());

Answer 2

, . JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS:

mapper.getFactory().enable(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS);