Jackson序列化器用于原始类型

Question

我正在编写一个自定义序列化程序,将双值转换为JSON对象中的字符串.我的代码到目前为止:

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);
    }
}

这适用于Double(类成员),但不适用于double(基本类型)成员.例如,

    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;
        }
    }

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

有没有办法让它在两种情况下遵循相同的行为？

Answer 1

您可以注册JsonSerializer原始类型double.

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