如何忽略ObjectMapper中的@JsonIgnoreProperties

Question

我的 Java 应用程序中有以下类：

@JsonIgnoreProperties(value = {"myProperty"}, allowSetters = true)
public class Test {

    private String myProperty;

// getter and setter 
}

我想用 ObjectMapper 将此对象转换为 json，但“myProperty”不转换，我想忽略该注释（@JsonIgnoreProperties），但请记住我仍想使用另一个注释。 在提出问题之前，我尝试修复它并分别为我的对象映射器定义一种自定义 Introspector 和 setAnnotationIntrospector 并对其进行测试，但问题未解决：

public class TestCustomIntrospector1 extends JacksonAnnotationIntrospector {

    @Override
    public PropertyName findNameForSerialization(Annotated a) {
        if (a.getAnnotated().equals(JsonIgnoreProperties.class)) {
            return null;
        }
        return super.findNameForSerialization(a);
    }
}

public class TestMain  {

    public static void main(String[] args) {
        Test obj = new Test();
        obj.setMyProperty("this is for test");
        try {
            String json = new ObjectMapper()
                    .setAnnotationIntrospector(new TestCustomIntrospector1())
                    .writerWithDefaultPrettyPrinter().writeValueAsString(obj);
            System.out.println(json);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

另一个内省者：

public class TestCustomIntrospector2 extends JacksonAnnotationIntrospector {

    @Override
    public boolean isAnnotationBundle(Annotation ann) {
        if (ann.annotationType() == JsonIgnoreProperties.class) {
            return false;
        }
        return super.isAnnotationBundle(ann);
    }

    @Override
    public boolean hasIgnoreMarker(AnnotatedMember m) {
        JsonIgnoreProperties ignoreProperties = m.getAnnotation(JsonIgnoreProperties.class);
        if (ignoreProperties != null) {
            return ignoreProperties.ignoreUnknown();
        }
        return super.hasIgnoreMarker(m);
    }
}

public class TestMain  {

    public static void main(String[] args) {
        Test obj = new Test();
        obj.setMyProperty("this is for test");
        try {
            String json = new ObjectMapper()
                    .setAnnotationIntrospector(new TestCustomIntrospector2())
                    .writerWithDefaultPrettyPrinter().writeValueAsString(obj);
            System.out.println(json);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

我想要以下结果：

{
  "myProperty": "this is for test"
}

有人可以帮助我吗？

Answer 1

测试自定义内省器2：

public class TestCustomIntrospector2 extends JacksonAnnotationIntrospector {

        @Override
        public JsonIgnoreProperties.Value findPropertyIgnoralByName(MapperConfig<?> config, Annotated a){
            return JsonIgnoreProperties.Value.empty();
        }
}