Jackson禁用@JsonFormat注释

Question

我正在使用jackson库，我遇到了一种情况，我想在序列化/反序列化时使用对象映射器禁用@JsonFormat注释。

我的Api代码在第三方库中，所以我不能删除/添加任何注释，所以objectMapper是唯一的选择。

Api类别:

public class ApiClass {

  @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'")
  private DateTime time;

}

我的代码：

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
objectMapper.configure(Feature.ALLOW_COMMENTS, true);
objectMapper.configure(MapperFeature.AUTO_DETECT_IS_GETTERS, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
objectMapper.setSerializationInclusion(Include.NON_ABSENT);
objectMapper.registerModule(new JodaModule());
objectMapper.registerModule(new JavaTimeModule());

String str = " {\"time\": \"2012-05-01\"}";

ApiClass msg = objectMapper.readValue(str, ApiClass.class);

我希望这种转换成功发生。

目前我得到了：com.fasterxml.jackson.databind。JsonMappingException:格式无效：“2012-05-01”太短

请在这里帮助我。

预先感谢

Answer 1

尝试使用自定义反序列化程序：

public class MyTest {
    @Test
    public void myTest() throws IOException {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        objectMapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
        objectMapper.configure(MapperFeature.AUTO_DETECT_IS_GETTERS, true);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_ABSENT);
        objectMapper.registerModule(new JavaTimeModule());

        String str = " {\"time\": \"2012-05-01\"}";


        SimpleModule module = new SimpleModule();
        module.addDeserializer(DateTime.class, new DateTimeDeserializer());
        objectMapper.registerModule(module);


        ApiClass msg = objectMapper.readValue(str, ApiClass.class);
        System.out.println(msg.getTime());
    }
}

class ApiClass {

    @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss'Z'")
    private DateTime time;

    public DateTime getTime() {
        return time;
    }

    public void setTime(DateTime time) {
        this.time = time;
    }
}

class DateTimeDeserializer extends StdDeserializer<DateTime> {

    public DateTimeDeserializer() {
        this(null);
    }

    public DateTimeDeserializer(Class<?> vc) {
        super(vc);
    }

    @Override
    public DateTime deserialize(JsonParser jp, DeserializationContext ctxt)
        throws IOException {
        JsonNode node = jp.getCodec().readTree(jp);
        String time = node.asText();
        return new DateTime(time);
    }
}

Answer 2

在使用readValue方法之前，请尝试下面的代码

mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"));

Answer 3

下面是专门禁用JsonFormat的代码:

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
objectMapper.configure(Feature.ALLOW_COMMENTS, true);
objectMapper.configure(MapperFeature.AUTO_DETECT_IS_GETTERS, true);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
objectMapper.setSerializationInclusion(Include.NON_ABSENT);
objectMapper.registerModule(new JodaModule());
objectMapper.registerModule(new JavaTimeModule());

objectMapper.setAnnotationIntrospector(new JacksonAnnotationIntrospector() {
    @Override
    protected <A extends Annotation> A _findAnnotation(final Annotated annotated,
        final Class<A> annoClass) {
      if (!annotated.hasAnnotation(JsonFormat.class)) {    //since we need to disable JsonFormat annotation.
        return super._findAnnotation(annotated, annoClass);
      }
      return null;
    }
  });


String str = " {\"time\": \"2012-05-01\"}";

ApiClass msg = objectMapper.readValue(str, ApiClass.class);
System.out.println(objectMapper.writeValueAsString(msg ));

如果我们需要禁用多个注释(JsonFormat，JsonUnWrapped ),那么:

替换：

if (!annotated.hasAnnotation(JsonFormat.class)) {

与：

if (!annotated.hasOneOf(new Class[] {JsonFormat.class, JsonUnwrapped.class})) {

谢谢大家。