Map <=> Object & JSON String <=> Object(or List)

- 필드명은 같지만 클래스가 다른 객체 복사
ObjectCopyTools 참조
https://stackoverflow.com/questions/5937567/copy-pojo-content-from-one-bean-to-another


- Map <=> Object
https://yjkim97.tistory.com/m/9

[JAVA] Map to Object, Object to Map

- RefelectionUtil
https://yjkim97.tistory.com/m/19

[JAVA] ReflectionUtil

SampleVO object = new SampleVO();
java beans.BeanInfo beanInfo = java.beans.Introspector.getBeanInfo(object.getClass());
java.beans.PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();

for(PropertyDescriptor pd : pds) {
    Class<?> classType = pd.getPropertyType();
    Method getMethod = pd.gerReadMethod();  // get method
    Methid setMethod = pd.getWriteMethod(); // set method
}

- org.apache.commin.beanutils.PropertyUtils
java.beans.PropertyDescriptor[] pds = PropertyUtils.getPropertyDescriptors(클래스타입);

- org.springframework.beans.BeanUtils
org.springframework.beans.BeanUtils.getPropertyDescriptors(클래스타입);

- JSON String <=> List<E>
https://stackoverflow.com/questions/44589381/how-to-convert-json-string-into-list-of-java-object

How to convert JSON string into List of Java object?

final ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mapper.registerModule(new JavaTimeModule());
mapper.registerModule(new Jdk8Module());

CollectionType listType = mapper.getTypeFactory().constructCollectionType(List.class, SampleVO);
List<SampleVO> list = mapper.readValue(jsonStr, listType);

readValue(json, new TypeReference<List<Map>>(){});


https://mkyong.com/java/jackson-convert-json-array-string-to-list/

Jackson - Convert JSON array string to List - Mkyong.com

https://unlimitedcoding.tistory.com/m/14

[JAVA] json String to List map

- Ignore NULL Fields
https://www.baeldung.com/jackson-ignore-null-fields

Ignore Null Fields with Jackson | Baeldung

- jackson 설명
https://umbum.dev/880

[Java] Jackson ObjectMapper Serialization

- @JsonProperty, @JsonIgnore
https://stackoverflow.com/questions/60185183/how-to-ignore-jsonproperty-while-converting-object-to-map-by-jackson

How to ignore @JsonProperty while converting object to map by Jackson

- @JsonFilter를 이용한 조건에 맞는 필드만 json변환
https://jsonobject.tistory.com/258

Jackson, 커스텀 @JsonFilter로 조건에 맞는 필드만 JSON 변환하기

SimpleFilterProvider filterProvider = SimpleFilterProvider();
filterProvider.setFailOnUnknown(false);

filterProvider.addFilter("필터아이디", new SampleFliter());

ObjectMapper mapper = new ObjectMapper();
mapper.setFilterProvider(filterProvider);

- responseBody 를 이용한 json 변환시 default filter 적용시키기
https://stackoverflow.com/questions/31029370/how-to-registrer-custom-jackson-filter-in-spring-application/31056284#31056284

How to registrer custom jackson filter in spring application?

SimpleFilterProvider filterProvider = SimpleFilterProvider();
filterProvider.setFailOnUnknown(false);

ObjectMapper mapper = new ObjectMapper();
mapper.setFilterProvider(filterProvider);

- Map의 entrySet, keySet
https://tychejin.tistory.com/31

[Java] Map 전체 출력(entrySet, keySet, Iterator, Lambda, Stream)