[Java] mapToJson.java

public static String mapToJson(Map map, boolean isPretty) {
    ObjectMapper mapper = new ObjectMapper();

    try {
        return isPretty ?
                mapper.writerWithDefaultPrettyPrinter().writeValueAsString(map) :
                mapper.writeValueAsString(map);
    } catch (JsonProcessingException e) {
        return "";
    }
}

https://gist.github.com/seunggabi/5ee4fb66d86a8896f5f38837f3699654

mapToJson.java

https://4urdev.tistory.com/92

Jackson 라이브러리를 이용한 JSON String, Map 간 변환 (How to convert JSON String to Map and Map to JSON String)