[JAVA] Map 을 JSONObject로 변환,List<Map<String, Object>> 을 JSONArray로 변환

Map, List Map으로 작업하다가 json array 로 변환이 필요할때

Map 을 JSONObject로 변환,List<Map<String, Object>>  을 JSONArray로 변환

@SuppressWarnings({ "unchecked" })
public static JSONArray convertListToJson(List<Map<String, Object>> listMap) {

    JSONArray jsonArray = new JSONArray();
    for (Map<String, Object> map : listMap) {
        jsonArray.add(convertMapToJson(map));
    }
    return jsonArray;

}

@SuppressWarnings({ "unchecked" })
public static JSONObject convertMapToJson(Map<String, Object> map) {

    JSONObject json = new JSONObject();
    for (Map.Entry<String, Object> entry : map.entrySet()) {
        String key = entry.getKey();
        Object value = entry.getValue();
        json.put(key, value);

    }
    return json;
}

 

사용법

	Map<String, Object> myInfoMap = new  HashMap<String, Object>();
    myInfoMap.put("color", "black");
    myInfoMap.put("food", "pizza");
    myInfoMap.put("loc", "seoul");
    System.out.println(myInfoMap);

    Map<String, Object> myInfoMap2 = new  HashMap<String, Object>();
    myInfoMap2.put("id", "joy");
    myInfoMap2.put("name", "big");
    myInfoMap2.put("favorite", "vitamin");
    System.out.println(myInfoMap2);

    System.out.println("=============>>>==================");

    //map을 json 형태로 변환
    JSONObject myJson = Test.convertMapToJson(myInfoMap);
    JSONObject myJson2 = Test.convertMapToJson(myInfoMap2);
    System.out.println(myJson);
    System.out.println(myJson2);

    System.out.println("--------------------------------------------------------------------------------------");

    List<Map<String, Object>> listMap = new ArrayList<Map<String,Object>>();
    listMap.add(myInfoMap);
    listMap.add(myInfoMap2);
    System.out.println(listMap);

    JSONArray jsonArr = Test.convertListToJson(listMap);

    System.out.println("=============>>>==================");

    System.out.println(jsonArr);

 

결과

{loc=seoul, color=black, food=pizza}
{name=big, id=joy, favorite=vitamin}
=============>>>==================
{"loc":"seoul","color":"black","food":"pizza"}
{"name":"big","id":"joy","favorite":"vitamin"}
--------------------------------------------------------------------------------------
[{loc=seoul, color=black, food=pizza}, {name=big, id=joy, favorite=vitamin}]
=============>>>==================
[{"loc":"seoul","color":"black","food":"pizza"},{"name":"big","id":"joy","favorite":"vitamin"}]