JSONObject转换为Map＜String, String＞对象「建议收藏」

JSONObject obj = new JSONObject();
{
obj.put("key1", "value1");
obj.put("key2", "value2");
obj.put("key3", "value3");
}
Map<String, String> params = JSONObject.parseObject(obj.toJSONString(), new TypeReference<Map<String, String>>(){});

public static Map<String,Object> JsonToMap(JSONObject j){

    Map<String,Object> map = new HashMap<>();

    Iterator<String> iterator = j.keys();

    while(iterator.hasNext()){

        String key = (String)iterator.next();

        Object value = j.get(key);

        map.put(key, value);

    }

    return map;

}