string을 VO로 변환, json을 VO로 변환

convert string into VO
//stringData  = JSON.stringify({key:value}); 
private static ObjectMapper mapper = new ObjectMapper(); 
mapper.readValue(StringData, VO.class);

convert json into VO 
Gson gons = new Gson();
VO = gson.fromJson(jsonData.toString(), VO.class);