public static String toJson(Object value) {

try {

return mapper.writeValueAsString(value);

} catch (Exception e) {

e.printStackTrace();

}

return null;

}

public static <T> T toObject(String json, Class<T> valueType) {

Assert.hasText(json);

Assert.notNull(valueType);

try {

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

mapper.setDateFormat(dateFormat);

return mapper.readValue(json, valueType);

} catch (Exception e) {

e.printStackTrace();

}

return null;