关于时间戳格式标准化，封装成工具类，直接调用即可。

public class JsonUtils {
    public static String getJson(Object object){
        return getJson(object,"yyyy-MM-dd HH:mm:ss");

    }
    public static String getJson(Object obiect,String dateFormat){
        ObjectMapper mapper = new ObjectMapper();
        //让他不返回时间戳，关闭时间戳功能
        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,false);
        //时间格式化
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(dateFormat);
        //mapper指定时间格式为simpleDateFormat
        mapper.setDateFormat(simpleDateFormat);
        try {
            return mapper.writeValueAsString(obiect);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return null;
    }
    //封装一个工具类；调用时
    //return JsonUtils.getJson(new Date());

}