设置日期

public static Date getTime(Integer day, Integer hour, Integer minute, Integer second) {Calendar c = Calendar.getInstance();if (day != null)c.add(Calendar.DAY_OF_MONTH, day);if (hour != null)c.set(Calendar.HOUR_OF_DAY, hour);if (minute != null)c.set(Calendar.MINUTE, minute);if (second != null)c.set(Calendar.SECOND, second);return c.getTime();}//随手记录