/**
 * 计算目标日期指定时间
 * @param date 目标日期
 * @param amount 相隔天数
 * @return Date
 */
public static Date getWeek(Date date, Integer amount) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.DATE, amount);
    return calendar.getTime();
}