代码片段如下

/**     * 获取x天前的日期     */    private static String getDay(int day){        String dayTmp = "";        Date dateNow = new Date();        //获取日历        Calendar calendar = Calendar.getInstance();        calendar.setTime(dateNow);        calendar.add(Calendar.DAY_OF_MONTH,-day);        Date dateBefore=calendar.getTime();        //转换格式        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");        String beforeDay = df.format(dateBefore);        //赋值        dayTmp = beforeDay;        System.out.println("前day天时间:"+dayTmp);        return dayTmp;    }