把Date类型的数据加一天

Date date = new Date();

Calendar cal = Calendar.getInstance();

cal.setTime(day);
    cal.set(Calendar.HOUR_OF_DAY, 0);

cal.set(Calendar.MINUTE, 0);

cal.set(Calendar.SECOND, 0); //设置时分秒都为0
    day = cal.getTime();       //day为2008-08-03 00:00:00
    cal.add(Calendar.DAY_OF_YEAR, 1);  //小时加1
    Date d2 = cal.getTime();   //d2为2008-08-04 00:00:00