【HTML5入门】java获取util date类型当前系统前一天，当天，后天日期

String nowDate = df.format(now.getTime()); // nowDate是string类型
Date nowdate = null;// 获得一个util date格式date
nowdate = df.parse(nowDate);// string向util转换
//nowdate为当前系统util类型时间

java.sql.Date sqlDate = new java.sql.Date(nowdate.getTime());// utile向sqldate转换

public static Date getNextDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_MONTH, -1);
date = calendar.getTime();
return date;
}

public static Date getNextDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_MONTH, 0);
date = calendar.getTime();
return date;
}

public static Date getNextDay(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_MONTH, 1);
date = calendar.getTime();
return date;
}