Date类的getYear(),getMonth过时，现在的获取方法

已知一个时间 Date businessDateTime 已知

Calendar cal = Calendar.getInstance();
cal.setTime(businessDateTime);
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH) + 1;

 获取当前月具有的天数：

Integer dayCount = LocalDate.now().withMonth(localDate.getMonthValue()).lengthOfMonth();