Java获取n个工作日前的日期

	public static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
	
	public static SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");

	private static List<String> legalHoliday = new ArrayList<>();
	

	static {
		legalHoliday.add("2021-01-01");
		legalHoliday.add("2021-02-11");
		legalHoliday.add("2021-02-12");
		legalHoliday.add("2021-02-15");
		legalHoliday.add("2021-02-16");
		legalHoliday.add("2021-02-17");
		legalHoliday.add("2021-04-05");
		legalHoliday.add("2021-05-03");
		legalHoliday.add("2021-05-04");
		legalHoliday.add("2021-05-05");
		legalHoliday.add("2021-06-14");
		legalHoliday.add("2021-09-20");
		legalHoliday.add("2021-09-21");
		legalHoliday.add("2021-10-01");
		legalHoliday.add("2021-10-04");
		legalHoliday.add("2021-10-05");
		legalHoliday.add("2021-10-06");
		legalHoliday.add("2021-10-07");
	}

	public static boolean isHoliday(Date time){
		String d = sdf2.format(time);
		return legalHoliday.contains(d);
	}
	
	
	
	public static String getWorkDay13() {
		Calendar c = Calendar.getInstance();
		
		c.setTime(new Date());
		int count = 0;
		while(count < 14) {
			Date d = c.getTime();
			int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
			if(dayOfWeek == 1 || dayOfWeek == 7 || isHoliday(d)) {
				
			}else {
				count++;
			}
			
			if(count < 14) {
				c.add(Calendar.DAY_OF_MONTH, -1);
			}
			
		}
		return sdf2.format(c.getTime());
	}

	public static void main(String[] args) throws Exception {
		System.out.println(getWorkDay13());
	}