Java 获取这周一，下周一，一段时间的连续日期

Java 获取这周一，下周一，一段时间的连续日期，日期是否是周末

关于日期类的处理，建议使用joda-time

<dependency>
  <groupId>joda-time</groupId>
  <artifactId>joda-time</artifactId>
  <version>2.10.10</version>
</dependency>

获取这周一的日期

public static Date getThisWeekMonday(Date date) {
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		// 获得当前日期是一个星期的第几天
		int dayWeek = cal.get(Calendar.DAY_OF_WEEK);
		if (1 == dayWeek) {
			cal.add(Calendar.DAY_OF_MONTH, -1);
		}
		// 设置一个星期的第一天，一个星期的第一天是星期一
		cal.setFirstDayOfWeek(Calendar.MONDAY);
		// 获得当前日期是一个星期的第几天
		int day = cal.get(Calendar.DAY_OF_WEEK);
		// 根据日历的规则，给当前日期减去星期几与一个星期第一天的差值
		cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);
		return cal.getTime();
	}	

获取下周一的日期

public static Date getNextWeekMonday(Date date) {
		Calendar cal = Calendar.getInstance();
		//先获取当前周周一的日期
		cal.setTime(getThisWeekMonday(date));
		//当前周一的时间加7天就是下周一
		cal.add(Calendar.DATE, 7);
		return cal.getTime();
	}

public static void main(String[] args) {
		System.out.println("这周一："+getThisWeekMonday(new Date()));
		System.out.println("下周一："+getNextWeekMonday(new Date()));
	}

判断日期是否是周末

public static boolean isWeekend(Date bDate) throws ParseException {
        Calendar cal = Calendar.getInstance();
        cal.setTime(bDate);
        if(cal.get(Calendar.DAY_OF_WEEK) == Calendar.SATURDAY || cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY){
            return true;
        } else{
            return false;
        }
	}

获取一段时间内的连续日期

public static List<String> getTwoDaysDay(String dateStart, String dateEnd) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		List<String> dateList = new ArrayList<String>();
		try{
			Date dateOne = sdf.parse(dateStart);
			Date dateTwo = sdf.parse(dateEnd);
			Calendar calendar = Calendar.getInstance();
			calendar.setTime(dateTwo);
			dateList.add(dateEnd);
			while(calendar.getTime().after(dateOne)){
				calendar.add(Calendar.DAY_OF_MONTH, -1);
				dateList.add(sdf.format(calendar.getTime()));
			}
		} catch(Exception e){
			e.printStackTrace();
		}
		return dateList;
	}