java 两个时间段中的日期和两个时间段中月份以及当前时间的前一周

向右看齐 2022-03-15 07:28 292阅读 0赞

/**
    	 * 将时间段转换成list集合
    	 * 
    	 * @param dBegin
    	 * @param dEnd
    	 * @return
    	 * @throws ParseException
    	 */
    	public static List<String> findDates(String dBegin, String dEnd) throws ParseException {
    		// 日期工具类准备
    		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    
    		// 设置开始时间
    		Calendar calBegin = Calendar.getInstance();
    		calBegin.setTime(format.parse(dBegin));
    
    		// 设置结束时间
    		Calendar calEnd = Calendar.getInstance();
    		calEnd.setTime(format.parse(dEnd));
    
    		// 装返回的日期集合容器
    		List<String> Datelist = new ArrayList<String>();
    
    		// 每次循环给calBegin日期加一天，直到calBegin.getTime()时间等于dEnd
    		while (format.parse(dEnd).after(calBegin.getTime())) {
    			// 根据日历的规则，为给定的日历字段添加或减去指定的时间量
    			calBegin.add(Calendar.DAY_OF_MONTH, 1);
    			Datelist.add(format.format(calBegin.getTime()));
    		}
    		Datelist.add(dBegin);
    		List<String> list = new ArrayList<String>();
    		// 将日期格式2019-01-21 转换成 20190121
    		for (int i = 0; i < Datelist.size(); i++) {
    			String date = Datelist.get(i);
    			String day = date.substring(0, 4) + date.substring(5, 7) + date.substring(8) + "";
    			list.add(day);
    		}
    		return list;
    	}
    
    	/**
    	 * 获取两个时间段中的月份 则不包含2019-07月份
    	 * 
    	 * @param startDate
    	 *            "2019-01-02"
    	 * @param endDate
    	 *            "2019-07-21"
    	 * @return
    	 * @throws ParseException
    	 */
    	public static List<String> getMonthBetween(String startDate, String endDate) throws ParseException {
    		ArrayList<String> result = new ArrayList<String>();
    		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");// 格式化为年月
    
    		Calendar min = Calendar.getInstance();
    		Calendar max = Calendar.getInstance();
    
    		min.setTime(sdf.parse(startDate));
    		min.set(min.get(Calendar.YEAR), min.get(Calendar.MONTH), 1);
    
    		max.setTime(sdf.parse(endDate));
    		max.set(max.get(Calendar.YEAR), max.get(Calendar.MONTH), 2);
    
    		Calendar curr = min;
    		while (curr.before(max)) {
    			result.add(sdf.format(curr.getTime()));
    			curr.add(Calendar.MONTH, 1);
    		}
    		// 将最后的月份删除
    		String format = endDate.subSequence(0, 7) + "";
    		if (result.contains(format)) {
    			result.remove(format);
    		}
    		return result;
    	}
    	/**
    	 * 获取当前时间的前一周的七天
    	 * 格式：20190121
    	 * @return
    	 */
    	public static List<String> getCurrentWeekDay() {
    		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar c = Calendar.getInstance();
    		List<String> Datelist = new ArrayList<String>();
    
    		c.setTime(new Date());
    
    		for (int i = 0; i < 7; i++) {
    			c.add(Calendar.DATE, -1);
    			Date d = c.getTime();
    			String day = format.format(d);
    			Datelist.add(day);
    		}
    
    		List<String> list = new ArrayList<String>();
    		// 将日期格式2019-01-21 转换成 20190121
    		for (int i = 0; i < Datelist.size(); i++) {
    			String date = Datelist.get(i);
    			String day = date.substring(0, 4) + date.substring(5, 7) + date.substring(8) + "";
    			list.add(day);
    		}
    		System.out.println("过去七天：" + list);
    		return list;
    	}