生成时间区间中工作日开始(周一)-结束(周五)日期对的方法

/**
	 * 生成工作日开始(周一)-结束(周五)日期对的方法
	 * 例如：
	 * 输入：参数start_time ="2011-05-04"（星期三），end_time="2011-07-14"（星期四）
	 * 返回：[
	 * 			["2011-05-04","2011-05-06"],
	 * 			["2011-05-09","2011-05-13"],
	 * 			 ...,
	 * 			["2011-07-4","2011-07-14"]
	 * 	   ]
	 * 说明：返回的List中的第一个元素数组中，第1个值是开始日期，第2个值是开始日期后一个星期5
	 * 	   List中的最后一个元素数组中，第1个值是结束日期前一个星期1，第2个值是结束日期
	 *     List中间部分每一个元素数组中，第1个值是星期1，第2个值是星期5
	 * @param start_time
	 * @param end_time
	 * @return
	 */
	private List<String[]> getTimeWeeklyPairList(String start_time,String end_time){
		List<String[]> list = new ArrayList<String[]>();
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		Date start_date = null;
		Date end_date = null;
		
		try {
			start_date = sdf.parse(start_time);
			end_date = sdf.parse(end_time);
			int dayOfWeek1 = caculateWeekDays(start_date); //1->周日,2->周一
			int dayOfWeek2 = caculateWeekDays(end_date);
			int pre_days = 8 - dayOfWeek1; //i...saturday
			int last_days = dayOfWeek2; //sunday...i
			long diff_days = caculateDays(start_date,end_date);
			int remain_weeks = (int)(diff_days+2-pre_days-(last_days+1))/7;
			//计算第一个start、end对
			addPair(list,start_date,null,pre_days-2);
			
			//TODO添加
			for(int i=0; i<remain_weeks; i++){
				Date start_d = caculateDate(start_date, pre_days+i*7+1);
				addPair(list,start_d,null,4);
			}
			
			//计算最后一个start、end对
			addPair(list,null,end_date,-(last_days-2));
		} catch (ParseException e) {
			e.printStackTrace();
		}
		
		return list;
	}
	
	private void addPair(List<String[]> list, Date start_date, Date end_date, int days) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		Calendar c = Calendar.getInstance();
		
		String[] start_end_pair = new String[2];
		if(start_date!=null && end_date==null){
			c.setTime(start_date);
			c.add(Calendar.DAY_OF_MONTH, days);
			Date d = c.getTime();
			start_end_pair[0] = sdf.format(start_date);
			start_end_pair[1] = sdf.format(d);
		}else if(start_date==null && end_date!=null){
			c.setTime(end_date);
			c.add(Calendar.DAY_OF_MONTH, days);
			Date d = c.getTime();
			start_end_pair[0] = sdf.format(d);
			start_end_pair[1] = sdf.format(end_date);
		}
		list.add(start_end_pair);
	}
	
	public Date caculateDate(Date start_date, int days){
		Calendar c = Calendar.getInstance();
		c.setTime(start_date);
		c.add(Calendar.DAY_OF_MONTH, days);
		return c.getTime();
	}
	
	private int caculateWeekDays(Date date){
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		return c.get(Calendar.DAY_OF_WEEK);
	}
	
	private int caculateDays(Date start_date, Date end_date){
		return Math.round(end_date.getTime()/(1000*60*60*24)-start_date.getTime()/(1000*60*60*24));
	}