获取当前日期上一周开始时间、结束时间和年份

private Map<String, Object> getParams(String dateStr)
    {
        Map<String, Object> map = new HashMap<String, Object>();
        SimpleDateFormat sbf = new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat sbf1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar cal = Calendar.getInstance();
        // 当前年份
        int year = 0;
        // 年的周数
        int week_index = 0;
        // 周开始时间
        long start = 0L;
        // 周结束时间
        long end = 0L;
        try
        {
            cal.setTime(sbf.parse(dateStr));
            year = cal.get(Calendar.YEAR);
            week_index = cal.get(Calendar.WEEK_OF_YEAR);
            Date date = null;
            String s = "";
            // 获取上周周一的开始时间
            cal.add(Calendar.WEEK_OF_YEAR, -1);
            // 设置日期为周一
            cal.set(Calendar.DAY_OF_WEEK, 2);
            date = cal.getTime();
            s = sbf.format(date) + " 00:00:00";
            start = sbf1.parse(s).getTime() / 1000;
            // 获取上周周日结束时间
            cal.add(Calendar.WEEK_OF_YEAR, 1);
            // 设置日期为周日
            cal.set(Calendar.DAY_OF_WEEK, 1);
            date = cal.getTime();
            s = sbf.format(date) + " 23:59:59";
            end = sbf1.parse(s).getTime() / 1000;
        }
        catch (Exception e)
        {
            LOG.info(e.getMessage(), e);
        }
        map.put("year", year);
        map.put("week_index", week_index);
        map.put("week_start", start);
        map.put("week_end", end);
        return map;
    }