java获取指定日期所在周的 周一 和 周日

    /**
     * 获取指定日期所在周的周一
     * 
     * @param date      日期
     */
    public static Date getFirstDayOfWeek(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        if (c.get(Calendar.DAY_OF_WEEK) == 1) {
            c.add(Calendar.DAY_OF_MONTH, -1);
        }
        c.add(Calendar.DATE, c.getFirstDayOfWeek() - c.get(Calendar.DAY_OF_WEEK) + 1);
        return c.getTime();
    }

    /**
     * 获取指定日期所在周的周日
     * 
     * @param date      日期
     */
    public static Date getLastDayOfWeek(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        // 如果是周日直接返回
        if (c.get(Calendar.DAY_OF_WEEK) == 1) {
            return date;
        }
        System.out.println(c.get(Calendar.DAY_OF_WEEK));
        c.add(Calendar.DATE, 7 - c.get(Calendar.DAY_OF_WEEK) + 1);
        return c.getTime();
    }