获取上一周的周一至周日日期

public static Map getLastWeek() {
        Map map = new HashMap();
        Calendar cal = Calendar.getInstance();
        int n = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (n == 0) {
            n = 7;
        }
        cal.add(Calendar.DATE, -(7 + (n - 1)));// 上周一的日期
        Date monday = cal.getTime();
        map.put("monday", monday);
        cal.add(Calendar.DATE, 1);
        Date tuesday = cal.getTime();
        map.put("tuesday", tuesday);
        cal.add(Calendar.DATE, 1);
        Date wednesday = cal.getTime();
        map.put("wednesday", wednesday);
        cal.add(Calendar.DATE, 1);
        Date thursday = cal.getTime();
        map.put("thursday", thursday);
        cal.add(Calendar.DATE, 1);
        Date friday = cal.getTime();
        map.put("friday", friday);
        cal.add(Calendar.DATE, 1);
        Date saturday = cal.getTime();
        map.put("saturday", saturday);
        cal.add(Calendar.DATE, 1);
        Date sunday = cal.getTime();
        map.put("sunday", sunday);
        return map;
    }