Calendar抽象类用法一

　　　　//日历查询

        Map finalmap = new HashMap();

　　　　 Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        //获取年
        finalmap.put("year", calendar.get(Calendar.YEAR));
        //获取月
        /*Java中的月份遵循了罗马历中的规则：当时一年中的月份数量是不固定的，
        第一个月是JANUARY。而Java中Calendar.MONTH返回的数值其实是当前月距离
        第一个月有多少个月份的数值，JANUARY在Java中返回“0”，所以我们需要+1。*/
        Integer month = calendar.get(Calendar.MONTH) + 1;
        String englishMonth = "";
        if (month == 1) {
            englishMonth = "January";
        } else if (month == 2) {
            englishMonth = "February";
        } else if (month == 3) {
            englishMonth = "March";
        } else if (month == 4) {
            englishMonth = "April";
        } else if (month == 5) {
            englishMonth = "May";
        } else if (month == 6) {
            englishMonth = "June";
        } else if (month == 7) {
            englishMonth = "July";
        } else if (month == 8) {
            englishMonth = "August";
        } else if (month == 9) {
            englishMonth = "September";
        } else if (month == 10) {
            englishMonth = "October";
        } else if (month == 11) {
            englishMonth = "November";
        } else if (month == 12) {
            englishMonth = "December";
        }
        finalmap.put("month", englishMonth);
        List<RiLi> riLis = new ArrayList<RiLi>();
        Calendar cc = Calendar.getInstance();
        cc.setTime(date);
        cc.set(cc.get(Calendar.YEAR), calendar.get(Calendar.MONTH), 1);//设置日期为本月1号
        /*Java中Calendar.DAY_OF_WEEK其实表示：一周中的第几天,如果周一为每周第一天，则不需要减1，若周日为每周第一天，则需要减1*/
        Integer currentDay = cc.get(Calendar.DAY_OF_WEEK) - 1;
        for (int i = 0; i < currentDay - 1; i++) {
            RiLi riLi = new RiLi();
            riLis.add(riLi);
        }
        calendar.set(Calendar.DATE, 1);//把日期设置为当月第一天
        /*roll方法只是对相应时间属性的域内做变化
         * 例如,对月份使用roll方法，它会在1-12的范围内变化，不会影响的年
         * 2011-1-15 roll(Calendar.MONTH, -1) 后是2011-12-15 */
        calendar.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
        //当月有多少天
        int maxDate = calendar.get(Calendar.DATE);
        Map map = new HashMap();
        VipUser user = vipUserService.selectVipuserByOpenId(openid);
        String phone = user.getPhone();
        map.put("phone", phone);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        for (int i = 1; i <= maxDate; i++) {
            calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), i, 00, 00, 00);
            Date date1 = calendar.getTime();
            calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), i, 23, 59, 59);
            Date date2 = calendar.getTime();
            map.put("date1", sdf.format(date1));
            map.put("date2", sdf.format(date2));
            List<String> list = publishService.selectRiLi(map);
            RiLi riLi = new RiLi();
            riLi.setDate(i);
            riLi.setRenwu(list);
            riLi.setDay(calendar.get(Calendar.DAY_OF_WEEK) - 1);
            riLis.add(riLi);
        }
        finalmap.put("riLis", riLis);