java 给定一个日期期间 返回形如Mar 2015 3/20-3/31的数据

最近一个项目中有个前台对于表头要求：

给定一个日期期间返回形如

Mar 2015 3/20-3/31
Apr 2015 4/1-4/30

这样的月年数据，简单的写了下代码，暂时没想到更好的办法

例如传进来的参数是 "2015-03-20"-"2016-04-08" 这样的形式

分三段处理：

第一段：起始日期的起始日期的月底

第二段：开始和结束月之间的所有月数据

第三段：结束日期的月初到结束日期

 public List<String> loadMonthStr(String startDate, String endDate) throws Exception {
         List<String> periodList = new ArrayList<>();
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
         GregorianCalendar cdStart = new GregorianCalendar();
         GregorianCalendar cdEnd = new GregorianCalendar();
         cdStart.setTime(sdf.parse(startDate));
         cdEnd.setTime(sdf.parse(endDate));

         sdf = new SimpleDateFormat("MMM yyyy", Locale.US);
         int firstStart = cdStart.get(Calendar.DAY_OF_MONTH);

         int lastEnd = cdEnd.get(Calendar.DAY_OF_MONTH);
         int monthOfYear = cdStart.get(Calendar.MONTH) + 1;

         boolean sameYearMonth = false;
         String dateStr;
         if (cdStart.get(Calendar.MONTH) == cdEnd.get(Calendar.MONTH) && cdStart.get(Calendar.YEAR) == cdEnd.get(Calendar.YEAR)) {
             sameYearMonth = true;
         }

         if (sameYearMonth) {
             dateStr = sdf.format(cdStart.getTime()) + " " + monthOfYear + "/" + firstStart + "-" + monthOfYear + "/" + lastEnd;
             periodList.add(dateStr);
         } else {
             dateStr = sdf.format(cdStart.getTime()) + " " + monthOfYear + "/" + cdStart.get(Calendar.DAY_OF_MONTH) + "-"
                     + monthOfYear + "/" + cdStart.getMaximum(Calendar.DAY_OF_MONTH);
             periodList.add(dateStr);
             cdStart.set(Calendar.DAY_OF_MONTH, 1);
             cdEnd.set(Calendar.DAY_OF_MONTH, 1);
             cdStart.add(Calendar.MONTH, 1);
             int startDay = 0;
             int endDay = 0;
             while (cdStart.compareTo(cdEnd) < 0) {
                 monthOfYear = cdStart.get(Calendar.MONTH) + 1;
                 startDay = 1;
                 endDay = cdStart.getActualMaximum(Calendar.DAY_OF_MONTH);
                 dateStr = sdf.format(cdStart.getTime()) + " " + monthOfYear + "/" + startDay + "-" + monthOfYear + "/" + endDay;
                 cdStart.add(Calendar.MONTH, 1);
                 periodList.add(dateStr);
             }
             dateStr = sdf.format(cdEnd.getTime()) + " " + (cdEnd.get(Calendar.MONTH) + 1) + "/" + 1 + "-"
                     + (cdEnd.get(Calendar.MONTH) + 1) + "/" + lastEnd;
             periodList.add(dateStr);
         }
         return periodList;
     }