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

 1 public List<String> loadMonthStr(String startDate, String endDate) throws Exception {
 2         List<String> periodList = new ArrayList<>();
 3         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
 4         GregorianCalendar cdStart = new GregorianCalendar();
 5         GregorianCalendar cdEnd = new GregorianCalendar();
 6         cdStart.setTime(sdf.parse(startDate));
 7         cdEnd.setTime(sdf.parse(endDate));
 8
 9         sdf = new SimpleDateFormat("MMM yyyy", Locale.US);
10         int firstStart = cdStart.get(Calendar.DAY_OF_MONTH);
11
12         int lastEnd = cdEnd.get(Calendar.DAY_OF_MONTH);
13         int monthOfYear = cdStart.get(Calendar.MONTH) + 1;
14
15         boolean sameYearMonth = false;
16         String dateStr;
17         if (cdStart.get(Calendar.MONTH) == cdEnd.get(Calendar.MONTH) && cdStart.get(Calendar.YEAR) == cdEnd.get(Calendar.YEAR)) {
18             sameYearMonth = true;
19         }
20
21         if (sameYearMonth) {
22             dateStr = sdf.format(cdStart.getTime()) + " " + monthOfYear + "/" + firstStart + "-" + monthOfYear + "/" + lastEnd;
23             periodList.add(dateStr);
24         } else {
25             dateStr = sdf.format(cdStart.getTime()) + " " + monthOfYear + "/" + cdStart.get(Calendar.DAY_OF_MONTH) + "-"
26                     + monthOfYear + "/" + cdStart.getMaximum(Calendar.DAY_OF_MONTH);
27             periodList.add(dateStr);
28             cdStart.set(Calendar.DAY_OF_MONTH, 1);
29             cdEnd.set(Calendar.DAY_OF_MONTH, 1);
30             cdStart.add(Calendar.MONTH, 1);
31             int startDay = 0;
32             int endDay = 0;
33             while (cdStart.compareTo(cdEnd) < 0) {
34                 monthOfYear = cdStart.get(Calendar.MONTH) + 1;
35                 startDay = 1;
36                 endDay = cdStart.getActualMaximum(Calendar.DAY_OF_MONTH);
37                 dateStr = sdf.format(cdStart.getTime()) + " " + monthOfYear + "/" + startDay + "-" + monthOfYear + "/" + endDay;
38                 cdStart.add(Calendar.MONTH, 1);
39                 periodList.add(dateStr);
40             }
41             dateStr = sdf.format(cdEnd.getTime()) + " " + (cdEnd.get(Calendar.MONTH) + 1) + "/" + 1 + "-"
42                     + (cdEnd.get(Calendar.MONTH) + 1) + "/" + lastEnd;
43             periodList.add(dateStr);
44         }
45         return periodList;
46     }