java 中获取2个时间段中所包含的周数(股票的周数->从周六到周五)

Calendar 类中是以周日为开始的第一天的,所以Calendar.DAY_OF_WEEK为1的时候是周日.

在股票中有日K 周K和月K的数据. 

在此之中的周K是指交易日中一周的数据,周六到周五为一个周期.

 1 /**
 2      * 返回2个日期间有多少股票周
 3      * @param startDate 2012-02-01 开始日期
 4      * @param endDate  2014-02-01   结束日期
 5      * @return
 6      */
 7     public static  int getStockWeeks(String  startDate,String endDate){
 8         int a = 0;
 9         try {
10             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
11             Calendar before = Calendar.getInstance();
12             Calendar after = Calendar.getInstance();
13             Calendar temp = Calendar.getInstance();
14
15             before.setTime(sdf.parse(startDate));
16             after.setTime(sdf.parse(endDate));
17
18             long time1 = before.getTime().getTime();
19             long time2 = after.getTime().getTime();
20
21             if(time1>time2){//开始和结束时间对换了(有可能前后时间给错了)
22                 temp=before;
23                 before=after;
24                 after=temp;
25             }
26
27             int week = before.get(Calendar.DAY_OF_WEEK);
28
29             before.add(Calendar.DATE, -week);//并非周一为第一天  周六为第一天
30
31             week = after.get(Calendar.DAY_OF_WEEK);
32
33             if(week>0&&week<7)after.add(Calendar.DATE, 6 - week);
34             if(week==7)after.add(Calendar.DATE, 6);
35             a= (int) ((after.getTimeInMillis() - before
36                     .getTimeInMillis()) / CONST_WEEK);
37             a = a - 1;
38             if (a == 0) {
39                 a = 1;
40             }
41         } catch (Exception e) {
42             e.printStackTrace();
43         }
44         return a;
45     }
46