Java实例大全
/**
*根据年月返回本月共几周，每周开始与结束日期
*/
public static List<Map<String, String>> queryWeek(String year, String month) throws ParseException {
/** 周 **/
final String[] weeks = { "第一周", "第二周", "第三周", "第四周", "第五周", "第六周" };
Calendar calendar = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat sdf2 = new SimpleDateFormat("MM-dd");
calendar.setTime(sdf.parse(year + "-" + month + "-01"));
int i = calendar.get(Calendar.DAY_OF_WEEK);
int months = calendar.get(Calendar.MONTH);
switch (i) {
case 1:
calendar.add(Calendar.DATE, 1);
break;
case 2:
calendar.add(Calendar.DATE, 0);
break;
case 3:
calendar.add(Calendar.DATE, 6);
break;
case 4:
calendar.add(Calendar.DATE, 5);
break;
case 5:
calendar.add(Calendar.DATE, 4);
break;
case 6:
calendar.add(Calendar.DATE, 3);
break;
case 7:
calendar.add(Calendar.DATE, 2);
break;
default:
break;
}
// 本月的第一个星期
List<Map<String, String>> list = new ArrayList<Map<String, String>>();
int index = 0;
while (true) {
if (index++ > 0)
calendar.add(Calendar.DATE, 1);
Map<String, String> map = new HashMap<String, String>();
map.put("startTime", sdf2.format(calendar.getTime()));
map.put("start", sdf.format(calendar.getTime()));
calendar.add(Calendar.DATE, 6);
map.put("endTime", sdf2.format(calendar.getTime()));
map.put("end", sdf.format(calendar.getTime()));
map.put("week", weeks[index - 1]);
list.add(map);
// 判断是否跨月
if (months != calendar.get(Calendar.MONTH))
break;
}
return list;
}测试：
public static void main(String[] args) throws Exception {
List<Map<String, String>> list = queryWeek("2019","9");
System.out.println(list);
}结果：
[
{week=第一周, start=2019-09-02, startTime=09-02, end=2019-09-08, endTime=09-08},
{week=第二周, start=2019-09-09, startTime=09-09, end=2019-09-15, endTime=09-15},
{week=第三周, start=2019-09-16, startTime=09-16, end=2019-09-22, endTime=09-22},
{week=第四周, start=2019-09-23, startTime=09-23, end=2019-09-29, endTime=09-29},
{week=第五周, start=2019-09-30, startTime=09-30, end=2019-10-06, endTime=10-06}
]
