第一种方式:
Date InputDate = new SimpleDateFormat("yyyyMMdd").parse(String.valueOf(20140101));
Calendar cDate = Calendar.getInstance();
cDate.setFirstDayOfWeek(Calendar.MONDAY);
cDate.setTime(InputDate);
Calendar firstDate = Calendar.getInstance();
firstDate.setFirstDayOfWeek(Calendar.MONDAY);
firstDate.setTime(InputDate);
Calendar lastDate = Calendar.getInstance();
lastDate.setFirstDayOfWeek(Calendar.MONDAY);
lastDate.setTime(InputDate);
if(cDate.get(Calendar.WEEK_OF_YEAR)==1&&cDate.get(Calendar.MONTH)==11){
firstDate.set(Calendar.YEAR, cDate.get(Calendar.YEAR)+1);
lastDate.set(Calendar.YEAR, cDate.get(Calendar.YEAR)+1);
}
int typeNum = cDate.get(Calendar.WEEK_OF_YEAR);
System.out.println(typeNum);
firstDate.set(Calendar.WEEK_OF_YEAR, typeNum);
firstDate.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
//所在周开始日期
System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(firstDate.getTime()));
lastDate.set(Calendar.WEEK_OF_YEAR, typeNum);
lastDate.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
//所在周结束日期
System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(lastDate.getTime()));
第二种方式
Calendar cal = Calendar.getInstance();
cal.setTime(new SimpleDateFormat("yyyy-MM-dd").parse("2014-01-01"));
int d = 0;
if(cal.get(Calendar.DAY_OF_WEEK)==1){
d = -6;
}else{
d = 2-cal.get(Calendar.DAY_OF_WEEK);
}
cal.add(Calendar.DAY_OF_WEEK, d);
//所在周开始日期
System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime()));
cal.add(Calendar.DAY_OF_WEEK, 6);
//所在周结束日期
System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime()));
最近看java8里面的新的日期处理,用java8的api取一周的开始和结束
LocalDate inputDate = LocalDate.parse(date);
// 计算周开始时间 = 当前日期 - (当前日期是周几 - 周一)的日期差
TemporalAdjuster FIRST_OF_WEEK = TemporalAdjusters.ofDateAdjuster(localDate -> localDate.minusDays(localDate.getDayOfWeek().getValue()-DayOfWeek.MONDAY.getValue()));
System.out.println(inputDate.with(FIRST_OF_WEEK));
// 计算周开始时间 = 当前日期 + (周日 - 当前日期是周几)的日期差
TemporalAdjuster LAST_OF_WEEK = TemporalAdjusters.ofDateAdjuster(localDate -> localDate.plusDays(DayOfWeek.SUNDAY.getValue() - localDate.getDayOfWeek().getValue()));
System.out.println(inputDate.with(LAST_OF_WEEK));
java8中比较简单的方法
LocalDate inputDate = LocalDate.parse(date);
// 所在周开始时间
LocalDate beginDayOfWeek = inputDate.with(DayOfWeek.MONDAY);
// 所在周结束时间
LocalDate endDayOfWeek = inputDate.with(DayOfWeek.SUNDAY);