转载：https://www.jianshu.com/p/b3bdd6c34e66

/**

    * 获取指定日期所在周的周一

    *

    * @param date      日期

    */publicstaticDategetFirstDayOfWeek(Datedate){Calendarc=Calendar.getInstance();c.setTime(date);if(c.get(Calendar.DAY_OF_WEEK)==1){c.add(Calendar.DAY_OF_MONTH,-1);}c.add(Calendar.DATE,c.getFirstDayOfWeek()-c.get(Calendar.DAY_OF_WEEK)+1);returnc.getTime();}

/**

    * 获取指定日期所在周的周日

    *

    * @param date      日期

    */publicstaticDategetLastDayOfWeek(Datedate){Calendarc=Calendar.getInstance();c.setTime(date);// 如果是周日直接返回if(c.get(Calendar.DAY_OF_WEEK)==1){returndate;}System.out.println(c.get(Calendar.DAY_OF_WEEK));c.add(Calendar.DATE,7-c.get(Calendar.DAY_OF_WEEK)+1);returnc.getTime();}