java获取周一和周五日期

//返回周一日期字符串

public static String getMonDay(){

Date date =new Date();

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

calendar.setFirstDayOfWeek(Calendar.MONDAY);

calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

calendar.set(Calendar.HOUR_OF_DAY,0);

calendar.set(Calendar.MINUTE,0);

calendar.set(Calendar.SECOND,0);

calendar.set(Calendar.MILLISECOND,0);

Date monday = calendar.getTime();

return DateUtil.format(monday);

}

//返回周五日期字符串

public static String getFriday(){

Calendar calendar = Calendar.getInstance();

int dayWeek = calendar.get(Calendar.DAY_OF_WEEK);

if (1 == dayWeek) {

calendar.add(Calendar.DAY_OF_MONTH, -1);

}

// 设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一

    calendar.setFirstDayOfWeek(Calendar.MONDAY);

// 获得当前日期是一个星期的第几天

    int day = calendar.get(Calendar.DAY_OF_WEEK);

int first = calendar.getFirstDayOfWeek();

// 计算周五的日期

    calendar.add(Calendar.DAY_OF_WEEK, first - day +4);

return DateUtil.format(calendar.getTime());

}