如何在后端将日期转换为对应星期几？

首先：加入依赖

 <!-- 日期工具栏依赖 -->
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
        </dependency>

  private String getDayOfWeek(DateTime dateTime) {
        String dayOfWeek = "";
        switch (dateTime.getDayOfWeek()) {
            case DateTimeConstants.SUNDAY:
                dayOfWeek = "周日";
                break;
            case DateTimeConstants.MONDAY:
                dayOfWeek = "周一";
                break;
            case DateTimeConstants.TUESDAY:
                dayOfWeek = "周二";
                break;
            case DateTimeConstants.WEDNESDAY:
                dayOfWeek = "周三";
                break;
            case DateTimeConstants.THURSDAY:
                dayOfWeek = "周四";
                break;
            case DateTimeConstants.FRIDAY:
                dayOfWeek = "周五";
                break;
            case DateTimeConstants.SATURDAY:
                dayOfWeek = "周六";
            default:
                break;
        }
        return dayOfWeek;
    }

得拿到数据，遍历时间

 //把日期获取对应星期几
        for (BookingScheduleRuleVo bookingScheduleRuleVo : ruleVos){
            Date workDate = bookingScheduleRuleVo.getWorkDate();
            String dayOfWeek = this.getDayOfWeek(new DateTime(workDate));
            bookingScheduleRuleVo.setDayOfWeek(dayOfWeek);
        }