java根据当前日期获取本周和上周的日期区间

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

public class WeekAndDate {

    private static final String YEAR_MONTH_DATE_2 = "yyyyMMdd";

    public static SimpleDateFormat getFormat(String format) {
        return new SimpleDateFormat(format);
    }

    /**
     * 获取上周周几的日期,默认一周从周日开始
     *
     * @param dayOfWeek
     * @param weekOffset
     * @return
     */
    public static Date getDayOfWeek(int dayOfWeek, int weekOffset) {
        return getDayOfWeek(Calendar.SUNDAY, dayOfWeek, weekOffset);
    }

    /**
     * 获取上(下)周周几的日期
     *
     * @param firstDayOfWeek {@link Calendar} 值范围 SUNDAY,
     *                       MONDAY, TUESDAY,
     *                       WEDNESDAY, THURSDAY,
     *                       FRIDAY, and SATURDAY
     * @param dayOfWeek      {@link Calendar}
     * @param weekOffset     周偏移，上周为-1，本周为0，下周为1，以此类推
     * @return
     */
    public static Date getDayOfWeek(int firstDayOfWeek, int dayOfWeek, int weekOffset) {
        if (dayOfWeek > Calendar.SATURDAY || dayOfWeek < Calendar.SUNDAY) {
            return null;
        }
        if (firstDayOfWeek > Calendar.SATURDAY || firstDayOfWeek < Calendar.SUNDAY) {
            return null;
        }
        Calendar date = Calendar.getInstance(Locale.CHINA);
        date.setFirstDayOfWeek(firstDayOfWeek);
        // 周数减一，即上周
        date.add(Calendar.WEEK_OF_MONTH, weekOffset);
        // 日子设为周几
        date.set(Calendar.DAY_OF_WEEK, dayOfWeek);
        // 时分秒全部置0
        date.set(Calendar.HOUR_OF_DAY, 0);
        date.set(Calendar.MINUTE, 0);
        date.set(Calendar.SECOND, 0);
        date.set(Calendar.MILLISECOND, 0);
        return date.getTime();
    }

    public static void main(String[] args) {

        // 获取当周开始日期
        System.out.println("当周开始日期" +
                getFormat(YEAR_MONTH_DATE_2).format(getDayOfWeek(Calendar.SUNDAY, 0)));
        // 获取当周结束日期
        System.out.println("当周结束日期" +
                getFormat(YEAR_MONTH_DATE_2).format(getDayOfWeek(Calendar.SATURDAY, 0)));

        // 获取上周开始日期
        System.out.println("上周开始日期" +
                getFormat(YEAR_MONTH_DATE_2).format(getDayOfWeek(Calendar.SUNDAY, -1)));
        // 获取上周结束日期
        System.out.println("上周结束日期" +
                getFormat(YEAR_MONTH_DATE_2).format(getDayOfWeek(Calendar.SATURDAY, -1)));
    }

    // 获取有效的开始日期
//    private String getBeginDate(){
//
//    }


    // 获取日期结束日期，需要再批次范围内
    public String fixTheBeginDate(String batchBeginDate, String weekBeginDate) {
        String beginDate = weekBeginDate;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
        try {
            Date batchDate = simpleDateFormat.parse(batchBeginDate);
            Date weekDate = simpleDateFormat.parse(weekBeginDate);
            if (weekDate.before(batchDate)) {
                beginDate = batchBeginDate;
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return beginDate;
    }

    // 获取日期结束日期，需要再批次范围内
    public String fixTheEndDate(String batchEndDate, String weekEndDate) {
        String endDate = weekEndDate;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
        try {
            Date batchDate = simpleDateFormat.parse(batchEndDate);
            Date weekDate = simpleDateFormat.parse(weekEndDate);
            if (weekDate.after(batchDate)) {
                endDate = batchEndDate;
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return endDate;
    }


    public void xx() {
        String startDate = "20201113";
        String endDate = "20201114";
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
        try {
            Date date01 = simpleDateFormat.parse(startDate);
            Date date02 = simpleDateFormat.parse(endDate);
            if (date01.before(date02)) {
                return;
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}