Java获取本周、本月、本年、及各种时间段的工具类

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;

public class DateUtils {
    // 获取当天的开始时间
    public static java.util.Date getDayBegin() {
    Calendar cal = new GregorianCalendar();
    cal.set(Calendar.HOUR_OF_DAY, 0);
    cal.set(Calendar.MINUTE, 0);
    cal.set(Calendar.SECOND, 0);
    cal.set(Calendar.MILLISECOND, 0);
    return cal.getTime();
    }

    // 获取当天的结束时间
    public static java.util.Date getDayEnd() {
    Calendar cal = new GregorianCalendar();
    cal.set(Calendar.HOUR_OF_DAY, 23);
    cal.set(Calendar.MINUTE, 59);
    cal.set(Calendar.SECOND, 59);
    return cal.getTime();
    }

    // 获取昨天的开始时间
    public static Date getBeginDayOfYesterday() {
    Calendar cal = new GregorianCalendar();
    cal.setTime(getDayBegin());
    cal.add(Calendar.DAY_OF_MONTH, -1);
    return cal.getTime();
    }

    // 获取昨天的结束时间
    public static Date getEndDayOfYesterDay() {
    Calendar cal = new GregorianCalendar();
    cal.setTime(getDayEnd());
    cal.add(Calendar.DAY_OF_MONTH, -1);
    return cal.getTime();
    }

    // 获取明天的开始时间
    public static Date getBeginDayOfTomorrow() {
    Calendar cal = new GregorianCalendar();
    cal.setTime(getDayBegin());
    cal.add(Calendar.DAY_OF_MONTH, 1);

    return cal.getTime();
    }

    // 获取明天的结束时间
    public static Date getEndDayOfTomorrow() {
    Calendar cal = new GregorianCalendar();
    cal.setTime(getDayEnd());
    cal.add(Calendar.DAY_OF_MONTH, 1);
    return cal.getTime();
    }

    // 获取本周的开始时间
    public static Date getBeginDayOfWeek() {
    Date date = new Date();
    if (date == null) {
        return null;
    }
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
    if (dayofweek == 1) {
        dayofweek += 7;
    }
    cal.add(Calendar.DATE, 2 - dayofweek);
    return getDayStartTime(cal.getTime());
    }

    // 获取本周的结束时间
    public static Date getEndDayOfWeek() {
    Calendar cal = Calendar.getInstance();
    cal.setTime(getBeginDayOfWeek());
    cal.add(Calendar.DAY_OF_WEEK, 6);
    Date weekEndSta = cal.getTime();
    return getDayEndTime(weekEndSta);
    }

    // 获取本月的开始时间
    public static Date getBeginDayOfMonth() {
    Calendar calendar = Calendar.getInstance();
    calendar.set(getNowYear(), getNowMonth() - 1, 1);
    return getDayStartTime(calendar.getTime());
    }

    // 获取本月的结束时间
    public static Date getEndDayOfMonth() {
    Calendar calendar = Calendar.getInstance();
    calendar.set(getNowYear(), getNowMonth() - 1, 1);
    int day = calendar.getActualMaximum(5);
    calendar.set(getNowYear(), getNowMonth() - 1, day);
    return getDayEndTime(calendar.getTime());
    }

    // 获取上个月的开始时间
    public static Date getBeginDayOfLastMonth() {
    Date date = new Date();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(calendar.MONTH, -1);
    calendar.set(calendar.DAY_OF_MONTH, 1);
    return getDayStartTime(calendar.getTime());
    }

    // 获取上个月的结束时间
    public static Date getEndDayOfLastMonth() {
    Date date = new Date();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(calendar.MONTH, -1);
    int day = calendar.getActualMaximum(5);
    calendar.set(calendar.DAY_OF_MONTH, day);
    return getDayEndTime(calendar.getTime());
    }

    // 获取本年的开始时间
    public static java.util.Date getBeginDayOfYear() {
    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.YEAR, getNowYear());
    // cal.set
    cal.set(Calendar.MONTH, Calendar.JANUARY);
    cal.set(Calendar.DATE, 1);

    return getDayStartTime(cal.getTime());
    }

    // 获取本年的结束时间
    public static java.util.Date getEndDayOfYear() {
    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.YEAR, getNowYear());
    cal.set(Calendar.MONTH, Calendar.DECEMBER);
    cal.set(Calendar.DATE, 31);
    return getDayEndTime(cal.getTime());
    }

    // 获取某个日期的开始时间
    public static Timestamp getDayStartTime(Date d) {
    Calendar calendar = Calendar.getInstance();
    if (null != d)
        calendar.setTime(d);
    calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0,
        0, 0);
    calendar.set(Calendar.MILLISECOND, 0);
    return new Timestamp(calendar.getTimeInMillis());
    }

    // 获取某个日期的结束时间
    public static Timestamp getDayEndTime(Date d) {
    Calendar calendar = Calendar.getInstance();
    if (null != d)
        calendar.setTime(d);
    calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23,
        59, 59);
    calendar.set(Calendar.MILLISECOND, 999);
    return new Timestamp(calendar.getTimeInMillis());
    }

    // 获取今年是哪一年
    public static Integer getNowYear() {
    Date date = new Date();
    GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
    gc.setTime(date);
    return Integer.valueOf(gc.get(1));
    }

    // 获取本月是哪一月
    public static int getNowMonth() {
    Date date = new Date();
    GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
    gc.setTime(date);
    return gc.get(2) + 1;
    }

    // 两个日期相减得到的天数
    public static int getDiffDays(Date beginDate, Date endDate) {

    if (beginDate == null || endDate == null) {
        throw new IllegalArgumentException("getDiffDays param is null!");
    }

    long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60 * 24);

    int days = new Long(diff).intValue();

    return days;
    }

    // 两个日期相减得到的毫秒数
    public static long dateDiff(Date beginDate, Date endDate) {
    long date1ms = beginDate.getTime();
    long date2ms = endDate.getTime();
    return date2ms - date1ms;
    }

    // 获取两个日期中的最大日期
    public static Date max(Date beginDate, Date endDate) {
    if (beginDate == null) {
        return endDate;
    }
    if (endDate == null) {
        return beginDate;
    }
    if (beginDate.after(endDate)) {
        return beginDate;
    }
    return endDate;
    }

    // 获取两个日期中的最小日期
    public static Date min(Date beginDate, Date endDate) {
    if (beginDate == null) {
        return endDate;
    }
    if (endDate == null) {
        return beginDate;
    }
    if (beginDate.after(endDate)) {
        return endDate;
    }
    return beginDate;
    }

    // 返回某月该季度的第一个月
    public static Date getFirstSeasonDate(Date date) {
    final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    int sean = SEASON[cal.get(Calendar.MONTH)];
    cal.set(Calendar.MONTH, sean * 3 - 3);
    return cal.getTime();
    }

    // 返回某个日期下几天的日期
    public static Date getNextDay(Date date, int i) {
    Calendar cal = new GregorianCalendar();
    cal.setTime(date);
    cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
    return cal.getTime();
    }

    // 返回某个日期前几天的日期
    public static Date getFrontDay(Date date, int i) {
    Calendar cal = new GregorianCalendar();
    cal.setTime(date);
    cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
    return cal.getTime();
    }

    // 获取某年某月到某年某月按天的切片日期集合（间隔天数的日期集合）
    public static List getTimeList(int beginYear, int beginMonth, int endYear, int endMonth, int k) {
    List list = new ArrayList();
    if (beginYear == endYear) {
        for (int j = beginMonth; j <= endMonth; j++) {
        list.add(getTimeList(beginYear, j, k));

        }
    } else {
        {
        for (int j = beginMonth; j < 12; j++) {
            list.add(getTimeList(beginYear, j, k));
        }

        for (int i = beginYear + 1; i < endYear; i++) {
            for (int j = 0; j < 12; j++) {
            list.add(getTimeList(i, j, k));
            }
        }
        for (int j = 0; j <= endMonth; j++) {
            list.add(getTimeList(endYear, j, k));
        }
        }
    }
    return list;
    }

    // 获取某年某月按天切片日期集合（某个月间隔多少天的日期集合）
    public static List getTimeList(int beginYear, int beginMonth, int k) {
    List list = new ArrayList();
    Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
    int max = begincal.getActualMaximum(Calendar.DATE);
    for (int i = 1; i < max; i = i + k) {
        list.add(begincal.getTime());
        begincal.add(Calendar.DATE, k);
    }
    begincal = new GregorianCalendar(beginYear, beginMonth, max);
    list.add(begincal.getTime());
    return list;
    }

    // 获取某年某月的第一天日期
    public static Date getStartMonthDate(int year, int month) {
    Calendar calendar = Calendar.getInstance();
    calendar.set(year, month - 1, 1, 0, 0, 0);
    return calendar.getTime();
    }

    // 获取某年某月的最后一天日期
    public static Date getEndMonthDate(int year, int month) {
    Calendar calendar = Calendar.getInstance();
    calendar.set(year, month - 1, 1);
    int day = calendar.getActualMaximum(5);
    calendar.set(year, month - 1, day, 23, 59, 59);
    return calendar.getTime();
    }
}

/**
     * 获取某年某月的第一天日期
     */
    private Date getStartMonthDate(int year, int month) {
             Calendar calendar = Calendar.getInstance();
             calendar.set(year, month - 1, 1,0,0,0);
             return calendar.getTime();
             }

    /**
     * 获取某年某月的最后一天日期
     */
    private Date getEndMonthDate(int year, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(year, month - 1, 1);
        int day = calendar.getActualMaximum(5);
        calendar.set(year, month - 1, day,23,59,59);
        return calendar.getTime();
    }