超详细java时间处理工具

以你之姓@ 2022-03-01 08:28 222阅读 0赞

转自：[https://www.cnblogs.com/javahr/p/9248308.html][https_www.cnblogs.com_javahr_p_9248308.html]

package com.td.util;
     
    import java.sql.Timestamp;
    import java.text.ParseException;
    import java.text.ParsePosition;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Calendar;
    import java.util.Date;
    import java.util.GregorianCalendar;
    import java.util.List;
    import java.util.Locale;
    import java.util.Random;
     
    import org.apache.log4j.chainsaw.Main;
     
    /**
     * 超详细的时间工具类
     * @author Administrator
     *
     */
    public class TimeUtil {
         
        //============================借助Calendar类获取今天、昨天、本周、上周、本年及特定时间的开始时间和结束时间（返回类型为date类型）========================
         
        /**
         * 获取当天开始时间
         * @return
         */
        public static Date getDayBegin(){
            Calendar cal=Calendar.getInstance();
            cal.set(Calendar.HOUR_OF_DAY, 0);//0点
            cal.set(Calendar.MINUTE, 0);//0分
            cal.set(Calendar.SECOND, 0);//0秒
            cal.set(Calendar.MILLISECOND, 0);//0毫秒
            return cal.getTime();
        }
         
         
        /**
         * 获取当天结束时间
         * @return
         */
        public static Date getDayEnd(){
            Calendar cal=Calendar.getInstance();
            cal.set(Calendar.HOUR_OF_DAY, 23);//23点
            cal.set(Calendar.MINUTE, 59);//59分
            cal.set(Calendar.SECOND, 59);//59秒
            return cal.getTime();
        }
         
         
        /**
         * 获取昨天开始时间
         * @return
         */
        public static Date getBeginDayOfYesterday(){
            Calendar cal=Calendar.getInstance();
            cal.setTime(getDayBegin());//当天开始时间
            cal.add(Calendar.DAY_OF_MONTH, -1);//当天月份天数减1
            return cal.getTime();
        }
         
         
        /**
         * 获取昨天结束时间
         * @return
         */
        public static Date getEndDayOfYesterday(){
            Calendar cal=Calendar.getInstance();
            cal.setTime(getDayEnd());//当天结束时间
            cal.add(Calendar.DAY_OF_MONTH, -1);//当天月份天数减1
            return cal.getTime();
        }
         
         
        /**
         * 获取明天开始时间
         * @return
         */
        public static Date getBeginDayOfTomorrow(){
            Calendar cal=Calendar.getInstance();
            cal.setTime(getDayBegin());//当天开始时间
            cal.add(Calendar.DAY_OF_MONTH, 1);//当天月份天数加1
            return cal.getTime();
        }
         
         
        /**
         * 获取明天结束时间
         * @return
         */
        public static Date getEndDayOfTomorrow(){
            Calendar cal=Calendar.getInstance();
            cal.setTime(getDayEnd());//当天结束时间
            cal.add(Calendar.DAY_OF_MONTH, 1);//当天月份天数加1
            return cal.getTime();
        }
         
         
        /**
         * 获取某个日期的开始时间
         * @param d
         * @return
         */
        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
         * @param d
         * @return
         */
        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());
        }
         
         
        /**
         * 获取本周的开始时间
         * @return
         */
        @SuppressWarnings("unused")
        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
         * @return
         */
        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);
        }
         
         
        /**
         * 获取上周开始时间
         */
        @SuppressWarnings("unused")
        public static Date getBeginDayOfLastWeek() {
            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-7);
            return getDayStartTime(cal.getTime());
        }
         
         
        /**
         * 获取上周的结束时间
         * @return
         */
        public static Date getEndDayOfLastWeek(){
            Calendar cal=Calendar.getInstance();
            cal.setTime(getBeginDayOfLastWeek());
            cal.add(Calendar.DAY_OF_WEEK, 6);
            Date weekEndSta = cal.getTime();
            return getDayEndTime(weekEndSta);
        }
         
         
        /**
         * 获取今年是哪一年
         * @return
         */
        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
         * @return
         */
        public static int getNowMonth() {
            Date date = new Date();
            GregorianCalendar gc=(GregorianCalendar)Calendar.getInstance();
            gc.setTime(date);
            return gc.get(2) + 1;
        }
         
         
        /**
         * 获取本月的开始时间
         * @return
         */
        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
         * @return
         */
        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());
        }
     
         
        /**
         * 获取上月的开始时间
         * @return
         */
        public static Date getBeginDayOfLastMonth() {
            Calendar calendar=Calendar.getInstance();
            calendar.set(getNowYear(), getNowMonth()-2, 1);
            return getDayStartTime(calendar.getTime());
        }
         
         
        /**
         * 获取上月的结束时间
         * @return
         */
        public static Date getEndDayOfLastMonth() {
            Calendar calendar=Calendar.getInstance();
            calendar.set(getNowYear(), getNowMonth()-2, 1);
            int day = calendar.getActualMaximum(5);
            calendar.set(getNowYear(), getNowMonth()-2, day);
            return getDayEndTime(calendar.getTime());
        }
         
         
        /**
         * 获取本年的开始时间
         * @return
         */
        public static java.util.Date getBeginDayOfYear() {
            Calendar cal=Calendar.getInstance();
            cal.set(Calendar.YEAR, getNowYear());
            cal.set(Calendar.MONTH, Calendar.JANUARY);
            cal.set(Calendar.DATE, 1);
            return getDayStartTime(cal.getTime());
        }
         
         
        /**
         * 获取本年的结束时间
         * @return
         */
        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());
        }
         
         
        /**
         * 两个日期相减得到的天数
         * @param beginDate
         * @param endDate
         * @return
         */
        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
         * @param beginDate
         * @param endDate
         * @return
         */
        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起
         * @param beginDate
         * @param endDate
         * @return
         */
        public static Date max(Date beginDate, Date endDate) {
            if(beginDate==null) {
                return endDate;
            }
            if(endDate==null) {
                return beginDate;
            }
            if(beginDate.after(endDate)) {//beginDate日期大于endDate
               return beginDate;
            }
            return endDate;
        }
         
         
        /**
         * 获取两个日期中的最小日期
         * @param beginDate
         * @param endDate
         * @return
         */
        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;
        }
         
         
        /**
         * 获取某月该季度的第一个月
         * @param date
         * @return
         */
        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
         * @param date
         * @param i
         * @return
         */
        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
         * @param date
         * @param i
         * @return
         */
        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();
        }
         
         
         
        /**
       * 获取某年某月按天切片日期集合（某个月间隔多少天的日期集合）
       * @param beginYear
       * @param beginMonth
       * @param k
       * @return
       */
        @SuppressWarnings({ "unchecked", "rawtypes" })
        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;
        }
         
         
        /**
         * 获取某年某月到某年某月按天的切片日期集合（间隔天数的集合）
         * @param beginYear
         * @param beginMonth
         * @param endYear
         * @param endMonth
         * @param k
         * @return
         */
        @SuppressWarnings({ "rawtypes", "unchecked" })
        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;
        }
         
         
         
         
        //=================================时间格式转换==========================
         
        /**
         * date类型进行格式化输出（返回类型：String）
         * @param date
         * @return
         */
        public static String dateFormat(Date date) {
              SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
              String dateString = formatter.format(date);
              return dateString;
         }
     
         
        /**
         * 将"2015-08-31 21:08:06"型字符串转化为Date
         * @param str
         * @return
         * @throws ParseException
         */
        public static Date StringToDate(String str) throws ParseException{
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date = (Date) formatter.parse(str);
            return date;
        }
         
         
        /**
         * 将CST时间类型字符串进行格式化输出
         * @param str
         * @return
         * @throws ParseException
         */
        public static String CSTFormat(String str) throws ParseException{
            SimpleDateFormat formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy", Locale.US);
            Date date = (Date) formatter.parse(str);
            return dateFormat(date);
        }
         
         
         
        /**
         * 将long类型转化为Date
         * @param str
         * @return
         * @throws ParseException
         */
        public static Date LongToDare(long str) throws ParseException{     
            return new Date(str * 1000); 
        }
         
         
         
         
        //====================================其他常见日期操作方法======================
         
        /**
         * 判断当前日期是否在[startDate, endDate]区间
         *
         * @param startDate 开始日期
         * @param endDate 结束日期
         * @author jqlin
         * @return
         */
        public static boolean isEffectiveDate(Date startDate, Date endDate){
            if(startDate == null || endDate == null){
                return false;
            }
            long currentTime = new Date().getTime();
            if(currentTime >= startDate.getTime()
                    && currentTime <= endDate.getTime()){
                return true;
            }
            return false;
        }
         
         
        /**
         * 得到二个日期间的间隔天数
         * @param secondString：后一个日期
         * @param firstString：前一个日期
         * @return
         */
        public static String getTwoDay(String secondString, String firstString) {
            SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
            long day = 0;
            try {
                java.util.Date secondTime = myFormatter.parse(secondString);
                java.util.Date firstTime = myFormatter.parse(firstString);
                day = (secondTime.getTime() - firstTime.getTime()) / (24 * 60 * 60 * 1000);
            } catch (Exception e) {
                return "";
            }
            return day + "";
        }
         
         
        /**
         * 时间前推或后推分钟,其中JJ表示分钟.
         * @param StringTime：时间
         * @param minute：分钟（有正负之分）
         * @return
         */
        public static String getPreTime(String StringTime, String minute) {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String mydate1 = "";
            try {
                Date date1 = format.parse(StringTime);
                long Time = (date1.getTime() / 1000) + Integer.parseInt(minute) * 60;
                date1.setTime(Time * 1000);
                mydate1 = format.format(date1);
            } catch (Exception e) {
                return "";
            }
            return mydate1;
        }
         
         
        /**
         * 将短时间格式字符串转换为时间 yyyy-MM-dd
         *
         * @param strDate
         * @return
         */
        public static Date strToDate(String strDate) {
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
            ParsePosition pos = new ParsePosition(0);
            Date strtodate = formatter.parse(strDate, pos);
            return strtodate;
        }
         
         
         
        /**
         * 得到一个时间延后或前移几天的时间
         * @param nowdate：时间
         * @param delay：前移或后延的天数
         * @return
         */
        public static String getNextDay(String nowdate, String delay) {
            try{
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                String mdate = "";
                Date d = strToDate(nowdate);
                long myTime = (d.getTime() / 1000) + Integer.parseInt(delay) * 24 * 60 * 60;
                d.setTime(myTime * 1000);
                mdate = format.format(d);
                return mdate;
            }catch(Exception e){
                return "";
            }
        }
         
         
        /**
         * 判断是否闰年
         * @param ddate
         * @return
         */
        public static boolean isLeapYear(String ddate) {
            /**
              * 详细设计： 1.被400整除是闰年，否则： 2.不能被4整除则不是闰年 3.能被4整除同时不能被100整除则是闰年
              * 3.能被4整除同时能被100整除则不是闰年
             */
            Date d = strToDate(ddate);
            GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
            gc.setTime(d);
            int year = gc.get(Calendar.YEAR);
            if ((year % 400) == 0){
                return true;
            }else if ((year % 4) == 0){
               if ((year % 100) == 0){
                   return false;
               }else{
                   return true;
               }
            }else{
                return false;
            }
        }
         
         
        /**
         * 返回美国时间格式
         * @param str
         * @return
         */
        public static String getEDate(String str) {
            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
            ParsePosition pos = new ParsePosition(0);
            Date strtodate = formatter.parse(str, pos);
            String j = strtodate.toString();
            String[] k = j.split(" ");
            return k[2] + k[1].toUpperCase() + k[5].substring(2, 4);
        }
     
         
        /**
         * 判断二个时间是否在同一个周
         * @param date1
         * @param date2
         * @return
         */
        public static boolean isSameWeekDates(Date date1, Date date2) {
            Calendar cal1 = Calendar.getInstance();
            Calendar cal2 = Calendar.getInstance();
            cal1.setTime(date1);
            cal2.setTime(date2);
            int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
            if(0 == subYear) {
                if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)){
                    return true;
                }
            }else if(1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
                // 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周
                if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)){
                    return true;
                }
            }else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
                if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)){
                    return true;
                }
            }
            return false;
        }
         
         
         
        /**
         * 产生周序列,即得到当前时间所在的年度是第几周
         * @return
         */
        public static String getSeqWeek() {
            Calendar c = Calendar.getInstance(Locale.CHINA);
            String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
            if (week.length() == 1)
            week = "0" + week;
            String year = Integer.toString(c.get(Calendar.YEAR));
            return year +"年第"+ week+"周";
        }
         
         
        /**
         * 获得一个日期所在的周的星期几的日期，如要找出2002年2月3日所在周的星期一是几号
         * @param sdate：日期
         * @param num：星期几（星期天是一周的第一天）
         * @return
         */
        public static String getWeek(String sdate, String num) {
            // 再转换为时间
            Date dd = strToDate(sdate);
            Calendar c = Calendar.getInstance();
            c.setTime(dd);
            if (num.equals("1")) // 返回星期一所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
            else if (num.equals("2")) // 返回星期二所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
            else if (num.equals("3")) // 返回星期三所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
            else if (num.equals("4")) // 返回星期四所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
            else if (num.equals("5")) // 返回星期五所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
            else if (num.equals("6")) // 返回星期六所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
            else if (num.equals("0")) // 返回星期日所在的日期
            c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
            return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
        }
         
         
        /**
         * 根据一个日期，返回是星期几的字符串
         * @param sdate
         * @return
         */
        public static String getWeek(String sdate) {
            // 再转换为时间
            Date date = strToDate(sdate);
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            // int hour=c.get(Calendar.DAY_OF_WEEK);
            // hour中存的就是星期几了，其范围 1~7
            // 1=星期日 7=星期六，其他类推
            return new SimpleDateFormat("EEEE").format(c.getTime());
        }
         
         
        /**
         * 根据一个日期，返回是星期几的字符串
         * @param sdate
         * @return
         */
        public static String getWeekStr(String sdate){
            String str = "";
            str = getWeek(sdate);
            if("1".equals(str)){
                str = "星期日";
            }else if("2".equals(str)){
                str = "星期一";
            }else if("3".equals(str)){
                str = "星期二";
            }else if("4".equals(str)){
                str = "星期三";
            }else if("5".equals(str)){
                str = "星期四";
            }else if("6".equals(str)){
                str = "星期五";
            }else if("7".equals(str)){
                str = "星期六";
            }
            return str;
        }
         
         
        /**
         * 两个时间之间的天数
         * @param date1
         * @param date2
         * @return
         */
        public static long getDays(String date1, String date2) {
            if (date1 == null || date1.equals(""))
                return 0;
            if (date2 == null || date2.equals(""))
                return 0;
            // 转换为标准时间
            SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
            java.util.Date date = null;
            java.util.Date mydate = null;
            try {
                date = myFormatter.parse(date1);
                mydate = myFormatter.parse(date2);
            } catch (Exception e) {
            }
            long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
            return day;
        }
         
         
        /**
         * 形成如下的日历 ， 根据传入的一个时间返回一个结构 星期日 星期一 星期二 星期三 星期四 星期五 星期六 下面是当月的各个时间
         * 此函数返回该日历第一行星期日所在的日期
         * @param sdate
         * @return
         */
        public static String getNowMonth(String sdate) {
            // 取该时间所在月的一号
            sdate = sdate.substring(0, 8) + "01";
     
            // 得到这个月的1号是星期几
            Date date = strToDate(sdate);
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            int u = c.get(Calendar.DAY_OF_WEEK);
            String newday = getNextDay(sdate, (1 - u) + "");
            return newday;
        }
         
         
        /**
         * 根据用户传入的时间表示格式，返回当前时间的格式 如果是yyyyMMdd，注意字母y不能大写
         * @param sformat
         * @return
         */
        public static String getUserDate(String sformat) {
            Date currentTime = new Date();
            SimpleDateFormat formatter = new SimpleDateFormat(sformat);
            String dateString = formatter.format(currentTime);
            return dateString;
        }
         
         
        /**
         * 返回一个i位数的随机数
         * @param i
         * @return
         */
        public static String getRandom(int i) {
            Random jjj = new Random();
            // int suiJiShu = jjj.nextInt(9);
            if (i == 0)
                return "";
            String jj = "";
            for (int k = 0; k < i; k++) {
                jj = jj + jjj.nextInt(9);
            }
            return jj;
        }
         
         
        /**
         * 取得数据库主键 生成格式为yyyymmddhhmmss+k位随机数
         * @param k：表示是取几位随机数，可以自己定
         * @return
         */
        public static String getNo(int k) {
            return getUserDate("yyyyMMddhhmmss") + getRandom(k);
        }
         
         
        public static void main(String[] args) {
            System.out.println(getNo(8));
        }
    }

[https_www.cnblogs.com_javahr_p_9248308.html]: https://www.cnblogs.com/javahr/p/9248308.html