• 超详细的Java时间工具类


    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));
    	}
    }
    

      

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  • 原文地址:https://www.cnblogs.com/javahr/p/9248308.html
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