Java时间处理总结,以及时间工具类的封装

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前景

作为一名刚学java不久的小菜鸟,在写项目的过程中,对时间的处理很不熟练,于是在做完项目之后,决定自己封装一个关于时间的工具类,今后在开发过程中就可以拿来就用! 我将挨个记录,并在文章的最后贴上这个类的完整代码!

获取yyyyMMddHHmmss 格式的时间
public static final String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";
private final static SimpleDateFormat sdfTimes = new SimpleDateFormat(YYYYMMDDHHMMSS);
/**
     * 获取yyyyMMddHHmmss格式
     *
     * @return
     */
    public static String getSdfTimes() {
        return sdfTimes.format(new Date());
    }
获取YYYY 格式的时间
public static final String YYYY = "yyyy";
private final static SimpleDateFormat sdfYear = new SimpleDateFormat(YYYY);
/**
     * 获取YYYY格式(年)
     *
     * @return
     */
    public static String getYear() {
        return sdfYear.format(new Date());
    }
获取MM 格式的时间(月)
public static final String MM = "MM";
private final static SimpleDateFormat sdfMM = new SimpleDateFormat(MM);
/**
     * 获取MM格式
     *
     * @return
     */
    public static String getMM() {
        return sdfMM.format(new Date());
    }
获取dd 格式的时间(日)
public static final String DD = "dd";
private final static SimpleDateFormat sdfDd = new SimpleDateFormat(DD);
/**
     * 获取dd格式
     *
     * @return
     */
    public static String getDd() {
        return sdfDd.format(new Date());
    }
获取yyyy-MM-dd 格式的时间
public static final String YYYY_MM_DD = "yyyy-MM-dd";
private final static SimpleDateFormat sdfDay = new SimpleDateFormat(YYYY_MM_DD);
/**
     * 获取yyyy-MM-dd格式
     *
     * @return
     */
    public static String getDay() {
        return sdfDay.format(new Date());
    }
获取yyyyMMdd 格式的时间
public static final String YYYYMMdd = "yyyyMMdd";
private final static SimpleDateFormat sdfDays = new SimpleDateFormat(YYYYMMdd);
/**
     * 获取yyyyMMdd格式
     *
     * @return
     */
    public static String getDays() {
        return sdfDays.format(new Date());
    }
获取YYYY-MM-DD HH:mm:ss 格式的时间
public static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";
private final static SimpleDateFormat sdfTime = new SimpleDateFormat(YYYY_MM_DD_HH_MM_SS);
/**
     * 获取YYYY-MM-DD HH:mm:ss格式
     *
     * @return
     */
    public static String getTime() {
        return sdfTime.format(new Date());
    }
日期比较 ,如果s > = e返回true 否则返回false
public static boolean compareDate(String s, String e) {
        if (fomatDate(s) == null || fomatDate(e) == null) {
            return false;
        }
        return fomatDate(s).getTime() >= fomatDate(e).getTime();
    }
String类型格式化成yyyy-MM-dd的Date类型
public static Date fomatDate(String date) {
        DateFormat fmt = new SimpleDateFormat(YYYY_MM_DD);
        try {
            return fmt.parse(date);
        } catch (ParseException e) {
            e.printStackpublic static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";Trace();
            return null;
        }
    }
String类型格式化成yyyy-MM-dd HH:mm:ss的Date类型
public static Date fomatDateToYyyyMMddHHmmss(String date) {
        DateFormat fmt = new SimpleDateFormat(YYYY_MM_DD_HH_MM_SS);
        try {
            return fmt.parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }
校验日期是否合法
public static boolean isValidDate(String s) {
        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
        try {
            fmt.parse(s);
            return true;
        } catch (Exception e) {
            return false; // 如果throw java.text.ParseException或者NullPointerException,就说明格式不对
        }
    }
时间相减得到天数
public static long getDaySub(String beginDateStr, String endDateStr) {
        long day = 0;
        SimpleDateFormat format = new SimpleDateFormat(YYYY_MM_DD);
        Date beginDate = null;
        Date endDate = null;
        try {
            beginDate = format.parse(beginDateStr);
            endDate = format.parse(endDateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        day = (endDate.getTime() - beginDate.getTime()) / (24 * 60 * 60 * 1000);
        //System.out.println("相隔的天数="+day);
        return day;
    }
得到n天之后的日期
public static String getAfterDayDate(String days) {
        int daysInt = Integer.parseInt(days);
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateStr = sdfd.format(date);
        return dateStr;
    }
得到n天之后是周几
public static String getAfterDayWeek(String days) {
        int daysInt = Integer.parseInt(days);
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("E");
        String dateStr = sdf.format(date);
        return dateStr;
    }
按照yyyy-MM-dd HH:mm:ss的格式,日期转字符串
public static String date2Str(Date date) {
        return date2Str(date, "yyyy-MM-dd HH:mm:ss");
    }
按照yyyy-MM-dd HH:mm:ss的格式,字符串转日期
public static Date str2Date(String date) {
        if (Tools.notEmpty(date)) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            try {
                return sdf.parse(date);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return new Date();
        } else {
            return null;
        }
    }
按照yyyy-MM-dd的格式,字符串转日期
public static Date strToDate(String date) {
        if (Tools.notEmpty(date)) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            try {
                return sdf.parse(date);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return new Date();
        } else {
            return null;
        }
    }
把时间根据时、分、秒转换为时间段
public static String getTimes(String StrDate) {
        String resultTimes = "";
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date now;
        try {
            now = new Date();
            Date date = df.parse(StrDate);
            long times = now.getTime() - date.getTime();
            long day = times / (24 * 60 * 60 * 1000);
            long hour = (times / (60 * 60 * 1000) - day * 24);
            long min = ((times / (60 * 1000)) - day * 24 * 60 - hour * 60);
            long sec = (times / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);

            StringBuffer sb = new StringBuffer();
            //sb.append("发表于:");
            if (hour > 0) {
                sb.append(hour + "小时前");
            } else if (min > 0) {
                sb.append(min + "分钟前");
            } else {
                sb.append(sec + "秒前");
            }
            resultTimes = sb.toString();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return resultTimes;
    }
按照参数format的格式,日期转字符串
public static String date2Str(Date date, String format) {
        if (date != null) {
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(date);
        } else {
            return "";
        }
    }

好了,现在贴上这个工具类的整个代码:

package com.center.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * 说明:日期处理
 */
public class DateUtil {

    public static final String YYYY = "yyyy";
    public static final String MM = "MM";
    public static final String DD = "dd";
    public static final String YYYY_MM_DD = "yyyy-MM-dd";
    public static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";
    public static final String YYYYMMdd = "yyyyMMdd";
    public static final String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

    private final static SimpleDateFormat sdfYear = new SimpleDateFormat(YYYY);
    private final static SimpleDateFormat sdfMM = new SimpleDateFormat(MM);
    private final static SimpleDateFormat sdfDd = new SimpleDateFormat(DD);
    private final static SimpleDateFormat sdfDay = new SimpleDateFormat(YYYY_MM_DD);
    private final static SimpleDateFormat sdfDays = new SimpleDateFormat(YYYYMMdd);
    private final static SimpleDateFormat sdfTime = new SimpleDateFormat(YYYY_MM_DD_HH_MM_SS);
    private final static SimpleDateFormat sdfTimes = new SimpleDateFormat(YYYYMMDDHHMMSS);


    /**
     * 获取yyyyMMddHHmmss格式
     *
     * @return
     */
    public static String getSdfTimes() {
        return sdfTimes.format(new Date());
    }

    /**
     * 获取YYYY格式
     *
     * @return
     */
    public static String getYear() {
        return sdfYear.format(new Date());
    }

    /**
     * 获取MM格式
     *
     * @return
     */
    public static String getMM() {
        return sdfMM.format(new Date());
    }

    /**
     * 获取dd格式
     *
     * @return
     */
    public static String getDd() {
        return sdfDd.format(new Date());
    }

    /**
     * 获取yyyy-MM-dd格式
     *
     * @return
     */
    public static String getDay() {
        return sdfDay.format(new Date());
    }

    /**
     * 获取yyyyMMdd格式
     *
     * @return
     */
    public static String getDays() {
        return sdfDays.format(new Date());
    }

    /**
     * 获取YYYY-MM-DD HH:mm:ss格式
     *
     * @return
     */
    public static String getTime() {
        return sdfTime.format(new Date());
    }

    /**
     * @param s
     * @param e
     * @return boolean
     * @throws
     * @Title: compareDate
     * @Description: (日期比较 , 如果s > = e 返回true 否则返回false)
     * @author fh
     */
    public static boolean compareDate(String s, String e) {
        if (fomatDate(s) == null || fomatDate(e) == null) {
            return false;
        }
        return fomatDate(s).getTime() >= fomatDate(e).getTime();
    }

    /**
     * String类型格式化成yyyy-MM-dd的Date类型
     *
     * @return
     */
    public static Date fomatDate(String date) {
        DateFormat fmt = new SimpleDateFormat(YYYY_MM_DD);
        try {
            return fmt.parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * String类型格式化成yyyy-MM-dd HH:mm:ss的Date类型
     *
     * @return
     */
    public static Date fomatDateToYyyyMMddHHmmss(String date) {
        DateFormat fmt = new SimpleDateFormat(YYYY_MM_DD_HH_MM_SS);
        try {
            return fmt.parse(date);
        } catch (ParseException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 校验日期是否合法
     *
     * @return
     */
    public static boolean isValidDate(String s) {
        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
        try {
            fmt.parse(s);
            return true;
        } catch (Exception e) {
            return false; // 如果throw java.text.ParseException或者NullPointerException,就说明格式不对
        }
    }

    /**
     * @param startTime
     * @param endTime
     * @return
     */
    public static int getDiffYear(String startTime, String endTime) {
        DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
        try {
            int years = (int) (((fmt.parse(endTime).getTime() - fmt.parse(startTime).getTime()) / (1000 * 60 * 60 * 24)) / 365);
            return years;
        } catch (Exception e) {
            return 0;    // 如果throw java.text.ParseException或者NullPointerException,就说明格式不对
        }
    }

    /**
     * <li>功能描述:时间相减得到天数
     *
     * @param beginDateStr
     * @param endDateStr
     * @return long
     * @author Administrator
     */
    public static long getDaySub(String beginDateStr, String endDateStr) {
        long day = 0;
        SimpleDateFormat format = new SimpleDateFormat(YYYY_MM_DD);
        Date beginDate = null;
        Date endDate = null;
        try {
            beginDate = format.parse(beginDateStr);
            endDate = format.parse(endDateStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        day = (endDate.getTime() - beginDate.getTime()) / (24 * 60 * 60 * 1000);
        //System.out.println("相隔的天数="+day);
        return day;
    }

    /**
     * 得到n天之后的日期
     *
     * @param days
     * @return
     */
    public static String getAfterDayDate(String days) {
        int daysInt = Integer.parseInt(days);
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String dateStr = sdfd.format(date);
        return dateStr;
    }

    /**
     * 得到n天之后是周几
     *
     * @param days
     * @return
     */
    public static String getAfterDayWeek(String days) {
        int daysInt = Integer.parseInt(days);
        Calendar canlendar = Calendar.getInstance(); // java.util包
        canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
        Date date = canlendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("E");
        String dateStr = sdf.format(date);
        return dateStr;
    }

    /**
     * 按照yyyy-MM-dd HH:mm:ss的格式,日期转字符串
     *
     * @param date
     * @return yyyy-MM-dd HH:mm:ss
     */
    public static String date2Str(Date date) {
        return date2Str(date, "yyyy-MM-dd HH:mm:ss");
    }

    /**
     * 按照yyyy-MM-dd HH:mm:ss的格式,字符串转日期
     *
     * @param date
     * @return
     */
    public static Date str2Date(String date) {
        if (Tools.notEmpty(date)) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            try {
                return sdf.parse(date);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return new Date();
        } else {
            return null;
        }
    }

    /**
     * 按照yyyy-MM-dd的格式,字符串转日期
     *
     * @param date
     * @return
     */
    public static Date strToDate(String date) {
        if (Tools.notEmpty(date)) {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            try {
                return sdf.parse(date);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return new Date();
        } else {
            return null;
        }
    }

    /**
     * 把时间根据时、分、秒转换为时间段
     *
     * @param StrDate
     */
    public static String getTimes(String StrDate) {
        String resultTimes = "";
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date now;
        try {
            now = new Date();
            Date date = df.parse(StrDate);
            long times = now.getTime() - date.getTime();
            long day = times / (24 * 60 * 60 * 1000);
            long hour = (times / (60 * 60 * 1000) - day * 24);
            long min = ((times / (60 * 1000)) - day * 24 * 60 - hour * 60);
            long sec = (times / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);

            StringBuffer sb = new StringBuffer();
            //sb.append("发表于:");
            if (hour > 0) {
                sb.append(hour + "小时前");
            } else if (min > 0) {
                sb.append(min + "分钟前");
            } else {
                sb.append(sec + "秒前");
            }
            resultTimes = sb.toString();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return resultTimes;
    }

    /**
     * 按照参数format的格式,日期转字符串
     *
     * @param date
     * @param format
     * @return
     */
    public static String date2Str(Date date, String format) {
        if (date != null) {
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(date);
        } else {
            return "";
        }
    }


    /**
     * 获取月份第一天
     */
    public static String getFirstDayDateOfMonth(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int last = cal.getActualMinimum(Calendar.DAY_OF_MONTH);
        cal.set(Calendar.DAY_OF_MONTH, last);
        return date2Str(cal.getTime(), "yyyy-MM-dd");
    }

    public static Date getFirstDayDateOfMonth() {
        Calendar cal = Calendar.getInstance();
        cal.setTime(new Date());
        int last = cal.getActualMinimum(Calendar.DAY_OF_MONTH);
        cal.set(Calendar.DAY_OF_MONTH, last);
        return fomatDate(date2Str(cal.getTime(), "yyyy-MM-dd"));
    }

    public static Date getSubFirstDayDateOfMonth() {
        Calendar calendar1 = Calendar.getInstance();
        calendar1.add(Calendar.MONTH, -1);
        calendar1.set(Calendar.DAY_OF_MONTH, 1);
        return fomatDate(date2Str(calendar1.getTime(), "yyyy-MM-dd"));
    }


    public static String getFirstDayDateOfWeek(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int last = cal.getActualMinimum(Calendar.DAY_OF_WEEK);
        cal.set(Calendar.DAY_OF_WEEK, last);
        return date2Str(cal.getTime(), "yyyy-MM-dd");
    }

    public static List<Date> findDates(Date dBegin, Date dEnd) {
        List lDate = new ArrayList();
        lDate.add(dBegin);
        Calendar calBegin = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calBegin.setTime(dBegin);
        Calendar calEnd = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calEnd.setTime(dEnd);
        // 测试此日期是否在指定日期之后
        while (dEnd.after(calBegin.getTime())) {
            // 根据日历的规则,为给定的日历字段添加或减去指定的时间量
            calBegin.add(Calendar.DAY_OF_MONTH, 1);
            lDate.add(calBegin.getTime());
        }
        return lDate;
    }

    public static Date addOneDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE, 1);
        return calendar.getTime();
    }

    public static Date subDay(Integer sub) {
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE, sub);
        return fomatDate(date2Str(calendar.getTime(), "yyyy-MM-dd"));
    }

    public static String getTimeByCalendar(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int year = cal.get(Calendar.YEAR);//获取年份
        int month = cal.get(Calendar.MONTH);//获取月份
        int day = cal.get(Calendar.DATE);//获取日
        int hour = cal.get(Calendar.HOUR);//小时
        int minute = cal.get(Calendar.MINUTE);//分
        int second = cal.get(Calendar.SECOND);//秒
        int WeekOfYear = cal.get(Calendar.DAY_OF_WEEK);//一周的第几天
        return "" + month + "月" + day + "日" + hour + "时" + minute + "分" + second + "秒";
    }

    public static Date getToDay() {
        return fomatDate(getDay());
    }

    /**
     * 获取分
     *
     * @return
     */
    public static Long getMinute() {
        return System.currentTimeMillis() / (1000 * 60);
    }

    /**
     * 获取秒
     *
     * @return
     */
    public static Long getSecond() {
        return System.currentTimeMillis() / 1000;
    }


    /**
     * 获取毫秒
     *
     * @return
     */
    public static Long getMillisecond() {
        return System.currentTimeMillis();
    }


    /****
     * 传入具体日期 ,返回具体日期。
     * @param date 日期(2017-04-13)
     */
    /**
     * 年月日减/加天数得到年月日
     *
     * @param date
     * @return
     * @throws ParseException
     */
    public static String stringSubDay(String date, int num) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date temp = sdf.parse(date);
        Calendar rightNow = Calendar.getInstance();
        rightNow.setTime(temp);
        rightNow.add(Calendar.DATE, num);
        return sdf.format(rightNow.getTime());
    }


    /**
     * 获取某个月份
     *
     * @param i
     * @return
     */
    public static String getLast12Months(int i) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        c.add(Calendar.MONTH, -i);
        Date m = c.getTime();
        return sdf.format(m);
    }


    /**
     * 返回之后n天
     * @param time
     * @param i
     * @return
     * @throws ParseException
     */
    public static String getNextTime(String time , int i) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        cal.setTime(sdf.parse(time));
        cal.add(Calendar.DATE, i);
        return sdf.format(cal.getTime());
    }

    /**
     * 获取之前n天
     * @param time
     * @param i
     * @return
     * @throws ParseException
     */
    public static String getPrevTime(String time , int i) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        cal.setTime(sdf.parse(time));
        cal.add(Calendar.DATE, -i);
        return sdf.format(cal.getTime());
    }

    /**
     * 返回之后n个月
     * @return
     */
    public static String getNextMonth(String time,int i) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        cal.setTime(sdf.parse(time));
        cal.add(Calendar.MONTH, i);
        return sdf.format(cal.getTime());
    }

    /**
     * 返回之前n个月
     * @return
     */
    public static String getPrevMonth(String time,int i) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        cal.setTime(sdf.parse(time));
        cal.add(Calendar.MONTH, -i);
        return sdf.format(cal.getTime());
    }


    public static void main(String[] args) {
        System.out.println(getSecond());

    }


}

求知若渴,终身编程