Java中常用的时间处理方法

年爸 1年前 ⋅ 1076 阅读

说明:在Java开发中时间类型数据处理是非常常见的,几乎每个成型的项目都会遇到,以下总结了一些本人在开发中常用的时间处理方法,希望对小伙伴儿们有所帮助!不多说,上代码!

package com.xxx.project.core.utils.date;

import io.searchbox.strings.StringUtils;

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

/**
 * 时间处理类
 *
 * @author 年爸
 * @QQ     526704425
 * @version 1.0
 * @date    2019-03-01
 */
public class DateUtils {

    public static final String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String MINUTE_PATTERN = "yyyy-MM-dd HH:mm";
    public static final String HOUR_PATTERN = "yyyy-MM-dd HH:mm:ss";
    public static final String DATE_PATTERN = "yyyy-MM-dd";
    public static final String MONTH_PATTERN = "yyyy-MM";
    public static final String YEAR_PATTERN = "yyyy";
    public static final String MINUTE_ONLY_PATTERN = "mm";
    public static final String HOUR_ONLY_PATTERN = "HH";

    /**
     * 日期相加减天数
     * @param date 如果为Null,则为当前时间
     * @param days 加减天数
     * @param includeTime 是否包括时分秒,true表示包含
     * @return
     * @throws ParseException
     */
    public static Date dateAdd(Date date, int days, boolean includeTime) throws ParseException{
        if(date == null){
            date = new Date();
        }
        if(!includeTime){
            SimpleDateFormat sdf = new SimpleDateFormat(DateUtils.DATE_PATTERN);
            date = sdf.parse(sdf.format(date));
        }
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        cal.add(Calendar.DATE, days);
        return cal.getTime();
    }

    /**
     * 时间格式化成字符串
     * @param date Date
     * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN, 如果为空,则为yyyy-MM-dd
     * @return
     * @throws ParseException
     */
    public static String dateFormat(Date date, String pattern) throws ParseException{
        if(StringUtils.isBlank(pattern)){
            pattern = DateUtils.DATE_PATTERN;
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.format(date);
    }

    /**
     * 字符串解析成时间对象
     * @param dateTimeString String
     * @param pattern StrUtils.DATE_TIME_PATTERN || StrUtils.DATE_PATTERN,如果为空,则为yyyy-MM-dd
     * @return
     * @throws ParseException
     */
    public static Date dateParse(String dateTimeString, String pattern) throws ParseException{
        if(StringUtils.isBlank(pattern)){
            pattern = DateUtils.DATE_PATTERN;
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        return sdf.parse(dateTimeString);
    }

    /**
     * 将日期时间格式成只有日期的字符串(可以直接使用dateFormat,Pattern为Null进行格式化)
     * @param dateTime Date
     * @return
     * @throws ParseException
     */
    public static String dateTimeToDateString(Date dateTime) throws ParseException{
        String dateTimeString = DateUtils.dateFormat(dateTime, DateUtils.DATE_TIME_PATTERN);
        return dateTimeString.substring(0, 10);
    }

    /**
     * 当时、分、秒为00:00:00时,将日期时间格式成只有日期的字符串,
     * 当时、分、秒不为00:00:00时,直接返回
     * @param dateTime Date
     * @return
     * @throws ParseException
     */
    public static String dateTimeToDateStringIfTimeEndZero(Date dateTime) throws ParseException{
        String dateTimeString = DateUtils.dateFormat(dateTime, DateUtils.DATE_TIME_PATTERN);
        if(dateTimeString.endsWith("00:00:00")){
            return dateTimeString.substring(0, 10);
        }else{
            return dateTimeString;
        }
    }

    /**
     * 将日期时间格式成日期对象,和dateParse互用
     * @param dateTime Date
     * @return Date
     * @throws ParseException
     */
    public static Date dateTimeToDate(Date dateTime) throws ParseException{
        Calendar cal = Calendar.getInstance();
        cal.setTime(dateTime);
        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();
    }

    /**
     * 时间加减小时
     * @param startDate 要处理的时间,Null则为当前时间
     * @param hours 加减的小时
     * @return Date
     */
    public static Date dateAddHours(Date startDate, int hours) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.HOUR, c.get(Calendar.HOUR) + hours);
        return c.getTime();
    }

    /**
     * 时间加减分钟
     * @param startDate 要处理的时间,Null则为当前时间
     * @param minutes 加减的分钟
     * @return
     */
    public static Date dateAddMinutes(Date startDate, int minutes) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.MINUTE, c.get(Calendar.MINUTE) + minutes);
        return c.getTime();
    }

    /**
     * 时间加减秒数
     * @param startDate 要处理的时间,Null则为当前时间
     * @return
     */
    public static Date dateAddSeconds(Date startDate, int seconds) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.SECOND, c.get(Calendar.SECOND) + seconds);
        return c.getTime();
    }

    /**
     * 时间加减天数
     * @param startDate 要处理的时间,Null则为当前时间
     * @param days 加减的天数
     * @return Date
     */
    public static Date dateAddDays(Date startDate, int days) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.DATE, c.get(Calendar.DATE) + days);
        return c.getTime();
    }

    /**
     * 时间加减月数
     * @param startDate 要处理的时间,Null则为当前时间
     * @param months 加减的月数
     * @return Date
     */
    public static Date dateAddMonths(Date startDate, int months) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.MONTH, c.get(Calendar.MONTH) + months);
        return c.getTime();
    }

    /**
     * 时间加减年数
     * @param startDate 要处理的时间,Null则为当前时间
     * @param years 加减的年数
     * @return Date
     */
    public static Date dateAddYears(Date startDate, int years) {
        if (startDate == null) {
            startDate = new Date();
        }
        Calendar c = Calendar.getInstance();
        c.setTime(startDate);
        c.set(Calendar.YEAR, c.get(Calendar.YEAR) + years);
        return c.getTime();
    }

    /**
     * 时间比较(如果myDate>compareDate返回1,<返回-1,相等返回0)
     * @param myDate 时间
     * @param compareDate 要比较的时间
     * @return int
     */
    public static int dateCompare(Date myDate, Date compareDate) {
        Calendar myCal = Calendar.getInstance();
        Calendar compareCal = Calendar.getInstance();
        myCal.setTime(myDate);
        compareCal.setTime(compareDate);
        return myCal.compareTo(compareCal);
    }

    /**
     * 获取两个时间中最小的一个时间
     * @param date
     * @param compareDate
     * @return
     */
    public static Date dateMin(Date date, Date compareDate) {
        if(date == null){
            return compareDate;
        }
        if(compareDate == null){
            return date;
        }
        if(1 == dateCompare(date, compareDate)){
            return compareDate;
        }else if(-1 == dateCompare(date, compareDate)){
            return date;
        }
        return date;
    }

    /**
     * 获取两个时间中最大的一个时间
     * @param date
     * @param compareDate
     * @return
     */
    public static Date dateMax(Date date, Date compareDate) {
        if(date == null){
            return compareDate;
        }
        if(compareDate == null){
            return date;
        }
        if(1 == dateCompare(date, compareDate)){
            return date;
        }else if(-1 == dateCompare(date, compareDate)){
            return compareDate;
        }
        return date;
    }

    /**
     * 获取两个日期(不含时分秒)相差的天数,不包含今天
     * @param startDate
     * @param endDate
     * @return
     * @throws ParseException
     */
    public static int dateBetween(Date startDate, Date endDate) throws ParseException {
        Date dateStart = dateParse(dateFormat(startDate, DATE_PATTERN), DATE_PATTERN);
        Date dateEnd = dateParse(dateFormat(endDate, DATE_PATTERN), DATE_PATTERN);
        return (int) ((dateEnd.getTime() - dateStart.getTime())/1000/60/60/24);
    }

    /**
     * 获取两个日期(不含时分秒)相差的天数,包含今天
     * @param startDate
     * @param endDate
     * @return
     * @throws ParseException
     */
    public static int dateBetweenIncludeToday(Date startDate, Date endDate) throws ParseException {
        return dateBetween(startDate, endDate) + 1;
    }

    /**
     * 获取日期时间的年份,如2017-02-13,返回2017
     * @param date
     * @return
     */
    public static int getYear(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.YEAR);
    }

    /**
     * 获取日期时间的月份,如2017年2月13日,返回2
     * @param date
     * @return
     */
    public static int getMonth(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.MONTH) + 1;
    }

    /**
     * 获取日期时间的第几天(即返回日期的dd),如2017-02-13,返回13
     * @param date
     * @return
     */
    public static int getDate(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.get(Calendar.DATE);
    }

    /**
     * 获取日期时间当月的总天数,如2017-02-13,返回28
     * @param date
     * @return
     */
    public static int getDaysOfMonth(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.getActualMaximum(Calendar.DATE);
    }

    /**
     * 获取日期时间当年的总天数,如2017-02-13,返回2017年的总天数
     * @param date
     * @return
     */
    public static int getDaysOfYear(Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        return cal.getActualMaximum(Calendar.DAY_OF_YEAR);
    }

    /**
     * 根据时间获取当月最大的日期
     * <li>2017-02-13,返回2017-02-28</li>
     * <li>2016-02-13,返回2016-02-29</li>
     * <li>2016-01-11,返回2016-01-31</li>
     * @param date Date
     * @return
     * @throws Exception
     */
    public static Date maxDateOfMonth(Date date) throws Exception {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int value = cal.getActualMaximum(Calendar.DATE);
        return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
    }

    /**
     * 根据时间获取当月最小的日期,也就是返回当月的1号日期对象
     * @param date Date
     * @return
     * @throws Exception
     */
    public static Date minDateOfMonth(Date date) throws Exception {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);
        int value = cal.getActualMinimum(Calendar.DATE);
        return dateParse(dateFormat(date, MONTH_PATTERN) + "-" + value, null);
    }
}

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