• java8 DateUtil工具


    基于Jdk8日期工具

    基本能覆盖日常开发所需日期处理

    package com.xx.dubbo.dubboservice.utils;
    
    import java.time.*;
    import java.time.format.DateTimeFormatter;
    import java.time.temporal.ChronoUnit;
    import java.time.temporal.TemporalAdjusters;
    import java.time.temporal.WeekFields;
    import java.util.Date;
    import java.util.Locale;
    
    /**
     * 日期工具
     * @description:
     * @author: gongchang
     * @time: 2020/5/6 9:43
     */
    public class DateUtil {
    
        //数据库格式的日期
        public static final String SQL_MONTH = "yyyy-MM";
        public static final String SQL_DATE = "yyyy-MM-dd";
        public static final String SQL_TIME = "yyyy-MM-dd HH:mm:ss";
        public static final String SQL_TIMESTAMP = "yyyy-MM-dd HH:mm:ss.SS";
    
        //斜杠格式的日期
        public static final String DATE = "yyyy/MM/dd";
        public static final String TIMESTAMP = "yyyy/MM/dd HH:mm:ss.SS";
        public static final String TIMESTAMP_SHORT = "yyyy/MM/dd HH:mm";
        public static final String TIME = "HH:mm:ss";
        public static final String TIME_SHORT = "HH:mm";
    
        //不常用日期格式
        public static final String CHINESEDATE = "yyyy年MM月dd日";
        public static final String DATE_TIME = "yyyyMMddHHmmss";
        public static final String DATE_TIME_DETAIL = "yyyyMMddHHmmssSS";
        public static final String DATE_DAY = "yyyyMMdd";
        public static final String DATE_HOUR = "yyyyMMddHH";
    
    
        /**
         * 防止被实例化
         */
        private DateUtil(){
    
        }
    
        /**
         * Date转LocalDateTime
         * 使用系统时区
         * @param date
         * @return
         */
        public static LocalDateTime dateToLocalDateTime(Date date){
            Instant instant = date.toInstant();
            return instant.atZone(ZoneId.systemDefault()).toLocalDateTime();
        }
    
        /**
         * LocalDateTime转Date
         * 使用系统时区
         * @param localDateTime
         * @return
         */
        public static Date localDateTimeToDate(LocalDateTime localDateTime){
            ZonedDateTime zdt = localDateTime.atZone(ZoneId.systemDefault());
            return Date.from(zdt.toInstant());
        }
    
        /**
         * 日期转字符串
         * @param localDateTime
         * @param pattern
         * @return
         */
        public static String dateTimeToStr(LocalDateTime localDateTime, String pattern) {
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return localDateTime.format(formatter);
        }
    
        /**
         * 将字符串日期解析为java.time.LocalDateTime
         * @param dateTimeStr
         * @param pattern
         * @return
         */
        public static LocalDateTime strToLocalDateTime(String dateTimeStr, String pattern) {
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return LocalDateTime.parse(dateTimeStr, formatter);
        }
    
        /**
         * 开始日期,补齐" 00:00:00"
         *
         * @param localDateTime
         * @return
         */
        public static LocalDateTime getStartDateTimeWithHMS(LocalDateTime localDateTime) {
            return LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.MIN);
        }
    
        /**
         * 结束日期,补齐" 23:59:59"
         * @param localDateTime
         * @return
         */
        public static LocalDateTime getEndDateWithHMS(LocalDateTime localDateTime){
            return LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.MAX);
        }
    
    
    
        public static LocalDateTime getAfterYears(LocalDateTime localDateTime, int count){
            return localDateTime.plusYears(count);
        }
    
        public static LocalDateTime getAfterMonths(LocalDateTime localDateTime, int count){
            return localDateTime.plusMonths(count);
        }
    
        public static LocalDateTime getAfterDays(LocalDateTime localDateTime, int count){
            return localDateTime.plusDays(count);
        }
    
        public static LocalDateTime getAfterMinutes(LocalDateTime localDateTime, int count){
            return localDateTime.plusMinutes(count);
        }
    
        public static LocalDateTime getAfterSeconds(LocalDateTime localDateTime, int count){
            return localDateTime.plusSeconds(count);
        }
    
    
    
        /**
         * 获得当前年的第一天
         * @param
         * @return
         */
        public static LocalDateTime getYearFirstDay(LocalDateTime localDateTime) {
            return localDateTime.with(TemporalAdjusters.firstDayOfYear());
        }
    
        /**
         * 获得当前年的最后一天
         * @param
         * @return
         */
        public static LocalDateTime getYearLastDay(LocalDateTime localDateTime) {
            return localDateTime.with(TemporalAdjusters.lastDayOfYear());
        }
    
    
        /**
         * 获得当前月的第一天
         * @param
         * @return
         */
        public static LocalDateTime getMonthFirstDay(LocalDateTime localDateTime) {
            return localDateTime.with(TemporalAdjusters.firstDayOfMonth());
        }
    
        /**
         * 获得当前月的最后一天
         * @param
         * @return
         */
        public static LocalDateTime getMonthLastDay(LocalDateTime localDateTime) {
            return localDateTime.with(TemporalAdjusters.lastDayOfMonth());
        }
    
    
        /**
         * 获得当前星期的第一天
         * @param localDateTime
         * @param locale 默认Locale.CHINA 周日为一周的第一天
         * @return
         */
        public static LocalDateTime getWeekFirstDay(LocalDateTime localDateTime, Locale locale) {
            return localDateTime.with(WeekFields.of(locale==null?Locale.CHINA:locale).dayOfWeek(),1);
        }
    
        /**
         * 获得当前星期的最后一天
         * @param localDateTime
         * @param locale 默认默认Locale.CHINA 周日为一周的第一天
         * @return
         */
        public static LocalDateTime getWeekLastDay(LocalDateTime localDateTime, Locale locale) {
            return localDateTime.with(WeekFields.of(locale==null?Locale.CHINA:locale).dayOfWeek(),7);
        }
    
    
    
        /**
         * 计算两个日期之间相差年数
         * @param smallDateTime 较小的时间
         * @param bigDateTime  较大的时间
         * @return 相差年数
         */
        public static int getYearDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime) {
            return (int)smallDateTime.until(bigDateTime, ChronoUnit.YEARS);
        }
    
        /**
         * 计算两个日期之间相差月数
         * @param smallDateTime 较小的时间
         * @param bigDateTime  较大的时间
         * @return 相差月数
         */
        public static int getMonthDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime) {
            return (int)smallDateTime.until(bigDateTime, ChronoUnit.MONTHS);
        }
    
        /**
         * 计算两个日期之间相差的天数
         * @param smallDateTime 较小的时间
         * @param bigDateTime  较大的时间
         * @return 相差天数
         */
        public static int getDayDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){
            return (int)smallDateTime.until(bigDateTime, ChronoUnit.DAYS);
        }
    
        /**
         * 计算两个日期之间相差小时数
         * @param smallDateTime 较小的时间
         * @param bigDateTime  较大的时间
         * @return 相差小时数
         */
        public static int getHourDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){
            return (int)smallDateTime.until(bigDateTime, ChronoUnit.HOURS);
        }
    
        /**
         * 计算两个日期之间相差分钟数
         * @param smallDateTime
         * @param bigDateTime
         * @return 相差分钟数
         */
        public static int getMinutesDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){
            return (int)smallDateTime.until(bigDateTime, ChronoUnit.MINUTES);
        }
    
        /**
         * 计算两个日期之间相差秒数
         * @param smallDateTime
         * @param bigDateTime
         * @return 相差秒数
         */
        public static int getSecondsDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){
            return (int)smallDateTime.until(bigDateTime, ChronoUnit.SECONDS);
        }
    
    
        public static void main(String[] args) {
            LocalDateTime now = LocalDateTime.now();
            System.out.println(getAfterMonths(now, 1));
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/xieyanke/p/12836268.html
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