DateUtil 工具类，基于JDK8+

骑猪看日落 2022-08-28 08:43 126阅读 0赞

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));
        }
    
    }

转载：https://www.cnblogs.com/xieyanke/p/12836268.html