Java8 LocalDate/Time/DateTime最全工具类

墨蓝 2023-10-02 10:38 2阅读 0赞

### 概述 ###

LocalDate、LocalTime、LocalDateTime的使用请参考：  
[https://blog.csdn.net/Saintmm/article/details/120193455][https_blog.csdn.net_Saintmm_article_details_120193455]

### 代码 ###

废话不多说，直接上代码。

package com.saint.base.util;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.time.*;
    import java.time.format.DateTimeFormatter;
    import java.time.temporal.ChronoUnit;
    import java.util.Date;
    
    /**
     * 本地日期和时间格式化工具
     *
     * @author Saint
     * @version 1.0
     * @createTime 2021-01-08 7:00
     */
    public class LocalDateUtil {
        
        private static final Logger LOGGER = LoggerFactory.getLogger(LocalDateUtil.class);
    
        /**
         * String类型转LocalDateTime类型
         *
         * @param date    日期字符串
         * @param pattern 日期格式
         * @return LocalDateTime类型
         */
        public static LocalDateTime stringToLocalDateTime(String date, String pattern) {
        
            if (pattern == null || "".equals(pattern)) {
        
                return LocalDateTime.of(1900, 1, 1, 0, 0, 0);
            }
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return LocalDateTime.parse(date, formatter);
        }
    
        /**
         * String类型转LocalDate类型
         *
         * @param date    日期字符串
         * @param pattern 日期格式
         * @return LocalDate类型
         */
        public static LocalDate stringToLocalDate(String date, String pattern) {
        
            if (pattern == null || "".equals(pattern)) {
        
                return LocalDate.of(1900, 1, 1);
            }
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return LocalDate.parse(date, formatter);
        }
    
        /**
         * String类型转LocalTime类型
         *
         * @param date    时间字符串
         * @param pattern 时间格式
         * @return LocalTime类型
         */
        public static LocalTime stringToLocalTime(String date, String pattern) {
        
            if (pattern == null || "".equals(pattern)) {
        
                return LocalTime.of(0, 0, 0);
            }
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return LocalTime.parse(date, formatter);
        }
    
        /**
         * LocalDateTime类型转String类型
         *
         * @param localDateTime localDateTime类型日期
         * @param pattern       字符串格式
         * @return String类型
         */
        public static String localDateTimeToString(LocalDateTime localDateTime, String pattern) {
        
            if (pattern == null || "".equals(pattern)) {
        
                return "1900-01-01T00:00:00.000";
            }
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return localDateTime.format(formatter);
        }
    
        /**
         * LocalDate类型转String类型
         *
         * @param localDate localDate类型日期
         * @param pattern   字符串格式
         * @return String类型
         */
        public static String localDateToString(LocalDate localDate, String pattern) {
        
            if (pattern == null || "".equals(pattern)) {
        
                return "1900-01-01";
            }
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
            return localDate.format(formatter);
        }
    
        /**
         * Date类型转LocalDateTime类型
         *
         * @param date Date类型日期
         * @return LocalDateTime类型
         */
        public static LocalDateTime dateToLocalDateTime(Date date) {
        
            if (date == null) {
        
                return LocalDateTime.of(1900, 1, 1, 0, 0, 0);
            }
            Instant instant = date.toInstant();
            // 获取本地时区
            ZoneId zoneId = ZoneId.systemDefault();
            return LocalDateTime.ofInstant(instant, zoneId);
        }
    
        /**
         * Date类型转LocalDate类型
         *
         * @param date Date类型日期
         * @return LocalDate类型
         */
        public static LocalDate dateToLocalDate(Date date) {
        
            if (date == null) {
        
                return LocalDate.of(1900, 1, 1);
            }
            LocalDateTime localDateTime = dateToLocalDateTime(date);
            return localDateTime.toLocalDate();
        }
    
        /**
         * Date类型转LocalTime类型
         *
         * @param date Date类型日期
         * @return LocalTime类型
         */
        public static LocalTime dateToLocalTime(Date date) {
        
            if (date == null) {
        
                return LocalTime.of(0, 0, 0);
            }
            LocalDateTime localDateTime = dateToLocalDateTime(date);
            return localDateTime.toLocalTime();
        }
    
        /**
         * LocalDateTime类型转Date类型
         *
         * @param localDateTime LocalDateTime类型时间
         * @return Date类型
         */
        public static Date localDateTimeToDate(LocalDateTime localDateTime) {
        
            if (localDateTime == null) {
        
                localDateTime = LocalDateTime.of(1900, 1, 1, 0, 0, 0);
            }
            ZoneId zoneId = ZoneId.systemDefault();
            Instant instant = localDateTime.atZone(zoneId).toInstant();
            return Date.from(instant);
        }
    
        /**
         * LocalDate类型转Date类型
         *
         * @param localDate LocalDate类型日期
         * @return Date类型
         */
        public static Date localDateToDate(LocalDate localDate) {
        
            if (localDate == null) {
        
                localDate = LocalDate.of(1900, 1, 1);
            }
            ZoneId zoneId = ZoneId.systemDefault();
            Instant instant = localDate.atStartOfDay().atZone(zoneId).toInstant();
            return Date.from(instant);
        }
    
        /**
         * LocalTime类型 + LocalDate类型 转Date类型
         *
         * @param localDate LocalDate类型日期
         * @param localTime LocalTime类型时间
         * @return Date类型
         */
        public static Date localTimeToDate(LocalDate localDate, LocalTime localTime) {
        
            if (localTime == null) {
        
                return localDateToDate(localDate);
            }
            LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
            return localDateTimeToDate(localDateTime);
        }
    
        public static LocalDateTime addMonth(LocalDateTime time, int interval) {
        
            return time.plus(interval, ChronoUnit.MONTHS);
        }
    
        public static LocalDateTime addDay(LocalDateTime time, int interval) {
        
            return time.plus(interval, ChronoUnit.DAYS);
        }
    
        public static LocalDateTime addHour(LocalDateTime time, int interval) {
        
            return time.plus(interval, ChronoUnit.HOURS);
        }
    
        public static LocalDateTime addMinute(LocalDateTime time, int interval) {
        
            return time.plus(interval, ChronoUnit.MINUTES);
        }
    
        public static LocalDateTime addSecond(LocalDateTime time, int interval) {
        
            return time.plus(interval, ChronoUnit.SECONDS);
        }
    
        /**
         * 获取两个时间的时间间隔，time2-time1
         *
         * @param time1
         * @param time2
         */
        public static long getIntervalMillisecond(LocalDateTime time1, LocalDateTime time2) {
        
            return Duration.between(time1, time2).toMillis();
        }
    
    }

[https_blog.csdn.net_Saintmm_article_details_120193455]: https://blog.csdn.net/Saintmm/article/details/120193455