JAVA Date时间工具类的实例用法

本篇内容主要讲解"JAVA Date时间工具类的实例用法"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"JAVA Date时间工具类的实例用法"吧!

import java.text.ParseException;import java.time.*;import java.time.format.DateTimeFormatter;import java.time.temporal.TemporalAdjusters;import java.util.Date;/** * @description: 时间工具类 * @author: kejie.huang * @date: Created in 2019/10/10 11:08 * @version: * @modified By: */public class DateUtils {    public static final String DATE_FORMART_YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";    /**     * 指定日期加上天数后的日期     * @param num 为增加的天数     * @param currentDate 创建时间     * @return     * @throws ParseException     */    public static Date plusDay(int num, Date currentDate) {        LocalDateTime localDateTime = dateConvertLocalDateTime(currentDate);        localDateTime = localDateTime.plusDays(num);        return localDateTimeConvertDate(localDateTime);    }    /**     * @description 根据时间字符串转换成     * @return     * @author kejie.huang     * @date 2019/10/10 11:19     */    public static Date dateStrConvertDate(String currentDate, String formateStr) {        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formateStr);        LocalDateTime localDateTime = LocalDateTime.parse(currentDate, dateTimeFormatter);        return localDateTimeConvertDate(localDateTime);    }    /**     * @return     * @description 根据date转换成localDateTime     * @author kejie.huang     * @date 2019/10/14 14:31     */    private static LocalDateTime dateConvertLocalDateTime(Date date) {        LocalDateTime localDateTime = Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();        return localDateTime;    }    /**     * @return     * @description 方法描述 根据localDateTime转换成date     * @author kejie.huang     * @date 2019/10/14 14:31     */    public static Date localDateTimeConvertDate(LocalDateTime localDateTime) {        return Date.from(getZonedDateTimeByLocalDateTime(localDateTime).toInstant());    }    /**     * @description 根据时间转换成时间字符串     * @return     * @author kejie.huang     * @date 2019/10/10 11:19     */    public static String formatDateToParse(Date currentDate, String formateStr) {        LocalDateTime localDateTime = dateConvertLocalDateTime(currentDate);        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(formateStr);        return dateTimeFormatter.format(localDateTime);    }    /**     * @description 根据开始时间，结束时间进行对比     * @param startDate 开始时间     * @param endDate 结束时间     * @return     * @author kejie.huang     * @date 2019/10/10 11:16     */    public static boolean compareDay(Date startDate, Date endDate) {        return startDate.before(endDate);    }    /**     * @title DateUtils     * @Description获取本月第一天     * @author kejie.huang     * @Date 2019/10/14 10:52     * @Copyright 2019-2020     */    public static Date getMonthFirstDay() {        LocalDateTime date = LocalDateTime.now();        LocalDateTime firstday = date.with(TemporalAdjusters.firstDayOfMonth());        return localDateTimeConvertDate(firstday);    }    /**     * @title DateUtils     * @Description获取本月最后一天     * @author kejie.huang     * @Date 2019/10/14 10:52     * @Copyright 2019-2020     */    public static Date getMonthLastDay() {        LocalDateTime date = LocalDateTime.now();        LocalDateTime lastday = date.with(TemporalAdjusters.lastDayOfMonth());        return localDateTimeConvertDate(lastday);    }    /**     * @title DateUtils     * @Description 根据localDateTime转换成ZonedDateTime对象，用于把localDatTime转成Date     * @author kejie.huang     * @Date 2019/10/14 11:03     * @Copyright 2019-2020     */    public static ZonedDateTime getZonedDateTimeByLocalDateTime(LocalDateTime localDateTime) {        ZoneId zoneId = ZoneId.systemDefault();        ZonedDateTime zonedDateTime = localDateTime.atZone(zoneId);        return zonedDateTime;    }    /**     * @return     * @description 获得某天最大时间 2019-10-14 23:59:59     * @author kejie.huang     * @date 2019/10/14 10:56     */    public static Date getEndOfDay(Date date) {        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());        ;        LocalDateTime endOfDay = localDateTime.with(LocalTime.MAX);        return localDateTimeConvertDate(endOfDay);    }    /**     * @return     * @description 获得某天最小时间 2019-10-14 00:00:00     * @author kejie.huang     * @date 2019/10/14 10:57     */    public static Date getStartOfDay(Date date) {        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()), ZoneId.systemDefault());        LocalDateTime startOfDay = localDateTime.with(LocalTime.MIN);        return localDateTimeConvertDate(startOfDay);    }}

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