efs/eladmin-common/src/main/java/me/zhengjie/utils/DateUtil.java

/*
 * Copyright 2019-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package me.zhengjie.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.Date;

/**
 * @author: liaojinlong
 * @date: 2020/6/11 16:28
 * @apiNote: JDK 8 新日期类 格式化与字符串转换 工具类
 */
public class DateUtil {

	public static final DateTimeFormatter DFY_MD_HMS = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
	public static final DateTimeFormatter DFY_MD = DateTimeFormatter.ofPattern("yyyy-MM-dd");
	public static final DateTimeFormatter DFYMD = DateTimeFormatter.ofPattern("yyyyMMdd");
	public static final DateTimeFormatter yyyy_mm_dd = DateTimeFormatter.ofPattern("yyyy-MM-dd");

	/**
	 * LocalDateTime 转时间戳
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static Long getTimeStamp(LocalDateTime localDateTime) {
		return localDateTime.atZone(ZoneId.systemDefault()).toEpochSecond();
	}

	/**
	 * 时间戳转LocalDateTime
	 *
	 * @param timeStamp /
	 * @return /
	 */
	public static LocalDateTime fromTimeStamp(Long timeStamp) {
		return LocalDateTime.ofEpochSecond(timeStamp, 0, OffsetDateTime.now().getOffset());
	}

	/**
	 * LocalDateTime 转 Date Jdk8 后 不推荐使用 {@link Date} Date
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static Date toDate(LocalDateTime localDateTime) {
		return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
	}

	/**
	 * LocalDate 转 Date Jdk8 后 不推荐使用 {@link Date} Date
	 *
	 * @param localDate /
	 * @return /
	 */
	public static Date toDate(LocalDate localDate) {
		return toDate(localDate.atTime(LocalTime.now(ZoneId.systemDefault())));
	}

	/**
	 * Date转 LocalDateTime Jdk8 后 不推荐使用 {@link Date} Date
	 *
	 * @param date /
	 * @return /
	 */
	public static LocalDateTime toLocalDateTime(Date date) {
		return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
	}

	/**
	 * 日期 格式化
	 *
	 * @param localDateTime /
	 * @param patten        /
	 * @return /
	 */
	public static String localDateTimeFormat(LocalDateTime localDateTime, String patten) {
		DateTimeFormatter df = DateTimeFormatter.ofPattern(patten);
		return df.format(localDateTime);
	}

	/**
	 * 日期 格式化
	 *
	 * @param localDateTime /
	 * @param df            /
	 * @return /
	 */
	public static String localDateTimeFormat(LocalDateTime localDateTime, DateTimeFormatter df) {
		return df.format(localDateTime);
	}

	/**
	 * 日期格式化 yyyy-MM-dd HH:mm:ss
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static String localDateTimeFormatyMdHms(LocalDateTime localDateTime) {
		return DFY_MD_HMS.format(localDateTime);
	}

	/**
	 * 日期格式化 yyyy-MM-dd
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public String localDateTimeFormatyMd(LocalDateTime localDateTime) {
		return DFY_MD.format(localDateTime);
	}
	/**
	 * 日期格式化 yyyy-MM-dd
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static String formatYmd(LocalDate localDateTime) {
		return DFYMD.format(localDateTime);
	}
	public static LocalDate parseYmd(String localDateTime) {
		return LocalDate.parse(localDateTime, DFYMD);
	}
	/**
	 * 字符串转 LocalDateTime ，字符串格式 yyyy-MM-dd
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static LocalDateTime parseLocalDateTimeFormat(String localDateTime, String pattern) {
		DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern);
		return LocalDateTime.from(dateTimeFormatter.parse(localDateTime));
	}

	/**
	 * 字符串转 LocalDateTime ，字符串格式 yyyy-MM-dd
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static LocalDateTime parseLocalDateTimeFormat(String localDateTime, DateTimeFormatter dateTimeFormatter) {
		return LocalDateTime.from(dateTimeFormatter.parse(localDateTime));
	}

	public static String format(String date) {

		SimpleDateFormat sourceFormat = new SimpleDateFormat("yyyyMMdd");
		SimpleDateFormat targetFormat = new SimpleDateFormat("yyyy年MM月dd");
		Date d;
		try {
			d = sourceFormat.parse(date);
			String formatDate = targetFormat.format(d);
			return formatDate;
		} catch (ParseException e) {

			e.printStackTrace();
		}
		return date;
	}

	public static String localDate(LocalDate date) {

		return DFY_MD.format(date);

	}

	/**
	 * 字符串转 LocalDateTime ，字符串格式 yyyy-MM-dd HH:mm:ss
	 *
	 * @param localDateTime /
	 * @return /
	 */
	public static LocalDateTime parseLocalDateTimeFormatyMdHms(String localDateTime) {
		return LocalDateTime.from(DFY_MD_HMS.parse(localDateTime));
	}

	public static void main(String[] args) {
		System.out.println(DateUtil.format("20230601"));
		;
	}
}