Java日期工具类操作字符串Date和LocalDate互转-Java开发

这篇文章主要介绍了Java日期工具类操作字符串Date和LocalDate互转，文章首先通过需要先引入坐标展开主题的相关内容介绍，需要的朋友可以参一下

字符串转Date

//字符串转Date
Date dateTime = DateUtil.parseDate("2022-04-06");
System.out.println(dateTime);

Date转字符串

//Date转字符串不指定format格式，默认yyyy-MM-dd HH:mm:ss
String dateStr = DateUtil.date2Str(new Date());
System.out.println(dateStr);
//Date转字符串指定格式
String dateStr2 = DateUtil.date2Str("yyyy/MM/dd",new Date());
System.out.println(dateStr2);

字符串转LocalDate

//字符串转LocalDate
LocalDate localDate = DateUtil.parseLocalDate("2022-04-06");
System.out.println(localDate);

Date转LocalDate

//Date转LocalDate
LocalDate localDate = DateUtil.date2LocalDate(new Date());
System.out.println(localDate);

LocalDate转字符串

//LocalDate转Str
String localDateStr = DateUtil.localDate2Str(LocalDate.now());
System.out.println(localDateStr);

两个日期的时间差

String beginDateStr = "2022-02-01 22:33:23";
Date beginDate = DateUtil.parse(beginDateStr);
String endDateStr = "2022-03-10 23:33:23";
Date endDate = DateUtil.parse(endDateStr);
//相差天数(37)
long betweenDay = DateUtil.between(beginDate, endDate, DateUnit.DAY);
System.out.println(betweenDay);
//格式化时间差(37天1小时)
String formatBetween = DateUtil.formatBetween(beginDate, endDate, BetweenFormater.Level.HOUR);
System.out.println(formatBetween);

一天的开始和结束时间

String dateStr = "2022-04-07 10:33:23";
Date date = DateUtil.parse(dateStr);

//一天的开始时间：2022-04-07 00:00:00
Date beginOfDay = DateUtil.beginOfDay(date);
System.out.println(beginOfDay);

//一天的结束时间：2022-04-07 23:59:59
Date endOfDay = DateUtil.endOfDay(date);
System.out.println(endOfDay);

工具类

/**
 * <p>基于hutool的日期工具类增强</p>
 *
 * @author zjq
 * @date 2021/04/07
 */
public class DateUtil extends cn.hutool.core.date.DateUtil {

    private static final String[] PARSE_PATTERNS = {
            "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM",
            "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
            "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};

    public static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("HH:mm:ss");
    public static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
    public static final DateTimeFormatter DATETIME_FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * 字符串转date类型
     *
     * @param dateStr
     * @return
     */
    public static Date parseDate(Object dateStr) {
        if (ObjectUtils.isNull(dateStr)) {
            return null;
        }
        if (dateStr instanceof Double) {
            return org.apache.poi.ss.usermodel.DateUtil.getJavaDate((Double) dateStr);
        }
        return parse(dateStr.toString(), PARSE_PATTERNS);
    }

    /**
     * Date类型转字符串
     *
     * @param date
     * @return yyyy-MM-dd HH:mm:ss
     */
    public static String date2Str(Date date) {
        return date2Str(null, date);
    }

    /**
     * Date类型转字符串
     *
     * @param format
     * @param date
     * @return
     */
    public static String date2Str(String format, Date date) {
        if (ObjectUtils.isNull(date)) {
            return null;
        }
        SimpleDateFormat dateFormat = StrUtil.isNotBlank(format) ?new SimpleDateFormat(format):
                new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(date);
    }

    /**
     * 字符串转LocalTime类型
     *
     * @param dateStr
     * @return
     */
    public static LocalTime parseLocalTime(Object dateStr) {
        if (ObjectUtils.isNull(dateStr)) {
            return null;
        }
        if (dateStr instanceof Double) {
            return date2LocalTime(parseDate(dateStr));
        }
        return LocalTime.parse(dateStr.toString(), TIME_FORMATTER);
    }

    /**
     * Date转LocalTime
     *
     * @param date
     * @return
     */
    public static LocalTime date2LocalTime(Date date) {
        if (null == date) {
            return null;
        }
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalTime();
    }

    /**
     * LocalTime转Str
     *
     * @param localTime
     * @return HH:mm:ss
     */
    public static String localTime2Str(LocalTime localTime) {
        return localTime2Str(null, localTime);
    }

    /**
     * LocalTime转str
     *
     * @param format    格式
     * @param localTime
     * @return
     */
    public static String localTime2Str(String format, LocalTime localTime) {
        if (null == localTime) {
            return null;
        }
        DateTimeFormatter formatter = StrUtil.isBlank(format) ?
                TIME_FORMATTER : DateTimeFormatter.ofPattern(format);
        return localTime.format(formatter);
    }
    /**
     * 字符串转LocalDate类型
     *
     * @param dateStr
     * @return
     */
    public static LocalDate parseLocalDate(Object dateStr) {
        if (ObjectUtils.isNull(dateStr)) {
            return null;
        }
        if (dateStr instanceof Double) {
            return date2LocalDate(parseDate(dateStr));
        }
        return LocalDate.parse(dateStr.toString(), DATE_FORMATTER);
    }
   /**
     * Date转LocalDate
     *
     * @param date
     * @return
     */
    public static LocalDate date2LocalDate(Date date) {
        if (null == date) {
            return null;
        }
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    }
    /**
     * LocalDate转Str
     *
     * @param localDate
     * @return
     */
    public static String localDate2Str(LocalDate localDate) {
        return localDate2Str(null, localDate);
    }

    /**
     * LocalDate转Str
     *
     * @param format    格式
     * @param localDate
     * @return
     */
    public static String localDate2Str(String format, LocalDate localDate) {
        if (null == localDate) {
            return null;
        }
        DateTimeFormatter formatter = StrUtil.isBlank(format) ?
                DATE_FORMATTER : DateTimeFormatter.ofPattern(format);
        return localDate.format(formatter);
    }
    /**
     * 字符串转LocalDateTime类型
     *
     * @param dateStr
     * @return
     */
    public static LocalDateTime parseLocalDateTime(Object dateStr) {
        if (ObjectUtils.isNull(dateStr)) {
            return null;
        }
        if (dateStr instanceof Double) {
            return date2LocalDateTime(parseDate(dateStr));
        }
        return LocalDateTime.parse(dateStr.toString(), DATETIME_FORMATTER);
    }

    /**
     * Date转LocalDateTime
     *
     * @param date
     * @return
     */
    public static LocalDateTime date2LocalDateTime(Date date) {
        if (null == date) {
            return null;
        }
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
    }
    /**
     * LocalDate转Str
     *
     * @param localDateTime
     * @return
     */
    public static String localDateTime2Str(LocalDateTime localDateTime) {
        return localDateTime2Str(null, localDateTime);
    }
    /**
     * LocalDate转Str
     *
     * @param format
     * @param localDateTime
     * @return
     */
    public static String localDateTime2Str(String format, LocalDateTime localDateTime) {
        if (null == localDateTime) {
            return null;
        }
        DateTimeFormatter formatter = StrUtil.isBlank(format) ?
                DATETIME_FORMATTER : DateTimeFormatter.ofPattern(format);
        return localDateTime.format(formatter);
    }
}

到此这篇关于Java日期工具操作字符串Date和LocalDate互转的文章就介绍到这了,更多相关Date和LocalDate互转内容请搜索编程学习网以前的文章希望大家以后多多支持编程学习网！