自备LocalDateTime工具类

package cn.zytao.taosir.common.utils;

import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public class DateTimeUtils {

    public static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("HHmmss");
    public static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd");
    public static final DateTimeFormatter DATETIME_FORMATTER =  DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
    
    /**
     * 获取当前系统时间
     * @return
     */
    public static LocalTime getLocalTime() {
        return LocalTime.now();
    }
    
    /**
     * 获取当前系统日期
     * @return
     */
    public static LocalDate getLocalDate() {
        return LocalDate.now();
    }
    
    /**
     * 获取当前系统日期时间
     * @return
     */
    public static LocalDateTime getLocalDateTime() {
        return LocalDateTime.now();
    }
    
    /**
     * 获取当前系统时间字符串
     * @return
     */
    public static String getLocalTimeString() {
        return LocalTime.now().format(TIME_FORMATTER);
    }
    
    /**
     * 获取当前系统日期字符串
     * @return
     */
    public static String getLocalDateString() {
        return LocalDate.now().format(DATE_FORMATTER);
    }
    
    /**
     * 获取当前系统日期时间字符串
     * @return
     */
    public static String getLocalDateTimeString() {
        return LocalDateTime.now().format(DATETIME_FORMATTER);
    }
    
    /**
     * 字符串转LocalTime
     * @param time
     * @return
     */
    public static LocalTime  string2LocalTime(String time) {
        return LocalTime.parse(time, TIME_FORMATTER);
    }
    
    /**
     * 字符串转LocalDate
     * @param date
     * @return
     */
    public static LocalDate  string2LocalDate(String date) {
        return LocalDate.parse(date, DATE_FORMATTER);
    }
    
    /**
     * 字符串转LocalDateTime
     * @param dateTime
     * @return
     */
    public static LocalDateTime string2LocalDateTime(String dateTime) {
        return LocalDateTime.parse(dateTime, DATETIME_FORMATTER);
    }
    
    /**
     * Date转LocalDateTime
     * @param date
     * @return
     */
    public static LocalDateTime date2LocalDateTime(Date date) {
        Instant instant = date.toInstant();//An instantaneous point on the time-line.(时间线上的一个瞬时点。)
        ZoneId zoneId = ZoneId.systemDefault();//A time-zone ID, such as {@code Europe/Paris}.(时区)
        LocalDateTime localDateTime = instant.atZone(zoneId).toLocalDateTime();
        return localDateTime;
    }
    
    /**
     * Date转LocalDate
     * @param date
     * @return
     */
    public static LocalDate date2LocalDate(Date date) {
        Instant instant = date.toInstant();//An instantaneous point on the time-line.(时间线上的一个瞬时点。)
        ZoneId zoneId = ZoneId.systemDefault();//A time-zone ID, such as {@code Europe/Paris}.(时区)
        LocalDate localDate = instant.atZone(zoneId).toLocalDate();
        return localDate;
    }
    
    /**
     * Date转LocalDate
     * @param date
     * @return
     */
    public static LocalTime date2LocalTime(Date date) {
        Instant instant = date.toInstant();//An instantaneous point on the time-line.(时间线上的一个瞬时点。)
        ZoneId zoneId = ZoneId.systemDefault();//A time-zone ID, such as {@code Europe/Paris}.(时区)
        LocalTime localTime = instant.atZone(zoneId).toLocalTime();
        return localTime;
    }
    
     /**
     * LocalDateTime转换为Date
     * @param localDateTime
     */
    public static Date localDateTime2Date(LocalDateTime localDateTime){
        ZoneId zoneId = ZoneId.systemDefault();
        ZonedDateTime zdt = localDateTime.atZone(zoneId);//Combines this date-time with a time-zone to create a  ZonedDateTime.
        Date date = Date.from(zdt.toInstant());
        return date;
    }
}