Java8 LocalDateTime和Date相互转换

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很想要用Java的时间api，但有时候还是需要转换为Date. 二者的相互转换并不是一步到位那么简单，所以，还是需要记录一下转换的api

Date to LocalDateTime

Date todayDate = new Date();

LocalDateTime ldt = todayDate.toInstant()

        .atZone( ZoneId.systemDefault() )

        .toLocalDateTime();

System.out.println(ldt);

//2019-05-16T19:22:12.773

LocalDateTime to Date

LocalDateTime localDateTime = LocalDateTime.now();

Date date = Date.from( localDateTime.atZone( ZoneId.systemDefault()).toInstant());

System.out.println(date);

//Thu May 16 19:22:37 CST 2019

DateUtils

import java.time.Instant;

import java.time.LocalDate;

import java.time.LocalDateTime;

import java.time.ZoneId;

import java.util.Date;

public class DateUtils {

    public static Date asDate(LocalDate localDate) {

        return Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());

    }

    public static Date asDate(LocalDateTime localDateTime) {

        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());

    }

    public static LocalDate asLocalDate(Date date) {

        return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDate();

    }

    public static LocalDateTime asLocalDateTime(Date date) {

        return Instant.ofEpochMilli(date.getTime()).atZone(ZoneId.systemDefault()).toLocalDateTime();

    }

}