本文翻译自：Convert java.time.LocalDate into java.util.Date type
I want to convertjava.time.LocalDateintojava.util.Datetype.我想将java.time.LocalDate转换为java.util.Date类型。Because I want to set the date intoJDateChooser.因为我想将日期设置为JDateChooser。Or is there any date chooser that supportsjava.timedates?或者是否有支持java.time日期的日期选择器？
#1楼
参考：/question/1YCwP/将java-time-LocalDate转换为java-util-Date类型
#2楼
Date date = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());
假设您的日期选择器使用系统默认时区将日期转换为字符串。
#3楼
In order to create ajava.util.Datefrom ajava.time.LocalDate, you have to要从java.time.LocalDate创建java.util.Date，您必须这样做
add a time to theLocalDate为LocalDate添加时间interpret the date and time within a time zone解释时区内的日期和时间get the number of seconds / milliseconds sinceepoch获取自纪元以来的秒数/毫秒数create ajava.util.Date创建一个java.util.Date
The code might look as follows:代码可能如下所示：
LocalDate localDate = LocalDate.now();Date date = new Date(localDate.atStartOfDay(ZoneId.of("America/New_York")).toEpochSecond() * 1000);
#4楼
java.time has the Temporal interface which you can use to create Instant objects from most of the the time classes.java.time具有Temporal接口，您可以使用该接口从大多数时间类创建Instant对象。Instant represents milliseconds on the timeline in the Epoch - the base reference for all other dates and times.Instant表示Epoch中时间轴上的毫秒数 - 所有其他日期和时间的基准参考。
We need to convert the Date into a ZonedDateTime, with a Time and a Zone, to do the conversion:我们需要将Date转换为带有时间和区域的ZonedDateTime来进行转换：
LocalDate ldate = ...;Instant instant = Instant.from(ldate.atStartOfDay(ZoneId.of("GMT")));Date date = Date.from(instant);
#5楼
Here's a utility class I use to convert the newerjava.timeclasses tojava.util.Dateobjects and vice versa:这是我用来将较新的java.time类转换为java.util.Date对象的实用程序类，反之亦然：
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();}}
Edited based on @Oliv comment.根据@Oliv评论编辑。
#6楼
You can usejava.sql.Date.valueOf()method as:您可以使用java.sql.Date.valueOf()方法：
Date date = java.sql.Date.valueOf(localDate);
No need to add time and time zone info here because they are taken implicitly.无需在此处添加时间和时区信息，因为它们是隐式使用的。
See LocalDate to java.util.Date and vice versa simpliest conversion?请参阅LocalDate到java.util.Date，反之亦然最简单的转换？
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