Java8中ZonedDateTime与Timestamp的相互转换

admin

       Jdk8中java.time包中的新的日期时间API类中时间范围示意图：可以很清晰的看出ZonedDateTime相当于LocalDateTime+ZoneId，ZonedDateTime是用来处理时区相关的时间。

3 U5 W  x' B: g" h: N) k& ?1. ZonedDateTime->时间戳

复制代码
package com.mkyong.jdbc;

import java.sql.Timestamp;
import java.time.ZonedDateTime;

public class TimeExample1 {

    public static void main(String[] args) {

        ZonedDateTime now = ZonedDateTime.now();

        // 1. ZonedDateTime to TimeStamp
        Timestamp timestamp = Timestamp.valueOf(now.toLocalDateTime());

        // 2. ZonedDateTime to TimeStamp , no different
        Timestamp timestamp2 = Timestamp.from(now.toInstant());

        System.out.println(now); // 2019-06-19T14:12:13.585294800+08:00[Asia/Kuala_Lumpur]

        System.out.println(timestamp); // 2019-06-19 14:12:13.5852948

        System.out.println(timestamp2); // 2019-06-19 14:12:13.5852948

    }
}

输出量:
! a4 b; @- }. X: [6 t  t
/ [: b# Z* E' m, u' h2.时间戳-> ZonedDateTime
) b3 a/ v+ R- A+ Y& R$ E

复制代码
package com.mkyong;

import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class TimeExample2 {

    public static void main(String[] args) {

        Timestamp timestamp = Timestamp.from(Instant.now());

        LocalDateTime localDateTimeNoTimeZone = timestamp.toLocalDateTime();

        ZonedDateTime zonedDateTime1 = localDateTimeNoTimeZone.atZone(ZoneId.of("+08:00"));

        ZonedDateTime zonedDateTime2 = localDateTimeNoTimeZone.atZone(ZoneId.of("Asia/Kuala_Lumpur"));

        ZonedDateTime zonedDateTime3 = localDateTimeNoTimeZone.atZone(ZoneId.systemDefault());

        ZonedDateTime zonedDateTime4 = localDateTimeNoTimeZone.atZone(ZoneId.of("-08:00"));

        System.out.println(timestamp); // 2019-06-19 14:08:23.4458984

        System.out.println(zonedDateTime1); // 2019-06-19T14:08:23.445898400+08:00

        System.out.println(zonedDateTime2); // 2019-06-19T14:08:23.445898400+08:00[Asia/Kuala_Lumpur]

        System.out.println(zonedDateTime3); // 2019-06-19T14:08:23.445898400+08:00[Asia/Kuala_Lumpur]

        System.out.println(zonedDateTime4); // 2019-06-19T14:08:23.445898400-08:00

    }

}

输出量:
# l8 w4 z$ @5 h