2000字代码教你怎么用Java获取当前的时间戳

 

在本教程中，我们将学习如何以各种方式在 java 中获取当前时间戳。 让我们跳入JDK 8 和更早版本 jdk的正确示例。

import java.sql.Timestamp; public class CurrentTimestampExample1 { public static void main(String[] args) { long timestampInMillies = System.currentTimeMillis(); Timestamp timestamp = new Timestamp(timestampInMillies); System.out.println("timestamp now : "+timestamp); } }

其他六种方式：

第一种：

import java.time.LocalDateTime; import java.time.format.DateTimeFormatter; public class CurrentTimestampExample7 { public static void main(String[] args) { LocalDateTime localDateTime = LocalDateTime.now(); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss SSS"); String timestamp = formatter.format(localDateTime); System.out.println("timestamp now : " + timestamp); } }

第二种：

import java.time.ZoneId; import java.time.ZonedDateTime; import java.time.format.DateTimeFormatter; public class CurrentTimestampExample6 { public static void main(String[] args) { ZoneId zoneId = ZoneId.systemDefault(); ZonedDateTime localDateTime = ZonedDateTime.now(zoneId); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss SSS"); String timestamp = formatter.format(localDateTime); System.out.println("timestamp now : " + timestamp); } }

第三种：

import java.time.Instant; public class CurrentTimestampExample5 { public static void main(String[] args) { Instant instant = Instant.now(); System.out.println("timestamp now : " + instant); } }

第四种：

import java.sql.Timestamp; import java.time.Instant; public class CurrentTimestampExample4 { public static void main(String[] args) { long timeInMillis = System.currentTimeMillis(); Timestamp timestamp = new Timestamp(timeInMillis); Instant instant = timestamp.toInstant(); System.out.println("timestamp now : " + instant); } }

第五种：

import java.text.SimpleDateFormat; import java.util.Date; public class CurrentTimestampExample2 { public static void main(String[] args) { SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date dateNow = new Date(); String timestampNow = simpleDateFormat.format(dateNow); System.out.println("timestamp now : " + timestampNow); } }

第六种：

import java.time.Instant; import java.util.Date; public class CurrentTimestampExample2 { public static void main(String[] args) { Date dateNow = new Date(); Instant instant = dateNow.toInstant(); System.out.println("timestamp now : " + instant); } }