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如何用Java获取当前时间戳？
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如何用Java获取当前时间戳？
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);
}
}
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其他六种方式：
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);
}
}
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);
}
}
import java.time.Instant;
public class CurrentTimestampExample5 {
public static void main(String[] args) {
Instant instant = Instant.now();
System.out.println("timestamp now : " + instant);
}
}
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);
}
}
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);
}
}
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);
}
}
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