Java -使用微秒获取unix纪元

long currentTimeMillis = System.currentTimeMillis();
long unixEpoch = currentTimeMillis / 1000;

import java.time.Instant;

public class Main {
    public static void main(String[] args) {
        Instant instant = Instant.now();
        long unixEpoch = instant.getEpochSecond();
        System.out.println(unixEpoch);
    }
}

import java.time.Clock;
import java.time.Duration;

public class Main {
    public static void main(String[] args) {
        Clock clock = Clock.systemUTC();
        Instant instant = clock.instant();
        long micros = Duration.between(Instant.EPOCH, instant).toNanos() / 1000;
        System.out.println(micros);
    }
}