方法一：

import java.time.Duration;
import java.time.LocalDateTime;

LocalDateTime beginTime = LocalDateTime.now();
Thread.sleep(1000);
Long opetime = Duration.between(beginTime, LocalDateTime.now()).toMillis();
System.out.println(opetime);

方法二：

Long beginTime = System.currentTimeMillis();
Thread.sleep(1000);
Long opetime = System.currentTimeMillis() - beginTime;
System.out.println(opetime);

方法三：

import com.google.common.base.Stopwatch;

Stopwatch stopwatchGroup = Stopwatch.createStarted();
// 业务代码
long groupExecuteTime = stopwatchGroup.stop().elapsed(TimeUnit.SECONDS);
LOGGER.info("耗时：{} 秒", groupExecuteTime);