try {
//方法一：System.currentTimeMillis()
            long timeMillis1 = System.currentTimeMillis();
            //  TimeUnit
            TimeUnit.SECONDS.sleep(1);
            long timeMillis2 = System.currentTimeMillis();
            log.info("System.currentTimeMillis()以秒计的时间差：" + (timeMillis2 - timeMillis1) / 1000);


//方法二：System.nanoTime()
            long nanoTime1 = System.nanoTime();
            TimeUnit.SECONDS.sleep(1);
            long nanoTime2 = System.nanoTime();
            log.info("System.nanoTime()以秒计的时间差：" + (nanoTime2 - nanoTime1) / 1000000000.0);

//方法三：new Date().getTime()
            long startTime = new Date().getTime();
            // 线程睡眠
            Thread.sleep(1000);
            long endTime = new Date().getTime();
            log.info("Date以秒计的时间差：" + (endTime - startTime) / 1000);

//方法四：Instant.now()
            Instant inst1 = Instant.now();
            TimeUnit.SECONDS.sleep(1);
            Instant inst2 = Instant.now();
            log.info("Instant以秒计的时间差：" + Duration.between(inst1, inst2).getSeconds());

// 方法五：new StopWatch()
            StopWatch stopWatch = new StopWatch();
            stopWatch.start();
            Thread.sleep(1000);
            stopWatch.stop();
            log.info("StopWatch以秒计的时间差：" + stopWatch.getTime() / 1000);

// 方法六：new StopWatch()
            org.springframework.util.StopWatch watch = new org.springframework.util.StopWatch();
            watch.start("watcher");
            Thread.sleep(2000);
            watch.stop();
            log.info("StopWatch以秒计的时间差：" + watch.prettyPrint());
        } catch (InterruptedException e) {
            System.err.format("IOException: %s%n", e);
        }