打印代码执行时间

1.

Stopwatch stopwatch = Stopwatch.createStarted();
// 业务代码
 stopwatch.stop();
 log.info("运行时间：" + stopwatch.elapsed(TimeUnit.MILLISECONDS) + "毫秒");

2.

Long startTime = System.currentTimeMillis();
// 业务代码
log.info("耗时：{}",System.currentTimeMillis() - startTime);