java 计算耗时毫秒数的方法：
StopWatch stopWatch = new StopWatch("下载文件耗时");
stopWatch.start();
....//各种下载耗时操作
stopWatch.stop();
log(LogLevel.WARN, "readFiles 耗时 {} ms", stopWatch.getTotalTimeMillis());
java 计算耗时毫秒数的方法：
StopWatch stopWatch = new StopWatch("下载文件耗时");
stopWatch.start();
....//各种下载耗时操作
stopWatch.stop();
log(LogLevel.WARN, "readFiles 耗时 {} ms", stopWatch.getTotalTimeMillis());
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