统计时间差JAVA

统计时间差，确认到分秒微秒

long date1 = System.currentTimeMillis();
long date2 = System.currentTimeMillis();
Calendar c = Calendar.getInstance();
c.setTimeInMillis(date2 -date1);
logger.info("耗时: " + c.get(Calendar.MINUTE) + "分 " + c.get(Calendar.SECOND) + "秒 " + c.get(Calendar.MILLISECOND) + " 微秒");