StopWatch簡單的秒表，允許多個任務的計時，暴露每個命名任務的總運行時間和運行時間。隱藏使用System.currentTimeMillis（），提高應用程序代碼的可讀性並減少計算錯誤的可能性。
以下演示使用StopWatch記錄請求摘要日志信息：
@Slf4j public class PerformanceInteceptor implements HandlerInterceptor { private ThreadLocal<StopWatch> stopWatchThreadLocal = new ThreadLocal<>(); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { StopWatch sw = new StopWatch(); stopWatchThreadLocal.set(sw); sw.start(); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { stopWatchThreadLocal.get().stop(); stopWatchThreadLocal.get().start(); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { StopWatch sw = stopWatchThreadLocal.get(); sw.stop(); String method = handler.getClass().getSimpleName(); if (handler instanceof HandlerMethod) { String beanType = ((HandlerMethod) handler).getBeanType().getName(); String methodName = ((HandlerMethod) handler).getMethod().getName(); method = beanType + "." + methodName; } // sw.getTotalTimeMillis(), 總執行時間 //sw.getTotalTimeMillis() - sw.getLastTaskTimeMillis(), 執行方法體所需要的時間 log.info("{};{};{};{};{}ms;{}ms;{}ms", request.getRequestURI(), method, response.getStatus(), ex == null ? "-" : ex.getClass().getSimpleName(), sw.getTotalTimeMillis(), sw.getTotalTimeMillis() - sw.getLastTaskTimeMillis(), sw.getLastTaskTimeMillis()); stopWatchThreadLocal.remove(); } }
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