Spring中StopWatch的使用

StopWatch简单的秒表，允许多个任务的计时，暴露每个命名任务的总运行时间和运行时间。隐藏使用System.currentTimeMillis（），提高应用程序代码的可读性并减少计算错误的可能性。

以下演示使用StopWatch记录请求摘要日志信息：

@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(), 总执行时间
        //sw.getTotalTimeMillis() - sw.getLastTaskTimeMillis(), 执行方法体所需要的时间

        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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