Spring HandlerInterceptorAdapter postHandle有保证吗？

Question

我目前有两个处理类似功能的拦截器.我想合并这些.

一个拦截器是访问请求记录器,它显示登录用户,会话ID和请求的URL.

另一个拦截器是一个进程时间记录器.

访问记录器为了记录必须记录的所有记录,请在preHandle方法中记录请求.我们的想法是,不管之后发生了什么(例如,例外),确切的访问请求都会存在.

但是,由于其性质,进程时间记录器必须登录postHandle方法.

为了合并这个功能,我必须将所有内容都移动到一个postHandle方法中.但是,如果在某处发生异常,我可能会丢失一些日志记录,尤其是在应用程序代码中尚未正确处理的异常.

这些考虑是否有任何保证或说明？

Answer 1

您可以考虑合并afterCompletion中的逻辑,即使在处理程序方法抛出异常的情况下也会调用该逻辑.一个很好的在线示例

public class RequestProcessingTimeInterceptor extends HandlerInterceptorAdapter {

    private static final Logger logger = LoggerFactory
            .getLogger(RequestProcessingTimeInterceptor.class);

    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {
        long startTime = System.currentTimeMillis();
        logger.info("Request URL::" + request.getRequestURL().toString()
                + ":: Start Time=" + System.currentTimeMillis());
        request.setAttribute("startTime", startTime);
        //if returned false, we need to make sure 'response' is sent
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        System.out.println("Request URL::" + request.getRequestURL().toString()
                + " Sent to Handler :: Current Time=" + System.currentTimeMillis());
        //we can add attributes in the modelAndView and use that in the view page
    }

    @Override
    public void afterCompletion(HttpServletRequest request,
            HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        long startTime = (Long) request.getAttribute("startTime");
        logger.info("Request URL::" + request.getRequestURL().toString()
                + ":: End Time=" + System.currentTimeMillis());
        logger.info("Request URL::" + request.getRequestURL().toString()
                + ":: Time Taken=" + (System.currentTimeMillis() - startTime));
    }
 }