SpringBoot使用HandlerInterceptor拦截器

编写一个拦截器，实现HandlerInterceptor接口

/**
 * TimerInterceptor
 *
 * @author jlin
 * @date 2019-05-30 09:19
 * @Description
 */
@Component
@Slf4j
public class TimerInterceptor implements HandlerInterceptor {
    /**
     * This implementation always returns {@code true}.
     *
     * @param request
     * @param response
     * @param handler
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.debug("收到请求-->{}", request.getRequestURI());
        request.setAttribute("startTime", System.currentTimeMillis());
        return true;
    }

    /**
     * 控制器方法抛不抛异常都会被调用
     *
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        Long startTime = (Long) request.getAttribute("startTime");
        log.debug("请求耗时-->url:{}-->time:{},", request.getRequestURI(), (System.currentTimeMillis() - startTime));
    }
}

编写一个类，继承WebMvcConfigurerAdapter抽象类，将其放入Spring容器中，然后重写addInterceptors()方法，并调用给的参数InterceptorRegistry.addInterceptor()把自己编写的那个拦截器作为参数加进去。

/**
 * WebConfig
 *
 * @author jlin
 * @date 2019-05-29 16:12
 * @Description
 */
@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private TimerInterceptor timerInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(timerInterceptor);
    }
}