拦截器

• 注册拦截器

@Configuration
public class WebConfiguration extends WebMvcConfigurerAdapter {

    /**
     * 定义拦截器调用链
     *
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 日志追踪
        registry.addInterceptor(new TraceLogInterceptor()).addPathPatterns("/**");
        // 性能
        registry.addInterceptor(new PerformanceInterceptor()).addPathPatterns("/**");
        // 业务线
        registry.addInterceptor(new MerchantInterceptor()).addPathPatterns("/**");
        super.addInterceptors(registry);
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.configureMessageConverters(converters);
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.DisableCircularReferenceDetect
        );

        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
        converters.add(fastJsonHttpMessageConverter);
    }

}

• 定义拦截器

public class TraceLogInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        MDC.put(TraceConstant.TRACE_KEY, UUID.randomUUID().toString().replace("-", ""));
        String orderNo = request.getParameter(TraceConstant.ORDER_NO);
        if (StringUtils.isBlank(orderNo)) {
            orderNo = request.getParameter(TraceConstant.TRANS_ID);
        }
        MDC.put(TraceConstant.ORDER_NO, orderNo);
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        MDC.remove(TraceConstant.TRACE_KEY);
        MDC.remove(TraceConstant.ORDER_NO);
    }
}

另外对比SpringMVC 的拦截器,在SpringMVC.xml配置

 <mvc:interceptors>

        <!-- 日志追踪拦截器 -->
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <mvc:exclude-mapping path="/static/**"/>
            <bean class="com.sq.dispatcher.spring.TraceLogInterceptor"/>
        </mvc:interceptor>