一共分两步
　　1-创建拦截器
　　2-注册拦截器

1-创建拦截器
@Slf4j
@Component
public class HttpInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("---------------------开始进入请求地址拦截----------------------------");
        String url = request.getRequestURL().toString();
        Map<String, String[]> parameterMap = request.getParameterMap();
        log.info("request start url:{}, param{}",url,parameterMap.toString());
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("--------------处理请求完成后视图渲染之前的处理操作---------------");
        String url = request.getRequestURL().toString();
        Map<String, String[]> parameterMap = request.getParameterMap();
        log.info("request finish url:{}, param{}",url,parameterMap.toString());
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("---------------视图渲染之后的操作-------------------------0");
        String url = request.getRequestURL().toString();
        Map<String, String[]> parameterMap = request.getParameterMap();
        log.info("request exception url:{}, param{}",url,parameterMap.toString());
    }
}

2-注册拦截器

@Configuration
@EnableWebMvc
@ComponentScan//组件扫描
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new HttpInterceptor()).addPathPatterns("/**").excludePathPatterns("/emp/toLogin","/emp/login","/js/**","/css/**","/images/**");
    }
}