目标

实现一个自定义过滤器，在所有请求进来时输出点儿信息

实现过滤器

实现一个自定义过滤器，在所有请求进行业务处理前，在控制台输出请求Id和请求Url

@Configuration
@EnableWebMvc
public class WebConfiguration {
    public static class MyFilter implements Filter {

        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            HttpServletRequest request = (HttpServletRequest) servletRequest;
            System.out.println(STR."RequestId: \{request.getRequestId()}，请求方式:\{request.getRequestURI()}");
            filterChain.doFilter(servletRequest, servletResponse);
        }
    }
}

注册过滤器

@Configuration
public class FilterConfig {

    @Bean
    public FilterRegistrationBean<WebConfiguration.MyFilter> myFilterFilterRegistrationBean(){
        FilterRegistrationBean<WebConfiguration.MyFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(new WebConfiguration.MyFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.setName("myFilter");
        return filterRegistrationBean;
    }
}