springboot使用過濾器，只要FilterRegistrationBean不需要web.xml配置。

Spring Boot 之FilterRegistrationBean --支持web Filter 排序的使用(轉)

只需配置中要注冊了bean（FilterRegistrationBean），就自動添加了過濾器

@Configuration
public class WebComponent2Config   {
    @Bean
    public FilterRegistrationBean filterDemo3Registration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(filterDemo3());
        registration.addUrlPatterns("/*");
        registration.addInitParameter("paramName", "paramValue");
        registration.setName("filterDemo3");
        registration.setOrder(6);
        return registration;
    }