兩種方式
第一種通過FilterRegistrationBean

 @Bean
 public FilterRegistrationBean filterRegistrationBean(){
    return new FilterRegistrationBean(errorPageFilter());
 }

@Bean
public Filter errorPageFilter(){
  ErrorPageFilter errorPageFilter = new ErrorPageFilter();
  ErrorPage notFind = new ErrorPage("/404");
  errorPageFilter.addErrorPages(notFind);
  return errorPageFilter;
}

第二種通過DelegatingFilterProxyRegistrationBean

@Bean
public DelegatingFilterProxyRegistrationBean delegatingFilterProxyRegistrationBean(){
  return new DelegatingFilterProxyRegistrationBean("errorPageFilter");
}

@Bean("errorPageFilter")
public Filter errorPageFilter(){
  ErrorPageFilter errorPageFilter = new ErrorPageFilter();
  ErrorPage notFind = new ErrorPage("/404");
  errorPageFilter.addErrorPages(notFind);
  return errorPageFilter;
}

二者都是繼承同一個(gè)父類AbstractFilterRegistrationBean，只是DelegatingFilterProxyRegistrationBean還實(shí)現(xiàn)了ApplicationContextAware，注入了ApplicationContext實(shí)例，用于查找指定的Filter實(shí)例，最終構(gòu)建的是一個(gè)代理Filter實(shí)例(DelegatingFilterProxy);FilterRegistrationBean中維護(hù)的是目標(biāo)Filter，結(jié)果都是將Filter注冊(cè)到ServletContext中，推薦使用FilterRegistrationBean。