主要用来对servlet filter进行自定义，比如设置order。

先写一个普通的filter：

public class FilterDemo implements Filter {      private final Logger log = LoggerFactory.getLogger(FilterDemo.class);          @Override      public void destroy() {          log.info("" + getClass() + " destroy");        }        @Override      public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {          log.info( " doFilter " );          arg2.doFilter(arg0, arg1);        }        @Override      public void init(FilterConfig arg0) throws ServletException {          log.info("" + getClass() + " init");        }    }

 

配置如下：

@Configuration  public class WebComponent2Config   {        @Bean      public FilterRegistrationBean filterDemo3Registration() {          FilterRegistrationBean registration = new FilterRegistrationBean();          registration.setFilter(filterDemo3());          registration.addUrlPatterns("/*");           registration.setName("filterDemo3");          registration.setOrder(6);          return registration;      }        @Bean      public FilterRegistrationBean filterDemo4Registration() {          FilterRegistrationBean registration = new FilterRegistrationBean();          registration.setFilter(filterDemo4());          registration.addUrlPatterns("/*");          registration.setName("filterDemo4");          registration.setOrder(7);          return registration;      }        @Bean      public Filter filterDemo3() {          return new FilterDemo3();      }        @Bean      public Filter filterDemo4() {          return new FilterDemo4();      }    }