自定义filter

1. 继承Filter
2. 继承OncePerRequestFilter
   • 每次请求只过滤一次

@Configuration
public class FilterConfig {
    /**
     * 拦截器注册
     * 
     * @return
     */
    @Bean
    public FilterRegistrationBean myFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());
        registration.addUrlPatterns("/a/*");// 拦截路径
        registration.setName("MyFilter");// 拦截器名称
        registration.setOrder(1);// 顺序
        return registration;
    }

    /**
     * 拦截器注册
     * 
     * @return
     */
    @Bean
    public FilterRegistrationBean myOncePerRequestFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyOncePerRequestFilter());
        registration.addUrlPatterns("/*");// 拦截路径
        registration.setName("MyOncePerRequestFilter");// 拦截器名称
        registration.setOrder(2);// 顺序
        return registration;
    }
}