SpringBoot之Web原生组件注入（Servlet、Filter、Listener）

1、使用注解@ServletComponentScan + 三大组件注解（@WebServlet、@WebFilter、@WebListener）
启动类

@ServletComponentScan(basePackages = "com.test.config")
@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        ConfigurableApplicationContext run = SpringApplication.run(DemoApplication.class, args);
    }
}

Filter自定义类

@WebFilter(urlPatterns={"/css/*","/images/*"})
public class MyFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

    }
    @Override
    public void destroy() {

    }
}

2、使用注解@Configuration+@Bean + RegistrationBean

@Configuration
public class MyRegistConfig {

    @Bean
    public ServletRegistrationBean myServlet(){
        MyServlet myServlet = new MyServlet();
        return new ServletRegistrationBean(myServlet,"/myurl");
    }

    @Bean
    public FilterRegistrationBean myFilter(){
        MyFilter myFilter = new MyFilter();
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/myurl","/css/*"));
        return filterRegistrationBean;
    }

    @Bean
    public ServletListenerRegistrationBean myListener(){
        MySwervletContextListener mySwervletContextListener = new MySwervletContextListener();
        return new ServletListenerRegistrationBean(mySwervletContextListener);
    }
}