2.5 需要注册

3.0 不需要注册

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2.5

public class SomeFilter implements Filter {    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {        System.out.println("执行过滤器方法");        filterChain.doFilter(servletRequest, servletResponse);    }}

 在配置类中

@Beanpublic FilterRegistrationBean
     
       xxx() {　　FilterRegistrationBean
      
        registrationBean = new FilterRegistrationBean<>();　　registrationBean.setFilter(new SomeFilter());　　registrationBean.addUrlPatterns("/first/*");　　return registrationBean;}
      
     

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3.0

@WebFilter("/*")public class SomeFilter implements Filter {    @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {        System.out.println("执行过滤器方法");        filterChain.doFilter(servletRequest, servletResponse);    }}

@SpringBootApplication@ServletComponentScan("com.abc.filter")public class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}