一 使用註解

@Slf4j
@WebFilter(filterName = "authFilter", urlPatterns = "/*")
@Order(1) //順序
public class AuthFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        log.debug("start to auth request validate...111");
        HttpServletRequest req 
 
= (HttpServletRequest) request;
        String token = req.getHeader("token");
        if (token != null) {
        //    :TODO check token
            log.info("auth success");
            chain.doFilter(request, response);
        } else {
            log.err("auth failed");
        }
    }
}

@Slf4j
@EnableScheduling
@ServletComponentScan(basePackages 
 
= {"com.sanro.filter"}) //這一句就完成了配置
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
        log.debug("rest server start success.");
    }
}

二 手動配置

@Slf4j
@Component
public class AuthFilter implements
 
 Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        log.debug("start to auth request validate...111");
        HttpServletRequest req = (HttpServletRequest) request;
        String token = req.getHeader("token");
        if (token != null) {
        //    :TODO check token
            log.info("auth success");
            chain.doFilter(request, response);
        } else {
            log.err("auth failed");
        }
    }
}

@Configuration
public class FilterConfig {

    @Autowired
    private AuthFilter authFilter;

    @Bean
    public FilterRegistrationBean registerAuthFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(authFilter);
        registration.addUrlPatterns("/*");
        registration.setName("authFilter");//手動註冊進去
        registration.setOrder(1);  //值越小，Filter越靠前。
        return registration;
    }
    
    //如果有多個Filter，再寫一個public FilterRegistrationBean registerOtherFilter(){...}即可。
}