Spring Boot Request映射不适用于Filter

Question

我正在开发一个SpringBoot项目，其中有@RestController和FilterRegistrationBean。我添加的过滤器可以工作，但是在@RestController和@RequestMapping中配置的url不能工作。当我请求url时，响应代码是200，但是没有显示任何内容。当我移除过滤器时，RequestMapping工作正常。为什么？(我访问的网址是http://localhost:8080/simple)下面是我的代码。SessionTokenFilter:

public class SessionTokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        Map<String, String[]> param_map = servletRequest.getParameterMap();
        for(String param_key: param_map.keySet()){
            System.out.println("Parameter name: "+param_key);
        }
        System.out.println("Get a request from the browser!");
    }
}

AppConfiguration.java

@Configuration
public class AppConfiguration {
    @Bean
    public FilterRegistrationBean<SessionTokenFilter> registerFilter(){
        FilterRegistrationBean filterBean = new FilterRegistrationBean();
        filterBean.setFilter(new SessionTokenFilter());
        filterBean.setUrlPatterns(Arrays.asList("/*"));
        return filterBean;
    }
}

ApiRouters.java

@RestController
public class ApiRouters {
    @RequestMapping(value="/simple", method= RequestMethod.GET)
    public ResponseEntity simple(){
        System.out.println("Simple url matched!");
        return ResponseEntity.ok().body("Ok");
    }
}

主入口类:

@SpringBootApplication
public class ApiApplication {
    public static void main(String[] args){
        SpringApplication.run(ApiApplication.class);
    }
}

Answer 1

原因是应该调用过滤器链。当我在过滤器类中添加代码时，一切正常。

filterChain.doFilter(servletRequest, servletResponse);