[Spring Boot] Servlet, Servlet-filter 설정

ServletRegistrationBean, FilterRegistrationBean, ServletListenerRegistrationBean을 이용해서 등록할 수 있다.

1. 필터 생성 및 등록

LogFilter1

    public class LogFilter1 extends GenericFilterBean {
        private static final Logger log = LoggerFactory.getLogger(LogFilter1.class);

        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            log.info("이것은 필터1입니다.");
            filterChain.doFilter(servletRequest, servletResponse);
        }
    }

LogFilter2

    public class LogFilter2 extends GenericFilterBean {
        private static final Logger log = LoggerFactory.getLogger(LogFilter2.class);

        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            log.info("이것은 필터2입니다.");
            filterChain.doFilter(servletRequest, servletResponse);
        }
    }

    @Configuration
    public class FilterConfiguration {

        @Bean
        public FilterRegistrationBean logFilter1RegistrationBean(){
            FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
            filterRegistrationBean.setFilter(new LogFilter1());
            filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
            filterRegistrationBean.setOrder(2);
            return filterRegistrationBean;
        }

        @Bean
        public FilterRegistrationBean logFilter2RegistrationBean(){
            FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
            filterRegistrationBean.setFilter(new LogFilter2());
            filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
            filterRegistrationBean.setOrder(1);
            return filterRegistrationBean;
        }
    }

2. Servlet 생성 및 등록

LogServlet1

    public class LogServlet1 extends HttpServletBean {
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            resp.getWriter().write("LogServlet1");
        }
    }

LogServlet2

    public class LogServlet2 extends HttpServletBean {
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            resp.getWriter().write("LogServlet2");
        }
    }

    @Configuration
    public class ServletConfiguration {

        @Bean
        public ServletRegistrationBean logServlet1RegistrationBean(){
            ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
            servletRegistrationBean.setServlet(new LogServlet1());
            servletRegistrationBean.setUrlMappings(Arrays.asList("/log1"));
            return servletRegistrationBean;
        }

        @Bean
        public ServletRegistrationBean logServlet2RegistrationBean(){
            ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
            servletRegistrationBean.setServlet(new LogServlet2());
            servletRegistrationBean.setUrlMappings(Arrays.asList("/log2"));
            return servletRegistrationBean;
        }
    }

SpringBoot를 띄운 후, /log1 /log2 에 각각 요청을 보내면 Servlet과 Filter가 정상 동작하는 것을 볼 수 있다.

    2019-11-05 21:58:35.055  INFO 65987 --- [nio-8080-exec-6] com.nhn.corn.sample.filter.LogFilter2    : 이것은 필터2입니다.
    2019-11-05 21:58:35.055  INFO 65987 --- [nio-8080-exec-6] com.nhn.corn.sample.filter.LogFilter1    : 이것은 필터1입니다.
    2019-11-05 21:58:39.393  INFO 65987 --- [nio-8080-exec-7] com.nhn.corn.sample.filter.LogFilter2    : 이것은 필터2입니다.
    2019-11-05 21:58:39.393  INFO 65987 --- [nio-8080-exec-7] com.nhn.corn.sample.filter.LogFilter1    : 이것은 필터1입니다.