How to create my own filter with Spring MVC?

Question

I use Spring MVC (4.0.1) as a backend for rest services and angularjs as frontend.

every request to my server backend has a http-header with a session id

I c

Answer 1

Your approach looks correct.

Once I have used something similar to following (Removed most of the lines and kept it simple).

public class MvcDispatcherServletInitializer  extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        super.onStartup(servletContext);

        EnumSet dispatcherTypes = EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.ERROR);

        FilterRegistration.Dynamic monitoringFilter = servletContext.addFilter("monitoringFilter", MonitoringFilter.class);
        monitoringFilter.addMappingForUrlPatterns(dispatcherTypes, false, "/api/admin/*");
    }

    @Override
    protected Class[] getRootConfigClasses() {
        return new Class[] { WebMvcConfig.class };
    }

    @Override
    protected Class[] getServletConfigClasses() {
        return null;
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

}

Also you need a custom filter looks like below.

public class CustomXHeaderFilter implements Filter {

        @Override
        public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
            HttpServletRequest request = (HttpServletRequest) req;
            HttpServletResponse response = (HttpServletResponse) res;

            String xHeader = request.getHeader("X-Auth-Token");
            if(YOUR xHeader validation fails){
                //Redirect to a view
                //OR something similar
                return;
            }else{
                //If the xHeader is OK, go through the chain as a proper request
                chain.doFilter(request, response);
            }

        }

        @Override
        public void destroy() {
        }

        @Override
        public void init(FilterConfig arg0) throws ServletException {
        }

    }

Hope this helps.

Additionally you can use FilterRegistrationBean if you Spring Boot. It does the same thing (I think so) which FilterRegistration.Dynamic does.