Spring: how to pass objects from filters to controllers

Question

I\'m trying to add a Filter that creates an object that is then to be used inside a controller in a Spring Boot application.

The idea is to use the Filter as a \"cen

Answer 1

you can use ServletRequest.setAttribute(String name, Object o);

for example

@RestController
@EnableAutoConfiguration
public class App {

    @RequestMapping("/")
    public String index(HttpServletRequest httpServletRequest) {
        return (String) httpServletRequest.getAttribute(MyFilter.passKey);
    }

    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }

    @Component
    public static class MyFilter implements Filter {

        public static String passKey = "passKey";

        private static String passValue = "hello world";

        @Override
        public void init(FilterConfig filterConfig) throws ServletException {

        }

        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
                throws IOException, ServletException {
            request.setAttribute(passKey, passValue);
            chain.doFilter(request, response);
        }

        @Override
        public void destroy() {

        }
    }
}