Spring 4 autowire to Filter - spring

Question

I build app with Spring 4.1.6, I have all config in java class. My AppConfig:
#Configuration
#EnableWebMvc
#ComponentScan(basePackages = "pl.wrweb.springrest")
public class AppConfig extends WebMvcConfigurerAdapter {
#Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
}
#Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
#Bean(name = "messageSource")
public ReloadableResourceBundleMessageSource getMessageSource() {
ReloadableResourceBundleMessageSource resource = new ReloadableResourceBundleMessageSource();
resource.setBasename("classpath:messages");
resource.setDefaultEncoding("UTF-8");
return resource;
}
}
AppInitializer:
public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
public void onStartup(ServletContext container) throws ServletException {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(AppConfig.class);
ctx.setServletContext(container);
ServletRegistration.Dynamic servlet = container.addServlet("dispatcher", new DispatcherServlet(ctx));
servlet.setLoadOnStartup(1);
servlet.addMapping("/");
container.addFilter("customFilter", new DelegatingFilterProxy(new CustomFilter())).addMappingForUrlPatterns(null, true, "/*");
}
#Override
protected String[] getServletMappings() {
return new String[0];
}
#Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[0];
}
#Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[0];
}
}
and my CustomFilter:
#Configuration
#EnableWebSecurity
public class CustomFilter implements Filter {
#Autowired
UserService userService;
public void init(FilterConfig fc) throws ServletException {
}
public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException {
HttpServletRequest httpServletRequest = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
if (httpServletRequest.getRequestURI().contains("/employee/")) {
String token = httpServletRequest.getHeader("x-token");
System.out.println("token " + token);
Long userId = TokenUtils.getUserNameFromToken(token);
System.out.println("ObjectStore.token " + ObjectStore.token);
if (token!=null) {
if (token.equals(String.valueOf(ObjectStore.token))) {
int index = ObjectStore.token++;
ObjectStore.token = index+1;
System.out.println("index " +ObjectStore.token + "token " + token);
response.setHeader("x-token", String.valueOf(ObjectStore.token));
fc.doFilter(req, response);
} else {
response.sendError(HttpStatus.FORBIDDEN.value());
fc.doFilter(req, response);
return;
}
} else {
response.sendError(HttpStatus.FORBIDDEN.value());
fc.doFilter(req, response);
return;
}
} else {
fc.doFilter(req, res);
}
}
public void destroy() {
}
}
Everything works fine but I can't inject userService and it's null, I need this to check token in request.

Answer 1

You should use Code as this!
private UserService userService;
and then add this code
public void init(FilterConfig fc) throws ServletException {
ApplicationContext app = WebApplicationContextUtils.getRequiredWebApplicationContext(fc.getServletContext());
userService= app.getBean(UserService.class);
}