@Autowired injection service is not available in the Springboot interceptor

Make the following changes.

The first is WebMvcConfiguration :

@Configurationpublicclassextends WebMvcConfigurerAdapter {    @Bean    publicauthenticationInterceptor() {        returnnewAuthenticationInterceptor();    }    @Override    publicvoidaddInterceptors(InterceptorRegistry registry) {        registry.addInterceptor(authenticationInterceptor()).addPathPatterns("/**");    }}

Then you need to make the springboot scan current Interceptor , that is, add comments on the class @Component .

@Component Public classAuthenticationinterceptorImplementsHandlerinterceptor {@Autowired    PrivateUserService UserService;@Override     Public Boolean Prehandle(HttpServletRequest request, httpservletresponse response, Object O)throwsException {User user = UserService.getById(ID); }@Override     Public void Posthandle(HttpServletRequest request, httpservletresponse response, Object O, Modelandview modelandview)throwsException {}@Override     Public void aftercompletion(HttpServletRequest request, httpservletresponse response, Object O, Exception e)throwsException {}}

@Autowired injection service is not available in the Springboot interceptor