That's because Spring isn't managing your PagePopulationInterceptor instance. You are creating it yourself in the below (拦截器内使用@Autowired时出现了null,这是由于你的spring对象注入时机在你的拦截器之后了)
public @Override void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new PagePopulationInterceptor()); }
change that to
@Bean public PagePopulationInterceptor pagePopulationInterceptor() { return new PagePopulationInterceptor(); } public @Override void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(pagePopulationInterceptor()); }
in this way, Spring will manage the lifecycle of the PagePopulationInterceptor instance since it's generated from a @Bean method. Spring will scan it for @Autowired targets and inject them. This assumes that PagePopulationInterceptor is in a package to be @ComponentScaned.