问题：

springboot自定义拦截器里自动装配一直为null

解决：

不要在addInterceptors里手动new一个interceptor 改成下面这样

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Bean
    public MyInterceptor myInterceptor() {
        return new MyInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        String[] addPath = {"/**"};
        registry.addInterceptor(myInterceptor()).addPathPatterns(addPath);
    }

}