spring boot 添加静态资源映射

@Configuration
//@EnableMongoRepositories
public class WeaselWebMVCConfig  implements WebMvcConfigurer{

    @Value("${convert_pdfroot}")
    private String convert_pdfroot;
    
    @Bean
    public LogInterceptor getLogInterceptor() {
        return new LogInterceptor();
    }
    
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(getLogInterceptor());
        WebMvcConfigurer.super.addInterceptors(registry);
    }
    
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        // registry.addResourceHandler("/upload/**").addResourceLocations("file:D:/wekuku_root/upload/"
        // ); //+ uploadProperties.getPath());
        registry.addResourceHandler("/viewroot/**")
                .addResourceLocations("file:" + convert_pdfroot + "/");

    }