springboot解决跨域问题和虚拟路径映射问题

@SpringBootConfiguration
public class SpringBootWebConfigurer implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry corsRegistry){
        //允许所有请求跨域操作
        corsRegistry.addMapping("/**")
                .allowCredentials(true)
                .allowedOriginPatterns("*")
                .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
                .allowedHeaders("*")
                .maxAge(3600);
    }
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
     //文件路径映射
     //addResourceHandler为虚拟访问路径
     //addResourceLocations里填本地真实路径("file:"别漏掉)
        registry.addResourceHandler("/upload/**").addResourceLocations("file:E:/Img/image/upload/");
        registry.addResourceHandler("/download/**").addResourceLocations("file:E:/Img/download/");
         }
}

新建一个类，里面内容填写以上代码。