springboot如何获取相对路径文件夹下静态资源的方法

# 配置静态资源访问前缀
spring.mvc.static-path-pattern=*/**
# 配置静态资源路径，默认配置失效
spring.resources.static-locations=../upload

@Configuration
@EnableConfigurationProperties({ FileHanderProperties.class })
public class FileHandleConfig extends WebMvcConfigurerAdapter {
 
  @Autowired
  private FileHanderProperties fileHanderProperties;
 
  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler(fileHanderProperties.getResource())
        .addResourceLocations("file:" + fileHanderProperties.getFileDir()+"//");
    super.addResourceHandlers(registry);
  }
 
}