1、设置绝对路径

#静态资源对外暴露的访问路径

file.staticAccessPath=/upload/**

#文件上传目录（注意Linux和Windows上的目录结构不同）

#file.uploadFolder=/home/upload/

file.uploadFolder=d://upload/

@Configuration

public class UploadFileConfig {

    @Value("${file.uploadFolder}")

    private String uploadFolder;

    @Bean

    MultipartConfigElement multipartConfigElement() {

        MultipartConfigFactory factory = new MultipartConfigFactory();

        factory.setLocation(uploadFolder);

        //文件最大

        factory.setMaxFileSize("5MB");

        // 设置总上传数据总大小

        factory.setMaxRequestSize("10MB");

        return factory.createMultipartConfig();

    }

}

@Configuration

public class UploadFilePathConfig extends WebMvcConfigurerAdapter {

    @Value("${file.staticAccessPath}")

    private String staticAccessPath;

    @Value("${file.uploadFolder}")

    private String uploadFolder;

    @Override

    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        registry.addResourceHandler(staticAccessPath).addResourceLocations("file:" + uploadFolder);

    }

}