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/

配置上传文件的目录，也可以在这里设置上传文件的大小

@Configuration
public class UploadFileConfig {
    @Value("${file.uploadFolder}")
    private String uploadFolder;
    @Bean
    MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setLocation(uploadFolder);
        //文件最大
        factory.setMaxFileSize("5MB");
        // 设置总上传数据总大小
        factory.setMaxRequestSize("10MB");
        return factory.createMultipartConfig();
2、设置虚拟路径，访问绝对路径下资源
@Configuration
public class UploadFilePathConfig extends WebMvcConfigurerAdapter {
    @Value("${file.staticAccessPath}")
    private String staticAccessPath;
    @Value("${file.uploadFolder}")
    private String uploadFolder;
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler(staticAccessPath).addResourceLocations("file:" + uploadFolder);
这时就可以通过访问 http://localhost:8080/upload/xxx.jpg访问d://upload/下的资源。