Springboot配置上传文件功能

这两天用springboot开发上传照片功能

一直报下面的错误（找不到对应的multipartResolver实现）
Unable to process parts as no multi-part configuration has been provided

试了搜来的各种配置，都没有生效
估计别人的情况跟我的不太一样，最后简单粗暴地手动注入bean成功了

配置类
@Configuration
public class MyConfig implements WebMvcConfigurer{

@Bean("multipartResolver")
public MultipartResolver configMultipartResolver() {
    CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
    commonsMultipartResolver.setMaxUploadSize(104857600);
    commonsMultipartResolver.setMaxInMemorySize(4096);
    return commonsMultipartResolver;
}

}

注意：需要引入jar
compile group: ‘commons-fileupload’, name: ‘commons-fileupload’, version: ‘1.3.3’