import org.apache.tomcat.util.http.fileupload.FileUpload; //导入依赖的package包/类
@Bean
MultipartConfigElement multipartConfigElement() {
    // spring-config
    MultipartConfigFactory factory = new MultipartConfigFactory();
    factory.setMaxFileSize(System.getProperty("yaio.server.maxfilesize", "128kb"));
    factory.setMaxRequestSize(System.getProperty("yaio.server.maxrequestsize", "128kb"));
    MultipartConfigElement config = factory.createMultipartConfig();

    // tomcat-config
    FileUploadBase tomcatConfig = new FileUpload();
    tomcatConfig.setFileSizeMax(config.getMaxFileSize());
    tomcatConfig.setSizeMax(config.getMaxFileSize());

    return config;
}