How to realize file upload and download without dependence by resty upload

This article mainly introduces "resty upload how to achieve file upload and download without dependence". In daily operation, I believe that many people have doubts about how to achieve file upload and download without dependence on resty upload. The editor has consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the question of "how to achieve file upload and download without dependence on resty upload". Next, please follow the editor to study!

1. File upload a. Take a look at the attributes of @ FIEL annotation / * when uploading a file, use this annotation to set file-related parameters * / @ Retention (RetentionPolicy.RUNTIME) @ Target (ElementType.METHOD) @ Documentedpublic @ interface FILE {String dir () default "; / / whether the directory uploaded by the file boolean overwrite () default false;// encounters whether the file with the same name is overwritten, which is suitable for the client to control the file name Class