- git clone
- gradle bootRun
- access 'http://localhost:8080/download.xlsx'
- Prepare headerMap (key is Integer from 0, value is String list(into header name))
- Prepare contentMap (key is Integer from 0, value is Object list)
- Prepare sheetList (String list)
- Mapping (key is String(headers, contents, sheets), value is the above things)