Systems of any scale are holding data in one form or the other (Database, files, images, videos etc). With more and more data being churned out every day, there is also a need to be able to export data from the Applications. The exported data should be made available in the format that users can easily view with bunch of other tools. Excel is one of those dominating tool that people love for its multipurpose application. In this article, we will learn how to leverage Apache POI to generate Excel sheet with various customization options.