Create a button -> Add File Download Listener to it (mention the name of file; content type of file; define the method in backing bean)
// method
// sample page example
// paint the file however you like by iterating through the rows
http://www.techartifact.com/blogs/2013/08/generate-excel-file-in-oracle-adf-using-apache-poi.html#sthash.ex7znOTY.dpbs
// method
// sample page example
// paint the file however you like by iterating through the rows
http://www.techartifact.com/blogs/2013/08/generate-excel-file-in-oracle-adf-using-apache-poi.html#sthash.ex7znOTY.dpbs
Sample code:
https://drive.google.com/file/d/1m1bvkrEF4qOr9ZCn1UVMaK1HLyWqorwR/view?usp=sharing