Some one have a simple example in xojo for create excel file in web app. I already buy the license

You may want to check out the sample projects which come with the MBS plugins, see inside of the XL folder.

We’ve used it quite a bit in our applications and if you need speed importing large quantity of data, then there is nothing better than MBS and the Libxl plugin. Unbelievably fast.

The LibXL examples are independent of the GUI, so it works also in console and web.

see list of examples here.