Button to upload csv file vaadin 8

Vaadin 6 / 7 / 8
1

I need the button in my UI to DOWNLOAD csv file. Vaadin 8. On click I am to choose path of the file and choose file.

2

In Vaadin 8 there is Upload component

https://vaadin.com/docs/v8/framework/components/components-upload

There is also extended version in Directory which behaves even more like a button.

https://vaadin.com/directory/component/uploadbutton-add-on

Choose the one which fits your needs.