How to build a graph from a user file?

Question

Java

Hello.
What I want: The user uploads a file with data and a graph is built based on this data.
How to implement something like this?
I ran into the fact that I can’t get into the method where you need to fill in the chart; transfer data from the user ; I
plan to draw graphics using Google Charts

Answer 1

The user uploads a file with data and a graph is built based on this data. How to implement something like this?

Your Captain Obvious