How to retrieve or store files dynamically to cpanel/server using java code

I purchased server space from goDaddy and got all the required things for a website to run. Now I created a web page and uploaded it in the cpanel public_html folder and could see my changes online. My question is, how to I make it dynamic?

How can I upload files from my website and store it in my server and view it in my cpanel? Is there any path that I should provide in java servlet such that the file gets stored? I am new to web development, kindly provide suggestions or references.