How to port java applications for the web?

Question

Java

There is a cool application that I would like to port to the browser so that it works both from mobile and from under everything. I myself have no experience with JAVA, so please tell me which side is better to approach? For example, is it possible to run java code from under platforms like node.js? (I immediately thought about it, since the application has work with sockets) Or what to choose?
I have access to the source codes, I also have experience in programming, I want to understand the best direction for working.

Answer 1

Contact a Java expert.
NodeJS - a finger to the sky.
First of all, highlight the parts in the application that relate to the user interface.
If the communication between the GUI and the rest of the application is over TCP/IP, then consider yourself very lucky.
You will need to rewrite the GUI from scratch.
If not, you will have to rewrite everything from scratch.

Answer 2

NodeJS is server-side JavaScript, nothing more. If the application works 100% on a mobile device, i.e. does not have any backend, then rewrite from scratch. If there is a backend, then the situation is a little simpler - you need to implement Rest services (if they are not) in the backend and a client web application that will use these services.