Secure server-side output from a client-side app

Question

I converted a local application to a Java applet for data security ¹ but I cannot figure out how to output information to a file. I am inputting files by a URL object but do not know how to output data to a file on the server.

1. secure in that the person running the program in supervised conditions cannot keep it and run it for someone else (it is a survey I am piloting).

Is there an easy way to do this?

Answer 1

Applets run on the client, not on the server, so an applet can't do this, period. What it can do is send data to a service of some kind on your server, which can then turn around and write the data to a file.