[FIXED] how to call a method in a servlet from another class

Issue

I have to check if a user is using a mobile device.

I can do it with this code

String ua=request.getHeader("User-Agent");

In order to use request I need a servlet (do I?), so I created one and I put that code inside doPost/doGet method.

Since those are void methods, how can I get a return value to know if a user is using a mobile?

Probably my approach is not the right one.

My goal is to get from that servlet (assuming that I need just a servlet) a value that tells me if a user is using a mobile device.

Solution

One way is to use session and keep the String ua in the session

Either in the doPost() or in doGet()

String ua=request.getHeader("User-Agent");
Httpsession session=request.getSession();
session.setAttribute("ua",ua);

Now where ever you want to check just do

session.getAttribute("ua");

As long as the session exists, the value will be present.

Answered By - SpringLearner
Answer Checked By - Robin (JavaFixing Admin)