Servlets :: Add RadioButton To HTML

My problem is my teacher told me that i have to add a radiobutton on html. According to radiobutton servlet has to choose write parameters on DB or File. And he wants me to add a method to do this work.

1)Get Parameters
2)Choose to write DB or File according to parameters
3)if it is DB create connection and do writing process
4)if it is file create file and do writing process.

Second piece of code should be removed. İnstead of this i have to use a single method. But i don't know how to do this(not writing code). Should i use another servlet or a class...

package GB;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;

[Code] ....