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Get Users IP Address

import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Main extends HttpServlet {   protected void service(HttpServletRequest request, HttpServletResponse response)       throws ServletException, IOException {     response.setContentType("text/html;charset=UTF-8");     PrintWriter out = response.getWriter();     // Print out the IP address of the caller     out.println(request.getRemoteAddr());   } }