protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String remoteUser = request.getRemoteUser(); if (remoteUser != null) { System.out.println("Remote user: " + remoteUser); } else { System.out.println("No remote user information available."); } }
if (request.getRemoteUser().equals("admin")) { // Perform administrative tasks } else { // Display error message }This example checks if the remote user is an administrator and performs administrative tasks if true, or displays an error message if false. Package library: javax.servlet.http.HttpServletRequest is part of the Java Servlet API, which is a standard extension to the Java platform that provides a way to create web applications.