Get Remote Host from Servlet Request : Request « Servlet « Java Tutorial

import javax.servlet.*;
import javax.servlet.http.*;

public class MyServlet extends HttpServlet {

  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {
    PrintWriter out = res.getWriter();

    // Get the client's hostname
    String remoteHost = req.getRemoteHost();

    // See if the client is allowed
    if (! isHostAllowed(remoteHost)) {
      out.println("Access <BLINK>denied</BLINK>");
    else {
      out.println("Access granted");
      // Display download links, etc...

  // Disallow hosts ending with .cu, .ir, .iq, .kp, .ly, .sy, and .sd.
  private boolean isHostAllowed(String host) {
    return (!host.endsWith(".cu") &&
            !host.endsWith(".ir") &&
            !host.endsWith(".iq") &&
            !host.endsWith(".kp") &&
            !host.endsWith(".ly") &&
            !host.endsWith(".sy") &&
<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"

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25.12.1.Print Request Headers for a Servlet
25.12.2.Get Servlet Request Parameter
25.12.3.Get Remote User and display welcome message
25.12.4.Get Users IP Address
25.12.5.Get Remote Host from Servlet Request
25.12.6.Request parsing and encoding utility methods