Mega Code Archive
Get Remote Host from Servlet Request
<![CDATA[
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html");
PrintWriter out = res.getWriter();
// Get the client's hostname
String remoteHost = req.getRemoteHost();
out.println("remoteHost:"+remoteHost);
// 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") &&
!host.endsWith(".sd"));
}
}
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<servlet><servlet-name>MyServletName</servlet-name>
<servlet-class>MyServlet</servlet-class>
</servlet>
<servlet-mapping><servlet-name>MyServletName</servlet-name>
<url-pattern>/index.html</url-pattern>
</servlet-mapping>
</web-app>
]]>