JSP obtains the client IP address the method _jsp programming

This article illustrates how JSP obtains the client IP address. Share to everyone for your reference, specific as follows:

public static String getipaddr (HttpServletRequest request) { 
  String IP = request.getheader ("x-forwarded-for");
  if (IP = null | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP) {
   IP = request.getheader ("Proxy-client-ip");
  }
  if (IP = null | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP) {
   IP = request.getheader ("Wl-proxy-client-ip");
  }
  if (IP = null | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP) {
   IP = request.getheader ("Http_client_ip");
  }
  if (IP = null | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP) {
   IP = request.getheader ("http_x_forwarded_for");
  }
  if (IP = null | | ip.length () = = 0 | | "Unknown". Equalsignorecase (IP) {
   IP = request.getremoteaddr ();
  }
  return IP;
}

I hope this article will help you with JSP program design.