How to get client Ip Address in Java HttpServletRequest

Question

I am trying to develop a Java web application (Servlet) which I need to get clients IP address.

Following is my code so far:

String ipAddress =  request.getRemoteAddr(); 

In this case most of the time I get the 'Default gateway address' (147.120.1.5). Not my machine IP address(174.120.100.17).

String ipAddress = request.getHeader("X-FORWARDED-FOR");   if (ipAddress == null) {       ipAddress = request.getRemoteAddr();   }  

In this case most of the time I get the 'Default gateway address' (147.120.1.5). Not my machine IP address (174.120.100.17).

InetAddress IP=InetAddress.getLocalHost(); System.out.println(IP.getHostAddress()); 

In this case I got the server IP Address (147.120.20.1).

My IP address in 147.120.100.17. Now I don't know how to get the real client IP address.

Thank you very much.

Answer 1

Try this one,

String ipAddress = request.getHeader("X-FORWARDED-FOR");   if (ipAddress == null) {       ipAddress = request.getRemoteAddr();   } 

reference : http://www.mkyong.com/java/how-to-get-client-ip-address-in-java/

Answer 2

Try this one. for all condition

private static final String[] HEADERS_TO_TRY = {             "X-Forwarded-For",             "Proxy-Client-IP",             "WL-Proxy-Client-IP",             "HTTP_X_FORWARDED_FOR",             "HTTP_X_FORWARDED",             "HTTP_X_CLUSTER_CLIENT_IP",             "HTTP_CLIENT_IP",             "HTTP_FORWARDED_FOR",             "HTTP_FORWARDED",             "HTTP_VIA",             "REMOTE_ADDR" };  private String getClientIpAddress(HttpServletRequest request) {     for (String header : HEADERS_TO_TRY) {         String ip = request.getHeader(header);         if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {             return ip;         }     }      return request.getRemoteAddr(); }