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:

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

 import java.net.UnknownHostException;

/**
 * Simple Java program to find IP Address of localhost. This program uses
 * InetAddress from java.net package to find IP address.
 *
 */
public class IPTest { 

public static void main(String args[]) throws UnknownHostException {

    InetAddress addr = InetAddress.getLocalHost();

    //Getting IPAddress of localhost - getHostAddress return IP Address
    // in textual format
    String ipAddress = addr.getHostAddress();

    System.out.println("IP address of localhost from Java Program: " + ipAddress);

    //Hostname
    String hostname = addr.getHostName();
    System.out.println("Name of hostname : " + hostname);     
}
}

Output:

IP address of localhost from Java Program: 190.12.209.123
Name of hostname : PCLOND3433

Answer 3

In case, you are trying to get the IP-address for Dev-environment then you can use this:-

public String processRegistrationForm(HttpServletRequest request)
{
    String appUrl = request.getScheme() + "://"+ request.getLocalAddr();
    return appUrl;
}

The request.getLocalAddr() will return the IP-address of the request receiving system.

Hope it helps.

Answer 4

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();
}