Finding user ip address

Question

I have created web application using JSF 2.0. I have hosted it on hosting site and the server of the hosting site is based in US.

My client want the details of the u

Answer 1

A more versatile solution

Improved version of the accepted answer that works even if there are multiple IP addresses in the X-Forwarded-For header:

/**
 * Gets the remote address from a HttpServletRequest object. It prefers the 
 * `X-Forwarded-For` header, as this is the recommended way to do it (user 
 * may be behind one or more proxies).
 *
 * Taken from https://stackoverflow.com/a/38468051/778272
 *
 * @param request - the request object where to get the remote address from
 * @return a string corresponding to the IP address of the remote machine
 */
public static String getRemoteAddress(HttpServletRequest request) {
    String ipAddress = request.getHeader("X-FORWARDED-FOR");
    if (ipAddress != null) {
        // cares only about the first IP if there is a list
        ipAddress = ipAddress.replaceFirst(",.*", "");
    } else {
        ipAddress = request.getRemoteAddr();
    }
    return ipAddress;
}