How to retrieve the IP address of the logged-in user in…

You can obtain the IP address of the logged-in user in Java by using the following method:

1. Getting IP address using Servlet: In Servlet, you can retrieve the user’s IP address through the getRemoteAddr() method of the HttpServletRequest object. For example:
2. Retrieve the remote IP address from the request.
3. Obtaining the IP address using the Spring framework: If you are using the Spring framework, you can retrieve the user’s IP address by injecting the HttpServletRequest object. For example:
4. @Autowired
   private HttpServletRequest request;

   public String obtainIpAddress() {
   return request.getRemoteAddr();
   }

Please note that the IP address obtained using the above method may be the IP address of a proxy server, not the actual IP address of the end user. If you need to obtain the real IP address, you can consider using the X-Forwarded-For or X-Real-IP fields in the HTTP headers of the proxy server. For example, in a Servlet, you can obtain the real IP address as follows:

String ipAddress = request.getHeader("X-Forwarded-For");
if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
    ipAddress = request.getHeader("X-Real-IP");
}
if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
    ipAddress = request.getRemoteAddr();
}