How to get remote ip address when data get post through LB (Load Balancer)

In tomcat under conf/server.xml. Update below code

           prefix="localhost_access_log." suffix=".txt"
           pattern="%{X-Forwarded-For}i %h %l %u %t "%r" %s %b"    
resolveHosts="false" />

         

Java Code

The following Java code extracts the originating IP address of an HttpServletRequest object.

public final class HTTPUtils {

    private static final String HEADER_X_FORWARDED_FOR =

        "X-FORWARDED-FOR";

    public static String remoteAddr(HttpServletRequest request) {

        String remoteAddr = request.getRemoteAddr();

        String x;

        if ((x = request.getHeader(HEADER_X_FORWARDED_FOR)) != null) {

            remoteAddr = x;

            int idx = remoteAddr.indexOf(',');

            if (idx > -1) {

                remoteAddr = remoteAddr.substring(0, idx);

            }

        }

        return remoteAddr;

    }

}