Friday, May 24, 2013

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;
    }

}

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