[Java] IP 주소 검색

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public String getClientIP(HttpServletRequest request) {
	String ip = request.getHeader("X-Forwarded-For");
	
	if (ip == null) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null) {
			ip = request.getHeader("HTTP_CLIENT_IP");
		}
		if (ip == null) {
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		if (ip == null) {
			ip = request.getRemoteAddr();
		}
	
	return ip;
}