[java] client ip 구하기

package com.web.cms.core.common.util;

import jakarta.servlet.http.HttpServletRequest;
import lombok.extern.slf4j.Slf4j;

import java.net.InetAddress;
import java.net.UnknownHostException;

@Slf4j
public class NetworkUtil
{
	public static String getClientIp( HttpServletRequest request ) throws UnknownHostException
	{
		String ip = request.getHeader( "X-Forwarded-For" );

		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "Proxy-Client-IP" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "WL-Proxy-Client-IP" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "HTTP_CLIENT_IP" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "HTTP_X_FORWARDED_FOR" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "X-Real-IP" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "X-RealIP" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getHeader( "REMOTE_ADDR" );
		}
		if( ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip ) )
		{
			ip = request.getRemoteAddr();
		}

		//로컬 다이렉트 접속
		if( ip.equals( "0:0:0:0:0:0:0:1" ) || ip.equals( "127.0.0.1" ) )
		{
			InetAddress address = InetAddress.getLocalHost();
			ip = address.getHostName() + "/" + address.getHostAddress();
		}

		return ip;
	}
}

static 으로 만들어서 request 만 있으면 아무데서나 사용