클라이언트의 실제 IP를 얻으십시오

public class IPUtil { 
    public static String getIpAddr(HttpServletRequest request) { 
        String ip = request.getHeader("X-Real-IP"); 
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { 
         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.getRemoteAddr();  if (ip! = null && ip.indexof ( ",")! = -1) { ip = ip. substring(0,ip.indexOf(",")); 
        } 
        IP 반환; 
    } 
}