IPUtils获取IP地址的一个工具类

import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

@Slf4j
public class IPUtils {

        private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
        public static String getIpAddr() {
        HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
                String ip = null;
                try {
                    ip = request.getHeader("x-forwarded-for");
                        if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                                ip = request.getHeader("Proxy-Client-IP");
                        }
                if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                                ip = request.getHeader("WL-Proxy-Client-IP");
                        }
                        if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                                ip = request.getHeader("HTTP_CLIENT_IP");
                        }
                        if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
                        }
                        if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                                ip = request.getRemoteAddr();
                        }
                } catch (Exception e) {
                        logger.error("IPUtils ERROR ", e);
                }
                return ip;
        }
}