JAva取得ユーザipアドレス

package com.tonglifang.common.utils;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletRequest;

/**
 * IP  
 * @author liangkesai
 * @date 2018/8/13 12:42 
 */
public class IPUtils {
	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);

	/**
	 *   IP  
	 *   Nginx       ，      request.getRemoteAddr()  IP  
	 *              ，X-Forwarded-For       ，    IP  ，X-Forwarded-For     unknown   IP   ，    IP  
	 */
	public static String getIpAddr(HttpServletRequest request) {
    	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);
        }
        
//        //    ，      IP  
//        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
//			if(ip.indexOf(",") > 0) {
//				ip = ip.substring(0, ip.indexOf(","));
//			}
//		}
        
        return ip;
    }
	
}