content: package com.java2nb.common.utils;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.servlet.http.HttpServletRequest;
  
  public class IPUtils {
  	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
  
  	/**
  	 * 获取IP地址
  	 * 
  	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
  	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
  	 */
  	public static String getIpAddr(HttpServletRequest request) {
  
  		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.getRemoteAddr();
  		}
  		return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
  	}
  
  }
  