获取请求的IP地址

来源：互联网发布：2017年java的就业前景编辑：程序博客网时间：2024/05/18 00:01

/**
* 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 参考文章：
* http://developer.51cto.com/art/201111/305181.htm
*
* 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
* 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
*
* 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
* 192.168.1.100
*
* 用户真实IP为： 192.168.1.110
*
* @param request
* @return
*/
public static String getIpAddress(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.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.getRemoteAddr();
  }
  return ip;
}

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