获取真实的客户端IP地址

1.获取真实的客户端IP地址

    

request.getRemoteAddr() ，这种方法在大部分情况下都是有效的。但是在通过了Apache,Squid等反向代理软件就不能获取到客户端的真实IP地址了。

/**
 * 获取客户端的Ip地址
 *
 * @return IP地址
 */
public static String getIpAddress() {

  HttpServletRequest request = getRequest();
  if (request == null) {
    return null;
  }
  String ip = request.getHeader("X-Forwarded-For");

  //FIXME
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
    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();
    }
  } else if (ip.length() > 15) {
    String[] ips = ip.split(",");
    for (int index = 0; index < ips.length; index++) {
      String strIp = (String) ips[index];
      if (! ("unknown".equalsIgnoreCase(strIp))) {
        ip = strIp;
        break;
      }
    }
  }
  return ip;
}