JAVA获取IP地址工具类

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 = 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) || "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);
      }
      //使用代理，则获取第一个IP地址
      if(StringUtils.isNotEmpty(ip) && ip.length() > 15) {
        if(ip.indexOf(",") > 0) {
          ip = ip.substring(0, ip.indexOf(","));
        }
      }
      return ip;
    }
}