java获取真实的ip地址

直接上代码，获取请求主机的IP地址，如果通过代理进来，则透过防火墙获取真实IP地址

 public class IPUtil {

     private static final Logger logger = LogManager.getLogger(IPUtil.class);

     /**
      * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
      *
      * @param request
      * @return
      * @throws IOException
      */
     public final static String getIpAddress(HttpServletRequest request) throws IOException {
         // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址

         String ip = request.getHeader("X-Forwarded-For");
         if (logger.isInfoEnabled()) {
             logger.info("getIpAddress(HttpServletRequest) - X-Forwarded-For - String ip=" + ip);
         }

         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 (logger.isInfoEnabled()) {
                     logger.info("getIpAddress(HttpServletRequest) - Proxy-Client-IP - String ip=" + ip);
                 }
             }
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                 ip = request.getHeader("WL-Proxy-Client-IP");
                 if (logger.isInfoEnabled()) {
                     logger.info("getIpAddress(HttpServletRequest) - WL-Proxy-Client-IP - String ip=" + ip);
                 }
             }
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                 ip = request.getHeader("HTTP_CLIENT_IP");
                 if (logger.isInfoEnabled()) {
                     logger.info("getIpAddress(HttpServletRequest) - HTTP_CLIENT_IP - String ip=" + ip);
                 }
             }
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                 ip = request.getHeader("HTTP_X_FORWARDED_FOR");
                 if (logger.isInfoEnabled()) {
                     logger.info("getIpAddress(HttpServletRequest) - HTTP_X_FORWARDED_FOR - String ip=" + ip);
                 }
             }
             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                 ip = request.getRemoteAddr();
                 if (logger.isInfoEnabled()) {
                     logger.info("getIpAddress(HttpServletRequest) - getRemoteAddr - String ip=" + ip);
                 }
             }
         } 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;
     }
 }