java获取注册ip

             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();
             }
             System.out.println("ip:"+ip);