private static String getRemoteIp(HttpServletRequest request) {
        //x-forwarded-for:代表客户端，也就是HTTP的请求端真实的IP，只有在通过了HTTP代理或者负载均衡服务器时才会添加该项
        String ip = request.getHeader("x-forwarded-for");
        //Proxy-Client-IP和WL-Proxy-Client-IP: 只有在Apache（Weblogic Plug-In Enable）+WebLogic搭配下出现，其中“WL”就是WebLogic的缩写
        //访问路径是:Client -> Apache WebServer + Weblogic http plugin -> Weblogic Instances
        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();
        }
//        ip = "61.51.253.90";
//        ip = "218.25.19.153";
        //0:0:0:0:0:0:0:1: IPV6的形式,win7下可能会出现
        return  "0:0:0:0:0:0:0:1".equals(ip)?  "127.0.0.1" : ip;
    }

始终返回127.0..0.1,用natapp映射外网地址也是127.0.0.1