java 擷取用戶端IP位址

public static String getRemoteAddr(HttpServletRequest req) {
        String ip = req.getHeader("X-Forwarded-For");
        if (StringUtils.isNotBlank(ip)) {
            String[] ips = StringUtils.split(ip, ',');
            if (ips != null) {
                for (String tmpip : ips) {
                    if (StringUtils.isBlank(tmpip)) continue;
                    tmpip = tmpip.trim();
                    if (isIPAddr(tmpip) && !tmpip.startsWith("10.") && !tmpip.startsWith("192.168.")
                            && !"127.0.0.1".equals(tmpip)) {
                        return tmpip.trim();
                    }
                }
            }
        }
        ip = req.getHeader("x-real-ip");
        if (isIPAddr(ip)) return ip;
        ip = req.getRemoteAddr();
        if (ip.indexOf('.') == -1) ip = "127.0.0.1";
        return ip;
    }