获取IP工具类

   /**
     * 获取请求IP
     *
     * @param request
     * @return
     * @throws Exception
     */
    public static String getIpAddr(HttpServletRequest request) throws Exception {

        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.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        // 如果是多级代理，那么取第一个ip为客户端ip
        if (ip != null && ip.contains(",")) {
            ip = ip.substring(0, ip.indexOf(",")).trim();
        }

        return ip;
    }

    /**
     * 正则获取字符串中的ip地址
     * @param ipstring
     * @return
     */
    public static List<String> getIps(String ipstring) {
        String regEx = "((2[0-4]\\d|25[0-5]|[01]?\\d\\d?)\\.){3}(2[0-4]\\d|25[0-5]|[01]?\\d\\d?)";
        List<String> ips = new ArrayList<String>();
        Pattern p = Pattern.compile(regEx);
        Matcher m = p.matcher(ipstring);
        while (m.find()) {
            String result = m.group();
            ips.add(result);
            return ips;
        }
        return ips;
    }