ip正则验证

 /**

     * 正则判断ip是否合法

     * 

     * @author yangliang

     * @version CreateTime：2013-11-3 下午04:38:29

     * @param @param ipAddress

     * @param @return

     * @return boolean

     */

    private boolean validateIp(String ipAddress)

    {

        String ip = "^(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|[1-9])\\." + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\." + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)\\." + "(1\\d{2}|2[0-4]\\d|25[0-5]|[1-9]\\d|\\d)$";

        Pattern pattern = Pattern.compile(ip);

        Matcher matcher = pattern.matcher(ipAddress);

        return matcher.matches();

    }