//用来判断ip是否合法

public boolean checkIp(String tempIp) {
        String regex = "(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]?\\d)){3}";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(tempIp);
        return m.matches();
    }