javaUtil类

public static boolean isPhone(String phone){
//        phone = isNull(phone);
        Pattern regex = Pattern
                .compile("^((13[0-9])|(15[^4,\\D])|(18[0-9]))\\d{8}$");
        Matcher matcher = regex.matcher(phone);
        boolean isMatched = matcher.matches();
        return isMatched;
    }
    
    /**
     * 产生随机4位数
     * @return 1568
     */
    public static String getRandomNum(){
        String[] num = new String[] { "0","1","2", "3", "4", "5", "6", "7", "8", "9"};  
        List list = Arrays.asList(num);  
        Collections.shuffle(list);  
        StringBuilder sb = new StringBuilder();  
        for (int i = 0; i < list.size(); i++) {  
            sb.append(list.get(i));  
        }  
        String afterShuffle = sb.toString();  
        String result = afterShuffle.substring(3, 7);
        return result;
    }
    
    /**
     * UUID 主键
     * @return 主键
     */
    public static String getId(){
        UUID uuid = UUID.randomUUID();
        String uid = uuid.toString();
        return uid;
    }