随机生成身份证号码

　  //程序入口　　　public static void main ( String[] args )
　　 {
        Test t = new Test();
        for (int i = 0; i < 100; i++)//随机生成100个身份证号码
        {
            System.out.println(t.getRandomID();　　　　 }　　 }

/**
     * 获取随机生成的身份证号码
     *
     * @author mingzijian
     * @return
     */
    public String getRandomID() {
        String id = "420222199204179999";
        // 随机生成省、自治区、直辖市代码 1-2
        String provinces[] = { "11", "12", "13", "14", "15", "21", "22", "23",
                "31", "32", "33", "34", "35", "36", "37", "41", "42", "43",
                "44", "45", "46", "50", "51", "52", "53", "54", "61", "62",
                "63", "64", "65", "71", "81", "82" };
        String province = randomOne(provinces);
        // 随机生成地级市、盟、自治州代码 3-4
        String city = randomCityCode(18);
        // 随机生成县、县级市、区代码 5-6
        String county = randomCityCode(28);
        // 随机生成出生年月 7-14
        String birth = randomBirth(20, 40);
        // 随机生成顺序号 15-17(随机性)
        Random rd=new Random();
        String no = rd.nextInt(10)+""+rd.nextInt(10)+""+rd.nextInt(10);
        // 随机生成校验码 18
        String checks[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9","X" };
        String check = randomOne(checks);
        // 拼接身份证号码
        id = province + city + county + birth + no + check;
        return id;
    }  

    /**
     * 从String[] 数组中随机取出其中一个String字符串
     *  new Random().nextInt(10)————>>区间是：[0,10),包含0但不包含10
     * @author mingzijian
     * @param s
     * @return
     */
    public String randomOne(String s[]) {
        return s[new Random().nextInt(s.length)];
    }  

    /**
     * 随机生成两位数的字符串（01-max）,不足两位的前面补0
     *
     * @author mingzijian
     * @param max
     * @return
     */
    public String randomCityCode(int max) {
        int i = new Random().nextInt(max) + 1;
        return i > 9 ? i + "" : "0" + i;
    }  

    /**
     * 随机生成minAge到maxAge年龄段的人的生日日期
     *
     * @author mingzijian
     * @param minAge
     * @param maxAge
     * @return
     */
    public String randomBirth(int minAge, int maxAge) {
        SimpleDateFormat dft = new SimpleDateFormat("yyyyMMdd");// 设置日期格式
        Calendar date = Calendar.getInstance();
        date.setTime(new Date());// 设置当前日期
        // 随机设置日期为前maxAge年至前minAge年的任意一天
        int randomDay = 365 * minAge  + new Random().nextInt(365 * (maxAge - minAge));
        date.set(Calendar.DATE, date.get(Calendar.DATE) - randomDay);
        return dft.format(date.getTime());
    }