隨機生成imei imsi mac

    private static String getIMEI() {// calculator IMEI
        int r1 = 1000000 + new java.util.Random().nextInt(9000000);
        int r2 = 1000000 + new java.util.Random().nextInt(9000000);
        String input = r1 + "" + r2;
        char[] ch = input.toCharArray();
        int a = 0, b = 0;
        for (int i = 0; i < ch.length; i++) {
            int tt = Integer.parseInt(ch[i] + "");
            if (i % 2 == 0) {
                a = a + tt;
            } else {
                int temp = tt * 2;
                b = b + temp / 10 + temp % 10;
            }
        }
        int last = (a + b) % 10;
        if (last == 0) {
            last = 0;
        } else {
            last = 10 - last;
        }
        return input + last;
    }

    private static String getImsi() {
        // 460022535025034
        String title = "4600";
        int second = 0;
        do {
            second = new java.util.Random().nextInt(8);
        } while (second == 4);
        int r1 = 10000 + new java.util.Random().nextInt(90000);
        int r2 = 10000 + new java.util.Random().nextInt(90000);
        return title + "" + second + "" + r1 + "" + r2;
    }
    private static String getMac(){
        char[] char1 = "abcdef".toCharArray();
        char[] char2 = "0123456789".toCharArray();
        StringBuffer mBuffer = new StringBuffer();
        for (int i = 0; i < 6; i++) {
            int t = new java.util.Random().nextInt(char1.length);
            int y = new java.util.Random().nextInt(char2.length);
            int key = new java.util.Random().nextInt(2);
            if (key ==0) {
                mBuffer.append(char2[y]).append(char1[t]);
            }else {
                mBuffer.append(char1[t]).append(char2[y]);
            }
            
            if (i!=5) {
                mBuffer.append(":");
            }
        }
        return mBuffer.toString();
    }