编程：自己写的强密码生成函数：留存

 

    private static String get_StrongPassword(int len) {
        if (len < 6)
            len = 6;

        String digit = "0123456789";
        String alpha_lower = "abcdefghijklmnopqrstuvwxyz";
        String alpha_upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        String symbl = " `~!@#$%^&*()-_=+\\|[{]};:'\",<.>/?";
        // String space = " \t";

        ArrayList<String[]> ary = new ArrayList<String[]>();
        ary.add(toCharStringArray(digit));
        ary.add(toCharStringArray(alpha_lower));
        ary.add(toCharStringArray(alpha_upper));
        ary.add(toCharStringArray(symbl));

        String[] pass = new String[len];
        String ss = "";

        // TODO get_StrongPassword : benchmark
        for (int test = 0; test < 1000; test++) {
            for (int i = 0; i < len; i++) {

                String[] ae = ary.get((int) (Math.random() * 4));
                pass[i] = ae[(int) (Math.random() * ae.length)];
            }
            ss = prtStrAry(pass, len);
        }

        return ss;
    }

 

    private static String[] toCharStringArray(String str) {
        if (str == null)
            return null;

        ArrayList<String> chary = new ArrayList<String>();
        for (int i = 0; i < str.length(); i++)
            chary.add(str.substring(i, i + 1));

        return chary.toArray(new String[0]);
    }