This intrigued me so I just wrote this little program. Of course it could
be wrapped up in a bean and it needs to check against a list of established
passwords but it gives you upper-lower case random sequence of alpha-numeric
characters. Just feed it the length that you want. It even cleans up after
itself. :0)
public class CraigsRandomizer {
// generates a random alpha-numeric sequence
public static void main(String[] args) {
CraigsRandomizer t = new CraigsRandomizer();
t.randomPass(12); // set to length of 12
}
final void randomPass(int len) {
int[] random = new int[len];
int i = 0;
String result = "";
while(i < random.length) {
int n = (int)(Math.random() * 122);
if (!(n < 49) && (!((n >= 58) && (n <= 64))) && (!((n >= 91)
&& (n <=
96)))) {
random[i] = n;
i++;
}
}
for(int j = 0; j < random.length; j++) {
result += (char)random[j];
}
random = null;
System.out.println(result);
}
}
Let me know if I can help.
Regards,
Craig O'Brien
Java Programmer/Web Developer
> -----Oryginalna wiadomooeæ-----
> Od: Cato, Christopher [mailto:[EMAIL PROTECTED]]
> Wys³ano: 1 marca 2001 15:05
> Do: '[EMAIL PROTECTED]'
> Temat: Generating a random alphanumeric string
>
>
> Hello, can anyone show me an example or give me a clue about how
> to generate a random alphanumeric string of lets say 16-32 chars?
> TomCat is obviously doing it for the session ids, but how would I
> do the same in a servlet?
>
> Regards,
>
> Christopher Cato
>
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