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Igor
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 Posted: Thu Jul 24, 2003 2:09 pm Post subject: Looking for id/key generator |
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Hi all,
I am looking for an ID/key generator in Java. It can be a class or a
package.
I need the result to be something like 2AF33Y88 - digits and letters
together.
It can be fixed size or I have to set the length.
Thanks in advance,
Igor
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Roy Epperson
Guest
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| Posted: Thu Jul 24, 2003 2:35 pm Post subject: Re: Looking for id/key generator |
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Here's a portion of a class I wrote to generate keys. I also have a method
to reject offensive words and fragments of words and a method that look into
a table of already generated keys to insure the new key is unique. Let me
know privately if you're interested in those.
private static final String characterMap =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
public static String[] generate(int randomStringLength, int
numberOfStrings, Random random){
String ans[] = new String[numberOfStrings];
for(int x= 0; x < numberOfStrings; x++){
StringBuffer sb = new StringBuffer();
for(int n = 0; n
sb.append(characterMap.charAt(random.nextInt(61)));
}
ans[x] = sb.toString();
}
return ans;
}
"Igor"
| Quote: | Hi all,
I am looking for an ID/key generator in Java. It can be a class or a
package.
I need the result to be something like 2AF33Y88 - digits and letters
together.
It can be fixed size or I have to set the length.
Thanks in advance,
Igor
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Johann Burkard
Guest
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| Posted: Thu Jul 24, 2003 9:25 pm Post subject: Re: Looking for id/key generator |
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Igor wrote:
[Please set a Followup-To when posting to multiple groups]
| Quote: | I am looking for an ID/key generator in Java. It can be a class or a
package.
I need the result to be something like 2AF33Y88 - digits and letters
together.
|
If you need unique keys, I implemented the UUID/GUID specification once,
it's at http://johannburkard.de/misc/uuid.zip.
If you need "safe" passwords, check out
http://johannburkard.de/misc/PasswordTools.java.
Johann
--
Fühle dich bitte nicht auf die Füsse getreten wenn ich dir sage, dass du
mit dem Niveau der meisten hier° nicht mithalten kannst. Du lieferst
Steil-vorlagen wie ein Troll. Allerliebst. (*Tönnes über mich in
<bcdlqr$aul$04$4 (AT) news (DOT) t-online.com>)
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Steve Horsley
Guest
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| Posted: Thu Jul 24, 2003 9:38 pm Post subject: Re: Looking for id/key generator |
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On Thu, 24 Jul 2003 22:06:54 +0200, G wrote:
| Quote: | One question.
What if you need not duplicated ids?
Is it enought if you use both timestamp + thread_id ?
Thank you.
|
Can you be sure the same thread won't hand out 2 nummbers within one
clock-tick (55mS on Win95)?
How about a class that hands out incrementing int values (let it wrap) and
concatenate that int value with the current time. You are unlikely to dish
out 4 billion IDs within 55mS.
Steve
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