Generate a random Alphanumeric String without some characters

Question

I want to generate a random Alphanumeric String. I want to exlude some characters from my string

l, i, o and the number 0

For the moment i have this code:

import org.apache.commons.lang.RandomStringUtils;
...
numberFile = RandomStringUtils.randomAlphanumeric( 5 );

Answer 1

Since you are using RandomStringUtils you might aswell use the designated RandomStringUtils#random method for that.

public static String random(int count,
                            int start,
                            int end,
                            boolean letters,
                            boolean numbers,
                            char... chars)

Parameters:
count - the length of random string to create
start - the position in set of chars to start at
end - the position in set of chars to end before
letters - only allow letters?
numbers - only allow numbers?
chars - the set of chars to choose randoms from. If null, then it will use the set of all chars.

See the docs here.