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| Articles > Misc > How to generate a Random Alpha numeric string | |
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How to generate a Random Alpha numeric string
Author: Venkata Sudhakar
The below example shows how to generate a Random Alpha numeric string in Java. If you are using Apache commons library this is pretty straight forward.
1 | RandomStringUtils.randomAlphanumeric(8) |
Another simple approach is using UUID
1 | UUID.randomUUID().toString().replaceAll("-", "") |
Here is another alternaive without any dependency on external libararies.
01 | private static final String ALLOWED_CHARS = |
02 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#$%^&*()"; |
03 | private static SecureRandom random = new SecureRandom(); |
05 | public static String geRandomString(int length){ |
06 | StringBuilder sb = new StringBuilder(length); |
07 | for(int i = 0; i < length; i++) { |
08 | sb.append(ALLOWED_CHARS.charAt(random.nextInt(ALLOWED_CHARS.length()))); |
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