RandomString.java

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package org.openslx.imagemaster.util;

import java.security.SecureRandom;

public class RandomString
{
   private static final String lettersSpecial = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890+-$%&/()=?@";
   private static final String letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
   private static final SecureRandom random = new SecureRandom();

   public static String generate( int length, boolean specialChars )
   {
      String used = ( specialChars ) ? lettersSpecial : letters;
      String result = "";
      for ( int i = 0; i < length; i++ ) {
         int index = (int) ( random.nextDouble() * used.length() );
         result += used.substring( index, index + 1 );
      }
      return result;
   }

   public static byte[] generateBinary( int length )
   {
      byte[] result = new byte[ length ];
      random.nextBytes( result );
      return result;
   }

}