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- static final String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
- static SecureRandom rnd = new SecureRandom();
- String randomString(int len){
- StringBuilder sb = new StringBuilder(len);
- for(int i = 0; i < len; i++)
- sb.append(AB.charAt(rnd.nextInt(AB.length())));
- return sb.toString();
- }
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