package com.rosetta.im.protocol.util;

public class StringUtil {
    
    public static String randomString(int length) {
        StringBuilder sb = new StringBuilder();
        String characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        for (int i = 0; i < length; i++) {
            int index = (int) (Math.random() * characters.length());
            sb.append(characters.charAt(index));
        }
        return sb.toString();
    }

}