package com.simple.utils; public class RandomUtils { private static String[] randomValues = new String[]{ "0","1","2","3","4","5","6","7","8","9", "a","b","c","d","e","f","g","h","i","j", "k","l","m","n","u","t","s","o","x","v", "p","q","r","w","y","z"}; private static String[] randomNums = new String[]{ "0","1","2","3","4","5","6","7","8","9", }; public static String getStr(int lenght) { StringBuffer str = new StringBuffer(); for(int i = 0;i < lenght; i++) { Double number=Math.random()*(randomValues.length-1); str.append(randomValues[number.intValue()]); } return str.toString(); } public static String getNum(int lenght) { StringBuffer str = new StringBuffer(); for(int i = 0;i < lenght; i++) { Double number=Math.random()*(randomNums.length-1); str.append(randomNums[number.intValue()]); } return str.toString(); } public static void main(String[] args) { System.out.println(getStr(32)); } }