java随机生成8位数授权码的实例

package com.bwsk.modules.weixin.util;import java.util.Random;/** *随机生成8位数授权码 * */public class RandomUtils {  //生成8位数的 字母 大小随机 当做授权码  public static String randomUtil(){    Random r = new Random();     String code = "";     for (int i = 0; i < 8; ++i) {       int temp = r.nextInt(52);       char x = (char) (temp < 26 ? temp + 97 : (temp % 26) + 65);       code += x;     }     return code;  }}