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;
  }

}