package com.cms.util;

/**

 * 生成一个字母数字组合的n位随机码

 * @author abc

 *

 */

public class CodeUtil {

      //

     private final static String[] as ={"0","1","2","3","4","5","6","7","8","9",

                                        "a","b","c","d","e","f","g","h","i","j",

                                        "k","L","m","n","p","q","r","s","t","u",

                                        "y","z","A","B","C","D","E","F","G","H",

                                        "I","J","K","L","M","N","P","Q","R","S",

                                        "T","U","Y","Z","6","6","6","6","6","6"};

    //获取一个50(0-49)以内的随机数

     public static int getNumber(){

        return (int)(Math.random()*50);

     }

     /**

      * 返回一个字母数字组合的n位随机码

      * @param args

      */

     public static String getCode(int s){

         String code="";

         for(int i=0;i<s;i++){

             code+=as[getNumber()];

         }

         return code;

     }

     public static void main(String[] args) {

         for(int i=0;i<20;i++){

             System.out.println(getCode(4));

         }

    }

}