java随机生成数字字母验证码

最新推荐文章于 2023-01-11 12:00:13 发布

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该博客介绍了如何使用Java编程生成包含数字和字母的六位验证码。首先创建了一个包含数字和大写字母的字符串数组，然后通过Collections.shuffle进行随机排列，截取前六位作为验证码。此外，还提供了一个生成纯随机六位数字的辅助方法。

数字加字母
public class RandomTest { 
public static void main(String[] args) { 
   String[] beforeShuffle = new String[] { "2", "3", "4", "5", "6", "7",  
  "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",  
  "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",  
  "W", "X", "Y", "Z" };  
     List list = Arrays.asList(beforeShuffle);  
     Collections.shuffle(list);  
     StringBuilder sb = new StringBuilder();  
     for (int i = 0; i < list.size(); i++) {  
         sb.append(list.get(i));  
     }  
     String afterShuffle = sb.toString();  
     String result = afterShuffle.substring(5, 9);  
    System.out .print(result) ;
}}
随机生成六位数字
public static String getSix(){
    Random rad=new Random();

    String result  = rad.nextInt(1000000) +"";

    if(result.length()!=6){
        return getSix();
    }
    return result;
}