java生成四位随机数，包含数字和字母区分大小写，特别适合做验证码，android开发...

最新推荐文章于 2023-04-04 23:18:59 发布

转载最新推荐文章于 2023-04-04 23:18:59 发布 · 253 阅读

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原文链接：https://my.oschina.net/mcxiaobing/blog/685024

本文介绍了一个Java工具类中的方法，该方法用于生成指定长度的随机字符串。通过数组和集合操作，确保每次调用都能得到不同的结果。此方法可以应用于验证码生成等场景。

2019独角兽企业重金招聘Python工程师标准>>>

private String generateWord() {  
        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);  
        return result;  
    }

工具类源代码下载地址：http://download.youkuaiyun.com/detail/qq_21376985/9502602

转载于:https://my.oschina.net/mcxiaobing/blog/685024