java中随机生成26个字母组合的随机验证码
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实现原理，通过随机生成1-52的随机数，然后从定义好的字母数字中取元素进行组合。
下面是代码：public static void login(){ String [] yan ={ "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", "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",}; int a = (int)(Math.random()*52); int b = (int)(Math.random()*52); int c = (int)(Math.random()*52); int d = (int)(Math.random()*52); String yanzhengma = yan[a]+yan[b]+yan[c]+yan[d]; System.out.println(yanzhengma); } 也可以自行扩展实现数字加字母组合的验证码。
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