1 public class Test01 {
 2     public static void main(String[] args) {
 3         String code = Test01.randomCode(32);
 4         System.out.println(code);
 5     }
 6 
 7     // 返回随机字符串，
 8     public static String randomCode(int length) {
 9         // 定义字符串的范围
10         char[] codeSequence = { ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘,
11                 ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘,
12                 ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘, ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘,
13                 ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘, ‘g‘, ‘h‘, ‘i‘,
14                 ‘j‘, ‘k‘, ‘l‘, ‘m‘, ‘n‘, ‘o‘, ‘p‘, ‘q‘, ‘r‘, ‘s‘, ‘t‘, ‘u‘,
15                 ‘v‘, ‘w‘, ‘x‘, ‘y‘, ‘z‘ };
16 
17         // 随机函数
18         Random random = new Random();
19 
20         // 用于获取到字符串后添加，
21         StringBuilder builder = new StringBuilder();
22 
23         for (int i = 0; i < length; i++) {
24             int b = random.nextInt(62);
25             builder.append(codeSequence[b]);
26         }
27         return builder.toString();
28     }
29 }