44 lines
1.2 KiB
Java
44 lines
1.2 KiB
Java
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package com.jxy.windminer.common.utils;
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import java.util.Random;
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/**
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* @Description TODO
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* @Date 2022/11/18 14:26
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* @Author 杜懿
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*/
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public class CodeUtils {
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//public static void main(String[] args) {
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// String s = creatCode(4);
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// //System.out.println("随机验证码为：" + s);
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//}
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//定义一个方法返回一个随机验证码
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public static String creatCode(int n) {
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String code = "";
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Random r = new Random();
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//2.在方法内部使用for循环生成指定位数的随机字符，并连接起来
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for (int i = 0; i <= n; i++) {
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//生成一个随机字符：大写 ，小写 ，数字（0 1 2）
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int type = r.nextInt(3);
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switch (type) {
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case 0:
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char ch = (char) (r.nextInt(26) + 65);
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code += ch;
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break;
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case 1:
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char ch1 = (char) (r.nextInt(26) + 97);
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code += ch1;
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break;
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case 2:
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code += r.nextInt(10);
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break;
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}
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}
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return code;
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}
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}
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