1 package org.micro.service.springboot; 2  3 import java.util.Random; 4  5 /** 6  * @author: ChenYan 7  * @date: 2019年4月24日 8  * @description: 生成验证码 9  */10 public class ValidCodeUtils {11 12     private static char[] numbers = "0123456789".toCharArray();13 14     private static char[] words = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ".toCharArray();15 16     private static final int MIN_LEN = 4;17 18     private static final int MAX_LEN = 8;19 20     /**21      * @author: ChenYan22      * @date: 2019年4月24日23      * @param len24      * @return25      * @description: 返回数字验证码26      */27     public static String generateNumber(int len) {28         len = limitLen(len);29         Random random = new Random();30         char[] cs = new char[len];31         for (int i = 0; i < cs.length; i++) {32             cs[i] = numbers[random.nextInt(numbers.length)];33         }34         return new String(cs);35     }36 37     /**38      * @author: ChenYan39      * @date: 2019年4月24日40      * @param len41      * @return42      * @description:  返回字符数字混合型验证码43      */44     public static String generateCode(int len) {45         len = limitLen(len);46         Random random = new Random();47         char[] cs = new char[len];48         for (int i = 0; i < cs.length; i++) {49             cs[i] = words[random.nextInt(words.length)];50         }51         return new String(cs);52     }53 54     /**55      * @author: ChenYan56      * @date: 2019年4月24日57      * @param len58      * @return59      * @description: 限制验证码长度60      */61     private static int limitLen(int len) {62         if (len < MIN_LEN) {63             return MIN_LEN;64         } else if (len > MAX_LEN) {65             return MAX_LEN;66         } else {67             return len;68         }69     }70     71     public static void main(String[] args) {72         String code=ValidCodeUtils.generateCode(6);73         System.out.println("code===="+code);74         String  number=ValidCodeUtils.generateNumber(6);75         System.out.println("number===="+number);76     }77 }