java验证码工具类-蒲公英云

java验证码工具类

package com.jdkj.charge.common.utils;
import java.util.Random;
public class ValidCodeUtils {
    private static char[] numbers = "0123456789".toCharArray();
    private static char[] words = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ".toCharArray();
    private static final int MIN_LEN = 4;
    private static final int MAX_LEN = 8;
    /**
     * @param len
     * @return
     * @author: ChenYan
     * @date: 2019年4月24日
     * @description: 返回数字验证码
     */
    public static String generateNumber(int len) {
        len = limitLen(len);
        Random random = new Random();
        char[] cs = new char[len];
        for (int i = 0; i < cs.length; i++) {
            cs[i] = numbers[random.nextInt(numbers.length)];
        }
        return new String(cs);
    }
    /**
     * @param len
     * @return
     * @author: ChenYan
     * @date: 2019年4月24日
     * @description: 返回字符数字混合型验证码
     */
    public static String generateCode(int len) {
        len = limitLen(len);
        Random random = new Random();
        char[] cs = new char[len];
        for (int i = 0; i < cs.length; i++) {
            cs[i] = words[random.nextInt(words.length)];
        }
        return new String(cs);
    }
    /**
     * @param len
     * @return
     * @author: ChenYan
     * @date: 2019年4月24日
     * @description: 限制验证码长度
     */
    private static int limitLen(int len) {
        if (len < MIN_LEN) {
            return MIN_LEN;
        } else if (len > MAX_LEN) {
            return MAX_LEN;
        } else {
            return len;
        }
    }
    public static void main(String[] args) {
        String code = ValidCodeUtils.generateCode(6);
        System.out.println("code====" + code);
        String number = ValidCodeUtils.generateNumber(6);
        System.out.println("number====" + number);
    }
}