org.aoju.bus.extra.captcha.AbstractMathCaptcha Maven / Gradle / Ivy

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package org.aoju.bus.extra.captcha;

import java.util.Random;

/**
 * @author Kimi Liu
 * @version 5.6.9
 * @since JDK 1.8+
 */
public abstract class AbstractMathCaptcha extends AbstractCaptcha {

    /**
     * 生成随机加减验证码
     *
     * @return 验证码字符数组
     */
    @Override
    protected char[] alphas() {
        // 生成随机类
        Random random = new Random();
        char[] cs = new char[4];
        int rand0 = random.nextInt(10);
        if (rand0 == 0) {
            rand0 = 1;
        }
        int rand1 = random.nextInt(10);
        boolean rand2 = random.nextBoolean();
        int rand3 = random.nextInt(10);
        cs[0] = (char) ('0' + rand0);
        cs[1] = (char) ('0' + rand1);
        cs[2] = rand2 ? '+' : '-';
        cs[3] = (char) ('0' + rand3);

        int num1 = rand0 * 10 + rand1;
        int num2 = rand3;
        int result = rand2 ? num1 + num2 : num1 - num2;
        chars = String.valueOf(result);
        return cs;
    }

}