cn.luues.tool.captcha.graphical.base.ArithmeticCaptchaAbstract Maven / Gradle / Ivy
package cn.luues.tool.captcha.graphical.base;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
/**
* 算术验证码抽象类
* Created by Mr-wu
*/
public abstract class ArithmeticCaptchaAbstract extends Captcha {
private String arithmeticString; // 计算公式
public ArithmeticCaptchaAbstract() {
setLen(2);
}
/**
* 生成随机验证码
*
* @return 验证码字符数组
*/
@Override
protected char[] alphas() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
sb.append(num(10));
if (i < len - 1) {
int type = num(1, 4);
if (type == 1) {
sb.append("+");
} else if (type == 2) {
sb.append("-");
} else if (type == 3) {
sb.append("x");
}
}
}
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("javascript");
try {
chars = String.valueOf(engine.eval(sb.toString().replaceAll("x", "*")));
} catch (ScriptException e) {
e.printStackTrace();
}
sb.append("=?");
arithmeticString = sb.toString();
return chars.toCharArray();
}
public String getArithmeticString() {
checkAlpha();
return arithmeticString;
}
public void setArithmeticString(String arithmeticString) {
this.arithmeticString = arithmeticString;
}
}