56 lines
1.5 KiB
Java
56 lines
1.5 KiB
Java
package com.wf.captcha.base;
|
|
|
|
import javax.script.ScriptEngine;
|
|
import javax.script.ScriptEngineManager;
|
|
import javax.script.ScriptException;
|
|
|
|
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;
|
|
}
|
|
}
|