Chatto/src/main/java/org/ros/chatto/captcha/SimpleCaptchaBehavior.java

package org.ros.chatto.captcha;

import java.awt.image.BufferedImage;
import java.util.Random;

public class SimpleCaptchaBehavior implements CaptchaBehaviour {
	@Override
	public BufferedImage generateCaptcha() {
		SimpleCaptcha simpleCaptcha = new SimpleCaptcha();
		return simpleCaptcha.getImagePng();
	}

	@Override
	public BufferedImage generateCaptcha(String captchaText) {
		SimpleCaptcha simpleCaptcha = new SimpleCaptcha(captchaText);
		return simpleCaptcha.getImagePng();
	}

	public String getRandomChars() {
		return getRandomChars(8);
	}

	public String getRandomChars(int quantity) {
		char[] randomString = new char[quantity];

		Random random = new Random();

		int capitalLetter;

		for (int i = 0; i < quantity; i++) {
			capitalLetter = 65 + random.nextInt(26);
			randomString[i] = (char) capitalLetter;
		}

		return new String(randomString);
	}

}