club.zhcs.lina.web.captcha.ImageVerification Maven / Gradle / Ivy

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package club.zhcs.lina.web.captcha;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import org.nutz.lang.random.R;

/**
 * 
 * @author Kerbores([email protected])
 *
 */
public class ImageVerification {

	public void setImageVerificationLength(int imageVerificationLength) {
		this.imageVerificationLength = imageVerificationLength;
	}

	private int imageVerificationLength = 4;

	private String verifyCode = "";

	private CaptchaGener captchaGener = new DefaultCaptchaGener();

	public ImageVerification() {
	}

	public ImageVerification(int imageVerificationLength, CaptchaGener captchaGener) {
		super();
		this.imageVerificationLength = imageVerificationLength;
		this.captchaGener = captchaGener;
	}

	public BufferedImage creatImage() {

		// 在内存中创建图象
		int width = 20 * imageVerificationLength + 20;
		int height = 38;
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		// 获取图形上下文
		Graphics g = image.getGraphics();

		// 设定背景色
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);

		// 设定字体
		g.setFont(new Font("Comic Sans MS", Font.BOLD, 25));

		// 随机产生255条干扰线，使图象中的认证码不易被其它程序探测到
		for (int i = 0; i < 1023; i++) {
			g.setColor(getRandColor(140, 255));
			int x = R.random(0, width);
			int y = R.random(0, height);
			int xl = R.random(0, 100);
			int yl = R.random(0, 100);
			Graphics2D g1 = (Graphics2D) g;
			g1.setStroke(new BasicStroke(3));
			g1.drawLine(x, y, x + xl, y + yl);
		}

		verifyCode = captchaGener.gen(imageVerificationLength);
		for (int i = 0; i < imageVerificationLength; i++) {
			String rand = verifyCode.charAt(i) + "";
			// 将认证码显示到图象中
			g.setColor(getRandColor(20, 130));// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			g.drawString(rand, 20 * i + 10, 25 + getRandInt(-5, 5));
		}
		// 图象生效
		g.dispose();
		return image;
	}

	public Color getRandColor(int b, int e) {// 给定范围获得随机颜色
		if (b > 255)
		{b = 255;}
		if (e > 255)
		{e = 255;}
		int rc = getRandInt(b, e);
		int gc = getRandInt(b, e);
		int bc = getRandInt(b, e);
		return new Color(rc, gc, bc);
	}

	public int getRandInt(int b, int e) {
		if (b > e) {
			int temp = e;
			e = b;
			b = temp;
		}
		return b + R.random(0, e - b);
	}

	public String getVerifyCode() {
		return verifyCode;
	}

	public void setCaptchaGener(CaptchaGener captchaGener) {
		this.captchaGener = captchaGener;
	}
}