com.pig4cloud.captcha.SpecCaptcha Maven / Gradle / Ivy

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package com.pig4cloud.captcha;

import com.pig4cloud.captcha.base.Captcha;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;

/**
 * png格式验证码 Created by 王帆 on 2018-07-27 上午 10:08.
 */
public class SpecCaptcha extends Captcha {

	public SpecCaptcha() {
	}

	public SpecCaptcha(int width, int height) {
		this();
		setWidth(width);
		setHeight(height);
	}

	public SpecCaptcha(int width, int height, int len) {
		this(width, height);
		setLen(len);
	}

	public SpecCaptcha(int width, int height, int len, Font font) {
		this(width, height, len);
		setFont(font);
	}

	/**
	 * 生成验证码
	 * @param out 输出流
	 * @return 是否成功
	 */
	@Override
	public boolean out(OutputStream out) {
		return graphicsImage(textChar(), out);
	}

	@Override
	public String toBase64() {
		return toBase64("data:image/png;base64,");
	}

	@Override
	public String getContentType() {
		return "image/png";
	}

	/**
	 * 生成验证码图形
	 * @param strs 验证码
	 * @param out 输出流
	 * @return boolean
	 */
	private boolean graphicsImage(char[] strs, OutputStream out) {
		BufferedImage bi = null;
		try {
			bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
			Graphics2D g2d = (Graphics2D) bi.getGraphics();
			// 填充背景
			g2d.setColor(Color.WHITE);
			g2d.fillRect(0, 0, width, height);
			// 抗锯齿
			g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
			// 画干扰圆
			drawOval(2, g2d);
			// 画干扰线
			g2d.setStroke(new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
			drawBesselLine(1, g2d);
			// 画字符串
			g2d.setFont(getFont());
			FontMetrics fontMetrics = g2d.getFontMetrics();
			int fW = width / strs.length; // 每一个字符所占的宽度
			int fSp = (fW - (int) fontMetrics.getStringBounds("W", g2d).getWidth()) / 2; // 字符的左右边距
			for (int i = 0; i < strs.length; i++) {
				g2d.setColor(color());
				int fY = height
						- ((height - (int) fontMetrics.getStringBounds(String.valueOf(strs[i]), g2d).getHeight()) >> 1); // 文字的纵坐标
				g2d.drawString(String.valueOf(strs[i]), i * fW + fSp + 3, fY - 3);
			}
			g2d.dispose();
			ImageIO.write(bi, "png", out);
			out.flush();
			return true;
		}
		catch (IOException e) {
			e.printStackTrace();
		}
		finally {
			try {
				out.close();
			}
			catch (IOException e) {
				e.printStackTrace();
			}

			if (bi != null) {
				bi.getGraphics().dispose();
			}
		}
		return false;
	}

}