146 lines
5.0 KiB
Java
146 lines
5.0 KiB
Java
package com.wf.captcha;
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import com.wf.captcha.base.Captcha;
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import com.wf.captcha.utils.GifEncoder;
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import java.awt.*;
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import java.awt.geom.CubicCurve2D;
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import java.awt.geom.QuadCurve2D;
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import java.awt.geom.Rectangle2D;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* Gif验证码类
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* Created by 王帆 on 2018-07-27 上午 10:08.
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*/
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public class GifCaptcha extends Captcha {
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public GifCaptcha() {
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}
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public GifCaptcha(int width, int height) {
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setWidth(width);
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setHeight(height);
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}
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public GifCaptcha(int width, int height, int len) {
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this(width, height);
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setLen(len);
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}
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public GifCaptcha(int width, int height, int len, Font font) {
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this(width, height, len);
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setFont(font);
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}
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@Override
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public boolean out(OutputStream os) {
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try {
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char[] strs = textChar(); // 获取验证码数组
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// 随机生成每个文字的颜色
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Color fontColor[] = new Color[len];
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for (int i = 0; i < len; i++) {
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fontColor[i] = color();
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}
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// 随机生成贝塞尔曲线参数
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int x1 = 5, y1 = num(5, height / 2);
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int x2 = width - 5, y2 = num(height / 2, height - 5);
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int ctrlx = num(width / 4, width / 4 * 3), ctrly = num(5, height - 5);
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if (num(2) == 0) {
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int ty = y1;
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y1 = y2;
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y2 = ty;
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}
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int ctrlx1 = num(width / 4, width / 4 * 3), ctrly1 = num(5, height - 5);
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int[][] besselXY = new int[][]{{x1, y1}, {ctrlx, ctrly}, {ctrlx1, ctrly1}, {x2, y2}};
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// 开始画gif每一帧
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GifEncoder gifEncoder = new GifEncoder();
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gifEncoder.setQuality(180);
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gifEncoder.setDelay(100);
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gifEncoder.setRepeat(0);
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gifEncoder.start(os);
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for (int i = 0; i < len; i++) {
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BufferedImage frame = graphicsImage(fontColor, strs, i, besselXY);
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gifEncoder.addFrame(frame);
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frame.flush();
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}
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gifEncoder.finish();
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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os.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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return false;
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}
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@Override
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public String toBase64() {
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return toBase64("data:image/gif;base64,");
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}
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/**
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* 画随机码图
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*
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* @param fontColor 随机字体颜色
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* @param strs 字符数组
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* @param flag 透明度
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* @param besselXY 干扰线参数
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* @return BufferedImage
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*/
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private BufferedImage graphicsImage(Color[] fontColor, char[] strs, int flag, int[][] besselXY) {
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics2D g2d = (Graphics2D) image.getGraphics();
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// 填充背景颜色
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g2d.setColor(Color.WHITE);
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g2d.fillRect(0, 0, width, height);
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// 抗锯齿
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g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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// 画干扰圆圈
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g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f * num(10))); // 设置透明度
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drawOval(2, g2d);
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// 画干扰线
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g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.7f)); // 设置透明度
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g2d.setStroke(new BasicStroke(1.2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
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g2d.setColor(fontColor[0]);
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CubicCurve2D shape = new CubicCurve2D.Double(besselXY[0][0], besselXY[0][1], besselXY[1][0], besselXY[1][1], besselXY[2][0], besselXY[2][1], besselXY[3][0], besselXY[3][1]);
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g2d.draw(shape);
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// 画验证码
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g2d.setFont(getFont());
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FontMetrics fontMetrics = g2d.getFontMetrics();
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int fW = width / strs.length; // 每一个字符所占的宽度
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int fSp = (fW - (int) fontMetrics.getStringBounds("W", g2d).getWidth()) / 2; // 字符的左右边距
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for (int i = 0; i < strs.length; i++) {
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// 设置透明度
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AlphaComposite ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(flag, i));
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g2d.setComposite(ac3);
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g2d.setColor(fontColor[i]);
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int fY = height - ((height - (int) fontMetrics.getStringBounds(String.valueOf(strs[i]), g2d).getHeight()) >> 1); // 文字的纵坐标
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g2d.drawString(String.valueOf(strs[i]), i * fW + fSp + 3, fY - 3);
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}
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g2d.dispose();
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return image;
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}
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/**
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* 获取透明度,从0到1,自动计算步长
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*
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* @param i
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* @param j
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* @return 透明度
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*/
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private float getAlpha(int i, int j) {
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int num = i + j;
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float r = (float) 1 / (len - 1);
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float s = len * r;
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return num >= len ? (num * r - s) : num * r;
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}
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}
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