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+package cn.reghao.jutil.jdk.file;
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+
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+import javax.imageio.ImageIO;
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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.image.BufferedImage;
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+import java.awt.image.RenderedImage;
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+import java.io.ByteArrayOutputStream;
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+import java.io.IOException;
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+import java.security.SecureRandom;
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+import java.util.Random;
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+
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+/**
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+ * @author reghao
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+ * @date 2021-12-05 03:35:30
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+ */
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+public class CaptchaUtil {
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+ // 常用颜色
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+ private static final int[][] COLOR = {{0, 135, 255}, {51, 153, 51}, {255, 102, 102}, {255, 153, 0}, {153, 102, 0},
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+ {153, 102, 153}, {51, 153, 153}, {102, 102, 255}, {0, 102, 204}, {204, 51, 51}, {0, 153, 204}, {0, 51, 102}};
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+ private static final Random random = new SecureRandom();
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+
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+ public static ByteArrayOutputStream captchaWithDisturb(String randomStr, int width, int height) throws IOException {
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+ BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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+ Graphics2D g2d = (Graphics2D) bi.getGraphics();
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+ // 填充背景
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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
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+ drawOval(2, null, g2d, width, height);
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+ // 设置线条特征
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+ g2d.setStroke(new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
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+ // 画干扰线
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+ drawLine(1, null, g2d, width, height);
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+ // 画贝塞尔曲线
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+ drawBesselLine(1, null, g2d, width, height);
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+
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+ FontMetrics fontMetrics = g2d.getFontMetrics();
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+ // 每一个字符所占的宽度
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+ int fW = width / randomStr.length();
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+ // 字符的左右边距
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+ int fSp = (fW - (int) fontMetrics.getStringBounds("W", g2d).getWidth()) / 2;
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+ for (int i = 0; i < randomStr.length(); i++) {
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+ g2d.setColor(color());
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+ // 文字的纵坐标
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+ int fY = height - ((height - (int) fontMetrics.getStringBounds(String.valueOf(randomStr.charAt(i)), g2d).getHeight()) >> 1);
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+ g2d.drawString(String.valueOf(randomStr.charAt(i)), i * fW + fSp + 3, fY - 3);
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+ }
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+ g2d.dispose();
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+
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+ ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
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+ ImageIO.write((RenderedImage) bi, "jpg", byteArrayOutputStream);
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+ return byteArrayOutputStream;
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+ }
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+
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+ /**
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+ * 随机画干扰圆
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+ *
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+ * @param num 数量
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+ * @param color 颜色
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+ * @param g Graphics2D
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+ */
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+ private static void drawOval(int num, Color color, Graphics2D g, int width, int height) {
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+ for (int i = 0; i < num; i++) {
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+ g.setColor(color == null ? color() : color);
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+ int w = 5 + num(10);
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+ g.drawOval(num(width - 25), num(height - 15), w, w);
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+ }
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+ }
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+
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+ /**
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+ * 产生两个数之间的随机数
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+ *
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+ * @param min 最小值
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+ * @param max 最大值
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+ * @return 随机数
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+ */
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+ private static int num(int min, int max) {
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+ return min + random.nextInt(max - min);
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+ }
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+
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+ /**
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+ * 产生0-num的随机数,不包括num
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+ *
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+ * @param num 最大值
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+ * @return 随机数
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+ */
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+ private static int num(int num) {
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+ return random.nextInt(num);
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+ }
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+
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+ /**
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+ * 随机获取常用颜色
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+ *
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+ * @return 随机颜色
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+ */
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+ private static Color color() {
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+ int[] color = COLOR[num(COLOR.length)];
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+ int r = color[0];
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+ int g = color[1];
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+ int b = color[2];
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+ return new Color(r, g, b);
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+ }
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+
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+ /**
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+ * 随机画干扰线
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+ *
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+ * @param num 数量
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+ * @param color 颜色
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+ * @param g Graphics2D
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+ */
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+ private static void drawLine(int num, Color color, Graphics2D g, int width, int height) {
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+ for (int i = 0; i < num; i++) {
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+ g.setColor(color == null ? color() : color);
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+ int x1 = num(-10, width - 10);
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+ int y1 = num(5, height - 5);
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+ int x2 = num(10, width + 10);
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+ int y2 = num(2, height - 2);
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+ g.drawLine(x1, y1, x2, y2);
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+ }
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+ }
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+
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+ /**
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+ * 随机画贝塞尔曲线
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+ *
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+ * @param num 数量
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+ * @param color 颜色
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+ * @param g Graphics2D
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+ */
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+ private static void drawBesselLine(int num, Color color, Graphics2D g, int width, int height) {
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+ for (int i = 0; i < num; i++) {
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+ g.setColor(color == null ? color() : color);
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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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+ // 二阶贝塞尔曲线
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+ if (num(2) == 0) {
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+ QuadCurve2D shape = new QuadCurve2D.Double();
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+ shape.setCurve(x1, y1, ctrlx, ctrly, x2, y2);
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+ g.draw(shape);
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+ } else {
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+ // 三阶贝塞尔曲线
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+ int ctrlx1 = num(width / 4, width / 4 * 3), ctrly1 = num(5, height - 5);
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+ CubicCurve2D shape = new CubicCurve2D.Double(x1, y1, ctrlx, ctrly, ctrlx1, ctrly1, x2, y2);
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+ g.draw(shape);
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+ }
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+ }
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+ }
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+}
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