增加中文验证码功能

2018-07-28 00:22:49 +08:00
parent fda509dfe3
commit eeb7045f4d
9 changed files with 406 additions and 10 deletions
--- a/src/main/java/com/wf/captcha/ChineseGifCaptcha.java
+++ b/src/main/java/com/wf/captcha/ChineseGifCaptcha.java
@@ -0,0 +1,114 @@
+package com.wf.captcha;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class ChineseGifCaptcha extends ChineseCaptchaAbstract {
+
+    public ChineseGifCaptcha() {
+    }
+
+    public ChineseGifCaptcha(int width, int height) {
+        setWidth(width);
+        setHeight(height);
+    }
+
+    public ChineseGifCaptcha(int width, int height, int len) {
+        this(width, height);
+        setLen(len);
+    }
+
+    public ChineseGifCaptcha(int width, int height, int len, Font font) {
+        this(width, height, len);
+        setFont(font);
+    }
+
+    @Override
+    public boolean out(OutputStream os) {
+        checkAlpha();
+        boolean ok = false;
+        try {
+            char[] rands = textChar();  // 获取验证码数组
+            GifEncoder gifEncoder = new GifEncoder();
+            gifEncoder.start(os);
+            gifEncoder.setQuality(180);
+            gifEncoder.setDelay(100);
+            gifEncoder.setRepeat(0);
+            BufferedImage frame;
+            Color fontcolor = color();
+            for (int i = 0; i < len; i++) {
+                frame = graphicsImage(fontcolor, rands, i);
+                gifEncoder.addFrame(frame);
+                frame.flush();
+            }
+            gifEncoder.finish();
+            ok = true;
+        } finally {
+            try {
+                os.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+        return ok;
+    }
+
+    /**
+     * 画随机码图
+     *
+     * @param fontcolor 随机字体颜色
+     * @param strs      字符数组
+     * @param flag      透明度使用
+     * @return BufferedImage
+     */
+    private BufferedImage graphicsImage(Color fontcolor, char[] strs, int flag) {
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2d = (Graphics2D) image.getGraphics();
+        g2d.setColor(Color.WHITE);  // 填充背景颜色
+        g2d.fillRect(0, 0, width, height);
+        AlphaComposite ac3;
+        int h = height - ((height - font.getSize()) >> 1);
+        int w = width / len;
+        g2d.setFont(font);
+        g2d.setColor(fontcolor);
+        // 抗锯齿
+        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+        // 画验证码
+        for (int i = 0; i < len; i++) {
+            ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(flag, i));
+            g2d.setComposite(ac3);
+            int x = i * w + num(2, 6);
+            g2d.drawString(String.valueOf(strs[i]), x, h - num(2, 6));
+        }
+        // 随机画干扰线
+        g2d.setStroke(new BasicStroke(1.2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
+        for (int i = 0; i < 5; i++) {
+            ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.65f);
+            g2d.setComposite(ac3);
+            int x1 = num(-10, width - 10);
+            int y1 = num(5, height - 5);
+            int x2 = num(10, width + 10);
+            int y2 = num(2, height - 2);
+            g2d.drawLine(x1, y1, x2, y2);
+            // 画干扰圆圈
+            g2d.drawOval(num(width), num(height), 5 + num(10), 5 + num(10));
+        }
+        g2d.dispose();
+        return image;
+    }
+
+    /**
+     * 获取透明度,从0到1,自动计算步长
+     *
+     * @param i
+     * @param j
+     * @return 透明度
+     */
+    private float getAlpha(int i, int j) {
+        int num = i + j;
+        float r = (float) 1 / len, s = (len + 1) * r;
+        return num > len ? (num * r - s) : num * r;
+    }
+}