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/ChineseCaptcha.java
+++ b/src/main/java/com/wf/captcha/ChineseCaptcha.java
@@ -0,0 +1,99 @@
+package com.wf.captcha;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class ChineseCaptcha extends ChineseCaptchaAbstract {
+
+    public ChineseCaptcha() {
+        super();
+    }
+
+    public ChineseCaptcha(int width, int height) {
+        this();
+        setWidth(width);
+        setHeight(height);
+    }
+
+    public ChineseCaptcha(int width, int height, int len) {
+        this(width, height);
+        setLen(len);
+    }
+
+    public ChineseCaptcha(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) {
+        checkAlpha();
+        return graphicsImage(textChar(), out);
+    }
+
+    /**
+     * 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) {
+        boolean ok;
+        try {
+            BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+            Graphics2D g = (Graphics2D) bi.getGraphics();
+            AlphaComposite ac3;
+            int len = strs.length;
+            g.setColor(Color.WHITE);
+            g.fillRect(0, 0, width, height);
+            g.setColor(color());
+            g.setFont(font);
+            int h = height - ((height - font.getSize()) >> 1);
+            int w = width / len;
+            // 抗锯齿
+            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+            // 画字符串
+            for (int i = 0; i < len; i++) {
+                int x = i * w + num(2, 6);
+                int y = h - num(2, 6);
+                g.drawString(String.valueOf(strs[i]), x, y);
+            }
+            // 随机画干扰线
+            g.setStroke(new BasicStroke(1.25f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
+            for (int i = 0; i < 8; i++) {
+                ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.75f);  // 指定透明度
+                g.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);
+                g.drawLine(x1, y1, x2, y2);
+                // 画干扰圆圈
+                g.drawOval(num(width), num(height), 5 + num(25), 5 + num(25));
+            }
+            ImageIO.write(bi, "png", out);
+            out.flush();
+            ok = true;
+        } catch (IOException e) {
+            ok = false;
+            e.printStackTrace();
+        } finally {
+            try {
+                out.close();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+        return ok;
+    }
+}