java 生成动态验证码

 

话不多说直接上干货

 1  public static void main(String[] args) throws IOException {
 2         BufferedImage image = new BufferedImage(108, 40, 1);
 3         drawGraphic("gs45", image);
 4         File file = new File("d://abc.jpeg");
 5         ImageIO.write(image, "jpeg", file);
 6 
 7 
 8     }
 9     protected static final char[] charArray = "3456789ABCDEFGHJKMNPQRSTUVWXY".toCharArray();
10     protected static final Font[] RANDOM_FONT = new Font[]{new Font("Dialog", 1, 33), new Font("DialogInput", 1, 34), new Font("Serif", 1, 33), new Font("SansSerif", 1, 34), new Font("Monospaced", 1, 34)};
11     public static void drawGraphic(String randomString, BufferedImage image) {
12         Graphics2D g = image.createGraphics();
13         g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
14         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
15         g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
16         ThreadLocalRandom random = ThreadLocalRandom.current();
17         g.setColor(getRandomColor(210, 250, random));
18         g.fillRect(0, 0, 108, 40);
19         Color color = null;
20 
21         int i;
22         for(i = 0; i < 20; ++i) {
23             color = getRandomColor(120, 200, random);
24             g.setColor(color);
25             String rand = String.valueOf(charArray[random.nextInt(charArray.length)]);
26             g.drawString(rand, random.nextInt(108), random.nextInt(40));
27             color = null;
28         }
29 
30         g.setFont(RANDOM_FONT[random.nextInt(RANDOM_FONT.length)]);
31 
32         for(i = 0; i < randomString.length(); ++i) {
33             int degree = random.nextInt(28);
34             if (i % 2 == 0) {
35                 degree *= -1;
36             }
37 
38             int x = 22 * i;
39             int y = 21;
40             g.rotate(Math.toRadians((double)degree), (double)x, (double)y);
41             color = getRandomColor(20, 130, random);
42             g.setColor(color);
43             g.drawString(String.valueOf(randomString.charAt(i)), x + 8, y + 10);
44             g.rotate(-Math.toRadians((double)degree), (double)x, (double)y);
45         }
46 
47         g.setColor(color);
48         BasicStroke bs = new BasicStroke(3.0F);
49         g.setStroke(bs);
50         QuadCurve2D.Double curve = new QuadCurve2D.Double(0.0D, (double)(random.nextInt(32) + 4), 54.0D, 20.0D, 108.0D, (double)(random.nextInt(32) + 4));
51         g.draw(curve);
52         g.dispose();
53     }
54 
55     public static Color getRandomColor(int fc, int bc, ThreadLocalRandom random) {
56         if (fc > 255) {
57             fc = 255;
58         }
59 
60         if (bc > 255) {
61             bc = 255;
62         }
63 
64         int r = fc + random.nextInt(bc - fc);
65         int g = fc + random.nextInt(bc - fc);
66         int b = fc + random.nextInt(bc - fc);
67         return new Color(r, g, b);
68     }

 

效果图：

 

posted @ 2022-08-25 19:16  lanwf  阅读(104)  评论(0)  编辑  收藏  举报