验证码的制作

关于验证码的一制作

验证码的制作

1、指定用于生成验证码的长度和来源

public class VerifyCodeUtils{

    //使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
    public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";
    private static Random random = new Random();

    /**
     * 使用系统默认字符源生成验证码
     * @param verifySize    验证码长度
     * @return
     */
    public static String generateVerifyCode(int verifySize){
        return generateVerifyCode(verifySize, VERIFY_CODES);
    }

    /**
     * 使用指定源生成验证码
     * @param verifySize    验证码长度
     * @param sources   验证码字符源
     * @return
     */
    public static String generateVerifyCode(int verifySize, String sources){
        if(sources == null || sources.length() == 0){
            sources = VERIFY_CODES;
        }
        int codesLen = sources.length(); //获取字符源的长度
        Random rand = new Random(System.currentTimeMillis());//
        StringBuilder verifyCode = new StringBuilder(verifySize);
        for(int i = 0; i < verifySize; i++){
            verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));
        }
        return verifyCode.toString();
    }

　　2、生成指定验证码图片

 1 /**
 2      * 生成指定验证码图像文件
 3      * @param w:验证码图片的宽
 4      * @param h:验证码图片的高
 5      * @param outputFile:图片保存的位置
 6      * @param code:生成的验证码
 7      * @throws IOException
 8      */
 9     public static void outputImage(int w, int h, File outputFile, String code) throws IOException{
10         /**如果图片保存的路径文件不存在，这结束*/
11         if(outputFile == null){
12             return;
13         }
14         /**获取该图片的父路径*/
15         File dir = outputFile.getParentFile();
16         if(!dir.exists()){
17             dir.mkdirs();
18         }
19         try{
20             /**判断该文件是否存在*/
21             outputFile.createNewFile();
22             /**创建输出流对象*/
23             FileOutputStream fos = new FileOutputStream(outputFile);
24             /**将图片输出文件的指定位置*/
25             outputImage(w, h, fos, code);
26             fos.close();
27         } catch(IOException e){
28             throw e;
29         }
30     }

　　3、开始画验证码

 1 /**
 2      * 输出指定验证码图片流
 3      * @param w:图片的宽
 4      * @param h:图片的高
 5      * @param os:图片的输出流
 6      * @param code:随机生成的字符
 7      * @throws IOException
 8      */
 9     public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{
10         /**获取验证码的长度*/
11         int verifySize = code.length();
12         /**构造一个BufferedImage义的图像类型的一个BufferedImage，imageType：创建图像的类型*/
13         BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
14         Random rand = new Random();
15         /**创建一个 Graphics2D ，可以用来绘制这个 BufferedImage*/
16         Graphics2D g2 = image.createGraphics();
17         /**为渲染算法设置单个首选项的值*/
18         g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
19         Color[] colors = new Color[5];
20         /**颜色的数组*/
21         Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,
22                 Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,
23                 Color.PINK, Color.YELLOW };
24         float[] fractions = new float[colors.length];
25         for(int i = 0; i < colors.length; i++){
26             colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
27             fractions[i] = rand.nextFloat();
28         }
29         Arrays.sort(fractions);
30 
31         g2.setColor(Color.GRAY);// 设置边框色
32         g2.fillRect(0, 0, w, h);
33         Color c = getRandColor(200, 250);
34         g2.setColor(c);// 设置背景色
35         g2.fillRect(0, 2, w, h-4);
36 
37         //绘制干扰线
38         Random random = new Random();
39         g2.setColor(getRandColor(160, 200));// 设置线条的颜色
40         for (int i = 0; i < 20; i++) {
41             int x = random.nextInt(w - 1);
42             int y = random.nextInt(h - 1);
43             int xl = random.nextInt(6) + 1;
44             int yl = random.nextInt(12) + 1;
45             g2.drawLine(x, y, x + xl + 40, y + yl + 20);
46         }
47 
48         // 添加噪点
49         float yawpRate = 0.05f;// 噪声率
50         int area = (int) (yawpRate * w * h);
51         for (int i = 0; i < area; i++) {
52             int x = random.nextInt(w);
53             int y = random.nextInt(h);
54             int rgb = getRandomIntColor();
55             image.setRGB(x, y, rgb);
56         }
57 
58         shear(g2, w, h, c);// 使图片扭曲
59 
60         g2.setColor(getRandColor(100, 160));
61         int fontSize = h-4;
62         Font font = new Font("Algerian", Font.ITALIC, fontSize);
63         g2.setFont(font);
64         char[] chars = code.toCharArray();
65         for(int i = 0; i < verifySize; i++){
66             AffineTransform affine = new AffineTransform();
67             affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);
68             g2.setTransform(affine);
69             g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);
70         }
71 
72         g2.dispose();
73         ImageIO.write(image, "jpg", os);
74     }
 1 private static Color getRandColor(int fc, int bc) {
 2         if (fc > 255)
 3             fc = 255;
 4         if (bc > 255)
 5             bc = 255;
 6         int r = fc + random.nextInt(bc - fc);
 7         int g = fc + random.nextInt(bc - fc);
 8         int b = fc + random.nextInt(bc - fc);
 9         return new Color(r, g, b);
10     }
11 
12     private static int getRandomIntColor() {
13         int[] rgb = getRandomRgb();
14         int color = 0;
15         for (int c : rgb) {
16             color = color << 8;
17             color = color | c;
18         }
19         return color;
20     }
21 
22     private static int[] getRandomRgb() {
23         int[] rgb = new int[3];
24         for (int i = 0; i < 3; i++) {
25             rgb[i] = random.nextInt(255);
26         }
27         return rgb;
28     }
29 
30     private static void shear(Graphics g, int w1, int h1, Color color) {
31         shearX(g, w1, h1, color);
32         shearY(g, w1, h1, color);
33     }
34 
35 
36     private static void shearX(Graphics g, int w1, int h1, Color color) {
37 
38         int period = random.nextInt(2);
39 
40         boolean borderGap = true;
41         int frames = 1;
42         int phase = random.nextInt(2);
43 
44         for (int i = 0; i < h1; i++) {
45             double d = (double) (period >> 1)
46                     * Math.sin((double) i / (double) period
47                     + (6.2831853071795862D * (double) phase)
48                     / (double) frames);
49             g.copyArea(0, i, w1, 1, (int) d, 0);
50             if (borderGap) {
51                 g.setColor(color);
52                 g.drawLine((int) d, i, 0, i);
53                 g.drawLine((int) d + w1, i, w1, i);
54             }
55         }
56 
57     }
58 
59 
60     private static void shearY(Graphics g, int w1, int h1, Color color) {
61 
62         int period = random.nextInt(40) + 10; // 50;
63 
64         boolean borderGap = true;
65         int frames = 20;
66         int phase = 7;
67         for (int i = 0; i < w1; i++) {
68             double d = (double) (period >> 1)
69                     * Math.sin((double) i / (double) period
70                     + (6.2831853071795862D * (double) phase)
71                     / (double) frames);
72             g.copyArea(i, 0, 1, h1, 0, (int) d);
73             if (borderGap) {
74                 g.setColor(color);
75                 g.drawLine(i, (int) d, i, 0);
76                 g.drawLine(i, (int) d + h1, i, h1);
77             }
78 
79         }
80 
81     }

 

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原文地址：https://www.cnblogs.com/xiaocao123/p/9510803.html