java原生生成验证码

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@WebServlet("/code") public class VerifyCodeUtils extends HttpServlet {       @Override     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {           //生成随机字串，长度4位         String verifyCode = VerifyCodeUtils.generateVerifyCode(4);           //存入会话session         HttpSession session = req.getSession();           session.setAttribute("verCode", verifyCode.toLowerCase());         System.out.println(session.getAttribute("verCode"));           //生成图片         int w = 100, h = 30;         VerifyCodeUtils.outputImage(w, h, resp.getOutputStream(), verifyCode);       }     //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();         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();     }       /**      * 生成随机验证码文件,并返回验证码值      * @param w      * @param h      * @param outputFile      * @param verifySize      * @return      * @throws IOException      */     public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{         String verifyCode = generateVerifyCode(verifySize);         outputImage(w, h, outputFile, verifyCode);         return verifyCode;     }       /**      * 输出随机验证码图片流,并返回验证码值      * @param w      * @param h      * @param os      * @param verifySize      * @return      * @throws IOException      */     public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{         String verifyCode = generateVerifyCode(verifySize);         outputImage(w, h, os, verifyCode);         return verifyCode;     }       /**      * 生成指定验证码图像文件      * @param w      * @param h      * @param outputFile      * @param code      * @throws IOException      */     public static void outputImage(int w, int h, File outputFile, String code) throws IOException{         if(outputFile == null){             return;         }         File dir = outputFile.getParentFile();         if(!dir.exists()){             dir.mkdirs();         }         try{             outputFile.createNewFile();             FileOutputStream fos = new FileOutputStream(outputFile);             outputImage(w, h, fos, code);             fos.close();         } catch(IOException e){             throw e;         }     }       /**      * 输出指定验证码图片流      * @param w      * @param h      * @param os      * @param code      * @throws IOException      */     public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{         int verifySize = code.length();         BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);         Random rand = new Random();         Graphics2D g2 = image.createGraphics();         g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);         Color[] colors = new Color[5];         Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,                 Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,                 Color.PINK, Color.YELLOW };         float[] fractions = new float[colors.length];         for(int i = 0; i < colors.length; i++){             colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];             fractions[i] = rand.nextFloat();         }         Arrays.sort(fractions);           g2.setColor(Color.GRAY);// 设置边框色         g2.fillRect(0, 0, w, h);           Color c = getRandColor(200, 250);         g2.setColor(c);// 设置背景色         g2.fillRect(0, 2, w, h-4);           //绘制干扰线         Random random = new Random();         g2.setColor(getRandColor(160, 200));// 设置线条的颜色         for (int i = 0; i < 20; i++) {             int x = random.nextInt(w - 1);             int y = random.nextInt(h - 1);             int xl = random.nextInt(6) + 1;             int yl = random.nextInt(12) + 1;             g2.drawLine(x, y, x + xl + 40, y + yl + 20);         }           // 添加噪点         float yawpRate = 0.05f;// 噪声率         int area = (int) (yawpRate * w * h);         for (int i = 0; i < area; i++) {             int x = random.nextInt(w);             int y = random.nextInt(h);             int rgb = getRandomIntColor();             image.setRGB(x, y, rgb);         }           shear(g2, w, h, c);// 使图片扭曲           g2.setColor(getRandColor(100, 160));         int fontSize = h-4;         Font font = new Font("Algerian", Font.ITALIC, fontSize);         g2.setFont(font);         char[] chars = code.toCharArray();         for(int i = 0; i < verifySize; i++){             AffineTransform affine = new AffineTransform();             affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);             g2.setTransform(affine);             g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);         }           g2.dispose();         ImageIO.write(image, "jpg", os);     }       private static Color getRandColor(int fc, int bc) {         if (fc > 255)             fc = 255;         if (bc > 255)             bc = 255;         int r = fc + random.nextInt(bc - fc);         int g = fc + random.nextInt(bc - fc);         int b = fc + random.nextInt(bc - fc);         return new Color(r, g, b);     }       private static int getRandomIntColor() {         int[] rgb = getRandomRgb();         int color = 0;         for (int c : rgb) {             color = color << 8;             color = color | c;         }         return color;     }       private static int[] getRandomRgb() {         int[] rgb = new int[3];         for (int i = 0; i < 3; i++) {             rgb[i] = random.nextInt(255);         }         return rgb;     }       private static void shear(Graphics g, int w1, int h1, Color color) {         shearX(g, w1, h1, color);         shearY(g, w1, h1, color);     }       private static void shearX(Graphics g, int w1, int h1, Color color) {           int period = random.nextInt(2);           boolean borderGap = true;         int frames = 1;         int phase = random.nextInt(2);           for (int i = 0; i < h1; i++) {             double d = (double) (period >> 1)                     * Math.sin((double) i / (double) period                     + (6.2831853071795862D * (double) phase)                     / (double) frames);             g.copyArea(0, i, w1, 1, (int) d, 0);             if (borderGap) {                 g.setColor(color);                 g.drawLine((int) d, i, 0, i);                 g.drawLine((int) d + w1, i, w1, i);             }         }       }       private static void shearY(Graphics g, int w1, int h1, Color color) {           int period = random.nextInt(40) + 10; // 50;           boolean borderGap = true;         int frames = 20;         int phase = 7;         for (int i = 0; i < w1; i++) {             double d = (double) (period >> 1)                     * Math.sin((double) i / (double) period                     + (6.2831853071795862D * (double) phase)                     / (double) frames);             g.copyArea(i, 0, 1, h1, 0, (int) d);             if (borderGap) {                 g.setColor(color);                 g.drawLine(i, (int) d, i, 0);                 g.drawLine(i, (int) d + h1, i, h1);             }           }       }     public static void main(String[] args) throws IOException {         String verifyCode = generateVerifyCode(4);         System.out.println(verifyCode);     } }