今天看了关于java web的介绍,然后安装了vs code和他的一些使用技巧。
随机生成一张验证码图片
public class CheckCodeUtil { public static final String VERIFY_CODES = "123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; private static Random random = new Random(); public static void main(String[] args) throws IOException { FileOutputStream fos=new FileOutputStream("d:/abc.jpg"); outputVerifyImage(100,50,fos,4); } /** * 输出随机验证码图片流,并返回验证码值(一般传入输出流,响应response页面端,Web项目用的较多) * * @param width * @param height * @param os * @param verifySize * @return * @throws IOException */ public static String outputVerifyImage(int width, int height, OutputStream os, int verifySize) throws IOException { String verifyCode = generateVerifyCode(verifySize); outputImage(width, height, os, verifyCode); return verifyCode; } /** * 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) { // 未设定展示源的字码,赋默认值大写字母+数字 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 (生成图片形式,用的较少) * * @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; } /** * 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(); //文件不存在 if (!dir.exists()) { //创建 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); // 创建颜色集合,使用java.awt包下的类 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); // 设置边框色 g2.setColor(Color.GRAY); g2.fillRect(0, 0, w, h); Color c = getRandColor(200, 250); // 设置背景色 g2.setColor(c); g2.fillRect(0, 2, w, h - 4); // 绘制干扰线 Random random = new Random(); // 设置线条的颜色 g2.setColor(getRandColor(160, 200)); 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 // 噪声率 float yawpRate = 0.05f; int area = (int) (yawpRate * w * h); for (int i = 0; i < area; i++) { int x = random.nextInt(w); int y = random.nextInt(h); // 获取随机颜色 int rgb = getRandomIntColor(); image.setRGB(x, y, rgb); } // 添加图片扭曲 shear(g2, w, h, c); 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); } /** * 随机颜色 * * @param fc * @param bc * @return */ 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); } } } }
标签:14,verifySize,int,天气,param,Color,2023,new,g2 From: https://www.cnblogs.com/Christmas77/p/17726935.html