【精品】好用的验证码工具类VerifyCodeUtils

ByteArrayOutputStream baos = new ByteArrayOutputStream();

VerifyCodeUtil.outputImage(100, 39, baos, code);

final String BASE64_IMAGE = “data:image/jpeg;base64,%s”;

String base64Img = String.format(BASE64_IMAGE, Base64Util.encode(baos.toByteArray()));

return base64Img;

}

/**

• 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©;// 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);

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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 - 6;

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 {

File dir = new File(“D:/upload/verifyCode”);

int w = 200, h = 80;

for (int i = 0; i < 50; i++) {

String verifyCode = generateVerifyCode(4);

File file = new File(dir, verifyCode + “.jpg”);

outputImage(w, h, file, verifyCode);