com.github.yiuman.citrus.security.verify.VerifyUtils Maven / Gradle / Ivy
package com.github.yiuman.citrus.security.verify;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.util.Random;
/**
* 验证码工具
*
* 验证码生成工具
*
* @author yiuman
* @date 2020/3/22
*/
public final class VerifyUtils {
/**
* 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 final 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
*/
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
*/
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();
}
/**
* 输出指定验证码图片流
*
* @param width 宽度
* @param height 高度
* @param code 验证码字符串
*/
public static BufferedImage bufferedImage(int width, int height, String code) {
int verifySize = code.length();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Random rand = new Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 设置边框色
g2.setColor(Color.GRAY);
g2.fillRect(0, 0, width, height);
// 设置背景色
Color c = getRandColor(200, 250);
g2.setColor(c);
g2.fillRect(0, 2, width, height - 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(width - 1);
int y = random.nextInt(height - 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 * width * height);
for (int i = 0; i < area; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int rgb = getRandomIntColor();
image.setRGB(x, y, rgb);
}
// 使图片扭曲
shear(g2, width, height, c);
g2.setColor(getRandColor(100, 160));
int fontSize = height - 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), (float) (width / verifySize) * i + (float) fontSize / 2, (float) height / 2);
g2.setTransform(affine);
g2.drawChars(chars, i, 1, ((width - 10) / verifySize) * i + 5, height / 2 + fontSize / 2 - 10);
}
g2.dispose();
return image;
}
private static Color getRandColor(int fc, int bc) {
fc = Math.min(fc, 255);
bc = Math.min(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;
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);
}
}
}
}