package com.ruoyi.common.utils;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.geom.AffineTransform;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.security.SecureRandom;
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import java.util.Arrays;
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import java.util.Random;
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import javax.imageio.ImageIO;
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/**
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* 验证码工具类
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*
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* @author ruoyi
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*/
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public class VerifyCodeUtils
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{
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// 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
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public static final String VERIFY_CODES = "123456789ABCDEFGHJKLMNPQRSTUVWXYZ";
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private static Random random = new SecureRandom();
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/**
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* 使用系统默认字符源生成验证码
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*
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* @param verifySize 验证码长度
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* @return
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*/
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public static String generateVerifyCode(int verifySize)
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{
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return generateVerifyCode(verifySize, VERIFY_CODES);
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}
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/**
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* 使用指定源生成验证码
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*
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* @param verifySize 验证码长度
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* @param sources 验证码字符源
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* @return
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*/
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public static String generateVerifyCode(int verifySize, String sources)
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{
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if (sources == null || sources.length() == 0)
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{
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sources = VERIFY_CODES;
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}
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int codesLen = sources.length();
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Random rand = new Random(System.currentTimeMillis());
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StringBuilder verifyCode = new StringBuilder(verifySize);
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for (int i = 0; i < verifySize; i++)
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{
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verifyCode.append(sources.charAt(rand.nextInt(codesLen - 1)));
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}
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return verifyCode.toString();
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}
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/**
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* 输出指定验证码图片流
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*
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* @param w
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* @param h
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* @param os
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* @param code
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* @throws IOException
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*/
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public static void outputImage(int w, int h, OutputStream os, String code) throws IOException
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{
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int verifySize = code.length();
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BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
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Random rand = new Random();
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Graphics2D g2 = image.createGraphics();
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g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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Color[] colors = new Color[5];
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Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA,
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Color.ORANGE, Color.PINK, Color.YELLOW };
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float[] fractions = new float[colors.length];
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for (int i = 0; i < colors.length; i++)
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{
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colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
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fractions[i] = rand.nextFloat();
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}
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Arrays.sort(fractions);
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g2.setColor(Color.GRAY);// 设置边框色
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g2.fillRect(0, 0, w, h);
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Color c = getRandColor(200, 250);
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g2.setColor(c);// 设置背景色
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g2.fillRect(0, 2, w, h - 4);
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// 绘制干扰线
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Random random = new Random();
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g2.setColor(getRandColor(160, 200));// 设置线条的颜色
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for (int i = 0; i < 20; i++)
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{
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int x = random.nextInt(w - 1);
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int y = random.nextInt(h - 1);
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int xl = random.nextInt(6) + 1;
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int yl = random.nextInt(12) + 1;
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g2.drawLine(x, y, x + xl + 40, y + yl + 20);
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}
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// 添加噪点
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float yawpRate = 0.05f;// 噪声率
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int area = (int) (yawpRate * w * h);
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for (int i = 0; i < area; i++)
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{
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int x = random.nextInt(w);
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int y = random.nextInt(h);
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int rgb = getRandomIntColor();
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image.setRGB(x, y, rgb);
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}
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shear(g2, w, h, c);// 使图片扭曲
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g2.setColor(getRandColor(100, 160));
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int fontSize = h - 4;
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Font font = new Font("Algerian", Font.ITALIC, fontSize);
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g2.setFont(font);
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char[] chars = code.toCharArray();
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for (int i = 0; i < verifySize; i++)
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{
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AffineTransform affine = new AffineTransform();
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affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1),
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(w / verifySize) * i + fontSize / 2, h / 2);
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g2.setTransform(affine);
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g2.drawChars(chars, i, 1, ((w - 10) / verifySize) * i + 5, h / 2 + fontSize / 2 - 10);
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}
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g2.dispose();
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ImageIO.write(image, "jpg", os);
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}
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private static Color getRandColor(int fc, int bc)
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{
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if (fc > 255) {
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fc = 255;
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}
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if (bc > 255) {
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bc = 255;
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}
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int r = fc + random.nextInt(bc - fc);
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int g = fc + random.nextInt(bc - fc);
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int b = fc + random.nextInt(bc - fc);
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return new Color(r, g, b);
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}
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private static int getRandomIntColor()
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{
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int[] rgb = getRandomRgb();
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int color = 0;
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for (int c : rgb)
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{
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color = color << 8;
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color = color | c;
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}
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return color;
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}
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private static int[] getRandomRgb()
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{
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int[] rgb = new int[3];
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for (int i = 0; i < 3; i++)
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{
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rgb[i] = random.nextInt(255);
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}
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return rgb;
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}
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private static void shear(Graphics g, int w1, int h1, Color color)
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{
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shearX(g, w1, h1, color);
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shearY(g, w1, h1, color);
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}
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private static void shearX(Graphics g, int w1, int h1, Color color)
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{
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int period = random.nextInt(2);
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boolean borderGap = true;
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int frames = 1;
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int phase = random.nextInt(2);
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for (int i = 0; i < h1; i++)
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{
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double d = (double) (period >> 1)
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* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
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g.copyArea(0, i, w1, 1, (int) d, 0);
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if (borderGap)
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{
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g.setColor(color);
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g.drawLine((int) d, i, 0, i);
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g.drawLine((int) d + w1, i, w1, i);
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}
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}
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}
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private static void shearY(Graphics g, int w1, int h1, Color color)
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{
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int period = random.nextInt(40) + 10; // 50;
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boolean borderGap = true;
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int frames = 20;
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int phase = 7;
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for (int i = 0; i < w1; i++)
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{
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double d = (double) (period >> 1)
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* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
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g.copyArea(i, 0, 1, h1, 0, (int) d);
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if (borderGap)
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{
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g.setColor(color);
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g.drawLine(i, (int) d, i, 0);
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g.drawLine(i, (int) d + h1, i, h1);
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}
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}
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}
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}
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