图书项目：Tomcat版本 & Servlet & Filter & Jsp

package com.tianju.util; import java.awt.*; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Arrays; import java.util.Random; import java.util.concurrent.ThreadLocalRandom; /** * 生成图片验证码 */ public class ImageCodeUtils { //根据传入的位数，生成随机字符 public static String getRandomStr(int length) { String s = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ"; // Random random = new Random(System.currentTimeMillis()); Random random = new Random(); StringBuffer sb = new StringBuffer(); for (int i = 0; i < length; i++) { int i1 = random.nextInt(s.length()); sb.append(s.charAt(i1)); } return sb.toString(); } public static void main(String[] args) throws IOException, InterruptedException { for (int i = 0; i < 100; i++) { Thread.sleep(10); String randomStr = getRandomStr(4); System.out.println(randomStr); } // //BuffereImage 图片缓冲流 // BufferedImage bufferedImage = createImageCode(100, 34, "ABCD");//生成图片的缓冲流 // //把缓冲流，写到某个输出流 // ImageIO.write(bufferedImage,"jpg",new FileOutputStream("/Users/edz/Desktop/11.jpg")); } public static BufferedImage createImageCode(int width, int height, String code) { int codeSize = 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); 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, width, height); Color c = getRandColor(200, 250); g2.setColor(c);// 设置背景色 g2.fillRect(0, 2, width, height - 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(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 float yawpRate = 0.05f;// 噪声率 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); } shear(g2, width, height, c);// 使图片扭曲 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 < codeSize; i++) { AffineTransform affine = new AffineTransform(); affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (width / codeSize) * i + fontSize / 2, height / 2); g2.setTransform(affine); g2.drawChars(chars, i, 1, ((width - 10) / codeSize) * i + 5, height / 2 + fontSize / 2 - 10); } g2.dispose(); return image; } private static Color getRandColor(int fc, int bc) { Random random = ThreadLocalRandom.current(); 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() { Random random = ThreadLocalRandom.current(); 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) { Random random = ThreadLocalRandom.current(); 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 = (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * phase) / 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) { Random random = ThreadLocalRandom.current(); 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 = (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * phase) / 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); } } } }