java生成验证码工具类，供大家参考，具体内容如下
package com.demo.utils;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.awt.geom.QuadCurve2D;import java.awt.image.BufferedImage;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.imageio.ImageIO;/** * 生成验证码 * @author dongyangyang * @Date 2017/3/13 12:31 * @Version 1.0 * */public class AuthCodeUtils { private final static Random random = new Random(); // 随机字体样式 private final static int[] fontStyle = { Font.HANGING_BASELINE, Font.ITALIC, Font.LAYOUT_LEFT_TO_RIGHT, Font.LAYOUT_NO_LIMIT_CONTEXT, Font.LAYOUT_NO_START_CONTEXT, Font.LAYOUT_RIGHT_TO_LEFT, Font.CENTER_BASELINE, Font.PLAIN, Font.ROMAN_BASELINE, Font.TRUETYPE_FONT, Font.TYPE1_FONT, Font.BOLD }; private final static String[] font = { "Ravie", "Forte", "Arial", "Courier" }; private final static int[] xarr = { 23, 24, 19, 20, 21 }; private final static int[] yarr = { 20, 21, 22, 23, 24, 25, 16, 17, 18 }; private final static int[] font_size = { 28, 29, 30, 21, 22, 23, 24, 27, 26, 25 }; /** * 画随机码图 * @param out * @param width * @param height * @throws IOException */ public static void draw(OutputStream out, String value) throws IOException { int width = 100, height = 40; BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = (Graphics2D) bi.getGraphics(); g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.setColor(randColor(240, 255)); g.fillRect(0, 0, width, height); g.drawRect(1, 1, width - 2, height - 2); for (int i = 0; i < 10; i++) { g.setColor(randColor(150, 250)); g.drawOval(random.nextInt(110), random.nextInt(24), 5 + random.nextInt(10), 5 + random.nextInt(10)); } g.setFont(getFont()); g.setColor(randColor(xarr[(int) (Math.random() * 5)], 254)); for (int i = 0, len = value.length(); i < len; i++) { String rand = String.valueOf(value.charAt(i)); int degree = random.nextInt(23); if (i % 2 == 0) { degree = degree * (-1); } int x = xarr[(int) (Math.random() * 5)] * i, y = yarr[(int) (Math.random() * 8)]; g.rotate(Math.toRadians(degree), x, y); g.setColor(randColor(48, 254)); g.drawString(rand, x + 8, y + 10); g.rotate(-Math.toRadians(degree), x, y); } // 图片中间线 g.setColor(randColor(0, 200)); // width是线宽,float型 BasicStroke bs = new BasicStroke(2); g.setStroke(bs); // 画出曲线 QuadCurve2D.Double curve = new QuadCurve2D.Double(0d, random.nextInt(height - 8) + 4, width / 2, height / 2, width, random.nextInt(height - 8) + 4); g.draw(curve); // 销毁图像 g.dispose(); ImageIO.write(bi, "png", out); } private static Font getFont() { return new Font(font[(int) (Math.random() * 4)], fontStyle[(int) (Math.random() * 12)], font_size[(int) (Math.random() * 10)]); } private static Color randColor(int fc, int bc) {// 给定范围获得随机颜色 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 char[] c = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '3', '5', '6', '7', '8', '9' }; public static String getRandom(int size) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < size; i++) { sb.append(c[Math.abs(random.nextInt()) % c.length]); } return sb.toString(); } public static void main(String[] args) throws IOException { for (int i = 1; i < 10; i++) { FileOutputStream out = new FileOutputStream("D://bb"+ i +".png"); draw(out, getRandom(4)); } }}以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。