100字范文 > Java验证码图片工具类

Java验证码图片工具类

时间：2023-11-16 17:25:37

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Java验证码图片工具类

工具类源码

import mons.codec.binary.Base64;import javax.imageio.ImageIO;import java.awt.*;import java.awt.geom.QuadCurve2D;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.util.HashMap;import java.util.Map;import java.util.Random;/*** 生成验证码工具类** @author whw* @date /1/7 16:49*/public class CaptchaUtil {/*** 默认宽度*/private static final int WIDTH = 108;/*** 默认高度*/private static final int HEIGHT = 40;/*** 默认长度*/private static final int CODE_SIZE = 4;/*** 验证码随机字符数组*///private static final char[] CHAR_ARRAY = "23456789ABCDEFGHJKMNPQRSTUVWXY".toCharArray();private static final char[] CHAR_ARRAY = "0123456789".toCharArray();/*** 生成随机类*/private static final Random RANDOM = new Random();/*** 验证码字体*/private static final Font[] RANDOM_FONT = new Font[]{new Font(Font.DIALOG, Font.BOLD, 33),new Font(Font.DIALOG_INPUT, Font.BOLD, 34),new Font(Font.SERIF, Font.BOLD, 33),new Font(Font.SANS_SERIF, Font.BOLD, 34),new Font(Font.MONOSPACED, Font.BOLD, 34)};/*** 生成验证码** @param code* @return*/public static Map<String, String> generate(String code) {Map<String, String> map = new HashMap<>(2);BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);ByteArrayOutputStream baos = new ByteArrayOutputStream();try {drawGraphic(image, code);ImageIO.write(image, "jpeg", baos);//转换成字节byte[] bytes = baos.toByteArray();//转换成base64串String base64 = Base64.encodeBase64String(bytes);//删除 \r\nbase64 = base64.replaceAll("\n", "").replaceAll("\r", "");map.put("base64", "data:image/jpeg;base64," + base64);map.put("code", code);baos.close();} catch (Exception e) {throw new RuntimeException(e);}return map;}/*** 生成验证码字符串*/public static String generateCode() {int count = CODE_SIZE;char[] buffer = new char[count];for (int i = 0; i < count; i++) {buffer[i] = CHAR_ARRAY[RANDOM.nextInt(CHAR_ARRAY.length)];}return new String(buffer);}/*** 绘制图形** @param image* @param code*/private static void drawGraphic(BufferedImage image, String code) {// 获取图形上下文Graphics2D g = image.createGraphics();g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);// 图形抗锯齿g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 字体抗锯齿g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);// 设定背景色，淡色g.setColor(getRandColor(210, 250));g.fillRect(0, 0, WIDTH, HEIGHT);// 画小字符背景Color color = null;for (int i = 0; i < 20; i++) {color = getRandColor(120, 200);g.setColor(color);String rand = String.valueOf(CHAR_ARRAY[RANDOM.nextInt(CHAR_ARRAY.length)]);g.drawString(rand, RANDOM.nextInt(WIDTH), RANDOM.nextInt(HEIGHT));color = null;}// 取随机产生的认证码(4位数字)char[] buffer = code.toCharArray();for (int i = 0; i < buffer.length; i++) {//旋转度数最好小于45度int degree = RANDOM.nextInt(28);if (i % 2 == 0) {degree = degree * (-1);}//定义坐标int x = 22 * i, y = 21;//旋转区域g.rotate(Math.toRadians(degree), x, y);//设定字体颜色color = getRandColor(20, 130);g.setColor(color);//设定字体，每次随机g.setFont(RANDOM_FONT[RANDOM.nextInt(RANDOM_FONT.length)]);//将认证码显示到图象中g.drawString("" + buffer[i], x + 8, y + 10);//旋转之后，必须旋转回来g.rotate(-Math.toRadians(degree), x, y);}//图片中间曲线，使用上面缓存的colorg.setColor(color);//width是线宽,float型BasicStroke bs = new BasicStroke(3);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();}/*** 给定范围获得随机颜色** @param fc* @param bc* @return*/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);}}