本文介绍了java数字和中文算数验证码的实现，分享给大家，具体如下：

效果图

本文代码 https://gitee.com/tothis/java-record/tree/master/src/main/java/com/example/captcha

中文实现参考 https://gitee.com/whvse/EasyCaptcha.git

数字实现参考

代码如下

中文算法

package com.example.captcha;import lombok.extern.slf4j.Slf4j;import java.awt.*;import java.awt.image.BufferedImage;import java.util.HashMap;import java.util.Map;import java.util.Random;/** * @author 李磊 * @datetime 2020/7/9 20:10 * @description */@Slf4jpublic class ChineseCaptcha { // 宽度 private static final int IMAGE_WIDTH = 160; // 高度 private static final int IMAGE_HEIGHT = 40; // 字体大小 private static final int FONT_SIZE = 28; // 干扰线数量 private static final int IMAGE_DISTURB_LINE_NUMBER = 15; // 后缀 private static final String SUFFIX = "等于？"; // 汉字数字 private static final String SOURCE = "零一二三四五六七八九十乘除加减"; // 计算类型 private static final Map<String, Integer> calcType = new HashMap<>(); private static final Random RANDOM = new Random(); static { // 对应SOURCE下标 calcType.put("*", 11); calcType.put("/", 12); calcType.put("+", 13); calcType.put("-", 14); } // 计算公式 private String content; // 计算结果 private int result; /** * 生成图像验证码 */ public BufferedImage create() { createMathChar(); BufferedImage image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); // 字体颜色 g.setColor(Color.WHITE); // 背景颜色 g.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT); g.setColor(color()); // 图片边框 g.drawRect(0, 0, IMAGE_WIDTH - 1, IMAGE_HEIGHT - 1); g.setColor(color()); for (int i = 0; i < IMAGE_DISTURB_LINE_NUMBER; i++) { // 绘制干扰线 int x1 = RANDOM.nextInt(IMAGE_WIDTH); int y1 = RANDOM.nextInt(IMAGE_HEIGHT); int x2 = RANDOM.nextInt(13); int y2 = RANDOM.nextInt(15); g.drawLine(x1, y1, x1 + x2, y1 + y2); } StringBuilder builder = new StringBuilder(); for (int i = 0, j = content.length(); i < j; i++) { int index; if (i == 1) { index = calcType.get(String.valueOf(content.charAt(i))); } else { index = Integer.parseInt(String.valueOf(content.charAt(i))); } String ch = String.valueOf(SOURCE.charAt(index)); builder.append(ch); drawString((Graphics2D) g, ch, i); } drawString((Graphics2D) g, SUFFIX, 3); content = builder.append(SUFFIX).toString(); g.dispose(); return image; } private void createMathChar() { StringBuilder number = new StringBuilder(); // 10以内数字 int xx = RANDOM.nextInt(10); int yy = RANDOM.nextInt(10); // 0~3 对应加减乘除 int round = (int) Math.round(Math.random() * 3); if (round == 0) { this.result = yy + xx; number.append(yy); number.append("+"); number.append(xx); } else if (round == 1) { this.result = yy - xx; number.append(yy); number.append("-"); number.append(xx); } else if (round == 2) { this.result = yy * xx; number.append(yy); number.append("*"); number.append(xx); } else { // 0不可为被除数 yy对xx取余无余数 if (!(xx == 0) && yy % xx == 0) { this.result = yy / xx; number.append(yy); number.append("/"); number.append(xx); } else { this.result = yy + xx; number.append(yy); number.append("+"); number.append(xx); } } this.content = number.toString(); log.info("数字计算公式 {}", this.content); } private void drawString(Graphics2D g2d, String s, int i) { g2d.setFont(new Font("黑体", Font.BOLD, FONT_SIZE)); int r = RANDOM.nextInt(255); int g = RANDOM.nextInt(255); int b = RANDOM.nextInt(255); g2d.setColor(new Color(r, g, b)); int x = RANDOM.nextInt(3); int y = RANDOM.nextInt(2); g2d.translate(x, y); int angle = new Random().nextInt() % 15; g2d.rotate(angle * Math.PI / 180, 5 + i * 25, 20); g2d.drawString(s, 5 + i * 25, 30); g2d.rotate(-angle * Math.PI / 180, 5 + i * 25, 20); } // 获取随机颜色 private Color color() { int r = RANDOM.nextInt(256); int g = RANDOM.nextInt(256); int b = RANDOM.nextInt(256); return new Color(r, g, b); } public String content() { return content; } public int result() { return result; }}

数字算法

此代码使用了ttf字体 字体在此处 https://gitee.com/tothis/java-record/tree/master/src/main/resources/font

package com.example.captcha;import lombok.SneakyThrows;import java.awt.*;import java.awt.image.BufferedImage;import java.util.Random;/** * @author 李磊 * @datetime 2020/7/9 20:16 * @description */public class NumberCaptcha { // 宽度 private static final int IMAGE_WIDTH = 160; // 高度 private static final int IMAGE_HEIGHT = 40; // 字体大小 private static final int FONT_SIZE = 28; // 字体目录 private static final String FONT_PATH = "/font/"; // 字体列表 private static final String[] FONT_NAMES = { "actionj.ttf", "epilog.ttf", "headache.ttf" , "lexo.ttf", "prefix.ttf", "robot.ttf" }; private static final Random RANDOM = new Random(); // 计算公式 private String content; // 计算结果 private int result; /** * 生成随机验证码 */ private void createMathChar() { StringBuilder number = new StringBuilder(); int xx = RANDOM.nextInt(10); int yy = RANDOM.nextInt(10); // 0~3 对应加减乘除 int round = (int) Math.round(Math.random() * 3); if (round == 0) { this.result = yy + xx; number.append(yy); number.append("+"); number.append(xx); } else if (round == 1) { this.result = yy - xx; number.append(yy); number.append("-"); number.append(xx); } else if (round == 2) { this.result = yy * xx; number.append(yy); number.append("x"); number.append(xx); } else { // 0不可为被除数 yy对xx取余无余数 if (!(xx == 0) && yy % xx == 0) { this.result = yy / xx; number.append(yy); number.append("/"); number.append(xx); } else { this.result = yy + xx; number.append(yy); number.append("+"); number.append(xx); } } content = number.append("=?").toString(); } // 获取随机颜色 private Color color() { int r = RANDOM.nextInt(256); int g = RANDOM.nextInt(256); int b = RANDOM.nextInt(256); return new Color(r, g, b); } /** * 随机画干扰圆 * * @param num 数量 * @param g Graphics2D */ private void drawOval(int num, Graphics2D g) { for (int i = 0; i < num; i++) { g.setColor(color()); int j = 5 + RANDOM.nextInt(10); g.drawOval(RANDOM.nextInt(IMAGE_WIDTH - 25), RANDOM.nextInt(IMAGE_HEIGHT - 15), j, j); } } @SneakyThrows private Font font() { int index = RANDOM.nextInt(FONT_NAMES.length); Font font = Font.createFont(Font.TRUETYPE_FONT , getClass().getResourceAsStream(FONT_PATH + FONT_NAMES[index])) .deriveFont(Font.BOLD, FONT_SIZE); return font; } /** * 生成验证码图形 */ public BufferedImage create() { createMathChar(); char[] chars = content.toCharArray(); BufferedImage image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB); Graphics2D g2d = (Graphics2D) image.getGraphics(); // 填充背景 g2d.setColor(Color.WHITE); g2d.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT); // 抗锯齿 g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // 画干扰圆 drawOval(2, g2d); // 画字符串 g2d.setFont(font()); FontMetrics fontMetrics = g2d.getFontMetrics(); // 每一个字符所占的宽度 int fx = IMAGE_WIDTH / chars.length; // 字符左填充 int flp = 10; for (int i = 0; i < chars.length; i++) { String item = String.valueOf(chars[i]); g2d.setColor(color()); // 文字的纵坐标 int fy = IMAGE_HEIGHT - ((IMAGE_HEIGHT - (int) fontMetrics .getStringBounds(item, g2d).getHeight()) >> 1); g2d.drawString(item, flp + i * fx + 3, fy - 3); } g2d.dispose(); return image; } public String content() { return content; } public int result() { return result; }}

测试类

package com.example.captcha;import com.greenpineyu.fel.FelEngine;import com.greenpineyu.fel.FelEngineImpl;import lombok.SneakyThrows;import javax.imageio.ImageIO;import java.awt.image.BufferedImage;import java.io.File;/** * @author 李磊 * @datetime 2020/7/9 20:10 * @description */public class Main { @SneakyThrows public static void main(String[] args) { // 图片类型 String IMAGE_TYPE = "png"; ChineseCaptcha chinese = new ChineseCaptcha(); NumberCaptcha number = new NumberCaptcha(); for (int i = 0; i < 10; i++) { BufferedImage image1 = chinese.create(); // 输出文件 ImageIO.write(image1, IMAGE_TYPE, new File("D:/data/a" + i + ".png")); System.out.println(chinese.content() + ' ' + chinese.result()); BufferedImage image2 = number.create(); // 输出文件 ImageIO.write(image2, IMAGE_TYPE, new File("D:/data/b" + i + ".png")); System.out.println(number.content() + ' ' + number.result()); } }}

如需要多级运算如1+2-3*4/5 则需要使用表达式引擎计算 如下为使用fel计算表达式

// fel计算表达式FelEngine fel = new FelEngineImpl();System.out.println(3 * 2 + 1);System.out.println(fel.eval("3*2+1"));System.out.println(3 * (2 + 1));System.out.println(fel.eval("3*(2+1)"));

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