本文介紹了java數字和中文算數驗證碼的實現，分享給大家，具體如下：

效果圖

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

中文實現參考 https://gitee.com/whvse/EasyCaptcha.git

數字實現參考 https://www.jb51.net/article/190561.htm

代碼如下

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 { // 寬度 private static final int IMAGE_WIDTH = 160; // 高度 private static final int IMAGE_HEIGHT = 40; // 字體大小 private static final int FONT_SIZE = 28; // 干擾線數量 private static final int IMAGE_DISTURB_LINE_NUMBER = 15; // 后綴 private static final String SUFFIX = '等于？'; // 漢字數字 private static final String SOURCE = '零一二三四五六七八九十乘除加減'; // 計算類型 private static final Map<String, Integer> calcType = new HashMap<>(); private static final Random RANDOM = new Random(); static { // 對應SOURCE下標 calcType.put('*', 11); calcType.put('/', 12); calcType.put('+', 13); calcType.put('-', 14); } // 計算公式 private String content; // 計算結果 private int result; /** * 生成圖像驗證碼 */ public BufferedImage create() { createMathChar(); BufferedImage image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); // 字體顏色 g.setColor(Color.WHITE); // 背景顏色 g.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT); g.setColor(color()); // 圖片邊框 g.drawRect(0, 0, IMAGE_WIDTH - 1, IMAGE_HEIGHT - 1); g.setColor(color()); for (int i = 0; i < IMAGE_DISTURB_LINE_NUMBER; i++) { // 繪制干擾線 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以內數字 int xx = RANDOM.nextInt(10); int yy = RANDOM.nextInt(10); // 0~3 對應加減乘除 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不可為被除數 yy對xx取余無余數 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('數字計算公式 {}', this.content); } private void drawString(Graphics2D g2d, String s, int i) { g2d.setFont(new Font('黑體', 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); } // 獲取隨機顏色 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; }}

數字算法

此代碼使用了ttf字體 字體在此處 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 { // 寬度 private static final int IMAGE_WIDTH = 160; // 高度 private static final int IMAGE_HEIGHT = 40; // 字體大小 private static final int FONT_SIZE = 28; // 字體目錄 private static final String FONT_PATH = '/font/'; // 字體列表 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(); // 計算公式 private String content; // 計算結果 private int result; /** * 生成隨機驗證碼 */ private void createMathChar() { StringBuilder number = new StringBuilder(); int xx = RANDOM.nextInt(10); int yy = RANDOM.nextInt(10); // 0~3 對應加減乘除 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不可為被除數 yy對xx取余無余數 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(); } // 獲取隨機顏色 private Color color() { int r = RANDOM.nextInt(256); int g = RANDOM.nextInt(256); int b = RANDOM.nextInt(256); return new Color(r, g, b); } /** * 隨機畫干擾圓 * * @param num 數量 * @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; } /** * 生成驗證碼圖形 */ 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); // 抗鋸齒 g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // 畫干擾圓 drawOval(2, g2d); // 畫字符串 g2d.setFont(font()); FontMetrics fontMetrics = g2d.getFontMetrics(); // 每一個字符所占的寬度 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()); // 文字的縱坐標 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; }}

測試類

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) { // 圖片類型 String IMAGE_TYPE = 'png'; ChineseCaptcha chinese = new ChineseCaptcha(); NumberCaptcha number = new NumberCaptcha(); for (int i = 0; i < 10; i++) { BufferedImage image1 = chinese.create(); // 輸出文件 ImageIO.write(image1, IMAGE_TYPE, new File('D:/data/a' + i + '.png')); System.out.println(chinese.content() + ’ ’ + chinese.result()); BufferedImage image2 = number.create(); // 輸出文件 ImageIO.write(image2, IMAGE_TYPE, new File('D:/data/b' + i + '.png')); System.out.println(number.content() + ’ ’ + number.result()); } }}

如需要多級運算如1+2-3*4/5 則需要使用表達式引擎計算 如下為使用fel計算表達式

// fel計算表達式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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