分享一个Java生成二维码工具类

直接上代码：

1、CodeUtil.class

package top.lrshuai.blog.util;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.util.Random;/** * 验证码工具类 * */public class CodeUtil {    private static final String[] CODE = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "P",            "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "1", "2", "3", "4", "5", "6", "7", "8", "9" };    /**     * 生成验证码图片     *      * @return obj[0]: 图片; obj[1]:字符串     */    public static Object[] CreateCode() {        int imgW = 120;        int imgH = 42;        int r, g, b;        Color color;        String result = "";        Random random = new Random();        BufferedImage img = new BufferedImage(imgW, imgH, BufferedImage.TYPE_INT_RGB);        Graphics2D graphics = img.createGraphics();        graphics.setFont(new Font("MicroSoft YaHei", Font.PLAIN, 30));        // 绘制背景色        r = random.nextInt(20) + 230;        g = random.nextInt(20) + 230;        b = random.nextInt(20) + 230;        color = new Color(r, g, b);        graphics.setColor(color);        graphics.fillRect(0, 0, imgW, imgH);        // 绘制背景干扰线条        for (int i = 0; i < 3; i++) {            r = random.nextInt(50) + 200;            g = random.nextInt(50) + 200;            b = random.nextInt(50) + 200;            color = new Color(r, g, b);            graphics.setColor(color);            graphics.setStroke(new BasicStroke(2.0f));            graphics.drawLine(random.nextInt(20), random.nextInt(imgH), random.nextInt(20) + 80, random.nextInt(imgH));        }        if (random.nextInt(100) >= 50) {            // 绘制字符串验证码            for (int i = 0; i < 4; i++) {                String str = CODE[random.nextInt(CODE.length)];                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                graphics.drawString(str, (i * 20) + 20, random.nextInt(4) + 30);                result += str;            }        } else {            // 绘制计算题验证码            int is = random.nextInt(100);            int num1 = 0, num2 = 0;            if (is >= 50) {                // 加法                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                num1 = random.nextInt(9) + 1;                graphics.drawString(num1 + "", 20, random.nextInt(4) + 30);                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                graphics.drawString("+", 40, random.nextInt(4) + 30);                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                num2 = random.nextInt(9) + 1;                graphics.drawString(num2 + "", 60, random.nextInt(4) + 30);                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                graphics.drawString("=", 80, random.nextInt(4) + 30);                result = (num1 + num2) + "";            } else {                // 乘法                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                num1 = random.nextInt(9) + 1;                graphics.drawString(num1 + "", 20, random.nextInt(4) + 30);                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                graphics.drawString("×", 40, random.nextInt(4) + 30);                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                num2 = random.nextInt(9) + 1;                graphics.drawString(num2 + "", 60, random.nextInt(4) + 30);                r = random.nextInt(180) + 50;                g = random.nextInt(180) + 50;                b = random.nextInt(180) + 50;                color = new Color(r, g, b);                graphics.setColor(color);                graphics.drawString("=", 80, random.nextInt(4) + 30);                result = (num1 * num2) + "";            }        }        // 绘制前景干扰线条        for (int i = 0; i < 3; i++) {            r = random.nextInt(50) + 200;            g = random.nextInt(50) + 200;            b = random.nextInt(50) + 200;            color = new Color(r, g, b);            graphics.setColor(color);            graphics.setStroke(new BasicStroke(1.0f));            graphics.drawLine(0, random.nextInt(imgH), imgW, random.nextInt(imgH));        }        return new Object[] { img, result };    }}

2、controller 请求

/*** 生成验证码* @throws IOException */@GetMapping(value = "/code")public String getCode(HttpServletResponse response){    OutputStream os = null;    try {        // 获取图片        Object[] img = CodeUtil.CreateCode();        System.out.println("code="+img[1].toString());        BufferedImage image = (BufferedImage) img[0];        // 输出到浏览器        response.setContentType("image/png");        os = response.getOutputStream();        ImageIO.write(image, "png", os);        os.flush();        // 用于验证的字符串存入session        this.getSession().setAttribute(Const.AUTH_CODE, img[1].toString());    } catch (IOException e) {        log.error("验证码输出异常",e);    }finally {        if(os != null) {            try {                os.close();            } catch (IOException e) {                System.out.println("close error");                e.printStackTrace();            }        }    }    return null;}

3、html 页面调用

<!DOCTYPE html><html><head>  <meta charset="utf-8">  <meta http-equiv="X-UA-Compatible" content="IE=edge">  <meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport"></head><body><img id="authCode" onclick="changeCode()" src="/code" alt="验证码" title="点击更换" /><script>function changeCode() {    document.getElementById("authCode").src = "/code?t=" + genTimestamp();}function genTimestamp() {    var time = new Date();    return time.getTime();}</script></body></html>

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