spring boot:用zxing生成二维码,支持logo(spring boot 2.3.2)

时间：2021-11-20 20:17:26

一，zxing是什么？

1,zxing的用途

如果我们做二维码的生成和扫描，通常会用到zxing这个库，

ZXing是一个开源的，用Java实现的多种格式的1D/2D条码图像处理库。

zxing还可以实现使用手机的内置的摄像头完成条形码的扫描及解码

2,zxing官方项目地址:

https://github.com/zxing/zxing

说明：刘宏缔的架构森林是一个专注架构的博客，地址：https://www.cnblogs.com/architectforest

对应的源码可以访问这里获取： https://github.com/liuhongdi/

说明：作者:刘宏缔 邮箱: 371125307@qq.com

二，演示项目的相关信息

1，项目地址

https://github.com/liuhongdi/qrcode

2, 项目功能说明:

生成二维码直接展示

生成二维码保存成图片

解析二维码图片中的文字信息

3，项目结构，如图:

spring boot:用zxing生成二维码,支持logo(spring boot 2.3.2)

三，配置文件说明

1,pom.xml

        <!--qrcode begin-->

        <dependency>

            <groupId>com.google.zxing</groupId>

            <artifactId>core</artifactId>

            <version>3.4.0</version>

        </dependency>

        <dependency>

            <groupId>com.google.zxing</groupId>

            <artifactId>javase</artifactId>

            <version>3.4.0</version>

        </dependency>

        <!--qrcode   end-->

导入zxing库供生成qrcode使用

四，java代码说明

1,QrCodeUtil.java

/**

 * 二维码工具类

 * by liuhongdi

 */

public class QrCodeUtil {

    //编码格式,采用utf-8

    private static final String UNICODE = "utf-8";

    //图片格式

    private static final String FORMAT = "JPG";

    //二维码宽度像素pixels数量

    private static final int QRCODE_WIDTH = 300;

    //二维码高度像素pixels数量

    private static final int QRCODE_HEIGHT = 300;

    //LOGO宽度像素pixels数量

    private static final int LOGO_WIDTH = 100;

    //LOGO高度像素pixels数量

    private static final int LOGO_HEIGHT = 100;

    //生成二维码图片

    //content 二维码内容

    //logoPath logo图片地址

    private static BufferedImage createImage(String content, String logoPath) throws Exception {

        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();

        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

        hints.put(EncodeHintType.CHARACTER_SET, UNICODE);

        hints.put(EncodeHintType.MARGIN, 1);

        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,

                hints);

        int width = bitMatrix.getWidth();

        int height = bitMatrix.getHeight();

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        for (int x = 0; x < width; x++) {

            for (int y = 0; y < height; y++) {

                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);

            }

        }

        if (logoPath == null || "".equals(logoPath)) {

            return image;

        }

        // 插入图片

        QrCodeUtil.insertImage(image, logoPath);

        return image;

    }

    //在图片上插入LOGO

    //source 二维码图片内容

    //logoPath LOGO图片地址

    private static void insertImage(BufferedImage source, String logoPath) throws Exception {

        File file = new File(logoPath);

        if (!file.exists()) {

            throw new Exception("logo file not found.");

        }

        Image src = ImageIO.read(new File(logoPath));

        int width = src.getWidth(null);

        int height = src.getHeight(null);

            if (width > LOGO_WIDTH) {

                width = LOGO_WIDTH;

            }

            if (height > LOGO_HEIGHT) {

                height = LOGO_HEIGHT;

            }

            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);

            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

            Graphics g = tag.getGraphics();

            g.drawImage(image, 0, 0, null); // 绘制缩小后的图

            g.dispose();

            src = image;

        // 插入LOGO

        Graphics2D graph = source.createGraphics();

        int x = (QRCODE_WIDTH - width) / 2;

        int y = (QRCODE_HEIGHT - height) / 2;

        graph.drawImage(src, x, y, width, height, null);

        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

        graph.setStroke(new BasicStroke(3f));

        graph.draw(shape);

        graph.dispose();

    }

    //生成带logo的二维码图片，保存到指定的路径

    // content 二维码内容

    // logoPath logo图片地址

    // destPath 生成图片的存储路径

    public static String save(String content, String logoPath, String destPath) throws Exception {

        BufferedImage image = QrCodeUtil.createImage(content, logoPath);

        File file = new File(destPath);

        String path = file.getAbsolutePath();

        File filePath = new File(path);

        if (!filePath.exists() && !filePath.isDirectory()) {

            filePath.mkdirs();

        }

        String fileName = file.getName();

        fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length())

                + "." + FORMAT.toLowerCase();

        System.out.println("destPath:"+destPath);

        ImageIO.write(image, FORMAT, new File(destPath));

        return fileName;

    }

    //生成二维码图片，直接输出到OutputStream

    public static void encode(String content, String logoPath, OutputStream output)

            throws Exception {

        BufferedImage image = QrCodeUtil.createImage(content, logoPath);

        ImageIO.write(image, FORMAT, output);

    }

    //解析二维码图片，得到包含的内容

    public static String decode(String path) throws Exception {

        File file = new File(path);

        BufferedImage image = ImageIO.read(file);

        if (image == null) {

            return null;

        }

        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);

        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        Result result;

        Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();

        hints.put(DecodeHintType.CHARACTER_SET, UNICODE);

        result = new MultiFormatReader().decode(bitmap, hints);

        return result.getText();

    }

}

工具类，包含了生成二维码、保存二维码，展示二维码，解析二维码

2,HomeController.java

@RequestMapping("/home")

@Controller

public class HomeController {

    //生成带logo的二维码到response

    @RequestMapping("/qrcode")

    public void qrcode(HttpServletRequest request, HttpServletResponse response) {

        String requestUrl = "http://www.baidu.com";

        try {

            OutputStream os = response.getOutputStream();

            QrCodeUtil.encode(requestUrl, "/data/springboot2/logo.jpg", os);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    //生成不带logo的二维码到response

    @RequestMapping("/qrnologo")

    public void qrnologo(HttpServletRequest request, HttpServletResponse response) {

        String requestUrl = "http://www.baidu.com";

        try {

            OutputStream os = response.getOutputStream();

            QrCodeUtil.encode(requestUrl, null, os);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    //把二维码保存成文件

    @RequestMapping("/qrsave")

    @ResponseBody

    public String qrsave() {

        String requestUrl = "http://www.baidu.com";

        try {

            QrCodeUtil.save(requestUrl, "/data/springboot2/logo.jpg", "/data/springboot2/qrcode2.jpg");

        } catch (Exception e) {

            e.printStackTrace();

        }

        return "文件已保存";

    }

    //解析二维码中的文字

    @RequestMapping("/qrtext")

    @ResponseBody

    public String qrtext() {

        String url = "";

        try {

             url = QrCodeUtil.decode("/data/springboot2/qrcode2.jpg");

        } catch (Exception e) {

            e.printStackTrace();

        }

        return "解析到的url:"+url;

    }

}

入口处包含了四个方法，接下来我们做测试

五，测试效果

1,生成不带logo的二维码,访问:

http://127.0.0.1:8080/home/qrnologo

效果:

spring boot:用zxing生成二维码,支持logo(spring boot 2.3.2)

2,生成带logo的二维码:访问

http://127.0.0.1:8080/home/qrcode

效果：

spring boot:用zxing生成二维码,支持logo(spring boot 2.3.2)

3,生成二维码保存成文件：访问:

http://127.0.0.1:8080/home/qrsave

代码中文件被保存成了：/data/springboot2/qrcode2.jpg

4,解析二维码中包含的文字信息：访问:

http://127.0.0.1:8080/home/qrtext

返回：

解析到的url:http://www.baidu.com

成功解析到了图片中包含的url地址

六，查看spring boot版本

  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::        (v2.3.2.RELEASE)

相关文章