Java实现二维码制作

二维码概述

二维码又称QR Code，QR全称Quick Response，是用某种特定的几何图形按一定规律在平面（二维方向上）分布的黑白相间的图形记录数据符号信息的。

zxing

1、引入pom文件

<!-- zxing -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.2.1</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.2.1</version>
</dependency>
           

2、生成和读取二维码

/**
 * 生成二维码
 */
public class CreateQrCode {

    public static void main(String[] args) {
        int width = ;
        int height = ;
        String format = "png";
        String content = "www.shuai.com";
        //定义二维码的参数
        HashMap map = new HashMap();
        //设置编码
        map.put(EncodeHintType.CHARACTER_SET, "utf-8");
        //设置纠错等级
        map.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        map.put(EncodeHintType.MARGIN, );

        try {
            //生成二维码
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height);
            Path file = new File("E:/develop/qrcode.png").toPath();
            MatrixToImageWriter.writeToPath(bitMatrix, format, file);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

/**
 * 读取二维码
 */
public class ReadQrCode {

    public static void main(String[] args) {
        try {
            MultiFormatReader multiFormatReader = new MultiFormatReader();
            File file = new File("E:/develop/qrcode.png");
            BufferedImage image = ImageIO.read(file);
            //定义二维码参数
            Map hints = new HashMap();
            hints.put(EncodeHintType.CHARACTER_SET,"utf-8");

            //获取读取二维码结果
            BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
            Result result = multiFormatReader.decode(binaryBitmap, hints);

            System.out.println("读取二维码： " + result.toString());
            System.out.println("二维码格式： " + result.getBarcodeFormat());
            System.out.println("二维码内容： " + result.getText());
        } catch (NotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
           

qrcodejar

1、引入qrcode的jar

2、生成二维码，解析二维码

/**
 * 二维码图片
 */
public class MyQrCodeImage implements QRCodeImage{
    BufferedImage bufferedImage;

    public MyQrCodeImage(BufferedImage bufferedImage) {
        this.bufferedImage = bufferedImage;
    }

    public int getHeight() {
        return bufferedImage.getHeight();
    }

    public int getPixel(int arg0, int arg1) {
        return bufferedImage.getRGB(arg0, arg1);
    }

    public int getWidth() {
        return bufferedImage.getWidth();
    }

}

/**
 * 生成二维码
 */
public class CreateQrCode {

    public static void main(String[] args) throws IOException {
        Qrcode x = new Qrcode();
        x.setQrcodeErrorCorrect('M');//设置纠错等级
        x.setQrcodeEncodeMode('B');//N代表数字，A代表a-Z，B代表其它字符
        x.setQrcodeVersion();//设置版本
        String qrData = "www.shuai.com";
        int width =  +  * ( - );
        int height =  +  * ( - );
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D gs = bufferedImage.createGraphics();
        //设置画笔
        gs.setBackground(Color.WHITE);
        gs.setColor(Color.BLACK);
        gs.clearRect(, , width, height);

        int pixoff = ;//偏移量

        byte[] d = qrData.getBytes("gbk");
        if (d.length >  && d.length < ) {
            boolean[][] s = x.calQrcode(d);
            for (int i = ; i < s.length; i++) {
                for (int j = ; j < s.length; j++) {
                    if (s[j][i]) {
                        //往画板中填充内容
                        gs.fillRect(j*+pixoff,i*+pixoff,,);
                    }
                }
            }
        }
        gs.dispose();
        bufferedImage.flush();
        ImageIO.write(bufferedImage, "png", new File("E:/develop/code.png"));
    }
}

/**
 * 读取二维码
 */
public class ReadQrCode {

    public static void main(String[] args) throws IOException {
        File file = new File("E:/develop/code.png");
        BufferedImage bufferedImage = ImageIO.read(file);
        Qrcode qrcode = new Qrcode();
        QRCodeDecoder codeDecoder = new QRCodeDecoder();
        String result = new String(codeDecoder.decode(new MyQrCodeImage(bufferedImage)),"GBK");
        System.out.println(result);
    }
}
           

jquery.qrcode.js

1、引入jquery.min.js、jquery.qrcode.min.js

2、页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>二维码</title>
<% 
    String path = request.getContextPath();
    String bathPath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort(); 
    pageContext.setAttribute("path", path);
    pageContext.setAttribute("bathPath", bathPath);
%>
<script type="text/javascript" src="${path }/js/jquery.min.js"></script>
<script type="text/javascript" src="${path }/js/jquery.qrcode.min.js"></script>
</head>
<body>
    生成的二维码： <br/>
    <div id="qrcode"></div>
    <script type="text/javascript">
        $('#qrcode').qrcode("www.shuai.cn");
    </script>
</body>

</html>