二維碼又稱QR Code，QR全稱Quick Response，是用某種特定的幾何圖形按一定規律在平面（二維方向上）分佈的黑白相間的圖形記錄資料符號資訊的。

zxing

1、引入pom檔案

<!-- 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>

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2、生成和讀取二維碼

/**
 * 生成二維碼
 */
public classCreateQrCode
 
 {

    public static void main(String[] args) {
        int width = 300;
        int height = 300;
        String format = "png";
        String content = "www.shuai.com";
        //定義二維碼的引數
        HashMap map = new HashMap();
        //設定編碼
        map.put(EncodeHintType.CHARACTER_SET, "utf-8");
        //設定糾錯等級
 

        map.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        map.put(EncodeHintType.MARGIN, 2);

        try {
            //生成二維碼
            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();
        }
    }
}

/**
 * 讀取二維碼
 */
public classReadQrCode {

    public static void main(String[] args) {
        try {
            MultiFormatReader multiFormatReader = new MultiFormatReader();
            File file = new File("E:/develop/qrcode.png");
            BufferedImage image = ImageIO.read(file);
            //定義二維碼引數
            Map hints = new HashMap();
            hints.put(EncodeHintType.CHARACTER_SET,"utf-8");

            //獲取讀取二維碼結果
            BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));
            Result result = multiFormatReader.decode(binaryBitmap, hints);

            System.out.println("讀取二維碼： " + result.toString());
            System.out.println("二維碼格式： " + result.getBarcodeFormat());
            System.out.println("二維碼內容： " + result.getText());
        } catch (NotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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qrcodejar

1、引入qrcode的jar 2、生成二維碼，解析二維碼

/**
 * 二維碼圖片
 */
public classMyQrCodeImageimplementsQRCodeImage{
    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();
    }

}

/**
 * 生成二維碼
 */
public classCreateQrCode {

    public static void main(String[] args) throws IOException {
        Qrcode x = new Qrcode();
        x.setQrcodeErrorCorrect('M');//設定糾錯等級
        x.setQrcodeEncodeMode('B');//N代表數字，A代表a-Z，B代表其它字元
        x.setQrcodeVersion(7);//設定版本
        String qrData = "www.shuai.com";
        int width = 67 + 12 * (7 - 1);
        int height = 67 + 12 * (7 - 1);
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D gs = bufferedImage.createGraphics();
        //設定畫筆
        gs.setBackground(Color.WHITE);
        gs.setColor(Color.BLACK);
        gs.clearRect(0, 0, width, height);

        int pixoff = 2;//偏移量

        byte[] d = qrData.getBytes("gbk");
        if (d.length > 0 && d.length < 120) {
            boolean[][] s = x.calQrcode(d);
            for (int i = 0; i < s.length; i++) {
                for (int j = 0; j < s.length; j++) {
                    if (s[j][i]) {
                        //往畫板中填充內容
                        gs.fillRect(j*3+pixoff,i*3+pixoff,3,3);
                    }
                }
            }
        }
        gs.dispose();
        bufferedImage.flush();
        ImageIO.write(bufferedImage, "png", new File("E:/develop/code.png"));
    }
}

/**
 * 讀取二維碼
 */
public classReadQrCode {

    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);
    }
}

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jquery.qrcode.js

1、引入jquery.min.js、jquery.qrcode.min.js 2、頁面

<%@ 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> 

<metahttp-equiv=“Content-Type”content=“text/html; charset=UTF-8”> 

<title>二維碼</title> 

<%  

    String path = request.getContextPath(); 

    String bathPath = request.getScheme() + “://” + request.getServerName() + “:” + request.getServerPort();  

    pageContext.setAttribute(“path”, path); 

    pageContext.setAttribute(“bathPath”, bathPath); 

%> 

<scripttype=“text/javascript”src=“${path }/js/jquery.min.js”></script> 

<scripttype=“text/javascript”src=“${path }/js/jquery.qrcode.min.js”></script> 

</head> 

<body> 

    生成的二維碼： <br/> 

    <divid=“qrcode”></div> 

    <scripttype=“text/javascript”> 

        $(’#qrcode’).qrcode(“www.shuai.cn”); 

    </script> 

</body>

</html>

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