一. 通過使用zxing方式實現： 
jar準備： https://github.com/zxing/zxing 下載原始碼，將core/src/main/Java/下的所有檔案和javase/src/main/java/下的所有檔案一起打成jar檔案zxing.jar

建立二維碼：

@SuppressWarnings({"rawtypes", "unchecked"})
    private static void createZxing() throws WriterException, IOException {
        int width=300;
        int hight=300;
        String format="png"
 
;
        String content="www.baidu.com";
        HashMap hints=new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);//糾錯等級L,M,Q,H
        hints.put(EncodeHintType.MARGIN, 2); //邊距
        BitMatrix bitMatrix=new
 
 MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, hight, hints);
        Path file=new File("D:/download/imag.png").toPath();
        MatrixToImageWriter.writeToPath(bitMatrix, format, file);
    }

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讀取二維碼：

private static void readZxing() throws IOException, NotFoundException {
        MultiFormatReader read = new
 
 MultiFormatReader();
        File file=new File("D:/download/imag.png");
        BufferedImage image=ImageIO.read(file);
        Binarizer binarizer=new HybridBinarizer(new BufferedImageLuminanceSource(image));
        BinaryBitmap binaryBitmap=new BinaryBitmap(binarizer);
        Result res=read.decode(binaryBitmap);
        System.out.println(res.toString());
        System.out.println(res.getBarcodeFormat());
        System.out.println(res.getText());
    }

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二. 使用QRCode方式實現二維碼

jar包準備：Qrcode_A.jar，qrcode_B.jar 
建立二維碼：

    private static void createORcode() throws UnsupportedEncodingException, IOException {
        Qrcode qrcode=new Qrcode();
        qrcode.setQrcodeErrorCorrect('M'); //糾錯等級L M Q H
        qrcode.setQrcodeEncodeMode('B'); //N:數字，A:a-Z ,B:其他字元
        int version = 7;
        qrcode.setQrcodeVersion(version);
        String qrData="www.baidu.com";
        byte data[]=qrData.getBytes("gb2312");
        int width = 67+12*(version-1);
        int hight=67+12*(version-1);
        BufferedImage bufferedImage=new BufferedImage(width, hight, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics2d=bufferedImage.createGraphics();
        graphics2d.setBackground(Color.white);
        graphics2d.setColor(Color.black);
        graphics2d.clearRect(0, 0, width, hight);
        int pixoff=2; //偏移量
        if (data.length>0 && data.length<120) {
            boolean[][] s=qrcode.calQrcode(data);
            for (int i = 0; i < s.length; i++) {
                for (int j = 0; j < s.length; j++) {
                    if (s[j][i]) {
                        graphics2d.fillRect(j*3+pixoff, i*3+pixoff, 3, 3);
                    }
                }
            }
        }
        graphics2d.dispose();
        bufferedImage.flush();
        ImageIO.write(bufferedImage, "png", new File("D:/download/imag.png"));
    }

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讀取二維碼：兩種方式：1.上訴readZxing()的方式，2.如下

   private static void readQRcode() throws IOException, NotFoundException {
        File file=new File("D:/download/imag.png");
        BufferedImage bufferedImage=ImageIO.read(file);
        QRCodeDecoder codeDecoder=new QRCodeDecoder();
        String res=new String(codeDecoder.decode(new MyQRCodeImage(bufferedImage)),"gb2312");
        System.out.println(res);
    }

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三. 使用js外掛實現二維碼

js檔案準備：jQuery.min.js，jquery.qrcode.min.js 
匯入js檔案，然後編寫如下程式碼，訪問該頁面。

    <div id="qrcode"></div>
    <script type="text/javascript">
        $("#qrcode").qrcode("www.baidu.com");
    </script>