二维码生成方式有两种,一种是java,一种是js.其中js生成比较流行.下面先说java的生成方式:

(一)1. zxing生成方式:

地址:

int width = 300;　　//设置宽度int height = 300;　　//设置高度String format = "png";　　//图片的格式String content = "http://www.baidu.com";　　//图片内容// 定义二维码参数HashMap hm = new HashMap<>();hm.put(EncodeHintType.CHARACTER_SET, "utf-8");hm.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);hm.put(EncodeHintType.MARGIN, 2);try {BitMatrix bm = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, width, height,hm);Path file = new File("D:/img.png").toPath();MatrixToImageWriter.writeToPath(bm, format, file);} catch (Exception e) {e.printStackTrace();}

2.zxing解析方式:

MultiFormatReader formatReader=new MultiFormatReader();            File file=new File("D:/img.png");            BufferedImage image=ImageIO.read(file);            BinaryBitmap binaryBitmap=new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));            // 定义二维码参数            HashMap hm = new HashMap<>();            hm.put(EncodeHintType.CHARACTER_SET, "utf-8");            Result result=formatReader.decode(binaryBitmap,hm);            System.out.println("解析结果为:"+result);

(二)

1.QRCode生成方式:

生成:

读取:

 

Qrcode qrCode = new Qrcode();        qrCode.setQrcodeErrorCorrect('M');// 纠错等级        qrCode.setQrcodeEncodeMode('B');// N代表数字,A代表a-Z,B代表其他的字符        qrCode.setQrcodeVersion(7);// 版本        String str = "http://www.baidu.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();        gs.setBackground(Color.WHITE);        gs.setColor(Color.BLACK);        gs.clearRect(0, 0, width, height);        int pixoff = 2;// 偏移量        byte[] bytes = str.getBytes("gb2312");        if (bytes.length > 0 && bytes.length < 120) {            boolean[][] s = qrCode.calQrcode(bytes);            for (int i = 0; i < s.length; i++) {                for (int j = 0; j < s.length; j++) {                    if (s[j][i]) {                        gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);                    }                }            }        }        gs.dispose();        bufferedImage.flush();        ImageIO.write(bufferedImage, "png", new File("D:/imag1.png"));

2.QRCode解析方式:

public class Utils implements QRCodeImage{        BufferedImage bufferedImage;        public Utils(BufferedImage bufferedImage){        this.bufferedImage=bufferedImage;    }        @Override    public int getHeight() {                return bufferedImage.getHeight();    }    @Override    public int getPixel(int arg0, int arg1) {                return bufferedImage.getRGB(arg0, arg1);    }    @Override    public int getWidth() {                return bufferedImage.getWidth();    }}

File file =new File("D://imag1.png");        BufferedImage bufferedImage=ImageIO.read(file);        QRCodeDecoder codeDecoder=new QRCodeDecoder();        String result=new String(codeDecoder.decode(new Utils(bufferedImage)),"gb2312");                System.out.println(result);

(三)js生成:

地址:

How to Use ItLet me walk you thru it. First include it in your webpage with the usual script tagThen create a DOM element which gonna contains the generated qrcode image. Lets say a div
     
Then you add the qrcode in this container byjquery('#qrcode').qrcode("this plugin is great");This is it. see it live.You can set the height and width of the generated qrcode:jquery('#qrcode').qrcode({width: 64,height: 64,text: "size doesn't matter"});

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