ZXing TWO-DIMENSIONAL code introduction

ZXing(Zebra Crossing) is a two-dimensional code parsing and generation open source library developed by Google. ZXing GitHub address import

        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.0</version>
        </dependency>


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public class QRCodeUtil {
    /** * Generate a QR code *@paramContent Source content *@paramOutputStream outputStream *@throws Exception
     */
    public static void createQRImage(String content, OutputStream outputStream) throws Exception {
        Hashtable hints = new Hashtable();
        // Specify the error correction level
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300.300,
                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); }}// Save to disk
        ImageIO.write(image, "jpg", outputStream);
        outputStream.flush();
        outputStream.close();
    }

    public static void createQRImage2(String content,OutputStream outputStream) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300.300,
                hints);
        // Generate a PNG image and save it to imgPath
        MatrixToImageWriter.writeToStream(bitMatrix, "jpg",outputStream);
        outputStream.flush();
        outputStream.close()
    }
    public static void createQRImage2(String content,File file) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300.300,
                hints);
        // Generate a PNG image and save it to imgPath
        MatrixToImageWriter.writeToFile(bitMatrix, "jpg",file);
    }
    public static void main(String[] args) throws Exception {
        String codeUrl = "http://www.baidu.com";
        // Use the order number as the image name of the QR code
        File file = new File("E:\\"."Test 3" + ".jpg");
        FileOutputStream out=newFileOutputStream(file); createQRImage(codeUrl, out); System.out.println(file.delete()); }}Copy the code

There are many kinds of bar codes, and two-dimensional (bar) codes are one of them. The content is also different, some can only represent pure numbers, can not represent letters.

BarcodeFormat.CODE_128; Barcodeformat.code_39; barcodeformat.code_39; BarcodeFormat.CODE_93; BarcodeFormat.CODABAR; // Barcodeformat. DATA_MATRIX; // Barcodeformat. DATA_MATRIX; // Barcodeformat. DATA_MATRIX; BarcodeFormat.EAN_8; BarcodeFormat.EAN_13; BarcodeFormat.ITF; BarcodeFormat.PDF417; // barcodeformat.qr_code; // barcodeformat.rss_expanded; BarcodeFormat.RSS14; BarcodeFormat.UPC_E; // Unified product code E:7 digits, the last digit is the check bit barcodeformat.upc_a; // universal product code A:12 digits, the last digit is the check bit barcodeformat.upc_ean_extension;Copy the code