spring boot整合谷歌zxing生成二維碼帶圖片

spring boot整合谷歌zxing生成二維碼帶圖片

剛寫完點擊驗證碼，又來數字驗證碼，現在再來個二維碼，前陣子被poi全家桶坑了，現在又來碼，不過谷歌還是牛皮，現成的直接拿來用。
引入依賴：

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.3</version>
</dependency>

創建一個工具類：

public class QRCodeUtil {
    
    //編碼格式,採用utf-8
    private static final String UNICODE = "utf-8";
    //圖片格式
    private static final String FORMAT = "JPG";
    //二維碼寬度,單位：像素pixels
    private static final int QRCODE_WIDTH = 300;
    //二維碼高度,單位：像素pixels
    private static final int QRCODE_HEIGHT = 300;
    //LOGO寬度,單位：像素pixels
    private static final int LOGO_WIDTH = 100;
    //LOGO高度,單位：像素pixels
    private static final int LOGO_HEIGHT = 100;

    /**
     * 生成二維碼圖片
     * @param content 二維碼內容
     * @param logoPath 圖片地址
     * @param needCompress 是否壓縮
     * @return
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, UNICODE);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,
                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);
            }
        }
        if (logoPath == null || "".equals(logoPath)) {
            return image;
        }
        // 插入圖片
        QRCodeUtil.insertImage(image, logoPath, needCompress);
        return image;
    }

    /**
     * 插入LOGO
     * @param source 二維碼圖片
     * @param logoPath LOGO圖片地址
     * @param needCompress 是否壓縮
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {
        File file = new File(logoPath);
        if (!file.exists()) {
            throw new Exception("logo file not found.");
        }
        Image src = ImageIO.read(new File(logoPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 壓縮LOGO
            if (width > LOGO_WIDTH) {
                width = LOGO_WIDTH;
            }
            if (height > LOGO_HEIGHT) {
                height = LOGO_HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 繪製縮小後的圖
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_WIDTH - width) / 2;
        int y = (QRCODE_HEIGHT - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 生成二維碼(內嵌LOGO)
     * 調用者指定二維碼文件名
     * @param content 二維碼的內容
     * @param logoPath 中間圖片地址
     * @param destPath 存儲路徑
     * @param fileName 文件名稱
     * @param needCompress 是否壓縮
     * @return
     * @throws Exception
     */
    public static String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
        mkdirs(destPath);
        //文件名稱通過傳遞
        fileName = fileName.substring(0, fileName.indexOf(".")>0?fileName.indexOf("."):fileName.length())
                + "." + FORMAT.toLowerCase();
        ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName));
        return fileName;
    }

    /**
     * 創建文件夾， mkdirs會自動創建多層目錄，區別於mkdir．(mkdir如果父目錄不存在則會拋出異常)
     * @param destPath
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

    /**
     * 解析二維碼
     * @param path 二維碼圖片路徑
     * @return String 二維碼內容
     * @throws Exception
     */
    public static String decode(String path) throws Exception {
        File file = new File(path);
        BufferedImage image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
        hints.put(DecodeHintType.CHARACTER_SET, UNICODE);
        result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();
    }
}

新建一個controller，寫一個接口創建：

隨便寫個頁面調用一下接口：

<img id="verification" src="/portal/base/qrcode" style="cursor: pointer;" title="看不清？換一張" />

注意：controller裏面的內容info，可以從前臺傳，也可以自己修改，自己喜歡就好