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基于Java實(shí)現(xiàn)二維碼的生成和解析

更新時(shí)間：2022年08月22日 08:38:36 作者：java奧斯卡

二維碼其實(shí)就是一種編碼技術(shù)，只是這種編碼技術(shù)是用在圖片上了，將給定的一些文字，數(shù)字轉(zhuǎn)換為一張經(jīng)過特定編碼的圖片。本文將利用Java實(shí)現(xiàn)二維碼的生成和解析，需要的可以參考一下

最近因個(gè)人需求需要對(duì)根據(jù)內(nèi)容生成二維碼和進(jìn)行解析！記錄一下！二維碼其實(shí)就是一種編碼技術(shù)，只是這種編碼技術(shù)是用在圖片上了，將給定的一些文字，數(shù)字轉(zhuǎn)換為一張經(jīng)過特定編碼的圖片。這里利用的是 google 公司的 zxing使用方便，可以操作條形碼或者二維碼等

導(dǎo)入相關(guān)jar包

<!-- 二維碼 -->
		<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>3.3.3</version>
		</dependency>

二維碼工具類編

創(chuàng)建二維碼圖片

public static BufferedImage createImage(String charSet, String content, int qrWidth, int qrHeight) {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, charSet);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrWidth, qrHeight, // 修改二維碼底部高度
                    hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        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);
            }
        }
        return image;
    }

二維碼設(shè)置logo

public static void insertLogoImage(BufferedImage source, Image logo, int logoWidth, int logoHeight) {
        Graphics2D graph = source.createGraphics();
        int qrWidth = source.getWidth();
        int qrHeight = source.getHeight();
        int x = (qrWidth - logoWidth) / 2;
        int y = (qrHeight - logoHeight) / 2;
        graph.drawImage(logo, x, y, logoWidth, logoHeight, null);
        Shape shape = new RoundRectangle2D.Float(x, y, logoWidth, logoHeight, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

將文明說明增加到二維碼上

 public static BufferedImage textToImage(String str, int width, int height, int fontSize) {
        BufferedImage textImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = (Graphics2D) textImage.getGraphics();
        //開啟文字抗鋸齒
        g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2.setBackground(Color.WHITE);
        g2.clearRect(0, 0, width, height);
        g2.setPaint(Color.BLACK);
        FontRenderContext context = g2.getFontRenderContext();
        Font font = new Font("微軟雅黑", Font.PLAIN, fontSize);
        g2.setFont(font);
        LineMetrics lineMetrics = font.getLineMetrics(str, context);
        FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font);
        float offset = (width - fontMetrics.stringWidth(str)) / 2;
        float y = (height + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2;
        g2.drawString(str, (int) offset, (int) y);
        return textImage;
    }

解析二維碼

 /*
     * 解析二維碼
     */
    public static String decode(File file, DecodeHintType cherSet) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, cherSet);
        hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
        hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);

        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

main方法測(cè)試類

  public static void main(String[] args) {
        String content="用戶攝影作品版權(quán)信息";
        BufferedImage image = QRCodeUtil.createImage( "utf-8", content, 400, 400 );
        QRCodeUtil.addUpFont( image,"用戶攝影作品版權(quán)信息" );
        String formatName="png";
        String imagePath="D:\temp\java二維碼.png";
        File file=new File(imagePath);
        try {
            ImageIO.write(image, formatName, file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        String decode = null;
        try {
            decode = QRCodeUtil.decode(file, DecodeHintType.CHARACTER_SET);
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(decode);
        System.out.println("執(zhí)行完成");

    }

這樣就實(shí)現(xiàn)了！二維碼里面的內(nèi)容根據(jù)實(shí)際數(shù)據(jù)來就行！用手機(jī)掃描后查看。

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