定制化二维码生成-优快云博客

本文链接：https://blog.youkuaiyun.com/m0_46199467/article/details/126247374

创建二维码

修改二维码颜色:createImage.color ===> int类型,黑色:0x00000000

以及一些其他的二维码生成等功能

   /**
     * 创建二维码
     * @param charSet 编码方式
     * @param content 二维码内容
     * @param qrWidth 二维码长度
     * @param qrHeight 二维码高度
     * @return
     */
    public static BufferedImage createImage(String charSet, String content, int qrWidth, int qrHeight,int color){
        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,hints); // 修改二维码底部高度
        } 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) ? color : 0xFFFFFFFF);
            }
        }
        return image;
    }

    /**
     * 对已经生成好的二维码设置logo
     * @param source 二维码
     * @param logo logo图片
     * @param logoWidth logo宽度
     * @param logoHeight logo高度
     */
    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();
    }

    /**
     * 缩小logo图片
     * @param logoPath
     * @param logoWidth
     * @param logoHeight
     * @return
     */
    public static Image compressLogo(String logoPath, int logoWidth, int logoHeight){
        File file = new File(logoPath);
        if (!file.exists()) {
            System.err.println("" + logoPath + "   该文件不存在！");
            return null;
        }
        Image original = null;
        try {
            original = ImageIO.read(new File(logoPath));
        } catch (IOException e) {
            e.printStackTrace();
        }
        int width = original.getWidth(null);
        int height = original.getHeight(null);
        if (width > logoWidth) {
            width = logoWidth;
        }
        if (height > logoHeight) {
            height = logoHeight;
        }
        Image image = original.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); // 绘制缩小后的图
        g.dispose();
        return image;
    }

    /**
     * 增加底部的说明文字
     * @param source 二维码
     * @param text 说明内容
     * @param step
     */
    public static BufferedImage addBottomFont(BufferedImage source, String text,int step) {

        int qrWidth = source.getWidth();
//        log.debug("二维码的宽度{}",qrWidth);
        int qrHeight = source.getHeight();
//        log.debug("二维码的高度{}",qrHeight);
        BufferedImage textImage = textToImage(text, qrWidth, 20,16);
        Graphics2D graph = source.createGraphics();
        //开启文字抗锯齿
        graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

    int width = textImage.getWidth(null);
    int height = textImage.getHeight(null);

    Image src = textImage;
    graph.drawImage(src, 0, qrHeight - (20 * step) - 10, width, height, null);
    graph.dispose();
    return  source;
}

/**
 * 将文明说明增加到二维码上
 * @param str
 * @param width
 * @param height
 * @param fontSize 字体大小
 * @return
 */
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();
    //开启文字抗锯齿
    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("微软雅黑", Font.BOLD, 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;
}

/**
 * 顶部增加说明文字
 * @param source
 * @param text
 */
public static void addUpFont(BufferedImage source, String text) {
    int qrWidth = source.getWidth();
    int qrHeight = source.getHeight();

    BufferedImage textImage = textToImage(text, qrWidth, 30,24);
    Graphics2D graph = source.createGraphics();
    //开启文字抗锯齿
    graph.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

    int width = textImage.getWidth(null);
    int height = textImage.getHeight(null);

    Image src = textImage;
    graph.drawImage(src, 0, 30, width, height, null);
    graph.dispose();
}

/**
 * 生成二维码图片
 * @param charSet 二维码编码方式
 * @param content 内容
 * @param qrWidth 宽度
 * @param qrHeight 长度
 * @param formatName jpg等图片格式
 * @param imgPath 二维码存放路径
 */
public static void encode(String charSet,String content,int qrWidth,int qrHeight,String formatName,String imgPath){
    BufferedImage image = QRCodeUtil.createImage(charSet,content,qrWidth,qrHeight,0xFF5ACF00);
    try {
        ImageIO.write(image, formatName, new File(imgPath));
    } catch (IOException e) {
        e.printStackTrace();
    }
}

/**
 * 生成二维码图片流
 * @param charSet 二维码编码方式
 * @param content 内容
 * @param qrWidth 宽度
 * @param qrHeight 长度
 * @return
 */
public static BufferedImage encode(String charSet,String content,int qrWidth,int qrHeight,int color) {
    BufferedImage image = QRCodeUtil.createImage(charSet,content,qrWidth,qrHeight,color);
    return image;
}

public static void encode( BufferedImage image,String formatName,String imgPath){
    try {

        ImageIO.write(image, formatName, new File(imgPath));
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public static void mkdirs(String destPath) {
    File file = new File(destPath);
    // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
    if (!file.exists() && !file.isDirectory()) {
        file.mkdirs();
    }
}

/*
 * 解析二维码
 */
public static String decode(File file,String 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);
    result = new MultiFormatReader().decode(bitmap, hints);
    String resultStr = result.getText();
    return resultStr;
}

/**
 *生成二维码base64
 * @param content
 * @return
 */
public static String getBase64EWM(String content,int color){
    int width = 300; // 二维码图片宽度
    int height = 300; // 二维码图片高度
    String format = "png";// 二维码的图片格式
    Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");	// 内容所使用字符集编码
    BufferedImage image =  QRCodeUtil.encode(format,content,width,height,color);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流
    try{
        ImageIO.write(image, "png", baos);//写入流中
    }catch(IOException e){
        e.printStackTrace();
    }
    byte[] bytes = baos.toByteArray();//转换成字节
    BASE64Encoder encoder = new BASE64Encoder();
    String png_base64 = encoder.encodeBuffer(bytes).trim();//转换成base64串
    png_base64 = "data:image/jpg;base64,"+png_base64.replaceAll("\n", "").replaceAll("\r", "");//删除 \r\n
    return png_base64;
}