【Java实现二维码生成】

Java实现二维码生成

废话不多说，直接上代码：

/**
 * 功能描述: 生成二维码 BufferedImage.
 *
 * @param content
 * @param qrWidth
 * @param qrHeight
 * @return java.awt.image.BufferedImage
 * @author longshao
 * @date 2019/5/31 9:13
 */

public static BufferedImage getBufferImage(String content, int qrWidth, int qrHeight) throws Exception {
    Hashtable hints = new Hashtable();
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);
    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
    hints.put(EncodeHintType.MARGIN, 0);
    BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrWidth, qrHeight, hints);
    int width = bitMatrix.getWidth();
    int height = bitMatrix.getHeight();
    BufferedImage image = new BufferedImage(qrWidth, qrHeight, 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);
        }
    }
    log.debug("执行生成二维码 BufferedImage操作");
    return image;
}

/**
 * 功能描述:  生成base64格式二维码.
 *
 * @param content  content
 * @param qrWidth  qrWidth
 * @param qrHeight qrHeight
 * @return string
 * @author longshao
 * @date 2019/5/31 9:18
 */
public static String getBase64(String content, int qrWidth, int qrHeight) {
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    try {
        BufferedImage image = getBufferImage(content, qrWidth, qrHeight);
        //转换成png格式的IO流
        ImageIO.write(image, "png", byteArrayOutputStream);
    } catch (Exception e) {
        e.printStackTrace();
    }
    byte[] bytes = byteArrayOutputStream.toByteArray();
    BASE64Encoder encoder = new BASE64Encoder();
    String base64 = encoder.encodeBuffer(bytes).trim();
    base64 = "data:image/png;base64," + base64;
    log.debug("执行生成base64格式二维码操作");
    return base64;
}