Java实现生成中间带图标的二维码

生成Base64格式的二维码，返回html渲染

package your.package;import com.google.zxing.*;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Base64;
import java.util.HashMap;public class QRCodeWithLogo {public static void main(String[] args) throws Exception {String webUrl = "https://www.alibaba.com"; // 目标网址String logoPath = "alipay_logo.png"; // Logo图片文件路径int qrCodeSize = 200; // 二维码尺寸设置为300x300像素int logoSize = 50; // 定义Logo的宽度，留白区域大小// 调用函数生成带留白无logo的二维码图像BufferedImage qrCodeImage = generateQRCodeImage(webUrl, qrCodeSize, qrCodeSize, logoSize);// 调用函数在二维码中心加入支付宝logoBufferedImage qrCodeWithLogo = addLogoToQRCode(qrCodeImage, logoPath);// 调用函数将带有logo的二维码图像转换为Base64字符串String base64Encoded = convertImageToBase64(qrCodeWithLogo);System.out.println(base64Encoded); // 输出二维码的Base64编码字符串}/*** 生成带有中部空白区（为Logo预留空间）的二维码图像。* @param data 要编码到二维码中的数据字符串* @param width 生成的二维码图像宽度* @param height 生成的二维码图像高度* @param logoSize 预留给logo的空白区域的宽度与高度（假设空白区域为正方形）* @return 中央带有空白区域的二维码图像* @throws Exception 如果生成二维码时遇到任何错误，则抛出异常*/private static BufferedImage generateQRCodeImage(String data, int width, int height, int logoSize) throws Exception {// 配置二维码生成参数HashMap<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // 指定二维码的编码设置为UTF-8hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 设置二维码的纠错级别为高(H)hints.put(EncodeHintType.MARGIN, 0); // 设置二维码边缘 空背空白（边框大小）为0// 根据数据与配置信息生成二维码的比特矩阵BitMatrix bitMatrix = new MultiFormatWriter().encode(data, BarcodeFormat.QR_CODE, width, height, hints);// 将二维码比特矩阵转换为BufferedImage图像，用于最终输出BufferedImage image = MatrixToImageWriter.toBufferedImage(bitMatrix);// 计算中部logo空白区域的坐标位置// 这确保了空间位于二维码的正中心int deltaHeight = image.getHeight() - logoSize;int deltaWidth = image.getWidth() - logoSize;int coordX = deltaWidth / 2;int coordY = deltaHeight / 2;// 采用图形对象在图像上绘图Graphics2D g2 = image.createGraphics();// 设置compositing 规则定为SRC，通过AlphaComposite指定透明度效果g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC));// 设置Logo区域的填充颜色为白色g2.setPaint(Color.WHITE);// 绘制一个填充过的矩形以形成预留给logo的空白区域g2.fillRect(coordX, coordY, logoSize, logoSize);g2.dispose(); // 结束图形编辑并释放系统资源return image; // 返回生成的二维码BufferedImage对象}/*** 将一个给定的logo图片添加到二维码中心** @param qrCodeImage 二维码的BufferedImage对象* @param logoPath logo图片的路径* @return 合成后的带有logo的二维码图片* @throws IOException 如果读取logo文件失败*/private static BufferedImage addLogoToQRCode(BufferedImage qrCodeImage, String logoPath) throws IOException {// 从文件中读取logo图片BufferedImage logoImage = ImageIO.read(new File(logoPath));// 确定logo的最终权重宽度和高度 - 通常将logo缩小到原来尺寸的1/5int logoWidth = logoImage.getWidth() / 5;int logoHeight = logoImage.getHeight() / 5;// 创建一个新的缓冲区图像，其中包含alpha值(透明度)用来画带边界的logoBufferedImage logoWithBorder = new BufferedImage(logoWidth, logoHeight, BufferedImage.TYPE_INT_ARGB);// 使用Graphics2D绘制带边界的logoGraphics2D gBorder = logoWithBorder.createGraphics();// 设置合成规则，表示后续绘图操作将直接替换背景像素gBorder.setComposite(AlphaComposite.Src);// 设置抗锯齿属性来平滑边缘gBorder.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);// 绘制一个填满整个logoWithBorder尺寸的白色矩形，形成logo的边界gBorder.setColor(Color.WHITE);gBorder.fillRect(0, 0, logoWidth, logoHeight);// 将logo图片缩放并绘制到logoWithBorder上gBorder.drawImage(logoImage.getScaledInstance(logoWidth, logoHeight, Image.SCALE_SMOOTH), 0, 0, null);// 不再进行绘制操作，释放此图形的上下文以及它使用的任何系统资源gBorder.dispose();// 计算二维码和logo的差距，用于将logo置于二维码的中心位置int deltaHeight = qrCodeImage.getHeight() - logoWithBorder.getHeight();int deltaWidth = qrCodeImage.getWidth() - logoWithBorder.getWidth();// 创建一个新的缓冲区图像以容纳原始的二维码和放置其中的logoBufferedImage combined = new BufferedImage(qrCodeImage.getHeight(), qrCodeImage.getWidth(), BufferedImage.TYPE_INT_ARGB);Graphics2D g = (Graphics2D) combined.getGraphics();// 将二维码绘制在新图片的最底层g.drawImage(qrCodeImage, 0, 0, null);// 设置合成效果来绘制logo，覆盖在之前绘制的内容之上g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));// 在合适的位置绘制带有白边背景框的logo（确保居中）g.drawImage(logoWithBorder, Math.round(deltaWidth / 2), Math.round(deltaHeight / 2), null);// 完成绘制，释放图形上下文使用的资源g.dispose();// 返回合成后带有logo的二维码图像return combined;}/*** 将图像转换成Base64编码的字符串* @param image* @return* @throws Exception*/private static String convertImageToBase64(BufferedImage image) throws Exception {ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); // 创建ByteArrayOutputStream对象ImageIO.write(image, "png", outputStream); // 把BufferedImage写入流中byte[] imageBytes = outputStream.toByteArray(); // 转换成对应的byte数组return Base64.getEncoder().encodeToString(imageBytes); // 进行Base64编码，并返回字符串}
}

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