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java 根据URL链接生成二维码中间添加logo

news 2025/5/7 3:25:42

要在 Java 中根据 URL 生成二维码并在二维码中间添加 logo，可以使用 ZXing 库来生成二维码，并使用图像处理库（如 Java 的 BufferedImage）来添加 logo。以下是详细的步骤和示例代码：
步骤
生成二维码：使用 ZXing 库生成二维码。
加载 logo 图片：加载需要添加到二维码中间的 logo 图片。
合并图片：将 logo 图片合并到二维码图片中。
示例代码
首先，确保你已经添加了 ZXing 库的依赖。如果你使用 Maven，可以在 pom.xml 文件中添加以下依赖：

<dependencies><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.4.1</version></dependency><dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.4.1</version></dependency>
</dependencies>

接下来是生成二维码并添加 logo 的完整示例代码：

package com.ruoyi.common.utils.file;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;/*** @author biypm* @version 1.0* @title* @date 2024/10/5/周六 10:24*/
public class QRCodeUtils {public static void main(String[] args) {String url = "https://www.baidu.com";int width = 300;int height = 300;String format = "png";String logoPath = System.getProperty("user.dir") + "src/assets/logo/logo.jpg"; // 你的 logo 图片路径try {BitMatrix bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, width, height, getHints());BufferedImage qrCodeImage = matrixToImage(bitMatrix);BufferedImage logoImage = ImageIO.read(new File(logoPath));BufferedImage finalImage = addLogoToQRCode(qrCodeImage, logoImage);ImageIO.write(finalImage, format, new File("qrcode_with_logo.png"));} catch (WriterException | IOException e) {e.printStackTrace();}}private static Map<EncodeHintType, ErrorCorrectionLevel> getHints() {Map<EncodeHintType, ErrorCorrectionLevel> hints = new HashMap<>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);return hints;}private static BufferedImage matrixToImage(BitMatrix matrix) {int width = matrix.getWidth();int height = matrix.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, matrix.get(x, y) ? Color.BLACK.getRGB() : Color.WHITE.getRGB());}}return image;}private static BufferedImage addLogoToQRCode(BufferedImage qrCodeImage, BufferedImage logoImage) {if (qrCodeImage == null || logoImage == null) {throw new IllegalArgumentException("qrCodeImage and logoImage must not be null");}int qrWidth = qrCodeImage.getWidth();int qrHeight = qrCodeImage.getHeight();// 减小Logo大小int newLogoWidth = qrWidth / 8;int newLogoHeight = qrHeight / 8;BufferedImage resizedLogo = new BufferedImage(newLogoWidth, newLogoHeight, BufferedImage.TYPE_INT_ARGB);Graphics2D g2 = resizedLogo.createGraphics();g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);g2.drawImage(logoImage, 0, 0, newLogoWidth, newLogoHeight, null);g2.dispose();// 创建最终的图像BufferedImage finalImage = new BufferedImage(qrWidth, qrHeight, BufferedImage.TYPE_INT_ARGB);Graphics2D g = finalImage.createGraphics();g.drawImage(qrCodeImage, 0, 0, null);// 计算Logo在二维码中的位置int x = (qrWidth - newLogoWidth) / 2;int y = (qrHeight - newLogoHeight) / 2;// 绘制Logo到二维码中心g.drawImage(resizedLogo, x, y, null);// 设置透明度g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.3f));  // 降低透明度// 绘制圆角矩形边框g.setColor(Color.WHITE);g.setStroke(new BasicStroke(3f));  // 减小边框宽度g.drawRoundRect(x, y, newLogoWidth, newLogoHeight, 15, 15);  // 减小圆角半径g.dispose();return finalImage;
}}